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NICMOS Status Update: Circulator and TurboAlternator Restart Plans

This update outlines the current status and goals for the NICMOS instrument following recent NCS/NCC restart attempts, which have faced circulator issues. Key objectives include preventing moisture migration into the Circulator Pump and avoiding prolonged operation of the TurboAlternator near its low thrust bearing speed limit. The aim is to replicate the successful cooldown conditions from March 2002. Restart criteria have been set, with temperature monitoring essential for pipeline operations. Additionally, recent NICMOS data and instrument handbooks have been released, enhancing post-NCS reprocessing efforts.

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NICMOS Status Update: Circulator and TurboAlternator Restart Plans

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  1. NICMOS Status Update Anton Koekemoer NICMOS Status Update • NCS/NCC restart: • Goals: • Avoid a condition where mostiure can migrate into the Circulator Pump and freeze out (causing current limit violations) • Avoid a condition where the TurboAlternator operates near its lowrr thrust bearing speed limit for an extended period of time • Reproduce as closely as possible the conditions of the successful March 2002 cooldown • Restart criteria: Temperatures within 275 - 278 K for > 12 hours for: • TurboAlternator inlet • Circulator housing • heat rejection interface274 • Temperatures of TA inlet were 274.6 K as of this morning • Aiming for a restart sometime early Friday morning • NICMOS SMOV plan remains ready to execute • NICMOS reprocessing: • All pre-NCS data reprocessed, in HLA • Next step is to continue post-NCS reprocessing

  2. NICMOS Status Update Anton Koekemoer Recent NCS restart attempts • With circulator problems: • 2008 Sep 11: Safed on Circulator speed limit 1396 rps after approximately 6 hours of operation. Circulator Housing Temp ~ 94 K. (NCC Only) • 2008 Sep 15: Circulator Housing Temp ~ 169 K. Safed at start-up on Circulator current limit of 130 mA. (NCC only) • 2008 Sep 16 (1): Circulator Current Limit raised to 150 mA. Safed at start-up on Circulator speed limit of 1396 rps. (NCC only) • 2008 Sep 16 (2): Circulator Upper Speed Limit was disabled. Circulator Housing Temp ~ 187.5 K. Safed shortly after start-up (~25 minutes) on Circulator current limit of 150 mA. (NCC only) • 2008 Nov 19: Circulator Housing temp ~ 274 K. Safed at start-up on Circulator current limit of 150 mA. (NCC Only): • Successful circulator restart, but TA low speed problems: • 2008 Dec 20: Circulator Housing temp ~280 K. TA Inlet temp ~ 209K. Safed on TA Speed low limit of 1650 rps after 65 hours of compressor operations. (NCC Only) • 2009 Jan 15: Circulator Current Limit raised to 200mA. Circulator Housing Temp ~280K. Safed on TA speed low limit of 1650 rps

  3. NICMOS Status Update Anton Koekemoer Other NICMOS News • NICMOS Data Handbook V8.0 released (Thatte, Dahlen et al.) • NICMOS Instrument Handvook v11.0 released (Viana, Wiklind et al.) • Instrument Science Reports: • NICMOS ISR 2009-001 (E. A. Barker & T. Dahlen): "New Bad Pixel Mask Reference Files for the Post-NCS Era" • NICMOS ISR 2009-002 (T. Dahlen et al.): "Temperature Dependent Dark Reference Files: Linear Dark and Amplifier Glow Components" • NICMOS ISR 2009-003 (T. Dahlen, M. Sosey & E. Bergeron): "Updates to Calnica: Using Temperature Dependent Reference Files" • NICMOS ISR 2009-004 (A. C. Viana, R. S. de Jong & A. M. Koekemoer): "NICMOS Photometric Calibration Pipeline" • NICMOS ISR 2009-005 (D. Thatte & T. Dahlen): "NICMOS Temperature Dependent Flat-fields" • NICMOS ISR 2009-006 (N. Pirzkal, R. Bohlin & D. Thatte): "NICMOS Grism Wavelength Calibration" • NICMOS ISR 2009-007 (N. Pirzkal, D. Grumm & E. Bergeron): "CalTempFromBias:Implementation and Testing: • NICMOS ISR 2009-008 (T. Wiklind & D. Thatte): "NICMOS Breathing and Focus Field Variations"

  4. NICMOS Status Update Anton Koekemoer Some NICMOS Reprocessed / HLA images

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