Spectrometer Solenoid Fabrication & Testing

Update

Steve VirostekLawrence Berkeley National Lab

MICE CM24 at RAL June 1, 2009

MICE Spectrometer Solenoid Fabrication and Testing Update Page 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 Update Page 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•2nd magnet progress•Upcoming task schedule

Topics

MICE Spectrometer Solenoid Fabrication and Testing Update Page 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 Update Page 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 Update Page 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 Update Page 7

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

LN & LHe Dewars for Cooldown

MICE Spectrometer Solenoid Fabrication and Testing Update Page 8

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

Fill and Vent Line Configurations

MICE Spectrometer Solenoid Fabrication and Testing Update Page 9

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

Magnet Cross Section View

Fill

Vents

MICE Spectrometer Solenoid Fabrication and Testing Update Page 10

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

Fill and Vent Turrets

Normal stinger location

Leak area2nd stinger location

Vacuum

Helium

MICE Spectrometer Solenoid Fabrication and Testing Update Page 11

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

Possible Leak Locations

Conflat sealWeld

Weld

MICE Spectrometer Solenoid Fabrication and Testing Update Page 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 Update Page 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 Update Page 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 Update Page 15

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

LN Cooldown Chassis and Heaters

MICE Spectrometer Solenoid Fabrication and Testing Update Page 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 Update Page 17

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

Temperature Logging System Screen Shot

MICE Spectrometer Solenoid Fabrication and Testing Update Page 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 Update Page 19

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

Tracker Go/No Go Gauge in Place

Gauge

MICE Spectrometer Solenoid Fabrication and Testing Update Page 20

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

Original First Magnet Cold Mass Assembly

MICE Spectrometer Solenoid Fabrication and Testing Update Page 21

Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009

70K Shield Connections (1st magnet)

MICE Spectrometer Solenoid Fabrication and Testing Update Page 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