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MICE RF Coupling Coil Magnets Update Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory October 6, 2010 Sofia, Bulgaria.

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Presentation on theme: "MICE RF Coupling Coil Magnets Update Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory October 6, 2010 Sofia, Bulgaria."— Presentation transcript:

1 MICE RF Coupling Coil Magnets Update Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory October 6, 2010 Sofia, Bulgaria

2 Acknowledgements LBNL, HIT MICE team members In particular SINAP MICE team members Lixin YIN, Li WANG, Yun CAO and Sen SUN Most of the work in this presentation are from them

3 Summary Overview of the MICE CC fabrication plan Overview of the MICE CC fabrication plan – Organization and responsibilities Coil winding status at Qi Huan Corp. Coil winding status at Qi Huan Corp. – 1 st MuCool coil winding ~ 50% finished MICE CC Cryostat design review at SINAP (Shanghai INstitute of Applied Physics) MICE CC Cryostat design review at SINAP (Shanghai INstitute of Applied Physics) – Held at SINAP, October 13-14, 2010 – Updates of major (proposed) changes of the updated design Update from HIT (Harbin Institute of Technology) Update from HIT (Harbin Institute of Technology) ICST test system ICST test system Welding of cold-mass cover plate Welding of cold-mass cover plate Schedule and near term plans Schedule and near term plans Updated schedule Updated schedule 3 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010

4 Overview of CC Fabrication Plan Organization and responsibilities Organization and responsibilities – LBNL responsible for MICE CC magnets, HIT responsible for the design and fabrication, in collaboration with LBNL – Recent responsibility changes LBNL responsible for the cryostat design, in collaboration with SINAP (under US-China HEP Collaboration Agreement); an updated addendum signed between LBNL and HIT in early-August 2010 LBNL responsible for the cryostat design, in collaboration with SINAP (under US-China HEP Collaboration Agreement); an updated addendum signed between LBNL and HIT in early-August 2010 HIT oversee the fabrication with assistance from LBNL HIT oversee the fabrication with assistance from LBNL – ICST test system – Cover plate welding of the cold-mass CC fabrication at Qi Huan Corp., Beijing CC fabrication at Qi Huan Corp., Beijing – Fabrication contract signed mid-March 2010 – 1 1st MuCool coil winding started early-July 2010, now  50% finished 4 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010

5 Coil Winding at Qi Huan Corp. 1 st coil winding started early-July 2010 1 st coil winding started early-July 2010 50% complete now 50% complete now 12 SC wire joints, wire width variations 12 SC wire joints, wire width variations Average 2 layers/day (166 turns x 96 layers) Average 2 layers/day (166 turns x 96 layers) Expected to complete by end of Nov. 2010 Expected to complete by end of Nov. 2010 Cold-mass cover plate welding contract Cold-mass cover plate welding contract signed mid-August 2010 at HIT signed mid-August 2010 at HIT 5 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010

6 6 Update from Qi Huan Corp. Coil winding SC wire defect at 50 th turn and 37 th layer SC wire joint Coil winding log

7 MICE CC Cryostat Design Review 7 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 The review was held from Sept. 13 to 14, 2010 at SINAP The review was held from Sept. 13 to 14, 2010 at SINAP Review Committee was chaired by Prof. Alan Bross and report coming soon Review Committee was chaired by Prof. Alan Bross and report coming soon Review charges and areas: Review charges and areas: o Validity of overall cryostat design o Does the 3 cryo-cooler design provide sufficiently low heat load to the cold mass to allow stable operation? o Are the final assembly procedures defined? o How will the cold-mass reference position be transferred to external survey markers? o Does the mechanical design allow for repairs? o Cooling circuit update o Instrumentation/diagnostic sensors (temperature and LHe level) o The design for quench protection system (concerns) o HIT test system and cold-mass cover plate welding

8 The Cryostat Design Update 8 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 An updated cryostat design was presented by SINAP MICE team An updated cryostat design was presented by SINAP MICE team The updated design significantly improves to the performance The updated design significantly improves to the performance Three cryo-coolers as base Three cryo-coolers as base More robust and temperature margin More robust and temperature margin Easier for assembly Easier for assembly Easier access for future repair and adjustment Easier access for future repair and adjustment A direct method to reference cold mass position to outside survey fiducial A direct method to reference cold mass position to outside survey fiducial Improved cooling circuit Improved cooling circuit

9 Major Changes in Cryostat 9 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 New Old All proposed changes have been supported and confirmed by relevant FEA simulations

10 Cooling Circuit Updates 10 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 Gas He vent line LHe supply line for cold down Burst disc vent line Coiled heat exchanger LHe level sensor tube old GHe vent

11 Power Leads and Cooling 11 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 Updated design Previous design

12 Assembly and Interface Many interface issues Many interface issues Preliminary progresses Preliminary progresses Assembly procedures Assembly procedures Supporting structures Supporting structures 12 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010

13 RF Coupler Region Issue: extremely tight space in RF coupler region for MLI and difficult for assembly Issue: extremely tight space in RF coupler region for MLI and difficult for assembly Proposed solutions: Proposed solutions: – Reduce RF coupler from 4 1/16 to 3 1/8:  0.5 cm more space – Make RFCC module slight longer and keep the RF coupler dimensions 13 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010

14 Modification of RF Couplers Proposed solutions: Proposed solutions: – Reduce RF coupler from 4 1/16 to 3 1/8:  0.5 cm more space 14 MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 3 1/8” Coupler 4 1/16” Coupler

15 Update from HIT ICST test system: system disassembled ICST test system: system disassembled – Transfer line contamination – New transfer line ordered – System ready by end Nov. 2010 Cold-mass cover plate Cold-mass cover plate welding welding – Test sample made – Welding fixture in progress (with help from LBNL) (with help from LBNL) MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 15

16 Near Term Plan and Schedule Finish the 1 st coil winding by end of November 2010 Finish the 1 st coil winding by end of November 2010 Finish ICST test system by end of November 2010 Finish ICST test system by end of November 2010 Cold-mass cover plate welding Cold-mass cover plate welding Continue updating the CC cryostat design Continue updating the CC cryostat design – More FEA simulations required on the cryostat vessel – Cooling circuit need to be further reviewed by experts or simulations Air-plug Air-plug – Quench protection also need to be reviewed – Interface with RF cavities and RFCC vacuum vessel – Technical discussions between SINAP MICE team and Qi Huan Corp. (received permission from HIT) A final design review on the CC cryostat design is required to happen soon before submitting MICE TB for approval A final design review on the CC cryostat design is required to happen soon before submitting MICE TB for approval – Can we combine two reviews? 3D, 2D drawings and fabrication of the cryostat 3D, 2D drawings and fabrication of the cryostat MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 16

17 Updated CC Schedule MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 17

18 Progress after the Review MICE CC Updates, D. Li, Lawrence Berkeley National Lab, October 6, 2010 18 Vacuum port: ID is changed from 40mm to 100mm. Welding with cut-away redundancy instead of flange connection Angle changes of gussets in order to avoid interference with RF cavity vacuum vessel Inside supports to reduce local deformation and peak stress of CC vacuum vessel resulting from the upper 4 cold mass supports

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