105 results on '"Hafalia, A. R."'
Search Results
2. Performance of HQ02, an optimized version of the 120 mm $Nb_3Sn$ LARP quadrupole
- Author
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Chlachidze, G, Ambrosio, G, Anerella, M, Borgnolutti, F, Bossert, R, Caspi, S, Cheng, D W, Dietderich, D, Felice, H, Ferracin, P, Ghosh, A, Godeke, A, Hafalia A R, Marchevsky, M, Orris, D, Roy, P K, Sabbi, G L, Salmi, T, Schmalzle, J, Sylvester, C, Tartaglia, M, Tompkins, J, Wanderer, P, Wang, X R, and Zlobin, A V
- Subjects
Physics::Accelerator Physics ,Accelerators and Storage Rings - Abstract
In preparation for the high luminosity upgrade of the Large Hadron Collider (LHC), the LHC Accelerator Research Program (LARP) is developing a new generation of large aperture high-field quadrupoles based on Nb$_{3}$Sn technology. One meter long and 120 mm diameter HQ quadrupoles are currently produced as a step toward the eventual aperture of 150 mm. Tests of the first series of HQ coils revealed the necessity for further optimization of the coil design and fabrication process. A new model (HQ02) has been fabricated with several design modifications, including a reduction of the cable size and an improved insulation scheme. Coils in this magnet are made of a cored cable using 0.778 mm diameter Nb$_{3}$Sn strands of RRP 108/127 sub-element design. The HQ02 magnet has been fabricated at LBNL and BNL, and then tested at Fermilab. This paper summarizes the performance of HQ02 at 4.5 K and 1.9 K temperatures. In preparation for the high luminosity upgrade of the Large Hadron Collider (LHC), the LHC Accelerator Research Program (LARP) is developing a new generation of large aperture high-field quadrupoles based on Nb_3Sn technology. One meter long and 120 mm diameter HQ quadrupoles are currently produced as a step toward the eventual aperture of 150 mm. Tests of the first series of HQ coils revealed the necessity for further optimization of the coil design and fabrication process. A new model (HQ02) has been fabricated with several design modifications, including a reduction of the cable size and an improved insulation scheme. Coils in this magnet are made of a cored cable using 0.778 mm diameter Nb_3Sn strands of RRP 108/127 subelement design. The HQ02 magnet has been fabricated at LBNL and BNL, and then tested at Fermilab. This paper summarizes the performance of HQ02 at 4.5 K and 1.9 K temperatures.
- Published
- 2014
3. Test of Optimized 120-mm LARP $Nb_{3}S_n$ Quadrupole Coil Using Magnetic Mirror Structure
- Author
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Chlachidze, G, Ambrosio, G, Andreev, N, Anerella, M, Barzi, E, Bossert, R, Caspi, S, Cheng, D, Dietderich, D, Felice, H, Ferracin, P, Ghosh, A, Godeke, A, Hafalia, A R, Kashikhin, V V, Lamm, M, Marchevsky, M, Nobrega, A, Novitski, I, Orris, D, Sabbi, G L, Schmalzle, J, Wanderer, P, and Zlobin, A V
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Quantitative Biology::Biomolecules ,Accelerators and Storage Rings - Abstract
The US LHC accelerator research program (LARP) is developing a new generation of large - aperture high - field quadrupoles based on Nb 3 Sn conductor for the High luminosity upgrade of Large Hadron Collider (HiLumi - LHC). Tests of the first series of 120 - mm aperture HQ coils revealed the necessity for further optimization of the coil design and fabrication process. Modifications in coil design were gradually implemented in two HQ coils previously tested at Fermi National Accelerato r Laboratory (Fermilab) using a magnetic mirror structure (HQM01 and HQM02). This paper describes the construction and test of an HQ mirror model with a coil of optimized design and with an interlayer resistive core in the conductor. The cable for this co il was made of a smaller diameter strand, providing more room for coil expansion during reaction. The 0.8 - mm strand, used in all previous HQ coils was replaced with a 0.778 - mm Nb 3 Sn strand of RRP 108/127 sub - element design. The coil was instrumented with voltage taps, heaters, and strain gauges to monitor mechanical and thermal properties and quench performance of the coil.
- Published
- 2013
4. Summary of Test Results of MQXFS1--The First Short Model 150 mm Aperture Nb3Sn Quadrupole for the High-Luminosity LHC Upgrade.
- Author
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Stoynev, Stoyan, Ambrosio, Giorgio, Anerella, Michael, Bossert, Rodger, Cavanna, Eugenio, Cheng, Daniel, Dietderich, Daniel, DiMarco, Joseph, Felice, Helene, Ferracin, Paolo, Chlachidze, Guram, Ghosh, Arup, Grosclaude, Philippe, Guinchard, Michael, Hafalia, A. R., Holik, Eddie Frank, Bermudez, Susana Izquierdo, Krave, Steven, Marchevsky, Maxim, and Nobrega, Alfred
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MAGNETS ,QUADRUPOLES ,LUMINOSITY ,HOLES ,MAGNETISM - Abstract
The development of Nb3Sn quadrupole magnets for the High-Luminosity LHC upgrade is a joint venture between the US LHC Accelerator Research Program (LARP)
1 and CERN with the goal of fabricating large aperture quadrupoles for the LHC interaction regions (IR). The inner triplet (low-β) NbTi quadrupoles in the IR will be replaced by the stronger Nb3 Sn magnets boosting the LHC program of having 10-fold increase in integrated luminosity after the foreseen upgrades. Previously, LARP conducted successful tests of short and long models with up to 120 mm aperture. The first short 150mmaperture quadrupole modelMQXFS1 was assembled with coils fabricated by both CERN and LARP. The magnet demonstrated a strong performance at Fermilab's vertical magnet test facility reaching the LHC operating limits. This paper reports the latest results from MQXFS1 tests with changed pre stress levels. The overall magnet performance, including quench training and memory, ramp rate, and temperature dependence, is also summarized. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
5. Progress in the long $Nb_3Sn$ quadrupole R&D by LARP
- Author
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Ambrosio, G, Andreev, N, Anerella, M, Barzi, E, Bocian, D, Bossert, r, Buehler, M, Caspi, S, Chlachidze, G, Dietderich, D, DiMarco, J, Escallier, J, Felice, H, Ferracin, P, Ghosh, A, Godeke, A, Hafalia, A R, Hannaford, R, Jochen, G, Kim, M J, Kovach, P, Lamm, M, Marchevsky, M, McInturff, A, Nobrega, A, Orris, D, Prebys, E, Prestemon, G I, Sabbi, G L, Schmalzle, J, Sylvester, C, Tartaglia, M, Turroni, D, Velev, G, Wanderer, P, Whitson, G, and Zlobin, A V
- Subjects
Accelerators and Storage Rings - Abstract
After the successful test of the first long quadrupole (LQS01) the US LHC Accelerator Research Program (LARP, a collaboration of BNL, FNAL, LBNL and SLAC) is assessing training memory, reproducibility, and other accelerator quality features of long quadrupole magnets. LQS01b (a reassembly of LQS01 with more uniform and higher pre-stress) was subjected to a full thermal cycle and reached the previous plateau of 222 T/m at 4.5 K in two quenches. A new set of four coils, made of the same type of conductor used in LQS01 (RRP 54/61 by Oxford Superconducting Technology), was assembled in the LQS01 structure and tested at 4.5 K and lower temperatures. The new magnet (LQS02) reached the target gradient (200 T/m) only at 2.6 K and lower temperatures, at inter- mediate ramp rates. The preliminary test analysis, here reported, showed a higher instability in the limiting coil than in the other coils of LQS01 and LQS02.
- Published
- 2012
6. Test Results of a Nb3Sn Wind/React 'Stress-Managed' Block Dipole
- Author
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McInturff, A., Bish, P., Blackburn, R., Diaczenko, N., Elliott, T., Hafalia Jr., R., Henchel, W., Jaisle, A., Lau, W., Lietzke, A., McIntyre, P., Noyes, P., Nyman, M., and Sattarov, A.
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superconducting accelerator magnets Nb3Sn stress controlwind/react ,Physics - Abstract
A second phase of a high field dipole technology development has been tested. A Nb3Sn block-coil model dipole was fabricated, using magnetic mirror geometry and wind/react coil technology. The primary objective of this phase was to make a first experimental test of the stress-management strategy pioneered at Texas A&M. In this strategy a high-strength support matrix is integrated with the windings to intercept Lorentz stress from the inner winding so that it does not accumulate in the outer winding. The magnet attained a field that was consistent with short sample limit on the first quench; there was no training. The decoupling of Lorentz stress between inner and outer windings was validated. In ramp rate studies the magnet exhibited a remarkable robustness in rapid ramping operation. It reached 85 percent of short sample(ss) current even while ramping 2-3 T/s. This robustness is attributed to the orientation of the Rutherford cables parallel to the field in the windings, instead of the transverse orientation that characterizes common dipole designs. Test results are presented and the next development phase plans are discussed.
