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Preliminary Design for the Coupling Coil Cryostat in MICE

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Presentation on theme: "Preliminary Design for the Coupling Coil Cryostat in MICE"— Presentation transcript:

1 Preliminary Design for the Coupling Coil Cryostat in MICE
Institute of Cryogenics and Superconductivity Technology Harbin Institute of Technology P.R.China

2 The detailed calculations and numerical simulations are going on.
According to the “Technical Specification on MICE Coupling Solenoid Magnet Fabrication, Assembly, Test and Shipping”, ICST/HIT carried out the preliminary engineering design on the coupling magnet cryomodule since this August. The following persons have been involved in the current design in ICST. Dr. Lin X.Jia, Professor Dr. Li Wang, Professor Mr. C.S.Liu, Engineer Mr. G. Hang, Engineer H.Wu, Ph.D. candidate, numerical calculation L.K.Li, M.S. candidate, numerical calculation The detailed calculations and numerical simulations are going on.

3 The presented include:
Process flow diagram Cryostat Helium vessel Self-centered supports Current leads

4 Flow Diagram Cryo-cooler He compressor GHe storage tank LHe dewar
Coupling magnet cryomodule Vacuum pumping Cryo-cooler He compressor Flow Diagram

5 The precooling or test system is composed of
LHe dewar (250L, 500L available in ICST ) LN2 dewar (if necessary, 200L, 500L available in ICST ) GHe storage tank (5m3, 10m3 available in ICST ) He compressor Transfer lines Safety device (relief valves, rupture disc etc.) Valves Vacuum pumping system (available in ICST ) Cooling water system (available in ICST )

6 Schematic of coupling magnet precooling system

7 Cryostat The cryostat is composed of
Vacuum chamber made of stainless steel Radiation shield made of annealed OFHC copper Helium vessel made of stainless steel or 6061-T6 Aluminum Coil assembly consisting of NbTi/Cu SC conductors, bobbin, ground insulation, epoxy and support cylinder (or banding) Copper leads + HTS leads Supports LHe condenser Cryo-cooler Piping Bayonets and fittings Feedthroughs for temperature sensors, heater, level meter, voltage taps etc. Instrumentation including temperature sensors, heater, level meter, pressure transducers etc. MLI insulations and electrical insulations

8 Cryo-cooler Helium vessel Vacuum vessel LHe piping Cold-down supply piping Shields Supports VHe piping Cold-down return piping Vacuum port Feedthrough

9 Copper lead 1st stage cold head HTS lead 2nd stage cold head Eddy current interrupt slot Supports Flexible Cu strap Bayonet Piping to relief device Condenser

10 Up to the magnetic field distribution, the location of HTS leads and cryocooler will be changed.

11 Radiation shield is divided into four parts for assembly.

12 He vessel Bobbin Coil Support cylinder

13 Magnet cryostat components

14 Helium Vessel Option A Option B
A separated vessel to contain the coil assembly Coil is cooled either through conduction or directly by LHe Complex structure and assembly Directly made of coil bobbin, end plates and cover cylinder Coil is cooled through conduction Simple structure, but thick Al material needed

15 Two cooling schemes for Option B:
SS vessel wall Liquid helium SS Support cylinder Coil Ground insulation Al Bobbin 4.2K Helium vessel is made of stainless steel. The coil is cooled through conduction by liquid helium. SS thickness=15mm △Tcoil<0.1K Temperature distribution q-radiation=0.2W/m2

16 The coil is cooled directly by liquid helium.
4.2K The coil is cooled directly by liquid helium. q-radiation=0.2W/m2 △Tcoil<0.066K

17 Helium passage Bobbin Coil Support cylinder

18 The coil is cooled through conduction by liquid helium.
SS vessel wall Liquid helium Al Support cylinder Coil Ground insulation Al Bobbin 4.2K The coil is cooled through conduction by liquid helium. q-radiation=0.2W/m2 △Tcoil<0.1K

19 The coil is cooled directly by liquid helium.
4.2K The coil is cooled directly by liquid helium. q-radiation=0.2W/m2 △Tcoil<0.066K

20 Stress analysis for Option B: to consider the radial, longitudinal and gravity forces as well as the 4 bara pressure inside. 15mm SS in thickness Supports

21

22 To only consider the 4 bara pressure inside for SS helium vessel.

23 Option A: directly made of coil bobbin, end plates and cover cylinder
4.2K 6061-T6 Al 6061-T6 Al The coil is cooled through conduction by liquid helium. q-radiation=0.2W/m2 △Tcoil=0.04K Al thickness=25mm

