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Your search keyword '"Chichili, D. R."' showing total 15 results
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15 results on '"Chichili, D. R."'

1. Development and test of Nb$_3$Sn cos-theta dipoles based on PIT strands

Author

Zlobin, A V, Ambrosio, G, Andreev, N, Barzi, E, Bossert, R, Carcagno, R, Chichili, D R, Elementi, L, Feher, S, Kashikhin, V V, Lamm, M J, Novitski, I, Pischalnikov, Yu, Sylvester, C, Tartaglia, M, and Yamada, R

Subjects
Physics::Accelerator Physics, Accelerators and Storage Rings
Abstract

Fermilab is involved in the development of new generation high-field accelerator magnets using state-of-the-art Nb$_3$Sn strands produced using different technologies. Two 1-m long models-mirror configuration and dipole magnet-were fabricated recently at Fermilab based on powder-in-tube (PIT) Nb$_3$Sn strands with small effective filament size. This paper describes the parameters of superconducting strands and cable, the details of magnet design and fabrication procedure, and reports the results of PIT coil testing.

Published
2005

2. Development and test of single-bore $Cos \vartheta$ Nb$_3$Sn dipole models with cold iron yoke

Author

Andreev, N, Ambrosio, G, Barzi, E, Carcagno, R, Chichili, D R, DiMarco, J, Feher, S, Imbasciati, L, Kashikhin, V V, Lamm, M, Limon, P J, Orris, D, Schlabach, P, Sylvester, C, Tartaglia, M, Terechkine, I, Tompkins, J C, Yadav, S, Yamada, R, and Zlobin, A V

Subjects
Accelerators and Storage Rings, Computer Science::Other
Abstract

Two short Nb$_3$Sn dipole models based on a single-bore cos-theta coil with a cold iron yoke were fabricated and tested at Fermilab. This paper summarizes the details of magnet design and fabrication procedure, and reports the test results including quench performance and quench heater studies, and the magnetic measurements.

Published
2002

4. Field quality of quadrupole R&D models for the LHC IR

Author

Andreev, N, Arkan, T T, Bauer, P, Bossert, R, Brandt, J, Chichili, D R, Di Marco, J, Fehér, S, Kerby, J S, Lamm, M J, Limon, P, Nobrega, F, Novitski, I, Ogitsu, T, Orris, D, Ozelis, J P, Peterson, T, Sabbi, G L, Schlabach, P, Strait, J B, Sylvester, C D, Tartaglia, M, Tompkins, J, Yadav, S, Zlobin, A V, Caspi, S, and Scanlan, S

Subjects
Physics::Accelerator Physics, Accelerators and Storage Rings
Abstract

Superconducting quadrupole magnets operating in superfluid helium at 1.9 K, with 70 mm bore and nominal field gradient of 205 T/m at collision optics, are being developed by the US LHC Accelerator Project for the Interaction Regions of the Large Hadron Collider (LHC). A magnet model program to validate and optimize the design is underway. This paper reports results of field quality measurements of four model magnets. (3 refs).

Published
1999

6. Fabrication of Nb3Sn Shell-Type Coils with Pre-Preg Ceramic Insulation.

Author

Chichili, D. R., Andreev, N., Kashikhin, V. S., Zlobin, A. V., Codell, D., Fabian, P., and Tupper, M.

Subjects
*ELECTRIC coils, *CERAMIC materials, *ELECTRIC insulators & insulation, *INSULATING materials, *ELECTRIC resistance, *SUPERCONDUCTING magnets, *SUPERCONDUCTORS, *SOLID state electronics, *CRYOELECTRONICS
Abstract

Insulation is one of the critical components for high-field Nb3Sn magnets that follow wind-and-react approach. The insulation material has to withstand high bending stresses while winding the coil and high heat-treatment temperatures under pressure during coil reaction. At Fermilab we have developed a procedure and tested successfully the dry ceramic insulation tape with inorganic liquid binder to wind and cure the coils. Recently we have extended this to a pre-preg ceramic insulation tape, which would minimize and control the amount of binder in the coil. Several coils with various insulation patterns have been fabricated and tested at Fermilab. This paper discusses the fabrication issues of the coils with different types of cable insulation including the pre-preg ceramic insulation. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
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7. Volume expansion of Nb-Sn strands and cables during heat treatment.

