DEIMOS

Presentation to the SSC

January 25, 2001

2

Outline

• Quick overview of Budget and Schedule (web version has no Budget figures)

• Progress Since Last Report

• Technical Concerns

• Optical Testing

• Flexure

• Grating System

• Red CCD Status

• Schedule Details

• Budget Details

3

Summary Schedule Status

• Completion has slipped one month since our October report.

• Reasons for the delay:

– Software slipped one month (due to sickness and Lick software emergencies) and is on the critical path.

– We discovered flexure in the detector support train and must remove the dewar to fix it.

– The grating transport/insertion mechanism is requiring substantial redesign.

– CARA cannot accept DEIMOS until Oct. 1, 2001.

4

Summary of Critical Path

• Software dominates until testing begins.

• Grating implementation and flexure repair have only about 2 weeks float.

5

ID Task Name Duration Start Finish PredecessorsResource Names% Complete

135 Software 142.5 days Mon 10/9/00 Tue 5/8/01 15%

182 grating tilt 15 days Fri 1/5/01 Thu 1/25/01181 Dean Tucker 15%

183 slitmask 15 days Fri 1/26/01 Thu 2/15/01182 Dean Tucker 0%

184 Grating select control 15 days Fri 2/16/01 Thu 3/8/01183 Dean Tucker 0%

185 hatch 5 days Fri 3/9/01 Thu 3/15/01184 Dean Tucker 0%

186 low res temp monitoring 5 days Fri 3/16/01 Thu 3/22/01185 Dean Tucker 0%

187 Peizocontrol 10 days Fri 3/23/01 Thu 4/5/01186 Dean Tucker 0%

188 Slit Mask tests 2.5 days Fri 4/6/01 Tue 4/10/01187 Dean Tucker 0%

189 Grating tilt refine 5 days Tue 4/10/01 Tue 4/17/01188 Dean Tucker 0%

190 Environmental control KW 2.5 days Tue 4/17/01 Thu 4/19/01189 Dean Tucker 0%

191 global KW test 2.5 days Fri 4/20/01 Tue 4/24/01190 Dean Tucker 0%

192 power control KW 5 days Tue 4/24/01 Tue 5/1/01191 Dean Tucker 0%

193 UPS Software control 5 days Tue 5/1/01 Tue 5/8/01192 Dean Tucker 0%

219 Instrument tests 8 wks Tue 5/8/01 Tue 7/3/01175,31,193 0%

221 FLOAT 3 days Tue 7/3/01 Fri 7/6/01219 0%

222 Pre-ship Review 0 days Fri 7/6/01 Fri 7/6/01219,221 0%

223 Post Pre-ship review 40 days Fri 7/6/01 Fri 8/31/01222 0%

224 Post Pre-ship Review 4 wks Fri 7/6/01 Fri 8/3/01219,222 0%

225 Disassemble DEIMOS 4 wks Fri 8/3/01 Fri 8/31/01224 0%

226 Pack and Ship 64.5 days Fri 8/17/01 Thu 11/15/01 0%

227 Pack 3 wks Fri 8/17/01 Fri 9/7/01225SS+2 wks 0%

228 Truck to Oakland 2 days Fri 9/7/01 Tue 9/11/01227 0%

229 Marine Shipment 14 days Tue 9/11/01 Mon 10/1/01228 0%

233 Assemble in HI 41.25 days Mon 10/1/01 Tue 11/27/01 0%

272 Full up instrument tests 8 days Tue 11/27/01 Fri 12/7/01271 0%

273 FIRST LIGHT 0 days Fri 12/7/01 Fri 12/7/01272 Sandy 0%

274 First Commissioning run 3 days Fri 12/7/01 Wed 12/12/01273 0%

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

Dean Tucker

7/6

12/7

Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan2000 Qtr 4, 2000 Qtr 1, 2001 Qtr 2, 2001 Qtr 3, 2001 Qtr 4, 2001 Qtr 1,

Summary of Critical Path

6

Milestone SummaryAs of CurrentOct 14, 2000 date

• First image of spectra Oct 24 Done

• Meeting plans to fix flexure Oct 26 Done

• Slit mask system released to SW for functional tests Jan 19

• Rotation drive re-installed & under SW control Jan 8 Jan 21

• Grating system operational Feb 5 Mar 8

• Instrument ready for integrated systems testsApr 4 May 8

• Preship review June 7 July 7

• Marine Shipment Aug 9 Sept 11

• First air shipment and start of assembly Aug 21 Oct 1

• Hoist instrument into dome Aug 24 Oct 4

• Dewar installed Oct 3 Nov12

• First star light Oct 30 Dec 7 (dark)or Dec 28 (full moon)

7

Progress Since Last Report

• Dewar system installed in DEIMOS (October 16); works well.

