2012 May 17 1

JWST FGS & NIRISS CVAC TestsNovember 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 FergusonComdev Canada, CSA, UdeM, HIA

FGS: Fine Guidance SensorNIRISS: Near-InfraRed Imager & Slitless Spectrograph

2012 May 17 2

Fine Guidance Sensor (FGS) Optical Layout

2 m

100 mm

Pick-Off Mirror

TMA Mirrors

Focus Mirror

Detectors

Role of FGS: Provides centroids to the Attitude Control System.

2012 May 17 3

FGS Optical Assembly

2012 May 17 4

FGS at the David Florida Laboratory

2012 May 17 5

FGS entering chamber

2012 May 17 6

FGS Optical Assembly

2012 May 17 7

FGS in chamber

2012 May 17 8

Optical Ground System Equipment (OGSE)

2012 May 17 9

Optical Ground System Assembly (OGSE)

NIRISS

NIRISS

2012 May 17 10

Floor plan for CVAC test

2012 May 17 11

Temperature Profile

2012 May 17 12

Chamber background

2012 May 17 13

Location of OGSE Spots in G1

2012 May 17 14

Images of OGSE Sources

2012 May 17 15

Bad Pixel Maps

2012 May 17 16

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 CDS1 and

CDS2.• 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.