The ACIS Instrument

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The ACIS Instrument

• Gordon P. Garmire
• Evan Pugh Professor
• ACIS IPI
• The Pennsylvania State University

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Original Co-Investigators

• John Nousek
• Saul Rappaport
• -- George Ricker
• Guenter Reigler
• Richard Sherman
• Wallace Sargent
• Daniel Weedman

• Hale Bradt
• David Burrows
• Claude Canizares
• George Clark
• Stewart Collins
• Eric Feigelson
• Jeffery McClintock
• James Morrison

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The ACIS Team during the construction phase
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Timeline of ACIS

• 1978 first X-rays on a WFPC Chip
• 1984 Proposal for ACIS submitted
• 1985 NASA Selects ACIS
• 1985 Select MIT over JPL for management
• 1988 Drop TI as CCD source, go to LL
• 1988 ASTRO-D (ASCA) test bed for LL CCDs
• 1988 Review before Phase C/D contract
• 1989 Slow start,
• 1990 Settled on LL CCD design
• 1992 Descope to high orbit and 4 mirrors, 2 FP
  instruments.
• 1994 Final CCD design and flight unit production
  starts
• 1995 Crisis on schedule, William Mayer takes over
  as Project Manager, MIT goes into crisis mode.

• 1995 Decide to use 2 chip for initial calibration
• 1996 Only two BI chips good, use on S3, S1
• 1996 Cracks in filters, change to polyimide and
  recalibrate
• 1996 Flexprint failures, need to fix CCDs on
  flight paddles
• 1997 Contamination on CCDs in cal at MIT
• PSU microprobe shows low Na and K
• 1997 Calibration of 2C and flight unit
• 1997 Vac test of full instrument on SIM
• 1998 Full test of S/C TV at TRW, ACIS door fails
  to open
• 1998 Design safety for door opening
• 1999 All door tests look good, no test in STS
  before deploy
• 1999 Launched

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AXAF Launch sequence
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The original ACIS instrument
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The final configuration
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The Full ACIS Instrumennt
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The ACIS Vacuum Door
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ACIS Venting Assembly
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The oxygen-rich SNR G292.01.8Peter Romig, David
Burrows, Sangwook Park, Jack Hughes and Pat Slane
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The mysterious central object in RCW103
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The Crab nebula and PulsarKoji Mori and David
Burrows
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The 1 Ms Orion Region
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The 2 Ms CDF-N