• Direct images and spectra taken with blue science mosaic.

• Flexure investigations using full mosaic detector completed.

• Software developed to analyze flexure and optical quality.

• Plan to address major source(s) of flexure developed.

• Major progress on grating transport/insertion system .

• Slit mask system under computer control.

• Calibration lamp and flat field illumination systems installed and tested.

• Flexure control system installed and tested.

• Dewar focus, dewar X stage, science filter wheel, calibration lamps, and shutter operated under keyword control and tested using automated scripts; now are working systems.

8

Dewar System in DEIMOS

9

Slit mask system insertion scissor lift

10

Calibration lamps with slit mask form at bottom of picture

11

Picture of spectra from 900 line grating

12

Other Progress

• Linux computer for rotation control purchased and outfitted with Galil motor control system. DEIMOS rotation under computer control by end of January.

• Engineering GUI in use.

• Leach II video boards for 16-amp operation received.

• Dewar ion pump power under software control.

• Hewlett-Packard temperature sensor data logged remotely over network; 24/27 sensors installed.

• Power PC board mounted in test CCD controller for 100 Mb ethernet video connection; being tested.

13

Technical Concerns

• Fixing flexure in grating box and other sources

• Extensive redesign of grating sliders is required; integrating grating system with all sliders mounted will occur late.

• Possible redesign of retraction “hotdog” for slit mask system

• Availability of high-rho CCDs for red mosaic; testing red mosaic out of spectrograph after DEIMOS is shipped

• Implementing complex rotation control system

• Telescope baffling

14

Image Quality

• Image quality tested by direct images and spectra through pinhole/slitlet-mask. Hole diameter = slitlet width = 0.5 arcsec = 4 pixels.

• All images show radial coma, with maximum length approximately 20 pixels at detector edges (see plot). In addition, a small amount of constant coma appears to be present.

• FWHM data on good images is about 4 pixels, as expected.

15

Image Quality (cont’d)• Possible sources of radial coma: symmetry says must come from

camera.– Bad aspheric surfaces on Elements 7 and 8. But this was not seen

in Optical Shop testing.

– Improper spacing between Element 8 and Element 9 (field flattener). This is possible, as parts were substituted between tests. Easy to fix.

• Possible sources of constant coma: symmetry says must also come from camera.– Tilt or displacement of Multiplet 4.

– Tilt or displacement of Element 9.

– Either of these can be largely nullified by the decentering adjustment on Multiplet 4. Easy to fix.

• Conclusion: Greater care in installing Element 9 and dewar (and possibly decentering Multiplet 4) should cure problems.

16

Picture of aberration

17

Other Optical Results

• Fringing is less than 4% peak to peak; we had been planning on 20%. Flat-fielding will be easier than expected.

• CCDs 1 and 4 in the blue mosaic are high-rho engineering-grade devices from Lot 14. They are exactly like the science-grade high-rho devices from this lot except they have a poor anti-reflection coating and low QE. Their PSFs are good, showing that the red science devices will have acceptably sharp PSFs.

• CCD 7 is a high-rho red-sensitive prototype from Phase 1 that we had been counting on. Its images have “wings” and slightly high FWHM. We no longer consider this suitable for the red mosaic and have relegated it to a spare.

18

Other Optical Results (cont’d)

• The wavelength calibration system contains Hg, Ne, Ar, Xe, Kr, Cd, and Zn lamps. There are many dim but highly usable spectral lines in the blue.

• The internal quartz continuum lamp is dim in the blue an has broad spectral “features” impressed by the fiber feed system. However, it is usable now and can be improved later if time permits.

• The flexure compensation spectra look good. They land on the FC CCDs and have spots of good brightness and spectral density.

19

Flexure

• Restatement of problem: peak to peak image motion of 40 pixels (600 microns) when DEIMOS is rotated. Roughly 26 pixels ascribed to grating box. Range of motion of FC system is only 20 pixels peak to peak.

• Progress since last report:

– In-house review (Oct 26) recommended three strategies: 1) Brace existing grating box with elbow braces. Tried, gave little

improvement.

2) Remove grating box, strengthen, weld, and replace. Due to be implemented Feb 1, results by Feb. 15.