- Published
- 2006
7. Development of TQC01, a 90-mm Nb$_3$Sn model quadrupole for LHC upgrade based on SS collar
- Author
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Bossert, R C, Ambrosio, G, Andreev, N, Barzi, E, Caspi, S, Dietderich, D R, Ferracin, P, Ghosh, A, Gourlay, S A, Hafalia, A R, Hannaford, C R, Kashikhin, V S, Kashikhin, V V, Lietzke, A F, Mattafirri, S, McInturff, A D, Novitsky, I, Sabbi, G L, Turrioni, D, Whitson, G, Yamada, R, and Zlobin, A V
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Physics::Instrumentation and Detectors ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Accelerators and Storage Rings - Abstract
As a first step toward the development of a large-aperture Nb$_3$Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer technological quadrupole models (TQS01 at LBNL and TQC01 at Fermilab) are being constructed within the framework of the US LHC Accelerator Research Program (LARP). Both models use the same coil design, but have different coil support structures. This paper describes the TQC01 design, fabrication technology and summarizes its main parameters.
- Published
- 2006
8. Mechanical analysis of the Nb3Sn dipole magnet HD1
- Author
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Ferracin, Paolo, Bartlett, Scott E., Caspi, Shlomo, Dietderich, Daniel R., Gourlay, Steve A., Hannaford, Carles R., Hafalia, Aurelio R., Lietzke, Alan F., Mattafirri, Sara, and Sabbi, Gianluca
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Physics - Published
- 2005
9. Development of a large aperture Nb3Sn racetrack quadrupole magnet
- Author
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Ferracin, Paolo, Bartlett, Scott E., Caspi, Shlomo, Dietderich, Daniel R., Gourlay, Steven A., Hannaford, Charles R., Hafalia, Aurelio R., Lietzke, Alan F., Mattafirri, Sara, McInturff, Alfred D., Nyman, Mark, and Sabbi, Gianluca
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Physics - Published
- 2005
10. Design of HD2: A 14-Tesla Nb$_3$Sn dipole with a 35-mm bore
- Author
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Bartlett, S E, Caspi, S, Dietderich, D R, Ferracin, P, Gourlay, S A, Hafalia, A R, Hannaford, C R, Lietzke, A F, Mattafirri, S, McInturff, A D, and Sabbi, G L
- Subjects
Accelerators and Storage Rings - Abstract
The Nb$_3$Sn dipole HD1, recently fabricated and tested at LBNL, pushes the limits of accelerator magnet technology into the 16 T field range, and opens the way to a new generation of HEP colliders. HD1 is based on a flat racetrack coil configuration and has a 10 mm bore. These features are consistent with the HD1 goals: exploring the Nb/sub 3/Sn conductor performance limits at the maximum fields and under high stress. However, in order to further develop the block-coil geometry for future high-field accelerators, the bore size has to be increased to 30-50 mm. With respect to HD1, the main R&D; challenges are: (a) design of the coil ends, to allow a magnetically efficient cross-section without obstructing the beam path; (b) design of the bore, to support the coil against the pre-load force; (c) correction of the geometric field errors. HD2 represents a first step in addressing these issues, with a central dipole field above 15 T, a 35 mm bore, and nominal field harmonics within a fraction of one unit. This paper describes the HD2 magnet design concept and its main features, as well as further steps required to develop a cost-effective block-coil design for future high-field, accelerator-quality dipoles.
- Published
- 2005
11. Fabrication and performance of Nb$_{3}$Sn Rutherford-type cable with Cu added as a separate component
- Author
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Coccoli, M, Scanlan, R M, Calvi, M, Caspi, S, Chiesa, L, Hafalia, R R, Higley, H C, Dietderich, D R, Gourlay, S A, Lietzke, A F, McInturff, A D, and Sabbi, G L
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Quantitative Biology::Biomolecules ,Quantitative Biology::Neurons and Cognition ,Accelerators and Storage Rings - Abstract
From the standpoint of overall conductor cost, it is desirable to minimize the amount of Cu that is co-processed with the superconductor during strand fabrication. We are investigating several approaches for fabricating multistrand cables in which the Cu is added at the final, i.e. cabling, stage of manufacture. These include mixed strand Rutherford-type cables with pure Cu strands cabled together with superconductor strands that have a low volume fraction of Cu, Cu added as a core to a Rutherford-type cable, and Cu strip added to the surface of the cable. Results on fabrication of several alternate types of Nb$_{3}$Sn cables are presented. The more promising types of mixed strand and cored cables are being evaluated in short sample and small magnet tests. These results will be presented and the performance will be compared with conventional Rutherford cables where the Cu is an integral component of the superconductor strand.
- Published
- 2004
12. Fabrication and Test Results of a High Field, Nb$_{3}$Sn Superconducting Racetrack Dipole Magnet
- Author
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Gourlay, S A, Benjegerdes, R, Bish, P A, Byford, D, Caspi, S, Dietderich, D R, Hafalia, R R, Hannaford, R, Higley, H C, Jackson, A, Lietzke, A F, Liggins, N, McInturff, A D, O'Neill, J, Palmerston, E, Sabbi, G L, Scanlan, R M, and Swanson, J
- Subjects
Accelerators and Storage Rings - Published
- 2001
13. Characterization of Insulating Coatings for Wind-and-React Coil Fabrication.
- Author
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Cheng, D. W., Dietderich, D. R., Godeke, A., Hafalia, A. R., Marchevsky, M., Prestemon, S. O., Roy, P. K., Sabbi, G., and Swenson, C. A.
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SURFACE coatings ,TORROIDAL coils ,ELECTRIC insulators & insulation ,BREAKDOWN voltage ,LOW temperature engineering ,NIOBIUM compounds ,MICROFABRICATION ,ELECTRICAL conductors - Abstract
Electrical insulation breakdown between conductor and coil parts and structures is a limiting factor in the performance of high-field magnets. We have evaluated various insulation coatings for possible application in both Nb3Sn and Bi-2212 coil fabrication. Such coatings must be robust to maintain structural integrity and provide adequate voltage standoff after the wind-and-react coil fabrication process. Such processes are characterized by reaction temperatures of 650°C in an inert atmosphere for Nb3Sn and 890°C in a pure oxygen atmosphere for Bi-2212, and down to cryogenic temperatures when coils are in service. We present a method of testing standardized samples and report the performance characteristics of oxide layers produced (or applied) by plasma-spray, surface conversion, and "paintable" coatings in common areas of voltage breakdown in coil parts. We also address material compatibility and durability during hightemperature heat treatment and cryogenic shock. Suitable coatings selected in the testing process will be instrumental in improving the performance of future wind-and-react coils. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
14. Novel methods for the measurement of the critical current of superconducting wires.
- Author
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Godeke, A., Bish, P., Dietderich, D. R., Gorham, C. S., Hafalia, A. R., Higley, H. C., Liggins, N. L., Mentink, M. G. T., and Sabbi, G. L.
- Subjects
WIRE ,CRITICAL current measurement ,SUPERCONDUCTING wire ,MAGNETIC fields ,ELECTRIC potential measurement ,ELECTRIC currents - Abstract
The critical current as a function of magnetic field of superconducting wires is commonly measured using about 60 mm short straight, or U-shaped samples, or about 1 m long samples on helical mandrels (so-called ITER barrels). The ITER barrel is designed for low to medium currents, but is commonly modified for high current wires. This often results in increased complexity, errors from reacted sample handling, preparation time, and cost. We have developed a method that retains the standard ITER barrel, but uses disposable, off the-shelf, plumbers, Cu tube fittings instead of machined end-rings, thereby resolving the aforementioned issues. The improved sample holder also solves a number of disadvantages of the original ITER barrel method. A second method involves the improvement of straight wire measurements. Current redistributions, resulting from the limited length in perpendicular magnetic field, reduce the achievable voltage resolution in short straight, or U-shaped samples. We have introduced "wiggles" in U-shaped short samples, which impose the appropriate current distribution far before the region of interest, thereby mitigating undesired redistributions around the voltage measurement region. Both improved methods allow for an increased throughput and reliability of critical current measurements on superconducting wires. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
15. Test of the High-Field \Nb3\Sn Dipole Magnet HD3b.
- Author
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Marchevsky, M., Caspi, S., Cheng, D. W., Dietderich, D. R., DiMarco, J., Felice, H., Ferracin, P., Godeke, A., Hafalia, A. R., Joseph, J., Lizarazo, J., Roy, P. K., Sabbi, G., Salmi, T., Turqueti, M., Wang, X., and Prestemon, S.
