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1,277 results on '"Caspi S"'

251. Quadrupole magnets for the SSC

Author

Lietzke, A.F., Barale, P., Benjegerdes, R., Caspi, S., Cortella, J., Dell'Orco, D., Gilbert, W., Green, M.I., Mirk, K., Peters, C., Scanlan, R., Taylor, C.E., and Wandesforde, A.

Subjects
Superconducting magnets -- Research, Magnetic fusion -- Research, Business, Electronics, Electronics and electrical industries, Superconducting Super Collider -- Research
Abstract

The Lawrence Berkeley Laboratory in California has a program to develop quadrupole magnets for the superconducting super collider. So far, it has fabricated ten model magnets using kapton-insulated niobium titanium superconducting cables. These include four 1-m long and six 5-m long prototypes. Test runs to validate the magnets's design show the magnet to have insufficient end-clamping and pole shimming.

Published
1993

253. Summary of HQ01e magnetic measurements

Author

Wang, X., primary, Caspi, S., additional, Cheng, D. W., additional, Dietderich, D. R., additional, Felice, H., additional, Ferracin, P., additional, Godeke, A., additional, Hafalia, A.R., additional, Joseph, J. M., additional, Lizarazo, J., additional, Marchevsky, M., additional, Sabbi, G. L., additional, Ghosh, A., additional, Schmalzle, J., additional, Wanderer, P., additional, Ambrosio, G., additional, Bossert, R., additional, Chlachidze, G., additional, DiMarco, J., additional, Zlobin, A.V., additional, Milanese, A., additional, and Todesco, E., additional

Published
2011
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254. Design and fabrication of a high aspect ratio cable for a high gradient quadrupole magnet

Author

Scanlan, R.M., McInturff, A.D., Taylor, C.E., Caspi, S., Dell'Orco, D., Higley, H., Gourlay, S., Bossert, R., Brandt, J., and Zlobin, A.V.

Subjects
Electrical cables -- Research, Superconducting magnets -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A two-layer magnet with a high aspect ratio cable was developed. It was designed to meet the quadrupole, gradient and cooling requirements of the Large Hadron Collider. The cable employs optimized superconducting inner and outer layer strands. Cable design parameters include width of 15.2 mm, with inner cables having 38 strands of 0.8 mm diameter wire and 0.99-degree keystone angle.

Published
1997

255. Superfluid transport and its applications in space

Author

Yuan, S. W. K, Lee, J. M, Caspi, S, Soloski, S. C, and Vote, F. C

Subjects
Engineering (General)
Abstract

Various transport modes in superfluid helium are discussed. They include zero net mass flow and finite mass flow for pure superfluid and normal fluid flow. An attempt is made to characterize these transport modes in a common frame of reference. Two dimensionless numbers are used, namely, the dimensionless heat flux number and the dimensionless driving force number. The equations are generalized by the use of a characteristic length so that they can be applied to the transport of HE II in any geometry. The theories are then extended to applications in space. In particular, fountain effect pumps and superfluid management at zero g by vapor-liquid phase separators are discussed in detail.

Published
1990
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256. The neutrino factory and beta beam experiments and development

Author

Albright, C., primary, Barger, V., additional, Beacom, J.F., additional, Berg, J.S., additional, Black, E., additional, Blondel, A., additional, Bogacz, S., additional, Brice, S., additional, Caspi, S., additional, Chou, W., additional, Cummings, M., additional, Fernow, R., additional, Finley, D., additional, Gallardo, J., additional, Geer, S., additional, Gomez-Cadenas, J.J., additional, Goodman, M., additional, Harris, D., additional, Huber, Patrick, additional, Jansson, A., additional, and Johnstone, C., additional

Published
2004
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259. A 6.4 Tesla Dipole Magnet For the SSC

