Magnet Systems. Jim Kerby 20 Apr 2007 With thanks to my colleagues. Current Program. Current focus: Demonstrate by the end of 2009 that Nb 3 Sn magnets are a viable choice for an LHC IR upgrade Known major issues Nb3Sn technology; Peak field on coil; Length; Consistency
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20 Apr 2007
With thanks to my colleagues
Current focus: Demonstrate by the end of 2009 that Nb3Sn magnets are a viable choice for an LHC IR upgrade
Three pronged approach:
But several new initiatives are under discussion—slim Q0 options, for instance—we can not be completely locked in the box, and must be willing to contribute in the best way possible for LHC
 T. Sen et al, PAC-01
 A. Zlobin et al., EPAC 02
 G. Sabbi et al., ASC-02
 R. Bossert et al., ASC-06
 S. Caspi et al., ASC-06
 G. Ambrosio et al., ASC-06
 LHC Design Report
 R. Ostojic et al., PAC-05
 S. Caspi et al, MT-15
Quadrupole Designs for the LHC IR
From ASC06 HQ Paper
TQC and TQS Design Concepts
TQC01 and TQS01 Quench Training
TQS01b & TQS01c Test Results
Field quality analysis:
First TQ models show that the random coil block displacements are mostly within ± 50 microns which is factor of three larger than in production MQXB at the same fraction of coil aperture. This is an encouraging result given the differences between NbTi and Nb3Sn technologies and the fact that MQXB field quality was polished on many preceding short models.The measurements reveal opposite ramp-rate dependences in TQC01 and TQS01 transfer functions that may be related to different interstrand contact resistances.
TQ Next Steps
LQ Status & Plans
Goal: 4m long, G 200 T/m, F = 90 mm
1st LONG RACETRACK
With Al shell
Analysis of TQC with Ti coils: OK!
Hybrid concepts: SS shell + bladders
HQ Status & Plans
Collar and pole locked with a key
Collar and pad locked with a key
Summary of mechanical analysis
Model1= coil#i pole#i glued
20 MPa tension between pole and coil
Goal: Develop insulation/impregnation scheme that can withstand the expected dose at Max luminosity
Rad-Hard Insulation Workshop
Fermilab, April 20, 2007 (1:30 – 6:00 pm)
The result: robust insulation fabric with half the conventional thickness:
The silane sizing is stable through Nb3Sn heat treatment.
The tight weave (80 ct) is strong and flexible, no broken yarns, no Cu show through
Conformation with cable is excellent, promotes easy coil winding.
Silane survives heat treat, provides enhanced bonding with epoxy in final coil.
New insulation has 20% higher shear strength!
Good electrical properties
We could coordinate materials and braiding process to make this new direct-braid insulation available to be applied to cable for LARP magnets.
Question: are you (we) interested?
New initiatives and participation…welcome!
Magnet tests exploring the phase space…as upgrades become more real, we will be able to suggest real phase space to operate in.
Proposal for new strand made….options for larger diameter as required
Continued R&D and studies on materials and cooling to make a real upgrade of LHC
Thanks to all collaborators on an active and open meeting!