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MAGNETIC dipoles ,MAGNETS ,ELECTRIC insulators & insulation ,THERMOCYCLING ,ACOUSTIC emission - Abstract
We report test results for the one meter long dipole HD3b, a block-type accelerator quality \Nb3\Sn magnet built at LBNL with operational bore fields in the range of 13–15 T. The magnet is an upgrade of the previously reported HD2 and HD3a versions, with several modifications implemented to improve conductor positioning, reduce cable “hard-way” bending radius, and strengthen electrical insulation between cables and coil parts. The magnet exhibited long training behavior, but showed a good “memory” of the trained state upon thermal cycling. Ramp-rate dependence of the quench current, field quality performance characteristics, and protection heater studies were conducted. Quench propagation velocity and quench locations were determined based on the voltage signals; quench localization was further improved using inductive quench antenna and acoustic emission sensors. Short- and long-term acoustic precursors to quenching were observed. [ABSTRACT FROM PUBLISHER]
- Published
- 2014
- Full Text
- View/download PDF
16. Fabrication of a Second-Generation of \Nb3 \Sn Coils for the LARP HQ02 Quadrupole Magnet.
- Author
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Borgnolutti, F., Ambrosio, G., Bossert, R., Chlachidze, G., Cheng, D. W., Dietderich, D. R., Felice, H., Godeke, A., Hafalia, A. R., Marchevsky, M., Roy, P. K., Sabbi, G. L., Schmalzle, J., Wanderer, P., and Yu, M.
- Subjects
LUMINOSITY ,MAGNETS ,SUPERCONDUCTING magnets ,MAGNETISM ,BIOMAGNETISM - Abstract
In the framework of the Large Hadron Collider Luminosity upgrade (HiLumi-LHC) project, the US LHC accelerator research program is developing high-gradient, large-aperture \Nb3 \Sn quadrupole magnets for the LHC interaction regions. The fabrication and tests of a first series of 120-mm-aperture “HQ01” coils revealed design issues that resulted in limited performance. A second series of coils was fabricated in which a number of improved features were implemented (HQ02 coils). The improvements were partly validated with the successful test of an HQ02 coil in a mirror structure, which reached 97% of the short sample. Here, we review the modifications in the coil design and the coil fabrication process, report the issues met during the fabrication, give details of the few differences that exist within the set of HQ02 coils, and discuss a list of further improvements that will be implemented in a third series of HQ coils. [ABSTRACT FROM PUBLISHER]
- Published
- 2014
- Full Text
- View/download PDF
17. Quench Performance of HQ01, a 120 mm Bore LARP Quadrupole for the LHC Upgrade.
- Author
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Marchevsky, M., Ambrosio, G., Bingham, B., Bossert, R., Caspi, S., Cheng, D. W., Chlachidze, G., Dietderich, D., DiMarco, J., Felice, H., Ferracin, P., Ghosh, A., Hafalia, A. R., Joseph, J., Lizarazo, J., Sabbi, G. L., Schmalzle, J., Wanderer, P., Wang, X., and Zlobin, A. V.
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ELECTRIC insulators & insulation ,QUADRUPOLES ,ELECTRIC coils ,SUPERCONDUCTING magnets ,ACCELERATOR magnets ,NIOBIUM ,TIN - Abstract
We report quench test results for the 1-meter long, 120 mm aperture Nb3Sn quadrupole magnet, HQ01, designed, fabricated and tested for the LHC Accelerator Research Program (LARP). The magnet has a design gradient of 219 T/m at 1.9 K and peak field of \sim15 T. Earlier tests (HQ01a, b) showed peak gradients of 152 T/m at 4.4 K but also revealed electrical insulation weaknesses that ultimately led to coil damage. Structural and electrical improvements incorporated into HQ01c magnet have assured and tracked the electrical integrity of the coils. The most recent HQ01d and HQ01e tests demonstrated gradients of 170 T/m at 4.4 K (86% of short sample critical current) with moderate training. By analyzing magnet voltage test data, quench propagation velocities and quench locations were determined. Most of the quenches tended to cluster around the pole region of the coils. Eight PC-board quench antennas were installed to better identify quench locations. We monitored longitudinal propagation of pole-turn quenches and correlated inductive responses of the quench antennas with magnet voltages. On down-ramps, the HQ magnet exhibited no quenches at rates up 150 A/s; the experimental ramp-rate dependence was analyzed using a simple ‘loss model’. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
18. Impact of Coil Compaction on \ Nb3{\ {Sn}} LARP HQ Magnet.
- Author
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Felice, H., Ambrosio, G., Anerella, M. D., Bocian, D., Bossert, R., Caspi, S., Collins, B., Cheng, D., Chlachidze, G., Dietderich, D. R., Ferracin, P., Godeke, A., Ghosh, A., Hafalia, A. R., Joseph, J. M., Krishnan, J., Marchevsky, M., Sabbi, G., Schmalzle, J., and Wanderer, P.
- Subjects
ELECTRIC coils ,LARGE Hadron Collider ,RESEARCH & development ,LUMINOSITY ,ALUMINUM alloys - Abstract
In the past two years the US LARP program carried out five tests on a quadrupole magnet aimed at the high luminosity upgrade of Large Hadron Collider (HiLumi-LHC). The 1-meter long, 120 mm bore \ Nb3{\ {Sn}} IR quadrupole magnet (HQ) with a short sample gradient of 219 T/m at 1.9 K and a conductor peak field of 15 T is part of the US LHC Accelerator Research Program (LARP). In a series of tests, carried out at 4.4 K, the magnet reached a maximum “short-sample” performance of 86%. The tests exposed several shortcomings that are now being addressed in a Research & Development program. This paper summarizes the magnet test results, reveals findings, R&D actions and future improvements. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
19. Design of LD1, a Large-Aperture High-Field Nb3Sn Dipole Magnet.
- Author
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Ferracin, P., Cheng, D. W., Dietderich, D. R., Felice, H., Godeke, A., Hafalia, A. R., Marchevsky, M., Sabbi, G., and Wang, X.
- Subjects
MAGNETIC dipoles ,ACCELERATOR magnets ,SUPERCONDUCTING magnets ,HIGH temperature superconductors ,HOMOGENEITY - Abstract
In order to continue supporting the development of accelerator magnets for the next generation of particle colliders, the LBNL Superconducting Magnet Program has started the design and fabrication of the Nb3Sn Large-aperture Dipole LD1. The goal of the magnet is to generate a dipole field of 13 T to 15 T in a clear aperture of 144 mm \times 94 mm, enabling high-field tests of Rutherford cables and insert coils made of Nb3Sn or high temperature superconductors (HTS), like Bi-2212, YBCO, and Bi-2223. The bore size will also accommodate large Cable-In-Conduit Conductors (CICC's), including ITER cables. We describe in this paper the design of LD1, in particular cable geometry, coil lay-out and support structure. Operational conditions based on strand measurements will be discussed, focusing on coil peak fields in straight section and end region, bore field homogeneity, and stress on the conductor during assembly, cool-down and excitation. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
20. Mechanical Behavior of HQ01, a \Nb3\Sn Accelerator-Quality Quadrupole Magnet for the LHC Luminosity Upgrade.
- Author
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Ferracin, P., Ambrosio, G., Anerella, M., Bossert, R., Caspi, S., Chlachidze, G., Cheng, D. W., Dietderich, D. R., Felice, H., Ghosh, A., Hafalia, A. R., Lizarazo, J., Marchevsky, M., Joseph, J., Sabbi, G., Schmalzle, J., Wanderer, P., Wang, X., and Zlobin, A. V.
- Subjects
MECHANICAL behavior of materials ,QUADRUPOLES ,LARGE Hadron Collider ,LUMINOSITY ,FIELD emission electron microscopy - Abstract
HQ01 is a superconducting quadrupole magnet under development by the LHC Accelerator Research Program (LARP) as a part of an R&D effort to demonstrate that Nb3Sn magnet technology is a viable option for a future luminosity upgrade of the LHC. The design is characterized by a 120 mm bore, a maximum gradient of 219 T/m at 1.9 K, and a support structure based on an aluminum shell pre-tensioned by water-pressurized bladders. The shell-based structure concept has already been successfully implemented in previous LARP quadrupole magnets. In HQ01, the structure incorporates additional features designed to provide full alignment between the support structure components and the coils. Specifically, the coil azimuthal alignment is achieved through outer layer pole keys which, by intercepting part of the force applied by bladders and shell, remain clamped to bolted aluminum collars from assembly to full excitation. A sequence of assemblies and cool-downs were executed with different keys sizes to characterize the alignment system and its impact on coil pre-load, at both room temperature and at 4.5 K. This paper reports on the mechanical behavior of the HQ01, by summarizing the strain gauge data and comparing them with FEM model predictions. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
21. Optimization and Test of 120 mm LARP Nb3Sn Quadrupole Coils Using Magnetic Mirror Structure.
- Author
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Bossert, R., Ambrosio, G., Andreev, N., Anerella, M., Barzi, E., Caspi, S., Cheng, D., Chlachidze, G., Dietderich, D., Felice, H., Ferracin, P., Ghosh, A., Hafalia, A. R., Kashikhin, V. V., Lamm, M., Nobrega, A., Novitski, I., Sabbi, G. L., Schmalzle, J., and Wanderer, P.