24 Stress analysis for Option A: to consider the radial, longitudinal and gravity forces as well as the 4 bara pressure inside. 25mm Al in thickness Supports

25

26 To only consider the 4 bara pressure inside for Al helium vessel.

27 Self-centered Supports

28 Supports without 50K intercept
16mmx12.5mm, 175mmx2 G-10 band SS ~50K Supports without 50K intercept

29 Supports with 50K intercept

30 Heat loads from cold mass supports
Supports with 50K intercept Total 50K Cold Mass Support Heat Load (W) 4.2K Cold Mass Support Heat Load (W) Supports without 50K intercept Total Total Heat Leak from the Cold Mass Support (W) The structure and dimensions of the supports need to be further optimized.

31 Current leads The current lead for coupling coil consists of a conduction-cooled copper lead that carries current from room temperature to intercept temperature (the first stage of cryocooler) and a HTS lead that carries current from the intercept to the coil. Copper lead HTS lead

32 Design for Copper current leads
Energy equation: dz TL z Q+dQ Q I TH (1) (2) (3) Assuming: The optimized heat flow into the cold end of the lead: (4a) (5) (6a)

33 To apply Wiedemann-Franz law for most metal and alloy,
(4b) (6b)

34 For I=250A TL=50K, Qopt=11.563W TL=60K, Qopt=11.49W For I=220A TL=50K, Qopt=10.176W TL=60K, Qopt=10.112W

35 Parameters used for numerical simulation of the copper lead by FLUENT
Material RRR Nominal current Maximum Size D L pure copper 10 220A 250A 8mm 0.4m I=250A, D=8mm, L=0.4m, Q=14.27W

36 Temperature distribution along the copper lead at I=300A, D=8mm, L=0
Temperature distribution along the copper lead at I=300A, D=8mm, L=0.4m Q=15.245W

37 Temperature distribution along the copper lead at I=500A, D=8mm, L=0
Temperature distribution along the copper lead at I=500A, D=8mm, L=0.4m T-warm-end>300K

38 Temperature distribution along the copper lead at I=300A, D=8mm, L=0
Temperature distribution along the copper lead at I=300A, D=8mm, L=0.7m T-warm-end>300K

39 Parameters of HTS Current Leads
The nominal current for the HTS lead is 220A, and it must be capable of carrying 500A when the high-temperature end of the lead is nominally at 60K and at 1.5T. Type Outer Diameter (mm) Length (mm) Cross-section area ( mm2) Critical Current (A/77K) Silver contact length (mm) CSL-18/80.3 18.0 80 78 750 15 CSL-18/120.3 120 CSL-18/160.3 160 *Data from Sumitomo Electric Superconducting tubes of BiPbSrCaCuO (Bi-2223 phase) ceramics with silver covered ends of a low contact resistance are suitable for current leads effectively reducing heat leak into superconducting magnets. For better mechanical protection the leads may be encased in metal or G-10 tubing.

40

41 Heat loads from the current leads
Copper leads (300K-50K) I (A) L (mm) D (mm) Qopt (W) w/o current (L/A)opt (1/mm-1) Qreal (W) (L/A)real 300 400 8.00 13.876*2 8.587*2 11.781 15.245*2 12.712*2 7.958 27.752 17.174 30.49 25.424 250 11.563*2 7.156*2 14.137 14.27*2 10.527*2 9.610 23.126 14.312 28.54 21.054 HTS leads (50K-4.2K) L (mm) Do (mm) Thickness (mm) Q (W) 80 18.0 1.505 0.0573*2 120 0.0382*2 160 0.0286*2 Since the performance of HTS leads will be greatly influenced by the magnetic field, we should consider it while to select the commercial leads.

42 Winding Process Winding procedure and materials to be used need further detailed discussion.

43 The detailed further calculations and analyses are going on provided no change on the coil design such as the coil itself and its quench protection, vacuum vessel, supports, helium condenser, piping, safety device, instruments, interface to RF cavity module and so on.

44 ICST contribution summary up to date
Two professors (one half time and one quarter time) Two engineers (one and a half time) Two graduates (full time) ICST future possible contributions (year’07) Research fund $10k Three professors (two half time and one quarter time) Four engineers (full time) Three graduates (full time) Four mechanical/cryogenic technicians (full time)

45 THANK YOU

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