Report%20to%20the%20SSC

1
DEIMOS

• Report to the SSC
• March 14, 2000

2
Outline

• Thumbnail sketch of status
• Schedule
• Budget (not on web version)
• Detailed status and progress
• Concerns
• Other Issues

3
Thumbnail sketch of status

• Optical Assembly complete optical testing of the
  camera planned to start this week
• Cold testing with an engineering mosaic of MIT/LL
  chips in the dewar has started.
• Science Array with 8 epi CCDs starts assembly
  this week
• We have fabricated all major parts of the optical
  train with the exception of grating sliders 34
  sliders 34 will complete in April
• Major systems are being integrated onto
  structure starting testing (slitmask system,
  grating system, filter wheel.)
• Calibration and FC light sources are last systems
  needing design

4
Scheduled Milestones
5
Critical Path
6
Camera
7
Dewar System
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Schedule Analysis By Critical Path

• Dewar Slip 7 weeks
• Contingency makeup (prorated) -2 weeks
• SPIE makeup -1 week
• Net slip 4 weeks
• Critical Path inefficiency (raw) 20.5w/13.5w
  1.51
• Corrected for contingency (18.6) 1.27

9
Schedule Analysis by Tasks Completed

• Number of task-days scheduled, 10/11/99 to
  3/14/99 (A) 1383 days
• Number of task-days actually completed (B)
  828 days
• Inefficiency factor (A/B) 1.67
• Corrected for contingency (divide by 1.186)
  1.41

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Predicted Pre-Ship Review Date

• Optimistic current slip does not increase- 4
  weeks 12/4/00
• Conservative critical path inefficiency factor
• remains constant (1.51)
  15 weeks 4/4/01

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Status and Progress

• Camera
• Dewar/Detectors
• Grating System
• Filter Wheel
• Structure
• Slit Mask
• Collimator
• Tent mirror
• Shutter
• Calibration System

• FC System
• TV System
• Software
• Site
• Web site
• Shipping

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Camera

• Camera is assembled
• Optical testing is about to start

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Camera
14
Camera Cell 1
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Camera, cells 12
16
Camera, cells 1,2,3
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Camera Body 3
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Element 5 Fracture
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Camera, cell 4
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Camera
Spacers, filter wheel, and shutter
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Camera
Element 9 and dewar window
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Camera Test Stand
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ORA Respace

• Adjustments to multiplet spacings were less than
  0.012 in
• Respace design has rms image diameters 0.18 -0.20
  arcsec. This is 20 better than error budget to
  this point (not all errors yet included)

24
Camera

• Testing plan starts next week
• Image size and aberrations
• Interferometric tests

25
Detectors

• Eight science-grade epi CCDs are in hand for
  first science mosaic.
• Recent setbacks on Lot 14 high-rho CCDs have
  occurred supply is unclear

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Dewar

• Cooling test with dead mosaic completed
  successfully
• Warm test with engineering mosaic completed
  successfully
• Science mosaic with 8 epi CCDs is under
  construction
• Cold test with engineering mosaic is starting
• Read out noise is low
• Electrical crosstalk is low
• Recent leak will cause a slip of 1 week
• Two CCDs do not work cause unknown
• RTV window seal outgasses water onto CCDs seal
  will have to be replaced

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Dewar
Dewar on test stand with EE mosaic
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Dewar
CCD controller attached to dewar
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Grating System

• Two of 4 sliders complete and installed
• Testing of grating slide drive in progress
• Sliders 34 complete by end of March
• Grating installation fixture nearly complete

30
Grating System
Sliders 12
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Grating system
Drive System
32
Filter Wheel

• Fabricated
• Assembly is in progress

33
Structure

• Rotation tests indicate that drive hardware is
  extremely good
• Drive servo system and software are planned to
  begin in May

34
Collimator

• Cell complete and fitted into DEIMOS structure
• Collimator is aluminized

35
Tent Mirror

• Attachment points have been installed on mirror
• Piezo hardware exists
• Mirror to be aluminized in April
• Dummy mirror to be installed in DEIMOS for
  testing in May

36
Tent Mirror
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Shutter

• Assembled and tested
• Plan to change out air cylinders to ones similar
  to ESI

38
Calibration System

• Currently in design phase
• System will be very simple with bulbs and
  reflectors in the forward part of instrument and
  power supplies in electronics lockers
• Ne, Ar, He, HgCd, possibly Kr and Xe, plus quartz
  continuum lamp

39
FC Light System

• Have fibers and plan to start testing in April
• Requires integration with the slit mask holder
  design (April)
• Light source is two Cu-Ar lamps (one for backup)

40
TV System

• Design complete
• Very similar to system used in ESI
• Fabrication scheduled to begin in April, complete
  in May

41
Software

• Continuing delays due to ESI and HIRES exposure
  meter
• Kibrick working on signal chain, not software
• Mosaic descrambing software is written
• RTD image display tool will probably be DS9 NOAO
  RTD not needed

42
Site

• Bi-weekly participation in team meetings
• Channels for rails in right Naysmith platform are
  complete
• Modifications have not yet been made to cable
  wrap on telescope (Kyle and Mark have drawings)
• Table of contents for a Lick/CARA interface
  document have been developed

43
Web Site

• Comprehensive design is in progress inspired by
  ESI
• Test Data section is now archiving all test
  results in standard format

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Shipping

• Main structure can be shipped by Matson will
  require custom crate.
• Will likely need separate marine container for
  fixtures and other large heavy parts not attached
  to main structure for shipping
• We will air-freight optics and most electronics,
  as did ESI

46
Concerns

• Ice condensation in dewar new mount for dewar
  window
• Acquisition of hi-rho devices number and
  schedule
• Stages and mechanisms needing extensive rework
• Flexure
• Software scheduling
• Testing personnel
• Ghost reflections
• purchase of new blank for element 5