- Subjects
MAGNETICS ,QUADRUPOLES ,SUPERCONDUCTORS ,MAGNETISM -- Experiments ,THICKNESS measurement - Abstract
The US-LARP collaboration is developing a new generation of large-aperture high-field quadrupoles based on Nb3Sn superconductor for the LHC upgrades. The development and implementation of this new technology involves the fabrication and testing of series of model magnets, coils and other components with various design and processing features. New 120-mm HQ coils made of Rutherford cable, one with an interlayer resistive core, and both with optimized reaction processes, were fabricated and tested using a quadrupole mirror structure under operating conditions similar to those in a real magnet. The coils were instrumented with voltage taps and strain gauges to study the mechanical and quench performance. Quench antenna and temperature gauges were installed in the mirror structure to measure the coil temperature and locate quench origins. This paper presents details of the coil design and fabrication procedures, coil assembly and pre-stress in the quadrupole mirror structure, and coil test results. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
22. Mechanical Performance of the LARP Nb3Sn Quadrupole Magnet LQS01.
- Author
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Ferracin, P., Ambrosio, G., Anerella, M., Bingham, B., Bossert, R., Caspi, S., Cheng, D. W., Chlachidze, G., Felice, H., Hafalia, A. R., Mumper, W., Nobrega, F., Prestemon, S., Sabbi, G. L., Schmalzle, J., Sylvester, C., Tartaglia, M., Wanderer, P., and Zlobin, A. V.
- Subjects
QUADRUPOLES ,NIOBIUM compounds ,MECHANICAL behavior of materials ,ELECTRIC coils ,STRAINS & stresses (Mechanics) ,TIN ,NUMERICAL analysis - Abstract
As part of the effort towards the development of Nb3Sn magnets for future LHC luminosity upgrades, the LHC Accelerator Research Program (LARP) has fabricated and tested the quadrupole magnet LQS01. The magnet implements 3.4 m long Nb3Sn coils contained in a support structure characterized by an external aluminum shell segmented in four sections. The room temperature pre-load of the structure is obtained by shimming load keys through bladders, pressurized during the loading operations and removed before cool-down. Temperature compensated strain gauges, mounted on structure components and coil poles, monitor the magnet's mechanical behavior during assembly, cool-down and, excitation. During the first test, LQS01 reached the target gradient of 200 T/m; the gauge data indicated that the aluminum shell was pre-tensioned to the target value estimated by numerical models, but a lack of pre-load was measured in the coil inner layer during ramping. As a result, the test was interrupted and the magnet disassembled, and inspected. A second test (LQS01b) was then carried out following a re-loading of the magnet. The paper reports on the strain gauge results of the first test and the analysis performed to identify corrective actions to improve the coil pre-stress distribution. The mechanical performance of the magnet during the second cool-down and test is then presented and discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
23. Test Results of 15 T Nb3Sn Quadrupole Magnet HQ01 with a 120 mm Bore for the LHC Luminosity Upgrade.
- Author
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Caspi, S., Ambrosio, G., Anerella, M., Barzi, E., Bingham, B., Bossert, R., Cheng, D. W., Chlachidze, G., Dietderich, D. R., Felice, H., Ferracin, P., Ghosh, A., Hafalia, A. R., Hannaford, C. R., Joseph, J., Kashikhin, V. V., Sabbi, G. L., Schmalzle, J., Wanderer, P., and Xiaorong, W.
- Subjects
QUADRUPOLES ,LARGE Hadron Collider ,SUPERCONDUCTING magnets ,MAGNETIC separation ,ALUMINUM ,MECHANICAL behavior of materials ,ELECTRIC coils ,ELECTRICAL conductors - Abstract
In support of the luminosity upgrade of the Large Hadron Collider (LHC), the US LHC Accelerator Research Program (LARP) has been developing a 1-meter long, 120 mm bore Nb3Sn IR quadrupole magnet (HQ). With a short sample gradient of 219 T/m at 1.9 K and a conductor peak field of 15 T, the magnet will operate under higher forces and stored-energy levels than that of any previous LARP magnet models. In addition, HQ has been designed to incorporate accelerator quality features such as precise coil alignment and adequate cooling. The first 6 coils (out of the 8 fabricated so far) have been assembled and used in two separate tests—HQ01a and HQ01b. This paper presents design parameters, summary of the assemblies, the mechanical behavior as well as the performance of HQ01a and HQ01b. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
24. Recent Test Results of the High Field Nb3Sn Dipole Magnet HD2.
- Author
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Ferracin, P., Bingham, B., Caspi, S., Cheng, D. W., Dietderich, D. R., Felice, H., Hafalia, A. R., Hannaford, C. R., Joseph, J., Lietzke, A. F., Lizarazo, J., Sabbi, G., and Wang, X.
- Subjects
MAGNETIC dipoles ,NIOBIUM compounds ,TESTING laboratories ,MAGNETIC circuits - Abstract
The 1 m long Nb
3 Sn dipole magnet HD2, fabricated and tested at Lawrence Berkeley National Laboratory, represents a step towards the development of block-type accelerator quality magnets operating in the range of 13-15 T. The magnet design features two coil modules composed of two layers wound around a titanium-alloy pole. The layer 1 pole includes a round cutout to provide room for a bore tube with a clear aperture of 36 mm. After a first series of tests where HD2 reached a maximum bore field of 13.8 T, corresponding to an estimated peak field on the conductor of 14.5 T, the magnet was disassembled and reloaded without the bore tube and with a clear aperture increased to 43 mm. We describe in this paper the magnet training observed in two consecutive tests after the removal of the bore tube, with a comparison of the quench performance with respect to the previous tests. An analysis of the voltage signals recorded before and after training quenches is then presented and discussed, and the results of coil visual inspections reported. [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF
25. Assembly and Loading of LQS01, a Shell-Based 3.7 m Long Nb3Sn Quadrupole Magnet for LARP.
- Author
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Ferracin, P., Ambrosio, G., Anerella, M., Bingham, B., Bossert, R., Caspi, S., Cheng, D. W., Chlachidze, G., Felice, H., Hafalia, A. R., Hannaford, C. R., Mumper, W., Nobrega, F., Prestemon, S., Sabbi, G. L., Schmalzle, J., Sylvester, C., Tartaglia, M., Wanderer, P., and Zlobin, A. V.
- Subjects
QUADRUPOLES ,MAGNETS ,NIOBIUM compounds ,MAGNETIC circuits ,FINITE element method - Abstract
The LHC Accelerator Research Program (LARP) has been engaged in the fabrication of the 3.7 m long quadrupole magnet LQS01 in order to demonstrate that Nb
3 Sn magnets are a viable option for future LHC Luminosity upgrades. The LQS01 design, a scale-up of the 1 m long Technology Quadrupole TQS, includes four 3.4 m long cos(theta) coils contained in a support structure based on four 1 m long aluminum shells pre-tensioned with water-pressurized bladders (shell-type structure). In order to verify assembly procedures and loading operations, the structure was pre-stressed around solid aluminum "dummy coils" and cooled-down to 77 K. Mechanical behavior and stress variations were monitored with strain gauges mounted on the structure and on the dummy coils. The dummy coils were then replaced with Nb3 Sn coils in a second assembly and loading procedure, in preparation for the cool-down and test. This paper reports on the cool-down test with dummy coils and on the assembly and loading of LQS01, with a comparison between 3D finite element model predictions and strain gauge data. [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF
26. Assembly and Test of HD2, a 36 mm Bore High Field Nb3Sn Dipole Magnet.
- Author
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Ferracin, Paolo, Bingham, Brad, Caspi, Shiomo, Cheng, D. W., Dietderich, Daniel R., Felice, Helene, Godeke, Arno, Hafalia, A. R., Hannaford, C. R., Joseph, J. M., Lietzke, A. F., Lizarazo, Juan, Sabbi, GianLuca, Triflaud, Frederic, and Wang, X. R.