Author

Andreev, N., Barzi, E., Chichili, D. R., Mattafirri, S., and Zlobin, A. V.

Subjects
SUPERCONDUCTING magnets, HEAT treatment of metals
Abstract

In the recent years, Nb[sub 3]Sn has been widely used for the development of high field superconducting magnets. It is known that the unreacted Nb-Sn composite undergoes a volume expansion during heat treatment due to the formation of the Nb[sub 3]Sn phase. In an asreceived strand this expansion is isotropic. However, an anisotropic volume expansion was observed in the Rutherford-type cable samples. A systematic study was undertaken to investigate this phenomenon and to check the hypothesis that the plastic deformation of the strands during cabling process is responsible for this behavior. Nb-Sn strands from various manufacturing technologies were rolled down to different sizes, and the resulting thickness and width of the deformed strands were measured before and after heat treatment. The results obtained on the deformed strands were then compared with those obtained from cables. A good consistency was achieved in most of the cases. [ABSTRACT FROM AUTHOR]

Published
2002

9. R&D of Nb3Sn Accelerator Magnets at Fermilab.

Author

Ziobin, A. V., Ambrosio, G., Andreev, N., Barzi, B., Bordini, B., Bossert, R., Carcagno, R., Chichili, D. R., Dimarco, J., Elementi, L., Feher, S., Kashikhrn, V. S., Kashikhin, V. V., Kephart, R., Lamm, M., Limon, P. J., Novitski, I., Orris, D., Yu Pischalnikov, and Schiabach, P.

Subjects
SUPERCONDUCTORS, MAGNETICS, MAGNETISM, MAGNETS, SOLID state electronics, MAGNETIC dipoles
Abstract

Fermilab is developing and investigating different high-field magnets (HFM) for present and future accelerators. The HFM R&D program focused on the 10-12 T magnets based on Nb3Sn superconductor and explored both basic magnet technologies for brittle superconductors-wind-and-react and react-and-wind. Magnet design studies in support of LHC upgrades and VLHC were conducted. A series of 1-m long cos-theta dipole models based on the wind-and-react technique was fabricated and tested. Three 1-m long flat racetracks and the common coil dipole model, based on a single-layer coil and react-and-wind technique, were also fabricated and tested. Extensive theoretical and experimental studies of electro-magnetic instabilities in Nb3Sn strands, cables and magnets were performed and led to a successful 10 T dipole model. This paper presents the details of Fermilab's HFM program, reports its status and major results, and formulates the next steps for the program. [ABSTRACT FROM AUTHOR]

Published
2005
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10. Test Results of LHC Interaction Regions Quadrupoles Produced by Fermilab.

Author

Feher, S., Bossert, R., Carson, J., Chichili, D. R., Kerby, J., Lamm, M. J., Nobrega, A., Nicol, T., Ogitsu, T., Orris, D., Page, T., Peterson, T., Rabehi, R., Robotham, W., Scanlan, R., Schiabach, P., Sylvester, C., Strait, J., Tartaglia, M., and Tompkins, J. C.

Subjects
ELECTROMAGNETIC theory, QUADRUPOLES, CRYOSTATS, MAGNETIC dipoles, ANTENNAS (Electronics)
Abstract

The US-LHC Accelerator Project is responsible for the production of the Q2 optical elements of the final focus triplets in the LHC interaction regions. As part of this program Fermilab is in the process of manufacturing and testing cryostat assemblies (LQXB) containing two identical quadrupoles (MQXB) with a dipole corrector between them. The 5.5 m long Fermilab designed MQXB have a 70 mm aperture and operate in superfluid helium at 1.9 K with a peak field gradient of 215 T/m. This paper summarizes the test results of several production MQXB quadrupoles with emphasis on quench performance and alignment studies. Quench localization studies using quench antenna signals are also presented. [ABSTRACT FROM AUTHOR]

Published
2005
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11. Test Results of Shell-Type Nb3Sn Dipole Coils.