Author

Taylor, C. E., Caspi, S., Gilbert, W., Hassenzahl, W., Meuser, R., Mirk, K., Peters, C., Scanlan, R., Dahl, P., Cottingham, J., Fernow, R., Garber, M., Ghosh, A., Goodzeit, C., Greene, A., Herrera, J., Kahn, S., Kelly, E., Morgan, G., Prodell, A., Sampson, W., Schneider, W., Shutt, R., Thompson, P., Wanderer, P., Willen, E., and Fast, R. W., editor

Published
1986
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261. Quench Start Localization in Full-Length SSC R&D Dipoles

Author

Devred, A., Chapman, M., Cortella, J., Desportes, A., Kaugerts, J., Kirk, T., Mirk, K., Schermer, R., Tompkins, J. C., Turner, J., Cottingham, J. G., Dahl, P., Garber, M., Ganetis, G., Ghosh, A., Goodzeit, C., Greene, A., Herrera, J., Kahn, S., Kelly, E., Morgan, G., Prodell, A., Rohrer, E. P., Sampson, W., Shutt, R., Thompson, P., Wanderer, P., Willen, E., Bleadon, M., Brown, B. C., Hanft, R., Kuchnir, M., Lamm, M., Mantsch, P., Mazur, P. O., Orris, D., Peoples, J., Strait, J., Tool, G., Caspi, S., Gilbert, W., Meuser, R., Peters, C., Rechen, J., Royet, J., Scanlan, R., Taylor, C., Zbasnik, J., and McAshan, Michael, editor

Published
1989
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262. Performance Of Full-Length SCC Model Dipoles: Results From 1988 Tests

Author

Tompkins, J., Chapman, M., Cortella, J., Desportes, A., Devred, A., Kaugerts, J., Kirk, T., Mirk, K., Schermer, R., Turner, J., Cottingham, J. G., Dahl, P., Garber, M., Ganetis, G., Ghosh, A., Goodzeit, C., Greene, A., Herrera, J., Kahn, S., Kelly, E., Morgan, G., Prodell, A., Rohrer, E. P., Sampson, W., Shutt, R., Thompson, P., Wanderer, P., Willen, E., Bleadon, M., Brown, B. C., Hanft, R., Kuchnir, M., Lamm, M., Mantsch, P., Mazur, P. O., Orris, D., Peoples, J., Strait, J., Tool, G., Caspi, S., Gilbert, W., Meuser, R., Peters, C., Rechen, J., Royet, J., Scanlan, R., Taylor, C., Zbasnik, J., and McAshan, Michael, editor

Published
1989
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266. Conceptual design of the Fermilab Nb3Sn high field dipole model

Author

Ambrosio, G., primary, Andreev, N., additional, Arkan, T., additional, Barzi, E., additional, Chichili, D., additional, Kashikhin, V., additional, Limon, P., additional, Ogitsu, T., additional, Ozelis, J., additional, Terechkine, I., additional, Tompkins, J., additional, Yadav, S., additional, Yamada, R., additional, Yarba, V., additional, Zlobin, A., additional, Caspi, S., additional, and Wake, M., additional

Published
1999
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269. EPAC/LHC Magnet Papers

Author

Ambrosio, G., primary, Ametrano, F. M., additional, Broggi, F., additional, Andreev, N., additional, Artoos, K., additional, Begg, M., additional, Bellomo, G., additional, Bottura, L., additional, Bossert, R., additional, Baynham, E., additional, Caspi, S., additional, Clee, P., additional, Coombs, R., additional, Dell'orco, D., additional, Evans, D., additional, Feher, S., additional, Ferrari, A., additional, Faus-Golfe, A., additional, Gourlay, S. A., additional, Heger, T., additional, Gupta, R. C., additional, Huang, Y., additional, Ijspeert, A., additional, Karppinen, M., additional, Kirby, G., additional, Kerby, J., additional, Landgrebe, D., additional, Leroy, D., additional, Lamm, M. J., additional, Limon, P. J., additional, Lietzke, A., additional, Mazur, P. O., additional, Mokhov, N., additional, McInturff, A. D., additional, Nicol, T., additional, Nobrega, F., additional, Orris, D., additional, Ozelis, J. P., additional, Ostojic, R., additional, Oberli, L., additional, Ostler, J., additional, Peterson, T., additional, Perini, D., additional, Poncet, A., additional, Perin, R., additional, Rossi, L., additional, Rodrigues-Mateos, F., additional, Russenchuck, S., additional, Siambanis, T., additional, Siegel, N., additional, Siemko, A., additional, Schlabach, P., additional, Strait, J., additional, Scanlan, R., additional, Sabbi, G., additional, Salminen, J., additional, Tommasini, D., additional, Trinquart, G., additional, Tompkins, J., additional, Taylor, T. M., additional, Van Oort, J. M., additional, Vanekov, I., additional, Verdier, A., additional, Walckiers, L., additional, Weterings, W., additional, Wolf, R., additional, Zlobin, A., additional, Milward, S. R., additional, Nobes, S., additional, Smith, K. D., additional, Street, A. J., additional, Townsend, M. C., additional, Treadgold, J. R., additional, Wiatrzyk, J. M., additional, and Puntambekar, Avinash, additional

