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Spectrometer Solenoid Design and Test Results Steve Virostek Lawrence Berkeley National Lab Spectrometer Solenoid Review November 18, 2009.

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Presentation on theme: "Spectrometer Solenoid Design and Test Results Steve Virostek Lawrence Berkeley National Lab Spectrometer Solenoid Review November 18, 2009."— Presentation transcript:

1 Spectrometer Solenoid Design and Test Results Steve Virostek Lawrence Berkeley National Lab Spectrometer Solenoid Review November 18, 2009

2 MICE Spectrometer Solenoid Design and Test ResultsPage 2 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 MICE Cooling Channel Layout

3 MICE Spectrometer Solenoid Design and Test ResultsPage 3 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 1 design features Magnet 1 testing results Modifications for Magnet 2 Magnet 2 test results Photos for discussion Topics

4 MICE Spectrometer Solenoid Design and Test ResultsPage 4 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 1 Original Design LHe lines Radiation shield Cold mass Vapor return lines Cold head 2 nd stage Cold head 1 st stage

5 MICE Spectrometer Solenoid Design and Test ResultsPage 5 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Temperature Sensor Locations TPR: platinum resistorTRX: CernoxHTR: heater TSD: silicon diodeVTM: voltage tap

6 Magnet cold mass was successfully cooled down to <5K using a combination of LN and LHe Cool down of the shield was very slow as there was no direct connection to the LN (i.e. shield cooling by radiation and conduction thru cold mass suppts only) LHe was boiling off from cold mass at a high rate Helium was not being condensed at all by the coolers Since the magnet was cold, an attempt was made to train the coils MICE Spectrometer Solenoid Design and Test ResultsPage 6 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 1 Testing Results

7 The training reached 196 A in all coils (270 A needed to reach 4 T in the central coil) Magnet training was discontinued when the available cryogens ran out and so modifications could begin Based on measurements and observations, the coolers were not maintaining the LHe level, and the shield temperature was ~120 K rather than the specified 80 K These two issues were due to the thermal siphon line being plugged by frozen N 2 and an inadequate thermal connection between the cooler 1 st stages and the shield MICE Spectrometer Solenoid Design and Test ResultsPage 7 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 1 Testing Results (cont’d)

8 The blocked helium lines was mainly a procedural and partially a design issue Also, the pressure rise observed within the cold mass during quench was too high It was determined that the venting of the cold mass during quench was not sufficient due to crowding of the single vent line with instrumentation wires Several mechanical issues also arose: magnet alignment in vacuum vessel, support stand height, iron shield support pads, support stand offset MICE Spectrometer Solenoid Design and Test ResultsPage 8 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 1 Testing Results (cont’d)

9 Based on the results of the Magnet 1 testing, several design modifications were proposed Work proceeded to complete the Magnet 2 assembly with design changes while starting Magnet 1 disassembly A new cold mass cooling scheme was devised as well as an improved cooldown procedure The 1 st stage radiation shield connection was modified an an attempt to increase the thermal conduction An additional vent line was added to the cold mass An LN reservoir was added for direct cooldown of shield MICE Spectrometer Solenoid Design and Test ResultsPage 9 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet Design Modifications

10 Magnet Cooling Configurations Original Design Design Option A Cold head Condenser Cold mass shell Coils LHe line Trap Larger diameter No trap (Magnet 1) Design Option B Direct connection LHe (not adopted) (Magnet 2) MICE Spectrometer Solenoid Design and Test ResultsPage 10 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

11 MICE Spectrometer Solenoid Design and Test ResultsPage 11 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Cryostat and Cooling System Mods 1100 Al radiation shield connections Cold head 1 st stage Radiation shield Additional vent line Direct cryostat connection option

12 Liquid/vapor He accumulator and cryocooler sleeves MICE Spectrometer Solenoid Design and Test ResultsPage 12 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Modified Recondensing System

13 MICE Spectrometer Solenoid Design and Test ResultsPage 13 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Liquid Nitrogen Reservoir LN reservoir Radiation shield Thermal plate connection 1 st stage cooler connection Vent/fill lines (3) Reservoir provides direct LN cooldown of shield May improve thermal connection between 1 st stage of cryos and shield Frozen mass of nitrogen protects leads in event of power failure (if LN is left in reservoir and temp. is low enough)

14 After completing the described modifications earlier this year, an attempt was made to cool Magnet 2 with cryogens An ice blockage developed within the cold mass fill line The fill line geometry (90° bends) prevented clearing of the blockage, and the vendor moved the stinger to a vent line Continuing the fill process led to a leak in a Conflat flange in the 2 nd vent line (the one not being used for filling), venting the vacuum space to helium and aborting the cooldown The Magnet 1 fill line routing has been changed to avoid sharp bends and thus improve the ability to clear a blockage MICE Spectrometer Solenoid Design and Test ResultsPage 14 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 2 Testing Results

15 After warming up the magnet, the Conflat flanges were replaced with welded joints Since the fill line blockage was likely a procedural issue, a safer and more robust technique for cooldown was devised (Bross/FNAL) and has worked well The subsequent cooldown was successfully completed in only ~3 days w/o incident However, the shield temperature fell slowly to only about ~115 K at the ends of the cylinder, resulting in added heat flow into the cold mass via the cold mass supports MICE Spectrometer Solenoid Design and Test ResultsPage 15 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 2 Testing Results (cont’d)

