R. Rucinski, Fermilab Feb. 9, 2005 Project Status 2 cassette VLPC Cryostat Russ Rucinski - Fermilab This presentation will probably involve audience discussion,

R. Rucinski, Fermilab Feb. 9, 2005

Project Status

2 cassette VLPC Cryostat

Russ Rucinski - Fermilab

R. Rucinski, Fermilab Feb. 9, 2005

Preliminary fit up - good

R. Rucinski, Fermilab Feb. 9, 2005

Preliminary fit up - good

R. Rucinski, Fermilab Feb. 9, 2005

Status SummaryReal assembly should start this week.Many miscellaneous parts ordered and

most here. (o-rings, bolts, cryo grease, fittings, copper strips)

Compressor for Cryo cooler wired up. Extending control cables.

Run Cryo cooler only – week of 2/21?Cool cassettes – week of 2/28 or later?Ship in March

R. Rucinski, Fermilab Feb. 9, 2005

Pictures – Thermal links Thermal link fabrication problems have a solution –

Copper here. Solder on order. Delivered parts cleaned up for re-use.– Using 30 sheets of 0.005” thick copper at each link.– Polyimide (Kapton) 0.003” as solder mask– Calculate Temp drop 1.0 K at 65 K, & 0.1 K at 8 K station– Calculate 20 lbf, 90 Newtons force to flex

R. Rucinski, Fermilab Feb. 9, 2005

Pictures – Assembly stand

R. Rucinski, Fermilab Feb. 9, 2005

PicturesInvar Envelopes:Dimensional dummy Inserted in RHS Stiffener parts

CompressorWired up

R. Rucinski, Fermilab Feb. 9, 2005

Areas of possible concernControl system details

– Sensors, controllers, heater, feed thru’sSafety Documents & approval

– “Pressure vessel” is special– Need to size & obtain relief valves

Thermal link fabrication unknownsTemperature & pressure stability

– small gas volume– part of commissioning/test

R. Rucinski, Fermilab Feb. 9, 2005

Schedule detailsStep Status Date

Shipment of parts arrive from Japan Done - Arrived at FNAL Jan. 3

Uncrate, inspect, and inventory parts Done Week of 1/17

Make parts, o-rings, modifications to parts as necessary Making 4 needed parts now Week of 1/17Still need to unsolder copper parts

Fabrication of invar envelopes at FNAL Done Week of 1/17

Write req, send out drgs, fabricate backplane structure Need to do Week of 1/17

Smooth o-ring surfaces on underside of top lid Done Week of 1/17

Order missing/auxilliary items (heaters?,sensors?,o-rings?, reliefs?) Most parts here or on order Week of 1/24thin 0.005" OFHC Copper rolls & solder on order for thermal clamps Need to buy lid heater & temp sensorsSilicon O-rings for envelope due week of 2/7.

Assemble invar envelope and structure to lid Waiting for silicon o-rings: due this week Week of 2/7

Make safety document & request approval to operate Week of 2/7

Pull vacuum on cryostat vacuum jacket - Leak check envelopes 2 weeks behind initial shedule Week of 2/14

Assemble cryocooler into lid, instrument cold end, re-close Week of 2/14

Assemble controllers, and operating control system(s) Week of 2/14

Run cryo cooler, input heat at stages, measure temps Week of 2/21

Open up, load cassettes into envelopes, make thermal links, re-close Week of 2/21

Receive approval to operate cryostat with cassette space > atm

Run cryo cooler cryostat with cassettes, operate cassettes. Week of 2/28

Crate up and ship Mid March