Plans for Cooldowns

Cooldown 1

(week of 8/24/98)

Task	Need	Cold Tests
new suspension		hold time mechanical inspection during assembly, disassembly
indium seals		leak? do jackscrews mar surface?
microphonics	copper plates	microphonics tests, spectrum analyzer and Macintosh
cold electronics	preamp 1 noise on Mac	load curves noise on Mac noise on spectrum analyser bad pixels assessment JFET noise on spec. and on Mac
He-3	test Erik's program and TMB	cycle hold time
Labview	put stuff in rack	test Erik's program and TMB

Before Cooldown 2:

remove Cu wires from JFET box
Install new optics: Tom (Giles)

array lenses?
a/r coated lenses
450 micron filter
450 micron hwp
blocker if necessary

Fix as many bad pixels as possible:

Tom: preamp
Dave, Giles, Jesse, Bob: cold electronics

Ring stand: Jim
Warms checks on all 'cold electronics' :Dave, Jill, Jesse, Bob H.

JFET boxes included
also check it after installation of tens. wires.

Optics setup aligned: Tom, Jim
Improve T-channel wing support

Cooldown 2

(week of 9/21/98
Begin Assembly 9/22/98)

*note: By this time we should have blocking filters from England.

Task	Need	Cold Tests
jackscrew holes (2 seals)	more jackscrews (JJ)
ring stand (DC, JJ, GN)
DC trains TR, JH, GN in dewar assy (Kevlar, indium, etc.):	Web instructions are complete? (DC, GN)
holes for pumping line support	design (GN)
feedthru	location (GN)
grounding wire holes
He-3 line protection	design coverlets (leftover JJ)
microphonics
bad pixels	-	measure resistance of T-D9 and 0.3 K
system tests. Does hwp introduce noise?
cold electronics tests	-	see list in 'cooldown 1'

Before Cooldown 3:

Install new snout:

Dave (snout glued & leak checked
Jim (modify endplate

cold test optics snout (PM, DC)
develop temp. control for JFETs (GN, RH)
rewire preamps and short cold cable (GN, JJ, RH)
add He-3 to inner stage if desired (to 25 lbs) (DC, GN)

Cooldown 3

(week of 10/19/98)

Task	Need
new snout	new groove (JJ, JS) glue pressure window (DC)
optics tests	new array lens holders (JJ, GN)
adjustable grid installed	dewar stand (must be built)
half-wave plate monitor (RH, TR, JJ)	RH, TR wire this. JJ build pickups
new electrical feedthrus (RH wiring)	delivered 9/25 from J. Sundwall
vacuum sensor
new port for pumped pot	delivered 10/1 from J. Sundwall
test gain control
train John Davis (?)

Before Cooldown 4

paint insides of dewar (if necessary?)

Cooldown 4

(week of 11/2/98)

test new indexer

Can preamps be heated without noise?

test electronic level sensor