Russ Rucinski, FNAL, Oct. 8, 2006 1

MICE Cryostat Status

1. Prototype cryostatA. Status & Plans

B. Parts

C. Operating data (supplemental)

2. Four final cryostatsA. Status & Parts left to acquire

B. Assembly area & pictures

C. Schedule

Russ Rucinski, FNAL, Oct. 8, 2006 2

Prototype Cryostat Status

Status: Cold, loaded with new cassette #112 in slot 2.

Temperatures and heat loads up slightly from previous operation, but within operating margin (at 60 Hz) cryocooler power.

The trouble may be with cassette #112 construction, but won’t be able to confirm until we warm up and can look at it.

Plans: Staying cold until characterization of #112 is completed.

Russ Rucinski, FNAL, Oct. 8, 2006 3

Nomenclature/Parts – stripped down

Invar Envelopes

Clamping bars

Cryocooler with upper and lower cooling stages

Lower Thermal Links

Upper Thermal Links

Russ Rucinski, FNAL, Oct. 8, 2006 4

Nomenclature/Parts

Lid

Upper intercept

Lower intercept

Cryocooler

Lower Thermal Links

Upper Thermal Link

G10 stiffener panels

(Copper radiation shield & MLI not installed)

Russ Rucinski, FNAL, Oct. 8, 2006 5

Prototype – Recent operating info.

*Heat loads up a bit.Upper CryoCooler temperature 49 K versus 47 KLower CryoCooler temperature 5.9 K versus 5.3 KFrom load map; 58 W & 4.5 W versus 55 W & 4.0 W

*Heat flow across the links up. Q= (K*A/L) ΔTUpper link ΔT = 8.5 K versus 7 KLower link ΔT = 0.21 K versus 0.13 K

*Cassette Temperatures up. (9.0 K req) 105: 7.8 K versus 7.5 K#112: 8.2 K versus #111: 7.1 K

ΔT

Russ Rucinski, FNAL, Oct. 8, 2006 6

Prototype – Recent operating info.

*Cassette 112 upper bulkhead 3 F colder – implies higher heat load down the upper part of cassette.

#112: 69 F#105: 72 FLid temp = 70 F

I suspect foam is missing from upper. I think foam in lower is there.

Russ Rucinski, FNAL, Oct. 8, 2006 7

Four final Cryostats: Status

All parts here except:Invar envelopes: Promised by Oct. 20th

Cryo-Coolers: Have 2. Other 2 still at RAL, H2 R&D

Cassettes: Have four. #105, #111, #112 & #107 (just negotiated).

Eventually need eight.

BackPlane structure: Need to re-order base plate, misc. parts

Russ Rucinski, FNAL, Oct. 8, 2006 8

Four final Cryostats: Assembly Area

“Area 51”:

D-Zero ExperimentHighbay

Fermilab

Russ Rucinski, FNAL, Oct. 8, 2006 9

Four final Cryostats: Assembly Areas

“Solder station”:

Thermal link work

Russ Rucinski, FNAL, Oct. 8, 2006 10

Four final Cryostats: Assembly Area

Work done/being done:G-10 stiffener panels MLI taped.Working on lid plumbingTinning OFHC flexible strips for thermal links

Next: lid heaters, cryocooler mounting, instrumentation feed thru’s, Thermal link assembly

Russ Rucinski, FNAL, Oct. 8, 2006 11

Four final Cryostats: Draft Schedule?

October 2006– Thermal link assembly, lid work, delivery of invar envelopes.

November/December 2006 - First production cryostat completed, use Cassette 111 & 107. Cool down, evaluate. Warm up.

January 2007 – Second production cryostat done. Load with 105 & 112? Cool down, evaluate.

February - April 2007 – Third and Fourth cryostats done, tested.

Note: Cassettes cannot be pulled/changed without unbolting lid, undoing MLI and loosening the clamping bars at the intercepts. So cryostats really aren’t final until loaded with final cassettes and tested.

Russ Rucinski, FNAL, Oct. 8, 2006 12

Closing Remarks

Prototype: Successfully commissioned. Minimal risk of not being able to obtain operating temperature control. Use for station 5, UK or KEK – Nov/Dec.06*

Four Final Cryostats: Will be ready ahead of schedule.

November, 2007 – 4 cryostats, 8 cassettes (4 more need to be liberated from D-Zero with negotiation).*

*revision based on input at CM16