Spectrometer Solenoid Design

and

Procurement Review

MICE Collaboration Meeting October 10, 2006

Steve Virostek Mike Green Mike Zisman

Lawrence Berkeley National Lab

Spectrometer Solenoid Update

•Design review held by Wang NMR on Sept 6, 2006 Attendees: S. Virostek, M. Zisman, M. Green, D. Li Complete design package book provided by Wang Issues and actions items identified during review Follow up document from Wang addresses issues •Detailed magnet design is now complete •Superconducting wire sent from LBNL to Wang •Coil formers and high T

C leads ordered by Wang

•First magnet scheduled to be shipped end Aug 07 S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 2

He Filler Neck Cooler Neck Cold Mass Support Lead Neck Space for Radiation Shield PMT Iron Shield Support Stand

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 3

Lead Neck 4.2 K Coolers Gas Pipe Condenser Tank Cold Mass Liquid Pipe 4K End 60K Intercept 300K End

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 4

Magnet Coil Parameters

Parameter Coil length (mm) Coil inner radius (mm) Coil thickness (mm) Number of layers Number of turns per layer Coil overall current density (A mm Coil current I (A) Coil self inductance (H) Coil Stored Energy at I (MJ)

-

Š2 ) Match 1 201.2

258 44.7

42 120 142.19

253.7

12.8

0.41

Coil package length = 2530 mm Match 2 199.5

258 29.8

28 119 152.62

272.1

5.4

0.20

End 1 110.6

258 59.6

56 66 127.37

227.2

9.5* 0.25

Center 1314.3

258 21.3

20 784 152.44

272.2

41.4* 1.53

End 2 110.6

258 66.0

62 66 135.18

241.1

11.1* 0.32

Separately Powered Uniform Field Magnets * The uniform field magnet coils in series have a self inductance of 77 H

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 5

500 400 300 200 100 0 0

Magnet Coil Load Lines

T = 3.4 K T = 4.2 K T = 5.0 K Tracker M1 Tracker M2 Tracker E1 Tracker C Tracker E2 2 4 6 Magnet Peak B and Conductor B (T) 8

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 6

10

Design Overview (coil cooling)

•Indirect cooling using liquid helium condensers •Baseline design will use two cryocoolers but will

allow mounting of a third cooler, if necessary

•Cryocoolers and high T

C leads will be accessible by means of removable cover plates

•60K (or less) thermal shield is conductively

cooled using the first stage of the cryocoolers

•Thermal shield nitrogen reservoir will protect the

high T C leads and provide extra cooling margin

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 7

Design Overview (coil construction)

•Single piece 6061-T6 aluminum coil former •Each layer wet wound using Stycast 2850 FT •2.5 mil thick fiberglass between winding layers •Aluminum coil banding will provide hoop force

support and ensure coils are tight after cooldown

•Conductor joints are to be lapped by at least 24”

to minimize the I 2 R losses

•Passive quench protection will be provided by a

system of diodes & resistors

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 8

Design Overview (PV’s

&

supports)

•Helium vessel (Al) and vacuum vessel (304SS) to

be designed & tested according to PV code

•He vessel will contain two relief paths for safety •Unidirectional S-2 fiberglass cold mass supports

using race-track shaped links (safety factor of 4)

•304 SS support design derived from LBNL/Oxford •Cold mass support design allows cold shipping •TBD: lifting accommodations and base mounting S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 9

Cryocooler Procurement

•Two cryocoolers are needed at Wang NMR by the

end of Feb 2007 for installation into first magnet

•Two additional coolers needed one month later •13 week lead time after placement of order •Two coolers per magnet anticipated for operation •Magnets designed to mount up to three coolers •Two more coolers to be procured at a later date •Short procurement spec to be done by M. Green S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 10

Power Supply Procurement

•First draft of power supply procurement spec is

being reviewed by collaboration members

•Three 300 A and two 50 A supplies are needed for

magnet operation and for testing @ FNAL

•One spare of each supply allows parallel testing

of first (@FNAL) & second (@Wang) magnets

•Lead time to procure power supplies is 3 months •First supply needed May 07 for testing at Wang S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 11

Summary of Wang Analyses

•On-axis field profile and peak field on conductor •Axial forces and axial magnetic pressure calcs •Evaluation of fringe fields on leads

& cryocoolers

•3-D magnet quench analyses (w/o Al bore tube) •Heat leak calculations (thermal shield, He vessel) •Calculation of cooldown cryogen requirements •FEA stress analysis of coils and coil former •ASME code calculations for He

& vacuum vessels

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 12

Other Project Documents

•Magnet Construction Quality Assurance Plan •Fabrication/installation/inspection plans: coil former, ground insulation, coil winding, coil banding quench protection, conductor feed thrus, coil assembly He vessel, cold mass support, He recondenser, Hi-T C thermal shield, vacuum vessel, support structure leads •Winding instructions for each coil •Project work breakdown structure and schedule •Detailed component and assembly drawings S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 13

Schedule Summary

Task Description Place Magnet Order with Wang NMR (LBNL) Complete Magnet System Design Write QC/QA Administration & Test Report Procure & Deliver Superconductor to Wang (LBNL) Conduct Magnet Design Review Procure Coil Formers from Subcontractor Write Spec and Procure High T c Leads Write Spec and Procure Cryocoolers (LBNL) Write Spec and Procure Power Supplies (LBNL) Wind Coils on Coil Formers Assemble and Leak Check He Shell Install Superinsulation and Cold Mass Supports Install Hi-Tc Leads, Recondensers & Cryocoolers Leak Checks, Cooldown & Acceptance Tests Ship Magnets 2006 2007 Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 14

Summary

•Detailed magnet design is now complete •Coil formers and high T

C

leads ordered

•Superconducting wire delivered to Wang •Cryocooler order to be placed soon (~1 mo) •Power supply spec is nearly complete •First magnet to be shipped by end Aug 07 •Second magnet to follow 1 month later S. Virostek, M. Green, M. Zisman - Lawrence Berkeley Lab Spectrometer Solenoid Design & Procurement Page 15