3) Replace grating box with new system based on 4-5 tripods attached directly to drive disk. We are beginning to study this and will implement if necessary.

20

Flexure (cont’d)

– Direct images of detector inside dewar showed ~6 pixels flexure peak to peak. Dewar is being removed and disassembled to fix this. Replaced Mar. 15.

– Analysis scheme was developed using ghost images and higher-order distortions to disentangle collimator, tent mirror, grating, and detector motions. Very promising.

– Present image rotation is a little less than 2 pixels peak to peak at edge of detector. Error budget is 1 pixel peak to peak.

21

Grating box with slider 2at top

22

Grating System

• All parts fabricated (original design).

• Grating tilt system is entering keyword control.

• Grating insertion system is being tested with slider 2 and imaging mirror.– Clamping mechanism passed initial tests.

– Slider body flexes slightly under rotation. Needs reinforcing.

– “Hand-off” mechanism needed rework; too floppy. New design seems to work well.

– Capture range of homing pin seems comfortably longer than flexure of drive-screw system.

– Final end-to-end tests of slider 2 expected next week.

23

Grating System (cont’d)

• Grating sliders are heavier than slider 2.– Their hand-off mechanisms are harder, due to extra weight and grating

tilt complexity.

– Slider 1 is very heavy – carries 8 x 12 grating. Latest vignetting study indicates only 5% light gain.

– WE PROPOSE TO REPLACE SLIDER 1 WITH A VERSION OF SLIDERS 3/4.

• Concerns:– Complex redesign of sliders 3 and 4.

– Greater weight and flexure with all four sliders installed.

– Final integration of grating system will come late, after reinstallation of grating box.

24

25

Red CCD Mosaic

• The second distribution of Lot 14 MIT/LL high-rho devices has occurred. Our allotment of high-rho devices is as follows:

6 excellent science-grade devices1 very good spare, possibly science-grade if operated cold enough1 acceptable spare (CCD 7 in blue mosaic)1 B-grade device not suitable for science mosaic

• We need 1-2 more science-grade devices to fill out the red mosaic. Possibilities for getting these include:– Six more CCDs are due to be packaged from Lot 14, of which we

would get 1.

– Luppino may be able to trade us 1-2 devices, depending on availability.

– We may be able to trade devices with ESO, who have a surplus.

26

Red CCD Mosaic (cont’d)

• We should know about the Luppino trade by March 1.

• CARA have accepted our plan to assemble and lab-test the red mosaic AFTER the Pre-Ship Review, pending a review of our test plan.

27

Major Schedule Concerns

• The grating insertion mechanism re-design needs to be successful; the full-up system with all sliders needs to work as well as slider 2 alone.

• Planned fixes of flexure need to work, and our diagnosis of the sources of flexure needs to be correct.

• Software continues on critical path. Delays will result if key software people are distracted or hit by illness.

• No surprises in switching to 16 amp read-out of the mosaic.

• We assume that we can integrate the “red” mosaic after the Pre-Ship Review.

• We have agreed with CARA to postpone mask fabrication at CARA until after DEIMOS commissioning. This eases the software schedule by about 3 man weeks.