Published
1996
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275. Nb[subscript 3]Sn quadrupole magnets for the LHC IR

Author

Sabbi, G., Caspi, S., Chiesa, L., Coccoli, M., Dietderich, D.R., Ferracin, P., Gourlay, S.A., Hafalia, R.R., Lietzke, A.F., McInturff, A.D., and Scanlan, R.M.

Subjects
Particle accelerators -- Research, Superconducting magnets -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Nb[subscript 3]Sn quadrupole magnets for second generation LHC IR are described and discussed.

Published
2003

280. SSC Quadrupole Magnet Performance at LBL

Author

Lietzke, A.F., primary, Barale, P., additional, Benjegerdes, r., additional, Caspi, S., additional, Cortella, J., additional, Dell'Orco, D., additional, Gilbert, W., additional, Green, M.I., additional, Mirk, K., additional, Peters, C., additional, Scalan, R., additional, Taylor, C.E., additional, and Wandesforde, A., additional

Published
1992
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290. CHATS on Applied Superconductivity, 2006. September 5-7, 2006, Lawrence Berkeley National Laboratory, Berkeley, USA

Author

Caspi, S, Caspi, S, Ferracin, P, Prestemon, S, Caspi, S, Caspi, S, Ferracin, P, and Prestemon, S

Abstract

CHATS-AS workshop has been organized to discuss applied superconductivity at the Lawrence Berkeley National Laboratory (LBNL), Berkeley, USA, on September 5-7, 2006. The workshop provided an ongoing opportunity to discuss and advance the science of simulations and modeling specifically applied to superconducting magnets. CHATS-AS 2006 has contributed to the development and refinement of models used to study the stability of superconductors, simulate quench propagation, and perform structural analysis of superconducting magnets. A number of presentations provided significant advances in measuring and modeling current sharing and contact resistances between superconducting strands in CHATS-AS workshops. The workshop included both LTS and HTS applications, extending the LTS experience in modeling superconducting devices to the realm of HTS applications.

Published
2007

292. Measured Strain of Nb3Sn Coils During Excitation and Quench

Author

Caspi, S., Caspi, S., Bartlett, S.E., Dietderich, D.R., Ferracin, P., Gourlay, S.A., Hannaford, C.R., Hafalia, A.R., Lietzke, S., Mattafirri, M., Nyman, M., Sabbi, G., Caspi, S., Caspi, S., Bartlett, S.E., Dietderich, D.R., Ferracin, P., Gourlay, S.A., Hannaford, C.R., Hafalia, A.R., Lietzke, S., Mattafirri, M., Nyman, M., and Sabbi, G.

