Spectrometer Solenoid Fabrication & Testing Update Steve Virostek Lawrence Berkeley National Lab MICE CM24 at RAL June 1, 2009

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 2 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 MICE Cooling Channel Layout Spectrometer Solenoid #1 (reassembly under way) Spectrometer Solenoid #2 (final assembly complete, testing under way)

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 3 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Magnet cool down Helium system leak Current progress LN cool down system Temperature logging system Electronics racks Tracker go/no go gauge 2 nd magnet progress Upcoming task schedule Topics

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 4 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Helium Cryostat Leak Magnet had been completely assembled and cooled to 5K (cold mass) and transfer of LHe was under way After an LHe dewar change, the system was not flowing Vendor suspected an ice blockage and attempted to thaw out fill line with heated helium gas Blockage remained, so vendor attempted to transfer LHe through a vent line An internal leak between the cryostat and the insulating vacuum caused the insulating vacuum to fill with helium After some disassembly, a leak was found in one of the vent lines (likely at a Conflat seal) and has been repaired

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 5 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 LN Cooldown of Magnet Cooler He lines Transfer line

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 6 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 LHe Transfer into Cold Mass Fill line turret Transfer line Vent line turret

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 7 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 LN & LHe Dewars for Cooldown

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 8 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Fill and Vent Line Configurations

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 9 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Magnet Cross Section View Fill Vents

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 10 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Fill and Vent Turrets Normal stinger location Leak area 2nd stinger location Vacuum Helium

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 11 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Possible Leak Locations Conflat seal Weld

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 12 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Turret Removal to Access Vent Lines Upper turret weld Vent lines Lower turret weld

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 13 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Exposed Vent Lines after Turret Removal Fill/precool port Vent line with instrumentation (leak location) Added vent line

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 14 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 FNAL LN Cooldown Control System Heaters Thermocouple Control system chassis Flow control valve LN System was successfully operated during cooldown Modifications to control circuitry needed to optimize performance

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 15 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 LN Cooldown Chassis and Heaters

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 16 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Temperature Logging System in Use System now operating 16 channels being logged User can specify logging time increment

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 17 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Temperature Logging System Screen Shot

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 18 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Power Supply Racks Two power supply racks have arrived at Wang NMR from RAL Installation of power supplies and discharge circuits are under way (one rack per magnet) Spec supplied by RAL dictates locations of components First rack expected to be ready for training of first completed magnet

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 19 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Tracker Go/No Go Gauge in Place Gauge

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 20 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Original First Magnet Cold Mass Assembly

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 21 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, K Shield Connections (1 st magnet)

MICE Spectrometer Solenoid Fabrication and Testing UpdatePage 22 Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009 Magnet leak check and re-welding of the vent line turret are to be completed this week Cooldown of the magnet could start next week FNAL and LBNL are working on a procedure to prevent ice blockages from forming during cooldown Magnet cooldown is ~1.5 week process System to be run at operating temperature for ~24 hours to ensure recondensing system is functional Magnet coils are to be trained prior to warming up for shipping to FNAL (likely mid-July if no other problems) Upcoming Tasks