Coupling Coil Test Facility Update

Ruben CarcagnoFermilab

September 20, 2012

Ruben Carcagno | MICE Collaboration VC 2

Introduction• About a year ago, the MICE Collaboration asked Fermilab for

urgent help to provide a cold test facility for the Coupling Coils.• A plan was developed and approved by Fermilab’s directorate

on January 17, 2012. Main elements of the plan:– Use a SMES cryostat from the National High Magnetic Field Lab

found by LBNL– Fabricate and Install a new “Solenoid Test Facility” at Fermilab’s

Central Helium Liquefier (CHL), with first use for MICE coupling coil solenoid testing

• Examples of future possible use of this facility include mu2e Transport Solenoids (with test stand upgrades) and additional test stands for ITER CS modules and mu2e Production Solenoid

• A Fermilab initial review of the test facility preparations took place on February 2012. The review committee agreed with the proposed approach. Work on this new facility quickly ramped up.

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 3

Test Requirements and Scope of Work

• Functional Test Requirements Specified (TID-N-445)– Main objective is to train the coil and verify that it can

hold a minimum test current of 210 A for at least 24 hours, and also include a thermal cycle

• Statement of Work Specified (TID-N-465)– The SOW for the various institutions involved (FNAL

APC/TD/AD and LBNL) has been agreed and documented

• Interface Documents In Progress (TID-N-466, etc.)– Documents specifying the detailed technical

interfaces between major institutional deliverables have been filled in with design information.

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 4

Cold Mass Preparations (LBNL)

• Includes cooling tubes welding, installation of leads stabilization, passive QP (cold diodes), instrumentation, etc.

• Installation nearly complete, leak repair in progress

September 12, 2012

Cooling Tubes

Connections

SC Leads Stabilization

Cold QP Diodes Leads

Stabilization

Ruben Carcagno | MICE Collaboration VC 5

Cold Mass Preparations (LBNL)

• Cooling Tube Vacuum Leak found during checkout– Delivery to Fermilab delayed while leak is being fixed

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 6

Test Cryostat• The Test Cryostat was brought to Fermilab from the NHMFL in Florida and

installed in the CHL building, South Annex• Unnecessary internals were removed, and both the vacuum vessel and the top

plate were leak checked and passed

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 7

Top Plate Insert

• Cryo piping more than 90% complete• Current leads and coil support structure

design completed, fabrication in progress

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 8

Current Leads• Conduction-cooled, optimized

for 220A• Two thermal intercepts: 60K

(thermal strap to 4.5K GHe return pipe) and 4.5K (Wang NMR intercept to 4.5K boiling He reservoir)

• Low Temperature Superconductor (LTS) section between 4.5K intercept and coil leads

• G-10 mechanical support for magnetic forces

• Design and detailed drawings complete, fabrication in progress and nearly complete

September 12, 2012

Room Temperature

60K Intercept

4.5K Intercept

LTS cable to Coil lead

Ruben Carcagno | MICE Collaboration VC 9

Top Plate• All valves and instruments procured, installation in progress• Instrumentation tree fabricated, passed leak check• Dished Head fabrication in progress at Meyer Tool, delivery September 21,

2012

September 12, 2012

New Dished Head

Ruben Carcagno | MICE Collaboration VC 10

Dished Head Fabrication• Ready for delivery from Meyer Tool• Next is Load Test and Vacuum Leak Check at Fermilab

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 11

Cryogenic System• Liquid Helium and Helium gas recovery provided by the

Central Helium Liquefier (unused after the Tevatron shutdown in September 2011)

• Up to 10 g/s of liquid helium at 4.5K will be supplied to the Coupling Coil cooling tube from a nearby CHL 10,000 Gallon liquid helium Dewar

• Helium inlet temperature during cooldown/warmup will be controlled to maintain a maximum cold mass gradient of 50K

• The return helium will be warmed up to room temperature before sending back to the CHL facility for recovery

• No venting to atmosphere expected during a quench (small LHe inventory in the cooling tube)

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 12

CHL Distribution System• Liquid Helium (LHe)Transfer Line from 10,000

Gallon LHe dewar to Bayonet Can

September 12, 2012

Bayonet Can LHe Transfer Line

Connection to LHe Dewar

Ruben Carcagno | MICE Collaboration VC 13

Cryogenic System P&ID

September 12, 2012

U-Tube to Bayonet Can

Return Gas to Warmup

Heater

Ruben Carcagno | MICE Collaboration VC 14

Electrical and Software Systems DAQ, Quench Detection, Controls

• Design complete, more than 25 detailed electrical drawings completed• Racks assembled, networking installed and operating, checkout completed• Software design complete, configuration and checkout in progress• Local control station at CHL and remote station at IB1 Magnet Test Facility control• E-log and measurement data will be available on the web

September 12, 2012

Remote Test Stand control station at IB1 Magnet Test Facility Control Room Electronic racks at CHL near cryostat

Ruben Carcagno | MICE Collaboration VC 15

Local Test Stand Controls

September 12, 2012

CHL Test Stand Control Room (Climate Controlled, Acoustically Insulated)

Test Stand Electronic Racks and Monitors near Test Cryostat

Ruben Carcagno | MICE Collaboration VC 16

Voltage Taps DAQ and Quench Detection System

• Similar Fermilab system being used successfully for the MICE Spectrometer Solenoid Test at Wang NMR

• Example: Quench on 6/26/12, I = 215 A

September 12, 2012

Quench developing at “End Coil 2”

QD tripped power system when the 5.5 V threshold was exceeded after ~140ms from Quench Onset

Voltage tap signals recorded during ~30 sec current decay

Quench Onset

Ruben Carcagno | MICE Collaboration VC 17

Power System• The Test Facility Power System Rack will be delivered by LBNL in September 2012• Power Supply procured by LBNL, arrived from vendor in the UK on 9/17/2012• The power system rack components are shown in the following block diagram

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 18

Safety• A special ES&H safety panel has been appointed by the

AD Head to review the magnetic, electrical, and mechanical safety of the test stand installation in CHL premises

• A permanent CHL cryogenics panel will review the cryogenics integration of the cryostat into the CHL cryogenic system

• A special engineering panel has been appointed by the TD Head to review the safety of the cryostat and its ancillary equipment

• Both AD and TD Heads will sign the Operational Readiness Clearance after all safety panels recommend safe operational readiness

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 19

Schedule

• Test is expected to start in November 2012 and last for approximately two months– May be delayed because of the cold mass vacuum leak repair at LBNL

September 12, 2012

Ruben Carcagno | MICE Collaboration VC 20

Summary• A new Solenoid Test Facility at Fermilab is being

constructed at the repurposed Central Helium Liquefier, with the first test stand intended for MICE Coupling Coil Solenoids testing

• Test Stand design is complete, fabrication and installation is near completion

• Delivery of the first coupling coil cold mass to be tested to Fermilab has been delayed due to a cooling tube vacuum leak repair – delivery is expected in a few weeks

• Testing is expected to start in (late?) November 2012 and last for approximately two months

September 12, 2012