Published
2005

294. Protection Heater Delay Time Optimization for High-Field Nb3Sn Accelerator Magnets

Author

Salmi, T, Ambrosio, G, Caspi, S, Chlachidze, G, Felice, H, Marchevsky, M, Prestemon, S, and Ten Kate, HHJ

Subjects
thermal modeling, General Physics, Physics::Medical Physics, Protection heaters, superconducting magnet design, Materials Engineering, Electrical and Electronic Engineering, quench protection, Condensed Matter Physics, Computer Science::Other
Abstract

The US LARP collaboration has been pursuing the development of Nb3Sn technology for the interaction region low-beta quadrupole magnets for the future LHC luminosity upgrade. A key component for safe operation of these high-field magnets is the quench protection system. Due to the high stored energy density and the low stabilizer fraction in the conductor, quench propagation in the windings needs to be accelerated to limit the hot spot temperature and coil internal voltages during a quench. For this purpose, quench protection heaters are used to introduce multiple quenches across the windings. Heater delay, i.e. the time delay between heater activation and normal zone initiation under the heater, is a critical design parameter. We present an analysis of the heater delays characteristics for Nb3Sn coil windings based on our recently developed Code for Heater Delay Analysis (CoHDA), and compare with experimental results for various operational currents and temperatures in the LARP HQ and LQ magnets. We demonstrate applicability of our simulation model for heater design optimization of the LHC type low-beta quadrupole coils.

Published
2014

295. Protection Heater Delay Time Optimization for High-Field $\hbox{Nb}_{3}\hbox{Sn}$ Accelerator Magnets

Author

Salmi, T, Ambrosio, G, Caspi, S, Chlachidze, G, Felice, H, Marchevsky, M, Prestemon, S, and Kate, HHJ ten

Subjects
thermal modeling, General Physics, Protection heaters, superconducting magnet design, Materials Engineering, Electrical and Electronic Engineering, quench protection, Condensed Matter Physics
Abstract

The US LARP collaboration has been pursuing the development of Nb3Sn technology for the interaction region low-beta quadrupole magnets for the future LHC luminosity upgrade. A key component for safe operation of these high-field magnets is the quench protection system. Due to the high stored energy density and the low stabilizer fraction in the conductor, quench propagation in the windings needs to be accelerated to limit the hot spot temperature and coil internal voltages during a quench. For this purpose, quench protection heaters are used to introduce multiple quenches across the windings. Heater delay, i.e. the time delay between heater activation and normal zone initiation under the heater, is a critical design parameter. We present an analysis of the heater delays characteristics for Nb3Sn coil windings based on our recently developed Code for Heater Delay Analysis (CoHDA), and compare with experimental results for various operational currents and temperatures in the LARP HQ and LQ magnets. We demonstrate applicability of our simulation model for heater design optimization of the LHC type low-beta quadrupole coils.

Published
2014

296. Measured strain of a Nb3Sn coil during excitation and quench

Author

Caspi, S., 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., Sabbi, G., Caspi, S., 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.

Published
2004

297. Calculating quench propagation with ANSYS®

Author

Caspi, S, Caspi, S, Chiesa, L, Ferracin, P, Gourlay, SA, Hafalia, R, Hinkins, R, Lietzke, AF, Prestemon, S, Caspi, S, Caspi, S, Chiesa, L, Ferracin, P, Gourlay, SA, Hafalia, R, Hinkins, R, Lietzke, AF, and Prestemon, S

Abstract

A commercial Finite-Element-Analysis program, ANSYS®, is widely used in structural and thermal analysis. With the program's ability to include nonlinear material properties and import complex CAD files, one can generate coil geometries and simulate quench propagation in superconducting magnets. A "proof-of-principle" finite element model was developed assuming a resistivity that increases linearly from zero to its normal value at a temperature consistent with the assumed B magnetic field. More sophisticated models could easily include finer-grained coil, cable, structural, and circuit details. A quench is provoked by raising the temperature of an arbitrary superconducting element above its Tc. The time response to this perturbation is calculated using small time-steps to allow convergence between steps. Snapshots of the temperature and voltage distributions allow examination of longitudinal and turn-to-turn quench propagation, quench-front annihilation, and cryo-stability. Modeling details are discussed, and a computed voltage history was compared with measurements from a recent magnet test.

