# BNL FNAL LBNL SLAC TQ Thermal Model Dariusz

• Slides: 7

BNL - FNAL - LBNL - SLAC TQ Thermal Model Dariusz Bocian I would like to thank people who have shared their data and helped during the course of this work: G. Ambrosio, R. Bossert, G. Chalidze, H. Felice, P. Ferracin, A. Hafalia, V. Kashikhin, HQ meeting, February 10, 2011

OUTLINE TQ modeling Input data Jc -> temperature margin calculation Coil geometry – needed for fine tuning of model Heat conductivity data Measurements on TQ coil #15 (MJR coil) Questions What is actual thickness of insulations? Can we cut MJR coil 10/12 and RRP coil 17/19 Dariusz Bocian 2

TQ model Heat transfer in the Nb 3 Sn magnets is determined by cable and coil insulation thickness In order to fine tuning of thermal model precise data are required. For example: 10 mils inner MJR coil insulation consist of Kapton and epoxy-impregnated S-2 glass. Increasing thickness of Kapton by 1. 5 mils (from 1. 5 to 3 mils) causing increase of cable temperature by 1 K (data taken for 45 W/m midplane heat load). Also radial vs. azimuthal insulation thickness defines radial and azimuthal heat flow paths in the magnet coil. Dariusz Bocian TQ Termal Model 3

Measurements – TQ coil #15 10 mils 16 mils 27 -30 mils 10 mils Dariusz Bocian TQ Termal Model 4

Measurements – TQ coil #15 9. 5 -10. 0 mils 15. 6 mils 14. 8 mils Dariusz Bocian 15. 6 mils TQ Termal Model 5

Measurements – TQ coil #15 18. 5 mils 27 -30 mils 16 mils Dariusz Bocian TQ Termal Model 6

Questions Where to find precise coil/cable insulation data? Can coil 10/12 and 17/19 can be cutted for precise Dariusz Bocian TQ Termal Model 7