JWST FGS & NIRISS CVAC Tests November 1, 2011 − January 25, 2012 Pierre Chayer, André Martel, Alex Fullerton, Ed Nelan, Kevin Volk, Anand Sivaramakrishnan, Sherie Holfeltz, Van Dixon, Paul Goudfrooij, Deepashri Thatte, Harry Ferguson Comdev Canada, CSA, UdeM, HIA FGS:

F

ine

G

uidance

S

ensor NIRISS:

N

ear-

I

nfra

R

ed

I

mager &

S

litless

S

pectrograph 2012 May 17 1

Fine Guidance Sensor (FGS) Optical Layout Role of FGS: Provides centroids to the Attitude Control System.

Pick-Off Mirror Focus Mirror Detectors 2012 May 17 2 m 100 mm TMA Mirrors 2

2012 May 17 FGS Optical Assembly 3

FGS at the David Florida Laboratory 2012 May 17 4

2012 May 17 FGS entering chamber 5

2012 May 17 FGS Optical Assembly 6

FGS in chamber 2012 May 17 7

Optical Ground System Equipment (OGSE) 2012 May 17 8

Optical Ground System Assembly (OGSE) NIRISS NIRISS 2012 May 17 9

2012 May 17 Floor plan for CVAC test 10

Temperature Profile • Slower Cool-down • ~80K Plateau moved up • 3x 37 K Plateaus • Extended 40.5 K Plateau • Normal warm-up 100 10

37 K #1 CVAC Temperature Summary ~80 K 37 K #2 22 K Survival 40.5 K Plateau 37 K #3

FGS Average Thermal Strap KM Average

Test Day

IP Average TV3 Chamber Average (K) GHe Average 2012 May 17 11

2012 May 17 Chamber background 12

2012 May 17 Location of OGSE Spots in G1 13

2012 May 17 Images of OGSE Sources 14

Bad Pixel Maps 2012 May 17 15

IDENTIFICATION • Identification of the Guide Star.

• Full-frame: strip readout: 36 (64x2048) strips, 8 overlaps.

• ID strip integration time: 0.32 sec.

• Strip readout: read-read-reset-read-read  CDS2.

CDS1 and • Create two lists of bright objects.

• Merge the two lists  one list.

• Identify guide star and ref. stars  Triad algorithm.

• Success  Guide star is identified.

• ID timing: 82.12 sec, G1, 5 stars, 8 candidates.

2012 May 17 16