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Spectrometer Solenoid Fabrication Update Steve Virostek Lawrence Berkeley National Lab NFMCC at LBNL January 25, 2009.

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Presentation on theme: "Spectrometer Solenoid Fabrication Update Steve Virostek Lawrence Berkeley National Lab NFMCC at LBNL January 25, 2009."— Presentation transcript:

1 Spectrometer Solenoid Fabrication Update Steve Virostek Lawrence Berkeley National Lab NFMCC at LBNL January 25, 2009

2 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 2 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 MICE Cooling Channel Layout Spectrometer Solenoid #1 (partially disassembled) Spectrometer Solenoid #2 (final assembly under way)

3 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 3 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 First magnet completed after several delays caused by both design and assembly errors; testing revealed several issues Operational issues: helium lines blocked by N 2, poor thermal connection to radiation shield, insufficient cold mass venting Mechanical issues: cold mass alignment, support stand height, iron shield support pads, support stand offset Issues resolved on 2 nd magnet: new cooling circuit, added relief vent line, LN reservoir added, thermal shield connection improved, support stand modified, portable CMM measurements during assembly will ensure proper alignment Second magnet in process of final assembly (w/modifications) First magnet has been partially disassembled to add fixes Summary

4 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 4 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Vacuum Vessel and Thermal Shield Shield assembled w/5 mm Al sheet Vacuum vessel ready for cold mass installation

5 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 5 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Completion of Cold Mass Installation

6 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 6 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 HTS Leads and Cryocooler Sleeves

7 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 7 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Service Tower Components Wrapped in MLI Prior to final welding of tower covers

8 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 8 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Completed Service Tower

9 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 9 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Installed Cryocoolers Removable panel allows access to leads

10 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 10 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Instrumentation Feedthroughs All instrumentation wired and ready for testing

11 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 11 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Completed First Magnet

12 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 12 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Vacuum Leak Check No leaks found in cold mass or vacuum vessel

13 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 13 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Ice on magnet leads during cool down Magnet Cool Down Vent line Fill line

14 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 14 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Magnet cool down accomplished using LN 2 & LHe Cool down is done slowly to control cold mass thermal stress (i.e. limited  T) Cold mass of first magnet reached LHe temperature with no observed problems Cold mass temperature could not be maintained with the cryocoolers (no re-condensing) Apparent blockage in LHe cooling line occurred due to freezing of LN 2 or air All five coils reached a maximum current of 196 amps during training Magnet Cool Down and Training

15 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 15 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Cryocooler Testing All 4 coolers met the mfg. specifications

16 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 16 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Magnet Discharge Circuit Rapid discharge circuit designed and fabricated by Wang NMR Each magnet will have a dedicated circuit The water cooled, aluminum body assemblies are rack mounted Water cooling is only needed during and after a discharge

17 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 17 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Cryocooler Compressors

18 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 18 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Magnet Power Supply Racks Racks include 300 A power supplies, 60 A power supplies and magnet discharge circuits

19 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 19 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Spectrometer Solenoid Iron Shields Design integrated with TOF shield; force analysis and fab drawings done at Oxford Two sets of shields needed at FNAL and one initial set at RAL Fabrication at JK Mfg near FNAL for two shield sets (420 and 600 mm holes) almost complete One set of shields to be sent to RAL with the first magnet

20 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 20 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Issues with Magnet #1 Frozen N 2 in cold mass helium lines prevented proper operation (mainly procedural, partially design issue) Inadequate thermal connection between 1 st stage of cold heads and cold mass radiation shield Venting of cold mass during quench is not sufficient due to crowding of vent line with instrumentation wires No provision for direct cooldown of cold mass radiation shield (i.e. long cooldown time) Mechanical issues: magnet alignment in vacuum vessel, support stand height, iron shield support pads, support stand offset

21 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 21 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Opening of Magnet #1 will be required to perform fixes Helium line blockage: connect cryocooler condenser directly to cryostat, improve cooldown procedure Radiation shield connection: increase thermal conduction with thick 1100 Al flexible straps (instead of thin Cu) Cold mass vent: add additional vent line to the cold mass Radiation shield cooldown: incorporate LN reservoir to allow direct cooldown of shield Mechanical issues: realign Magnet #1 during reassembly (also corrects support stand height), modify end supports to clear iron shield mount pad (Magnets #1 and #2) Design Solutions

22 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 22 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Cryostat and Cooling System Mods Improved radiation shield connection Cold head 1 st stage Radiation shield Additional vent line Direct cryostat connection option

23 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 23 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Magnet Cooling Modifications Original Design Cold head Condenser Cold mass shell Coils LHe line Trap A written cooldown procedure will be generated to ensure that all N 2 is purged from the system prior to introducing liquid helium Modified Design Direct connection LHe

24 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 24 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 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 Inproves thermal connection between 1 st stage of cryos and shield Frozen mass of nitrogen protects leads in event of power failure Reservoir may be empty during operation due to safety concerns

25 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 25 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Vacuum vessel end flange center is not well aligned to coil centers (up to 10mm offset w/current install procedure) Mechanical Issues Cold mass center is not well aligned with the vacuum vessel shell

26 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 26 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Support stand cross beams interfere with the planned location of the lower iron shield saddle plate Mechanical Issues Area of interference

27 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 27 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Support Stand Modification Vacuum vessel Support braces Iron shield lower mount and pad Original Design Modified Design New braces Vendor will modify both ends of both magnets

28 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 28 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Modified Cooling System Liquid/vapor helium accumulator base and cold mass connections Direct cryocooler sleeve connection with bellows

29 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 29 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Leak Test of Cooling System Liquid/vapor He accumulator and cryocooler sleeves

30 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 30 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Liquid Nitrogen Reservoir LN 2 reservoir to be thermally connected to radiation shield Plates welded to radiation shield for reservoir connection

31 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 31 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Radiation Shield Thermal Connection Thicker 1100 series aluminum connection to thermal shield (previously thin copper)

32 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 32 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Fully Assembled Cold Mass and Shield

33 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 33 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 2 nd Magnet Cold Mass Ready to Install Helium cooling circuit modification is complete Improved thermal shield connection added Second cryostat vent tube added LN reservoir installed on thermal shield

34 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 34 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 2 nd Magnet Components before Assembly Vacuum vessel Radiation shield Cold mass

35 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 35 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Vacuum Vessel and Support Stand End flange Modified support stand legs

36 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 36 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Second Magnet Assembly Second magnet in process of final assembly All system improvements have been incorporated

37 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 37 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Second Magnet Assembly

38 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 38 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 Magnet CMM Measurement Portable CMM will be used to align cold mass to end flange and set height Tooling balls will also be added to vessel and fiducialized to cold mass

39 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 39 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 First Magnet Partially Disassembled

40 MICE Spectrometer Solenoid Fabrication Update and Schedule StatusPage 40 Steve Virostek -- Lawrence Berkeley National Laboratory -- January 25, 2009 The plan to move forward involves completing and testing Magnet #2 first (with all modifications) Several technical issues as well as negotiation with the vendor on change costs has delayed completion Completion of the first unit (Magnet #2) and start of cooldown & testing is expected to occur in late February Upon shipping of Magnet #2 (now first unit), Magnet #1 will be modified (reconfigure cooling, add vent line, LN reservoir, etc.) The reassembly and completion of Magnet #1 should follow by two to three months Schedule

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