28

ID Task Name Duration Start Finish

1 Engineering 230.5 days Mon 9/18/00 Fri 8/17/01

42 Instrument Lab 220.5 days Mon 10/2/00 Fri 8/17/01

43 DEIMOS General 161 days Mon 10/2/00 Fri 5/25/01

71 dewar 93 days Mon 10/30/00 Tue 3/20/01

72 modify LN2 can 20 days Thu 2/1/01 Wed 2/28/01

73 repair dewar focus stage 10 days Mon 10/30/00 Fri 11/10/00

74 repair flexure in dewar 30 days Tue 1/16/01 Mon 2/26/01

75 reinstall dewar in instrument 3 days Fri 3/16/01 Tue 3/20/01

76 grating 211 days Mon 10/9/00 Fri 8/10/01

77 Support of flexure measurements 10 days Mon 10/9/00 Fri 10/20/00

78 Intergrate grating system 63 days Mon 10/9/00 Tue 1/16/01

79 Modify grating box for flexure 15 days Thu 2/1/01 Wed 2/21/01

80 Test modified grating box 15 days Thu 2/22/01 Wed 3/14/01

81 intergration of grating box continued 1 day Fri 3/30/01 Fri 3/30/01

82 Grating testing support: grating select 5 days Thu 4/5/01 Wed 4/11/01

83 Grating testing support: tilt 7 days Mon 1/8/01 Tue 1/16/01

84 Pin, disassemble, and blacken grating system 25 days Mon 7/9/01 Fri 8/10/01

85 Camera 142 days Mon 10/9/00 Mon 5/7/01

89 Slit Mask System 178 days Wed 11/29/00 Tue 8/14/01

97 Shipping 99.5 days Mon 4/2/01 Fri 8/17/01

98 build main shipping container 60 days Mon 4/2/01 Fri 6/22/01

99 Build misc shipping boxes 15 days Mon 6/25/01 Fri 7/13/01

100 Secure barrel to carriage for shipping, etc 10 days Fri 8/3/01 Fri 8/17/01

101 Electronics 176 days Mon 10/9/00 Fri 6/22/01

120 Software 142.5 days Mon 10/9/00 Tue 5/8/01

145

199 test 16 amp readout 20 days Mon 3/5/01 Fri 3/30/01

200 Install 4 video boards in CCD controller for 16 amp readout 5 days Mon 3/5/01 Fri 3/9/01

201 Make, install, and test New red science mosaic 10 wks Fri 6/1/01 Thu 8/9/01

202 Instrument tests 8 wks Tue 5/8/01 Tue 7/3/01

203 FC software 10 wks Mon 4/2/01 Fri 6/8/01

204 FLOAT 3 days Tue 7/3/01 Fri 7/6/01

205 Pre-ship Review 0 days Fri 7/6/01 Fri 7/6/01

206 Post Pre-ship review 40 days Fri 7/6/01 Fri 8/31/01

Terry P

Terry P

Terry P,David C

Jeff

Dick

Dick

Dick

Dick

Dick,Lynn

Matt T,Gary

Matt T,Gary

Dick

7/6

Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr2000 Qtr 4, 2000 Qtr 1, 2001 Qtr 2, 2001 Qtr 3, 2001 Qtr 4, 2001 Qtr 1, 2002 Qtr 2,

Thumbnail of DEIMOS Schedule

29

ID Task Name Duration Start Finish Predecessors

222 Pre-ship Review 0 days Fri 7/6/01 Fri 7/6/01219,221

223 Post Pre-ship review 40 days Fri 7/6/01 Fri 8/31/01222

224 Post Pre-ship Review 4 wks Fri 7/6/01 Fri 8/3/01219,222

225 Disassemble DEIMOS 4 wks Fri 8/3/01 Fri 8/31/01224

226 Pack and Ship 64.5 days Fri 8/17/01 Thu 11/15/01

227 Pack 3 wks Fri 8/17/01 Fri 9/7/01225SS+2 wks

228 Truck to Oakland 2 days Fri 9/7/01 Tue 9/11/01227

229 Marine Shipment 14 days Tue 9/11/01 Mon 10/1/01228

230 Airshipment 1 1 day Mon 10/1/01 Tue 10/2/01229

231 Airshipment 2 1 day Mon 10/15/01 Tue 10/16/01240

232 Airshipment 3 1 day Thu 11/15/01 Thu 11/15/01262

233 Assemble in HI 41.25 days Mon 10/1/01 Tue 11/27/01

272 Full up instrument tests 8 days Tue 11/27/01 Fri 12/7/01271

273 FIRST LIGHT 0 days Fri 12/7/01 Fri 12/7/01272

274 First Commissioning run 3 days Fri 12/7/01 Wed 12/12/01273

7/6

12/7

Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb2000 Qtr 4, 2000 Qtr 1, 2001 Qtr 2, 2001 Qtr 3, 2001 Qtr 4, 2001 Qtr 1, 2002

Schedule, PS to Commissioning

30

CARA Preparations Needed• Extend the N platform.

• Deflection of N platform under DEIMOS load.

• Design, fabricate and install the cable boom.

• Install the N tracks on the DEIMOS side.

• Increase the elevation axis telescope cable wrap.

• Test carriage mover.

• Produce a drawing for the DEIMOS lift into the observatory.

• Run air, glycol, co-ax fiber and power lines to the cable boom.

• Mount and install DEIMOS computers and disk drives.

31

CARA Preparations Needed (cont’d)• Interface control document

• Guider work - software - Lick

• Configuring of accounts

• Data archive to tape

• Telescope interlocks

• Preparation for slit mask

• Cryogen Handling

• Documentation specification

• Commissioning and characterization, image reduction

• Documentation of instrument procedures

• SW for instrument control and initialization