Published
2003

298. Mechanical Design of a Second Generation LHC IR Quadrupole

Author

Caspi, S., Caspi, S., Bartlett, S.E., Dietderich, D.R., Ferracin, P., Gourlay, S.A., Hafalia, R.R., Hannaford, C.R., Lietzke, A.F., McInturff, A.D., Sabbi, G., Scanlan, R.M., Caspi, S., Caspi, S., Bartlett, S.E., Dietderich, D.R., Ferracin, P., Gourlay, S.A., Hafalia, R.R., Hannaford, C.R., Lietzke, A.F., McInturff, A.D., Sabbi, G., and Scanlan, R.M.

Published
2003

300. An update on the Axion Helioscopes front: current activities at CAST and the IAXO project

Author

Dafni, T., primary, Arik, M., additional, Armengaud, E., additional, Aune, S., additional, Avignone, F.T., additional, Barth, K., additional, Belov, A., additional, Betz, M., additional, Bräuninger, H., additional, Brax, P., additional, Breijnholt, N., additional, Brun, P., additional, Cantatore, G., additional, Carmona, J.M., additional, Carosi, G.P., additional, Caspers, F., additional, Caspi, S., additional, Cetin, S.A., additional, Chelouche, D., additional, Christensen, F.E., additional, Collar, J.I., additional, Dael, A., additional, Davenport, M., additional, Derbin, A.V., additional, Desch, K., additional, Diago, A., additional, Döbrich, B., additional, Dratchnev, I., additional, Dudarev, A., additional, Eleftheriadis, C., additional, Fanourakis, G., additional, Ferrer-Ribas, E., additional, Friedrich, P., additional, Galán, J., additional, García, J.A., additional, Gardikiotis, A., additional, Garza, J.G., additional, Gazis, E.N., additional, Georgiopoulou, E., additional, Geralis, T., additional, Gimeno, B., additional, Giomataris, I., additional, Gninenko, S., additional, Gómez, H., additional, González-Díaz, D., additional, Gruber, E., additional, Guendelman, E., additional, Guthörl, T., additional, Hailey, C.J., additional, Hartmann, R., additional, Hauf, S., additional, Haug, F., additional, Hasinoff, M.D., additional, Hiramatsu, T., additional, Hoffmann, D.H.H., additional, Horns, D., additional, Iguaz, F.J., additional, Irastorza, I.G., additional, Isern, J., additional, Imai, K., additional, Jacoby, J., additional, Jaeckel, J., additional, Jakobsen, A.C., additional, Jakovčić, K., additional, Kaminski, J., additional, Kawasaki, M., additional, Karuza, M., additional, Königsmann, K., additional, Kotthaus, R., additional, Krčmar, M., additional, Kousouris, K., additional, Krieger, C., additional, Kuster, M., additional, Lakić, B., additional, Laurent, J.M., additional, Limousin, O., additional, Lindner, A., additional, Liolios, A., additional, Ljubičić, A., additional, Luzón, G., additional, Matsuki, S., additional, Muratova, V.N., additional, Neff, S., additional, Niinikoski, T., additional, Nones, C., additional, Ortega, I., additional, Papaevangelou, T., additional, Pivovaroff, M.J., additional, Raffelt, G., additional, Redondo, J., additional, Riege, H., additional, Ringwald, A., additional, Rodríguez, A., additional, Rosu, M., additional, Russenschuck, S., additional, Ruz, J., additional, Saikawa, K., additional, Savvidis, I., additional, Sekiguchi, T., additional, Semertzidis, Y.K., additional, Shilon, I., additional, Sikivie, P., additional, Silva, H., additional, Solanki, S.K., additional, Stewart, L., additional, ten Kate, H.H.J., additional, Tomas, A., additional, Troitsky, S., additional, Vafeiadis, T., additional, van Bibber, K., additional, Vedrine, P., additional, Villar, J.A., additional, Vogel, J.K., additional, Walckiers, L., additional, Weltman, A., additional, Wester, W., additional, Yildiz, S.C., additional, and Zioutas, K., additional

Published
2016
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