16 80K (no current) 90-95K (182 to 238 A) 102K min 65K Not working 74K No other shield sensors here Magnet 2 Measured Temperatures MICE Spectrometer Solenoid Design and Test ResultsPage 16 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

17 The improved(?) shield thermal connections and the LN reservoir did not solve the previous shield problems The coolers are expected to maintain the LHe level after filling; ~1% of the LHe was being lost overnight (unpowered) At this point, training began and appeared to be going well The magnet underwent five training quenches at currents ranging from 182 to 238 A At 238 A (w/all coils in series), one of the HTS leads burned out due to a higher than allowable temp. at the upper end MICE Spectrometer Solenoid Design and Test ResultsPage 17 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 2 Testing Results (cont’d)

18 The upper lead temperature without current was ~80 K, increasing to >90 K with current, eventually resulting in failure of the lead farthest from the coolers The lead problem was a surprise, as it was not noticed in the earlier Magnet 1 tests; the feedthroughs and all the leads are the same ones used before in Magnet 1 We are currently thermally testing the feedthroughs and leads in an off line test to see what can be learned MICE Spectrometer Solenoid Design and Test ResultsPage 18 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Magnet 2 Testing Results (cont’d)

19 Changing flexible connection does not appear to have had a major impact on shield temperatures New Al straps are thicker than the original Cu, but the Cu conductivity was better and the original straps were shorter Our vendor, Bert Wang, has stated that he believes the connection to the shield is inadequate There have been no indications of vacuum problems other than the seal failure that occurred in the vent line No local icing has been observed on the vacuum vessel Temperature measurements using a thermal laser probe have not revealed any irregularities MICE Spectrometer Solenoid Design and Test ResultsPage 19 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Testing Results Discussion

20 MICE Spectrometer Solenoid Design and Test ResultsPage 20 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Photos for Discussion

21 Upper Leads and HTS Leads MICE Spectrometer Solenoid Design and Test ResultsPage 21 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

22 Upper Leads and Thermal Intercepts MICE Spectrometer Solenoid Design and Test ResultsPage 22 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

23 Upper Leads and 300K Feedthrough MICE Spectrometer Solenoid Design and Test ResultsPage 23 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

24 Upper HTS Leads Thermal Intercept MICE Spectrometer Solenoid Design and Test ResultsPage 24 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

25 SC leads at cold mass feedthrus MICE Spectrometer Solenoid Design and Test ResultsPage 25 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

26 Coil Taps & Intercepts for Lower HTS Leads MICE Spectrometer Solenoid Design and Test ResultsPage 26 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

27 Coil Taps & Intercepts for Lower HTS Leads MICE Spectrometer Solenoid Design and Test ResultsPage 27 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

28 Magnet 2 HTS Leads (right lead burned out) MICE Spectrometer Solenoid Design and Test ResultsPage 28 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

29 Radiation Shield Thermal Connection MICE Spectrometer Solenoid Design and Test ResultsPage 29 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 6061 Al cylinder ~6 mm thick

30 Upper Thermal Shield Connection MICE Spectrometer Solenoid Design and Test ResultsPage 30 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 Cu/Al transitions (10 each) 1st stage Cu plate 6061 Al cylinder ~6 mm thick

31 Magnet 1 Shield Flexible Connection MICE Spectrometer Solenoid Design and Test ResultsPage 31 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009 OFHC copper straps

32 Magnet 2 Shield Thermal Connection 1100 series aluminum connection to thermal shield (previously thin copper) MICE Spectrometer Solenoid Design and Test ResultsPage 32 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

33 Magnet 2 Shield with Flexible Connections MICE Spectrometer Solenoid Design and Test ResultsPage 33 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

34 Plates Welded to Shield for LN Reservoir MICE Spectrometer Solenoid Design and Test ResultsPage 34 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

35 MLI Wrapped Cold Mass and Shield MICE Spectrometer Solenoid Design and Test ResultsPage 35 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

36 Partially Assembled Magnet MICE Spectrometer Solenoid Design and Test ResultsPage 36 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

37 Close Up of Cold Mass End MICE Spectrometer Solenoid Design and Test ResultsPage 37 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

38 MLI on Shield & Vacuum Vessel Inner Bores MICE Spectrometer Solenoid Design and Test ResultsPage 38 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

39 MLI Wrapped Cooler Sleeves and Leads MICE Spectrometer Solenoid Design and Test ResultsPage 39 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

40 Cold Mass Connections (Magnet 1) MICE Spectrometer Solenoid Design and Test ResultsPage 40 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

41 Cold Mass Support during Fit Up MICE Spectrometer Solenoid Design and Test ResultsPage 41 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

42 Cold Mass Support Connection to Shield MICE Spectrometer Solenoid Design and Test ResultsPage 42 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

43 Thermal Shield Support MICE Spectrometer Solenoid Design and Test ResultsPage 43 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

44 Temperature Sensor on Cold Mass Bore MICE Spectrometer Solenoid Design and Test ResultsPage 44 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

45 LHe Cooldown of Magnet MICE Spectrometer Solenoid Design and Test ResultsPage 45 Steve Virostek -- Lawrence Berkeley National Laboratory -- November 18, 2009

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