- Subjects
MAGNETIC dipoles ,MAGNETISM ,SUPERCONDUCTORS ,AXIAL loads ,ELECTRIC coils ,BARS (Engineering) ,ELECTRONIC excitation - Abstract
We report on the fabrication, assembly, and test of the Nb
3 Sn dipole magnet HD2. The magnet, aimed at demonstrating the application of Nb3 Sn superconductor in high field accelerator-type dipoles, features a 36 mm clear bore surrounded by block-type coils with tilted ends. The coil design is optimized to minimize geometric harmonics in the aperture and the magnetic peak field on the conductor in the coil ends. The target bore field of 15 T at 4.3 K is consistent with critical current measurements of extracted strands. The coils are horizontally pre-stressed during assembly using an external aluminum shell pre-tensioned with water-pressurized bladders. Axial pre-loading of the coil ends is accomplished through two end plates and four aluminum tension rods. The strain in coil, shell, and rods is monitored with strain gauges during assembly, cool-down and magnet excitation, and compared with 3D finite element computations. Magnet's training performance, quench locations, and ramp-rate dependence are then analysed and discussed. [ABSTRACT FROM AUTHOR]- Published
- 2009
- Full Text
- View/download PDF
27. Fabrication and Test of LARP Technological Quadrupole Models of TQC Series.
- Author
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Bossert, Rodger C., Ambrosio, Giorgio, Andreev, Nikolai, Barzi, Emanuela, Chlachidze, Guram, Feher, Sandor, Kashikhin, Vladimir S., Kashikhin, Vadim V., Lamm, Michael, Nobrega, Alfred, Novitski, Igor, Orris, Darryl, Tartaglia, Michael, Zlobin, Alexander V., Caspi, Shlomo, Dietderich, Daniel R., Ferracin, Paolo, Hafalia, A. R., Sabb, GianLuca, and Ghosh, Arup
- Subjects
NIOBIUM alloys ,TIN alloys ,SUPERCONDUCTING magnets ,QUADRUPOLES ,STRUCTURAL shells ,HADRON colliders - Abstract
In support of the development of a large-aperture Nb3Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, several two-layer technological quadrupole models of TQC series with 90 mm aperture and collar-based mechanical structure have been developed at Fermilab in collaboration with LBNL. This paper summarizes the results of fabrication and test of TQC02a, the second TQC model based on RRP Nb3Sn strand, and TQC02b, built with both MJR and RRP strand. The test results presented include magnet strain and quench performance during training, as well as quench studies of current ramp rate and temperature dependence from 1.9 K to 4.5 K. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
28. Test Results of LARP 3.6 m Nb3Sn Racetrack Coils Supported by Full-Length and Segmented Shell Structures.
- Author
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Muratore, Joseph F., Ambrosio, Giorgio, Anerella, Michael, Barzi, Emanuela, Bossert, Rodger, Caspi, Shiomo, Cheng, D. W., Cozzolino, John, Dietderich, Daniel R., Escallier, John, Feher, Sandor, Felice, Helene, Ferracin, Paolo, Ganetis, George, Ghosh, Arup K., Gupta, Ramesh C., Hafalia, A. R., Hannaford, C. R., Joshi, Piyush, and Kovach, Paul
- Subjects
SUPERCONDUCTING magnets ,STRUCTURAL shells ,NIOBIUM alloys ,TIN alloys ,STRAINS & stresses (Mechanics) ,METAL quenching ,SUPERCONDUCTING coils - Abstract
As part of the LHC Accelerator Research Program (LARP) to build a high performance quadrupole magnet with Nb
3 Sn conductor, a pair of 3.6 m-long Nb3 Sn racetrack coils has been made at Brookhaven National Laboratory (BNL) and installed in two shell-type support structures built by Lawrence Berkeley National Laboratory (LBL). These magnet assemblies have been tested at 4.5 K at BNL to gauge the effect of extended length and prestress on the mechanical performance of the long structure compared to earlier short models. This paper presents the results of quench testing and compares the overall performance of the two versions of the support structure. We also summarize the shell strain measurements and discuss the variation of quench current with ramp rate. [ABSTRACT FROM AUTHOR]- Published
- 2009
- Full Text
- View/download PDF
29. Fabrication and Test of a 3.7 m Long Support Structure for the LARP Nb3Sn Quadrupole Magnet LQS01.
- Author
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Ferracin, Paolo, Ambrosio, Giorgio, Anerella, Michael, Bingham, Brad, Bossert, Rodger, Caspi, Shiomo, Cheng, D. W., Felice, Helene, Hafalia, A. R., Hannaford, C. R., Nobrega, F., Prestemon, Soren, Sabbi, GianLuca, Jesse Schmalzle, Frederic Trillaud, Peter Wanderer, and Alexander V. Ziobin
- Subjects
MAGNETS ,QUADRUPOLES ,NIOBIUM compounds ,MAGNETIC properties ,FINITE element method ,LARGE Hadron Collider - Abstract
The 3.7 m long quadrupole magnet LQS01 represents a major step of the US LHC Accelerator Research Program (LARP) towards the development of long Nb
3 Sn accelerator quadrupole magnets for a LHC Luminosity upgrade. The magnet support structure is a scale up of the 1 m long Technology Quadrupole TQS design with some modifications suggested by TQS model test results. It includes an aluminum shell pre-tensioned over iron yokes using pressurized bladders and locking keys (bladder and key technology). The axial support is provided by two stainless steel end plates compressed against the coil ends by four stainless steel rods. The structure, instrumented with strain gauges, has been fabricated and assembled around four aluminum "dummy coils" to determine pre-load homogeneity and mechanical characteristics during cool-down. After presenting the main magnetic and mechanical parameters of LQS01, we report in this paper on the design, assembly, and test of the support structure, with a comparison between strain gauges data and 3D finite element model results. [ABSTRACT FROM AUTHOR]- Published
- 2009
- Full Text
- View/download PDF
30. Effect of Axial Loading on Quench Performance in Nb3 Sn Magnets.
- Author
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Ferracin, P., Ambrosio, G., Bordini, B., Caspi, S., Dietderich, D. R., Felice, H., Hafalia, A. R., Hannaford, C. R., Lizarazo, J., Lietzke, A. F., Mclnturff, A. D., Sabbi, G. L., DiMarco, J. D., Tartaglia, M., and Vedrine, P.
- Subjects
AXIAL loads ,ELECTRIC coils ,MAGNETS ,STAINLESS steel ,ALUMINUM ,ALLOYS ,CORROSION resistant materials ,SOLENOIDS - Abstract
A series of tests has been performed at Lawrence Berkeley National Laboratory (LBNL) and Fermi National Accelerator Laboratory (FNAL) with the goal of assessing the influence of coil axial pre-load on Nb
3 Sn magnet training. The tests involved two subscale Nb3 Sn magnets: SQ02, a quadrupole magnet fabricated as part of the US LHC Accelerator Research Program (LARP), and SD01, a dipole magnet developed in collaboration between CEA/Saclay and LBNL. Both magnets used similar Nb3 Sn flat racetrack coils from LBNL Subscale Magnet Program, and implemented an axial support system composed of stainless steel end-plates and aluminum rods. The system was designed to withstand full longitudinal electro-magnetic forces and provide controllable preloads. Quench performances, training, and quench locations have been recorded in various axial loading conditions. Test results are reported. [ABSTRACT FROM AUTHOR]- Published
- 2008
- Full Text
- View/download PDF
31. Development of the 15 T Nb.3Sn Dipole HD2.
- Author
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Ferracin, P., Caspi, S., Cheng, D. W., Dietderich, D. R., Hafalia, A. R., Hannaford, C. R., Higley, H., Lietzke, A. F., Lizarazo, J., Mclnturff, A. D., and Sabbi, G.
- Subjects
SUPERCONDUCTING magnets ,MAGNETIC dipoles ,COST effectiveness ,COMBINATORIAL geometry ,ALUMINUM ,STAINLESS steel ,MATHEMATICAL optimization ,ELECTRIC coils - Abstract
The Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) is continuing the development of HD2, a 1 m long Nb
3 Sn dipole generating a dipole field of 15 T in a 36 mm clear bore. With tilted (flared) ends to avoid obstructing the beam path, HD2 represents a step towards the development of high field and cost effective accelerator quality magnets. The design has been optimized to minimize geometric harmonics and to address iron saturation and conductor magnetization effects. The support structure is based on an external aluminum shell, pre-tensioned with pressurized bladders and interference keys. Aluminum axial rods and stainless steel end plates provide longitudinal support to the coil ends during magnet excitation. This paper reports on field quality optimization and magnet parameters. The design and fabrication of the coil and structure components, and results from coil winding, reaction, and potting are also presented. [ABSTRACT FROM AUTHOR]- Published
- 2008
- Full Text
- View/download PDF
32. Development and Test of LARP Technological Quadrupole Models of TQC Series.
- Author
-
Bossert, R. C., Ambrosio, G., Andreev, N., Barzi, E., Caspi, S., Chlachidze, G., Dietderich, D. T., Feher, S., Ferracin, P., Ghosh, A., Hafalia, A. R., Kashikhin, V. S., Kashikhin, V. V., Lamm, M. J., Nobrega, F., Novitski, I., Orris, D., Sabbi, G. L., Tartaglia, M., and Ziobin, A. V.