Author

Feber, S., Ambrosio, G., Andreev, N., Barzi, E., Carcagno, R., Chichili, D. R., Kashikhin, VI., Kashikhin, V. V., Lanm, M. J., Orris, D., Pischalnikov, Y., Sylvester, C., Tartaglia, M., Tompkins, J. C., Yadav, S., Yamada, R., and Ziobin, A. V.

Subjects
MAGNETS, MAGNETIC dipoles, DIPOLE moments, MAGNETIC circuits, ELECTRIC cables, METAL quenching
Abstract

Several different shell type coils were made by using the 'wind-and-react' technique, installed in a mirror magnet configuration and tested at Fermilab. The results revealed that the previously suspect splice technique is adequate and is not responsible for the quench performance limitation. Cable instability is the preferred candidate, however this might be coupled with other effects since all of the experimental results cannot be explained exclusively with cable instability. [ABSTRACT FROM AUTHOR]

Published
2004
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12. Test Results From the LQXB Quadrupole Production Program at Fermilab for the LHC Interaction Regions.

Author

Bossert, R., Carson, J., Chichili, D. R., Feher, S., Kerby, J., Lamm, M. J., Nobrega, A., Nicol, T., Ogitsu, T., Orris, D., Page, T., Peterson, T., Rabehl, R., Robotham, W., Scanlan, R., Schlabach, P., Sylvester, C., Strait, J., Tartaglia, M., and Tompkins, J. C.

Subjects
QUADRUPOLES, LARGE Hadron Collider, MAGNETISM, CRYOSTATS, ASSEMBLY line methods
Abstract

As part of the US-LHC Accelerator Project, Fermilab is producing fully cryostated assemblies that will be installed as the Q1, Q2 and Q3 optical elements for the LHC Inner Triplets. The main quadrupole magnets in the Q1 (LQXA) and Q3 (LQXC) assemblies are MQXA elements designed and fabricated by KEK and Toshiba, while those in the Q2 (LQXB) assemblies are MQXB quadrupoles designed and fabricated by Fermilab. The cryostat assemblies for all magnets are designed by Fermilab, and final assembly of the optical elements occurs at Fermilab. This paper describes the production test results for the second LQXB cryostat assembly. [ABSTRACT FROM AUTHOR]

Published
2004
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14. Recent results from the LHC inner iviplet quadrupole development program at fermilab

Author

Andreev, N., Arkan, T. T., Bauer, P., Bossert, R., Brandt, J., Chichili, D. R., Carson, I., Dimarco, J., Feher, S., Kerby, J., Lamm, M. J., Limon, P. J., Makarov, A., Nobrega, A., Novitski, I., Toru Ogitsu, Orris, D., Ozelis, J. P., Robotham, W., Sabbi, G., Schlabach, P., Strait, J., Tarraglta, M., Tompkins, J. C., Yadav, S., Zlobin, A. V., Caspi, S., Melnturff, A. D., Scanlan, R., and Ghosh, A.

15. Quench behavior of quadrupole model magnets for the LHC inner triplets at fermilab

Author

Andreev, N., Arkan, T., Bauer, P., Bessert, R., Brandt, J., Chichili, D. R., Carson, J., Dimarco, J., Feher, S., Glass, H., Kerby, J., Lamm, M. J., Makarov, A., Nobrega, A., Novitski, L., Ogitsu, T., Orris, D., Ozelis, J. P., Rabehl, R., Robouiam, W., GianLuca Sabbi, Schlabach, P., Sylvester, C., Strait, J., Tartaglia, M., Tompkiris, J. C., Yadav, S., Zlobin, A. V., Caspi, S., Mclnturff, A. D., Scanlan, R., and Ghosh, A.

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