- Subjects
QUADRUPOLES ,QUADRUPOLE moments ,MAGNETIC materials ,MAGNETICS ,MAGNETS ,MAGNETISM ,SOLENOIDS ,ELECTROMAGNETIC theory ,NUCLEAR quadrupole resonance - Abstract
This paper describes the development and test of TQC01b and TQC02E, the second and third models in the TQC series. ANSYS analysis of the mechanical structure, its underlying assumptions, and changes based on experience with TQC01 are presented and discussed. Construction experience, in-process measurements, and modifications to the assembly since TQC01 are described. The test results presented here include magnet strain and quench performance during training of TQC01b and TQC02E. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
33. Assembly and Test of a Support Structure for 3.6 m Long Nb3 Sn Racetrack Coils.
- Author
-
Ferracin, P., Ambrosio, G., Anerella, M., Caspi, S., Cheng, D. W., Felice, H., Hafalia, A. R., Hannaford, C. R., Lietzke, A. F., Lizarazo, J., Muratore, J., Sabbi, G. L., Schmalzle, J., Thomas, R., and Wanderer, P. J.
- Subjects
MAGNETIC materials ,MAGNETS ,MAGNETICS ,MAGNETISM ,SOLENOIDS ,ALUMINUM ,LIGHT metals ,ALUMINUM alloying ,ALUMINUM foil - Abstract
The LHC Accelerator Research Program (LARP) is currently developing 4 m long Nb
3 Sn quadrupole magnets for a possible upgrade of the LHC Interaction Regions (IR). In order to provide a reliable test bed for the fabrication and test of long Nb,3 Sn coils, LARP has started the development of the long racetrack magnet LRS01. The magnet is composed of two 3.6 m long racetrack coils contained in a support structure based on an aluminum shell pre-tensioned with water-pressurized bladders and interference keys. For the phase-one test of the assembly procedure and loading operation, the structure was pre-stressed at room temperature and cooled down to 77 K with instrumented, solid aluminum "dummy coils". Mechanical behavior and stress homogeneity were monitored with strain gauges mounted on the shell and the dummy coils. The dummy coils were replaced with reacted and impregnated Nb3 Sn coils in a second assembly procedure, followed by cool-down to 4.5 K and powered magnet test. This paper reports on the assembly and loading procedures of the support structure as well as the comparison between strain gauge data and 3-D model predictions. [ABSTRACT FROM AUTHOR]- Published
- 2008
- Full Text
- View/download PDF
34. Test and Analysis of Technology Quadrupole Shell (TQS) Magnet Models for LARP.
- Author
-
Caspi, S., Ambrosio, G., Andreev, A. N., Barzi, E., Bossert, R., Dietderich, D. R., Ferracin, P., Ghosh, A., Hafalia, A. R., Kashikhin, V. V., Lietzke, A. F., Novitski, I., Sabbi, G. L., and Ziobin, A. V.
- Subjects
QUADRUPOLES ,QUADRUPOLE moments ,MAGNETIC materials ,MAGNETICS ,MAGNETS ,MAGNETISM ,SOLENOIDS ,LIGHT metals ,ELECTROMAGNETIC theory - Abstract
Test results are reported on four quadrupole magnet model tests (TQS01a, TQS01b, TQS01c, TQS02) in support of the development of a large-aperture Nb
3 Sn superconducting quadrupole for the US LHC Accelerator Research Program (LARP). All four magnet assemblies used key and bladder technology to compress and support the coils within an iron yoke and an aluminum shell. The first three models tested different magnet assemblies of several coils, having MJR conductor, and gapped segmented bronze pole-islands. TQS02's coils utilized improved (RRP) Nb3 Sn conductor, and addressed TQS01's quench-training pattern, by utilizing titanium alloy (TiA16V4) pole-islands, with no axial gaps during reaction. This paper summarizes the assembly, cool-down and performance of TQS01a, TQS01b, TQS01c, and TQS02 and compares measurements with design expectations. [ABSTRACT FROM AUTHOR]- Published
- 2008
- Full Text
- View/download PDF
35. Construction and Test of 3.6 m Nb3 Sn Racetrack Coils for LARP.
- Author
-
Wanderer, P., Ambrosio, G., Anerella, M., Barzi, E., Bossert, R., Caspi, S., Cheng, D. W., Cozzolino, J., Dietderich, D. R., Escallier, J., Feher, S., Ferracin, P., Ganetis, G., Ghosh, A. K., Gupta, R. C., Hafalia, A. R., Hannaford, C. R., Joshi, P., Kovach, P., and Lietzke, A. F.
- Subjects
QUADRUPOLES ,ELECTROMAGNETIC theory ,DIPOLE moments ,QUADRUPOLE moments ,MAGNETIC materials ,MAGNETS ,MAGNETICS ,MAGNETISM ,SOLENOIDS - Abstract
Development of high-performance Nb
3 Sn quadrupoles is one of the major goals of the LHC Accelerator Research Program (LARP). As part of this program, long racetrack magnets were made in order to ~heck the fabrication steps for long Nb3 Sn coils, that the changes in coil length that take place during reaction and cooldown are correctly accounted for in the quadrupole design, and the use of a long aluminum shell for the support structure. This paper reports the construction of the first long Nb3 Sn magnet with racetrack coils 3.6 m long. The magnet reached a nominal "plateau" at 9596 A after five quenches. This is about 90% of the estimated conductor limit. The peak field in the coils at this current was 11 T. [ABSTRACT FROM AUTHOR]- Published
- 2008
- Full Text
- View/download PDF
36. Design, Fabrication, and Test of a Superconducting Dipole Magnet Based on Tilted Solenoids.
- Author
-
Caspi, S., Dietderich, D. R., Ferracin, P., Finney, N. R., Fuery, M. J., Gourlay, S. A., and Hafalia, A. R.
- Subjects
MAGNETS ,SOLENOID magnetic fields ,MAGNETIC materials ,MAGNETIC dipoles ,DIPOLE moments ,SUPERCONDUCTING magnets ,MAGNETIC fields ,SUPERCONDUCTORS ,HIGH temperature superconductivity - Abstract
It can be shown that, by superposing two solenoid-like thin windings that are oppositely skewed (tilted) with respect to the bore axis, the combined current density on the surface is ‘cos-theta’ like and the resulting magnetic field in the bore is a pure dipole. As a proof of principle, such a magnet was designed, built and tested as part of a summer undergraduate intern project. The measured field in the 25 mm bore, 4 single strand layers using NbTi superconductor, exceeded 1 T. The simplicity of this high field quality design, void of typical wedges end-spacers and coil assembly, is especially suitable for insert-coils using High Temperature Superconducting wire as well as for low cost superconducting accelerator magnets for High Energy Physics. Details of the design, construction and test are reported. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
37. Test Results of a Nb3Sn Wind/React "Stress-Managed" Block Dipole.
- Author
-
McInturff, A., Bish, P., Blackburn, R., Diaczenko, N., Elliott, T., Hafalia Jr., R., Henchel, W., Jaisle, A., Lau, W., Lietzke, A., McIntyre, P., Noyes, P., and Sattarov, A.
- Subjects
MAGNETIC dipoles ,ELECTRIC coils ,STRAINS & stresses (Mechanics) ,MAGNETICS ,ROBUST control ,MAGNETIC fields ,GEOMETRY ,DIPOLE moments ,MAGNETISM - Abstract
A second phase of a high field dipole technology development has been tested. A Nb
3 Sn block-coil model dipole was fabricated, using magnetic mirror geometry and wind/react coil technology. The primary objective of this phase was to make a first experimental test of the stress-management strategy pioneered at Texas A&M. In this strategy a high-strength support matrix is integrated with the windings to intercept Lorentz stress from the inner winding so that it does not accumulate in the outer winding. The magnet attained a field that was consistent with short sample limit on the first quench; there was no training. The decoupling of Lorentz stress between inner and outer windings was validated. In ramp rate studies the magnet exhibited a remarkable robustness in rapid ramping operation. It reached 85 % of short sample(ss) current even while ramping 2–3 T/s. This robustness is attributed to the orientation of the Rutherford cables parallel to the field in the windings, instead of the transverse orientation that characterizes common dipole designs. Test results are presented and the next development phase plans are discussed. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
38. Design and Test of a Nb3Sn Subscale Dipole Magnet for Training Studies.
- Author
-
Felice, Helene, Caspi, Shlomo, Dietderich, Daniel R., Ferracin, Paolo, Gourlay, Steve A., Hafalia, Aurelio R., Lietzke, Alan F., Mailfert, Alain, Sabbi, GianLuca, and Vedrine, Pierre
- Subjects
MAGNETIC dipoles ,SUPERCONDUCTING magnets ,ELECTRIC coils ,MAGNETIC fields ,MAGNETICS ,SUPERCONDUCTORS ,LORENTZ transformations ,MECHANICAL models ,STRAINS & stresses (Mechanics) - Abstract
As part of a collaboration between CEA/Saclay and the Superconducting Magnet Group at LBNL, a subscale dipole structure has been developed to study training in Nb
3 Sn coils under variable pre-stress conditions. This design is derived from the LBNL Subscale Magnet and relies on the use of identical Nb3 Sn racetrack coils. Whereas the original LBNL subscale magnet was in a dual bore ‘common-coil’ configuration, the new subscale dipole magnet (SD) is assembled as a single bore dipole made of two superposed racetrack coils. The dipole is supported by a new mechanical structure developed to withstand the horizontal and axial Lorentz forces and capable of applying variable vertical, horizontal and axial preload. The magnet was tested at LBNL as part of a series of training studies aiming at understanding of the relation between pre-stress and magnet performance. Particular attention is given to the coil ends where the magnetic field peaks and stress conditions are the least understood. After a description of SD design, assembly, cool-down and tests results are reported and compared with the computations of the OPERA3D and ANSYS magnetic and mechanical models. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
39. LARP Long Nb3Sn Racetrack Coil Program.
- Author
-
Wanderer, P., Ambrosio, G., Anerella, M., Barzi, E., Bossert, R., Cheng, D., Cozzolino, J., Escallier, J., Ferracin, P., Ganetis, G., Ghosh, A. K., Gupta, R. C., Hafalia, A. R., Hannaford, C. R., Joshi, P., Kovach, P., Lietzke, A. F., Louie, W., Marone, A., and McInturff, A. D.
- Subjects
NIOBIUM ,TIN ,ELECTRIC coils ,MAGNETIC circuits ,ELECTRIC inductors ,MAGNETS ,QUADRUPOLES ,DIPOLE moments ,QUADRUPOLE moments ,ELECTROMAGNETIC theory - Abstract
Development of high-performance Nb
3 Sn quadrupoles is one of the major goals of the LHC Accelerator Research Program (LARP). As part of this program, long racetrack magnets are being made in order to check that the change in coil length that takes place during reaction is correctly accounted for in the quadrupole design and to check for length effects in implementing the ‘shell’ method of coil support. To check the racetrack magnet manufacturing plan, a short racetrack magnet is being made. This magnet will be the first to use restack-rod process Nb3 Sn, making it a ‘long sample’ test vehicle for this new material. The paper reports the reaction and characterization of the Nb3 Sn, and construction features and test results from the short racetrack magnet. The paper also reports on the status of the construction of the first long racetrack magnet. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
40. Fabrication and Test of TQS01—A 90 mm Nb3Sn Quadrupole Magnet for LARP.
- Author
-
Caspi, S., Dietderich, D., Ferracin, P., Gourlay, S. A., Hafalia, A. R., Hannaford, R., Lietzke, A. F., McInturff, A. D., Sabbi, G. L., Ghosh, A., Andreev, A. N., Barzi, E., Bossert, R., Kashikhin, V. V., Novitski, I., Whitson, G., and Zlobin, A. V.
- Subjects
SUPERCONDUCTING magnets ,QUADRUPOLES ,ELECTROMAGNETIC theory ,DIPOLE moments ,QUADRUPOLE moments ,HADRON colliders ,COLLIDERS (Nuclear physics) ,TESTING laboratories - Abstract
In support of the development of a large-aperture Nb
3 Sn superconducting quadrupole for the Large Hadron Collider luminosity upgrade, two models (TQS and TQC) with a 90-mm aperture are being constructed at LBNL and FNAL within the framework of the US LHC Accelerator Research Program (LARP). These models use two identical Nb3 Sn coils but have different coil support structures. This paper describes the fabrication, assembly, cool-down and test of TQS01—a model based on key and bladder technology with supporting iron yoke and an aluminum shell. Comparison of the test measurements with design expectations is also reported. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
41. Design and Fabrication of a Supporting Structure for 3.6 m Long Nb3Sn Racetrack Coils.
- Author
-
Ferracin, P., Ambrosio, G., Anerella, M., Barzi, E., Caspi, S., Cheng, D. W., Dietderich, D. R., Gourlay, S. A., Hafalia, A. R., Hannaford, C. R., Lietzke, A. F, Nobrega, A. R., Sabbi, G. L., Schmalzle, J., Wanderer, P. J., and Zlobin, A. V.
- Subjects
SUPERCONDUCTING magnets ,MAGNETICS ,MAGNETISM ,MAGNETS ,MAGNETIC circuits ,ALUMINUM ,ELECTROMAGNETS ,ALUMINUM bronze ,ELECTRIC coils - Abstract
As part of the LHC Accelerator Research Program (LARP), three US national laboratories (BNL, FNAL, and LBNL) are currently engaged in the development of superconducting magnets for the LHC Interaction Regions (IR) beyond the current design. As a first step towards the development of long Nb
3 Sn quadrupole magnets, a 3.6 m long structure, based on the LBNL Subscale Common-Coil Magnet design, will be fabricated, assembled, and tested with aluminum-plate ‘dummy coils’. The structure features an aluminum shell pre-tensioned over iron yokes using pressurized bladders and locking keys (bladder and key technology). Pre-load homogeneity and mechanical responses are monitored with pressure sensitive films and strain gauges mounted on the aluminum shell and the dummy coils. The details of the design and fabrication are presented and discussed, and the expected mechanical behavior is analysed with finite element models. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
42. Assembly and Tests of SQ02, a Nb3Sn Racetrack Quadrupole Magnet for LARP.
- Author
-
Ferracin, P., Ambrosio, G., Barzi, E., Caspi, S., Dietderich, D. R., Feher, S., Gourlay, S. A., Hafalia, A. R., Hannaford, C. R., Lizarazo, J., Lietzke, A. F., McInturff, A. D., Sabbi, G. L., and Zlobin, A. V.
- Subjects
SUPERCONDUCTING magnets ,SUPERCONDUCTIVITY ,MAGNETISM ,ALUMINUM bronze ,SPEED ,ELECTRIC coils ,MAGNETS ,MAGNETICS ,THERMAL expansion - Abstract
The US LHC Accelerator Research Program (LARP) is developing Nb
3 Sn accelerator magnets for a possible LHC luminosity upgrade. As part of the LARP supporting R&D, a subscale racetrack quadrupole magnet (SQ) has been developed in order to provide a cost effective tool for technology development studies. The first magnet (SQ01), reported earlier, was tested as a proof-of-principle model that applied for the first time LBNL shell-based loading structure to Nb3 Sn racetrack coils in a quadrupole configuration. The new loading structure, pre-loaded with water-pressurized bladders and keys, provided predictable and controllable pre-stress to four subscale racetrack coils, both in the end region and across the straight section. A second magnet (SQ02) has been recently completed, with the goal of assessing the conductor performance and the influence of the coil axial support on training. SQ02 implements four new coils wound around aluminum bronze islands and instrumented with voltage taps and spot heaters, in order to monitor quench locations and propagation velocities. This paper reports the SQ02 test results, including magnet quench performance with respect to short sample expectations, training history, and quench locations. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
43. Development of TQCO 1, a 90 mm Nb3 Sn Model Quadrupole for LHC Upgrade Based on SS Collar.
- Author
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Bossert, R. C., Ambrosio, G., Andreev, N., Barzi, E., Caspi, S., Dietderich, D. R., Ferracin, P., Ghosh, A., Gourlay, S. A., Hafalia, A. R., Hannaford, C. R., Kashikhin, V. S., Kashikhin, V. V., Lietzke, A. F., Mattafirri, S., Mclnturff, A. D., Novitski, I., Sabbi, G. L., Turrioni, D., and Whitson, G.
- Subjects
MAGNETICS ,MAGNETS ,QUADRUPOLES ,ELECTRIC coils ,LARGE Hadron Collider - Abstract
As a first step toward the development of a large-aperture Nb
3 Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer technological quadrupole models (TQS01 at LBNL and TQC01 at Fermilab) are being constructed within the framework of the US LHC Accelerator Research Program (LARP). Both models use the same coil design, but have different coil support structures. This paper describes the TQC01 design, fabrication technology and summarizes its main parameters. [ABSTRACT FROM AUTHOR]- Published
- 2006
- Full Text
- View/download PDF
44. Design and Analysis of TQS01, a 90 mm Nb3Sn Model Quadrupole for LHC Luminosity Upgrade Based on a Key and Bladder Assembly.
- Author
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Caspi, S., Ambrosio, G., Andreev, N., Barzi, E., Bossert, R. C., Dietderich, D. R., Ferracin, P., Ghosh, A., Gourlay, S. A., Hafalia, A. R., Hannaford, C. R., Kashikhin, V. S., Kashikhin, V. V., Lietzke, A. F., Mattafirri, S., Mclnturff, A. D., Novitsky, I. V., Sabbi, G. L., Turrioni, D., and Yamada, R.
- Subjects
MAGNETICS ,QUADRUPOLES ,ELECTRIC coils ,MAGNETS ,LORENTZ transformations - Abstract
The US LHC Accelerator Research Program (LARP) is developing Nb
3 Sn accelerator magnet technology for the LHC luminosity upgrade. Two 90 mm ‘Technology Quadrupole’ models (TQS01, TQC01) are being developed in close collaboration between LBNL and FNAL, using identical coil design, but two different support structures. The TQS01 structure was developed and tested at LBNL. With this approach coils are supported by an outer aluminum shell and assembled using keys and bladders. In contrast, the second model TQC01, utilize stainless steel collars and a thick stainless steel skin. This paper describes the TQS01 model magnet, its 3D ANSYS stress analysis, and anticipated instrumentation and assembly procedure. [ABSTRACT FROM AUTHOR]- Published
- 2006
- Full Text
- View/download PDF
45. Mechanical Design of HD2, a 15 T Nb3Sn Dipole Magnet with a 35 mm Bore.
- Author
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Ferracin, P., Bartlett, S. E., Caspi, S., Dietderich, D. R., Gourlay, S. A., Hafalia, A. R., Hannaford, C. R., Lietzke, A. F., Mattafirri, S., Mclnturff, A. D., and Sabbi, G. L.
- Subjects
MAGNETIC dipoles ,SUPERCONDUCTING magnets ,FINITE element method ,ELECTRIC coils ,LORENTZ transformations ,MAGNETICS - Abstract
After the fabrication and test of HD1, a 16 T Nb
3 Sn dipole magnet based on fiat racetrack coil configuration, the Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) is developing the Nb3 Sn dipole HD2. With a dipole field above 15 T, a 35 mm clear bore, and nominal field harmonics within a fraction of one unit, HD2 represents a further step towards the application of block-type coils to high-field accelerator magnets. The design features tilted racetrack-type ends, to avoid obstructing the beam path, and a 4 mm thick stainless steel tube, to support the coil during the pre-loading operation. The mechanical structure, similar to the one used for HD1, is based on an external aluminum shell pre-tensioned with pressurized bladders. Axial rods and stainless steel plates provide longitudinal support to the coil ends during magnet excitation. A 3D finite element analysis has been performed to evaluate stresses and deformations from assembly to excitation, with particular emphasis on conductor displacements due to Lorentz forces. Numerical results are presented and discussed. [ABSTRACT FROM AUTHOR]- Published
- 2006
- Full Text
- View/download PDF
46. Assembly and Test of SQ01b, a Nb3Sn Quadrupole Magnet for the LHC Accelerator Research Program.
- Author
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Ferracin, P., Ambrosio, G., Bartlett, S. E., Bordini, B., Carcagno, R. H., Caspi, S., Dietderich, D. R., Feher, S., Gourlay, S. A., Hafalia, A. R., Kashikhin, V. V., Lamm, M. J., Lietzke, A. F., Mattafirri, S., Mclnturff, A. D., Orris, D. F., Pischalnikov, Y. M., Sabbi, G. L., Sylvester, C. D., and Tartaglia, M. A.
- Subjects
MAGNETICS ,MAGNETS ,QUADRUPOLES ,MAGNETIC measurements ,FINITE element method - Abstract
The US LHC Accelerator Research Program (LARP) consists of four US laboratories (BNL, FNAL, LBNL, and SLAC) collaborating with CERN to achieve a successful commissioning of the LHC and to develop the next generation of Interaction Region magnets. In 2004, a large aperture Nb
3 Sn racetrack quadrupole magnet (SQ01) has been fabricated and tested at LBNL. The magnet utilized four subscale racetrack coils and was instrumented with strain gauges on the support structure and directly over the coil's turns. SQ01 exhibited training quenches in two of the four coils and reached a peak field in the conductor of 10.4 T at a current of 10.6 kA. After the test, the magnet was disassembled, inspected with pressure indicating films, and reassembled with minor modifications. A second test (SQ01b) was performed at FNAL and included training studies, strain gauge measurements and magnetic measurements, Magnet inspection, test results, and magnetic measurements are reported and discussed, and a comparison between strain gauge measurements and 3D finite element computations is presented. [ABSTRACT FROM AUTHOR]- Published
- 2006
- Full Text
- View/download PDF
47. Magnet R&D for the US LHC Accelerator Research Program (LARP).
- Author
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Gourlay, S. A., Ambrosio, G., Andreev, N., Anerella, M., Barzi, E., Bossert, R., Caspi, S., Dietderich, D. R., Ferracin, P., Gupta, R., Ghosh, A., Hafalia, A. R., Hannaford, C. R., Harrison, M., Kashikhin, V. S., Kashikhin, V. V., Lietzke, A. F., Mattafirri, S., McInturff, A. D., and Nobrega, F.
- Subjects
MAGNETISM ,MAGNETS ,QUADRUPOLES ,SUPERCONDUCTING magnets ,LARGE Hadron Collider - Abstract
In 2004, the US DOE established the LHC Accelerator Research Program (LARP) with the goal of developing a technology base for future upgrades of the LHC. The focus of the magnet program, which is a collaboration of three US laboratories, BNL, FNAL and LBNL, is an development of high gradient quadrupoles using Nb3Sn superconductor. Other program components address issues regarding magnet design, radiation-hard materials, long magnet scale-up, quench protection, fabrication techniques and conductor and cable R&D. This paper presents an overall view of the program with emphasis on the current quadrupole project and outlines the long-term goals of the program. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
48. Structure for an LHC 90 mm Nb3Sn Quadrupole Magnet.
- Author
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Hafalia, A. R., Caspi, S., Bartlett, S. B., Dietderich, D. R., Ferracin, P., Gourlay, S. A., Hannaford, C. R., Higley, H., Lietzke, A. F., Lau, B., Liggins, N., Mattafirri, S., McInturff, A. D., Nyman, M., Sabbi, G. L., Scanlan, R. M., and Swanson, J.
- Subjects
- *
QUADRUPOLES , *ALUMINUM , *COOLING , *SUPERCONDUCTING magnets , *SUPERCONDUCTORS , *PROTOTYPES - Abstract
A full-scale mechanical model of the LHC Nb3Sn quadrupole magnet structure has been designed, built and tested. The structure will support a 90 mm bore, lm long magnet prototype as part of the US LHC Accelerator Research Program (LARP). The structure utilizes Bladder and Key Technology to control and transfer pre-stress from an outer aluminum shell to an inner coil. Axial aluminum rods take care of pre-stress at the ends--ensuring that the coil is fully constrained along all three axes. The outer aluminum shell and an inner "dummy coil" (aluminum tube) were extensively instrumented with strain gauges. The gauges were used to monitor and map the effectiveness of the stress relation between the loading structure and a "dummy" coil through varying mechanical load conditions--from bladder and key pit-stress at room temper- attire through cool-down. Test results of the stress distribution in the structure and the in dummy coil is reported and compared with expected results calculated with the structural analysis program ANSYS. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
49. Measured Strain in Nb3 Sn Coils During Excitation and Quench.
- Author
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Caspi, S., Bartlett, S. E., Dietderich, D. R., Ferracin, P., Gourlay, S. A., Hannaford, C. R., Hafalia, A. R., Lietzke, A. F., Mattafirri, S., Nyman, M., and Sabbi, G.
- Subjects
SUPERCONDUCTING magnets ,MAGNETS ,COOLING ,MAGNETISM ,MAGNETICS ,SUPERCONDUCTORS - Abstract
The strain in a high field Nb
3 Sn coil was measured during magnet assembly, cool-down, excitation and spot heater quenches. Strain was measured with a full bridge strain gauge mounted directly over the turns and impregnated with the coil. Two such coils were placed in a "common coil" fashion capable of reaching 11 T at 4.2 K. The measured steady state strain in the coil is compared with results obtained using the FEM code ANSYS. During quenches, the transient strain (due to temperature rise) was also measured and compared with the calculated mechanical time response to a quench. [ABSTRACT FROM AUTHOR]- Published
- 2005
- Full Text
- View/download PDF
50. Performance Analysis of HD1: A 16 Tesla Nb3Sn Dipole Magnet.
- Author
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Mattafirri, S., Bartlett, S. E., Bish, P. A., Caspi, S., Dietderich, D. R., Ferracin, P., Gourlay, S. A., Hannaford, C. R., Hafalia, A. R., Lau, W. G., Lietzke, A. F., Mclnturff, A. D., Nyman, M., Sabbi, G. L., and Scanlan, R. M.
- Subjects
SUPERCONDUCTING magnets ,MAGNETIC dipoles ,DIPOLE moments ,LABORATORIES ,ELECTROSTATIC accelerators ,TECHNOLOGY - Abstract
The Superconducting Magnet Group at Lawrence Berkeley National Laboratory (LBNL) has been developing technology for high field accelerator magnets from brittle conductors, HD1 is a single bore block dipole magnet using two, double-layer Nb
3 Sn flat racetrack coils. The magnet was tested in October 2003 and reached a bore peak field of 16 T (94.5% of short sample). The average quench current plateau appeared to be limited by "stick slip" conductor motions. Diagnostics recorded quench origins and preload distributions. Cumulative deformation of the mechanical structure has been observed. Quench velocity in different field regions has been measured and compared with model predictions. The results Obtained during the HD1 test are presented and discussed. [ABSTRACT FROM AUTHOR]- Published
- 2005
- Full Text
- View/download PDF
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