|
|
|
Report to the SSC |
|
Sept 10, 2001 |
|
|
|
|
DEIMOS on tracks and moved onto kinematics
mounts |
|
All stages under keyword control including
grating transport |
|
Gratings clamp up at all positions |
|
Optical alignment done |
|
FC spots on both FC detectors for stages for all
stages |
|
X and Y FC stages characterized |
|
|
|
|
|
|
TV mounted, image motion 3 arc sec (pk-pk),
rotation small |
|
LN2 can complete and in testing |
|
Readiness Review held on Aug 21-23 |
|
|
|
Tractor testing to start this week |
|
Pre Ship Review planned Sept 24-25 |
|
|
|
|
|
|
Sept 24-25 Preship Review |
|
Oct 8 Start disassembly |
|
Nov 2 Ship mainframe via sea |
|
Nov 8 Mainframe arrives on big island |
|
Nov 15 Hoist MF into K2 dome |
|
Nov 26-30th Test tractor and
kinematics on K2 |
|
Dec 6-10th Install slitmask system |
|
|
|
|
Dec 10-17th Install grating system |
|
Dec 18-10th Install TV system |
|
Dec 22-Jan 5th Home for Christmas |
|
Jan 8-10th Test nose area systems |
|
Jan 11th Install camera |
|
Jan 17th Install dewar |
|
Jan 24-30th Alignment |
|
Jan 31-Feb 14th Testing |
|
Feb 28th First Light |
|
|
|
|
|
What Sandy can do now: 10 hours/day |
|
Sit in recliner chair |
|
Get around house slowly with walker |
|
Talk on phone/conference calls |
|
Send/receive faxes |
|
Write longhand |
|
Read/think |
|
2. Added activities this next week: |
|
Computer and e-mail |
|
|
|
|
|
|
|
Ways in which Sandy will be able to help more: |
|
Talking to key people more frequently |
|
Merging information |
|
Minute-to-minute planning with Dave and other
unit leaders |
|
|
|
|
|
|
|
Ways in which Sandy will be able to help less: |
|
Reduced oversight and motivating role in
Instrument Shop |
|
Reduced insight into test results |
|
No image analysis |
|
Less Zemax modeling, including loss of
room-temperature Zemax model for current optical performance (had been
promised at PSR) |
|
Net result: |
|
Better high-level functioning |
|
Reduced low-level functioning |
|
|
|
|
|
Slider 2 (mirror, direct imaging) |
|
X=9 px pk-pk, y=14 px pk-pk |
|
Rotation: 0.5 px pk-pk center to edge |
|
Slider 3 (grating) |
|
X=20 px pk-pk, y=13 px pk-pk |
|
Rotation: 1.3 px pk-pk center to edge |
|
Slider 4 (grating) |
|
X=16 px pk-pk, y=9 px pk-pk |
|
Rotation: 0.7 px pk-pk center to edge |
|
|
|
|
|
|
|
|
|
Slider 3 was predicted by FEA to be the worst
case |
|
Marked hysteresis is present depending on PA
rotation direction; working FC system is needed |
|
Grating transport system increases flexure when
grating inserted at PA angle 0 degrees on sliders 3 &4 (we are working
on this) |
|
Capture range of FC system (from actual tests) |
|
X=26 px pk-pk, y=21 px pk-pk |
|
|
|
|
Collimator 4 4 |
|
Detector 4 4 |
|
Camera* 13 13 |
|
Grating box 5 5 |
|
Grating sliders 6 6 |
|
*Also affect image quality: variable comatic
tails |
|
|
|
|
|
|
Curing flexure in camera is expected to reduce
the observed x flexure greatly but increase y flexure a small amount |
|
|
|
|
|
|
We believe that it is either cell 4, which has
three degrees of adjustment designed into it, or element 3, which is
coupled to its cell with shims. All other elements are cemented into place
with the exception of element 5, which is held in place by elements 4 and
6. |
|
|
|
|
|
Motion in camera confirmed by two independent
methods |
|
Double-pass test using a point source at the
focal plane, a mirror at the front of the camera, and the Cohu detector,
does not need spectrograph or science detector |
|
Analysis by of ghost images taken with the 900
line grating; separately measured detector motion must be subtracted off |
|
Two test agree well |
|
|
|
|
|
|
Original tests in the optics lab did not look
for image motion. We tested for image quality using a microscope and the
Cohu detector on and off axis. The off axis tests were done at 4 different
position angles of the camera by rotating the camera |
|
|
|
|
Mahr gage tests directly measuring the motion of
cell 4 using pre-existing holes in the camera body. |
|
Pinhole test which will look at the shadows of 2
rings on the back face of element 8 in cell 4. From the magnitude of the
motion, we should be able to determine where the moving element in the
camera is. |
|
|
|
|
|
|
Repeat the double-pass test with the Cohu
detector and fiber once dewar is removed from DEIMOS; this will be the key
diagnostic test used in the optical lab during the repair process. Measures
both the image motion and image quality. |
|
|
|
|
Remove the camera from DEIMOS and mount it in a
horizontal rotator in the Optics lab, and repeat the double-pass test using
the Cohu camera. The camera was in this rotator for the initial optical
tests following assembly |
|
|
|
|
|
Remove camera from rotator and disassemble cell
4 from camera. |
|
Test cell 4 for flexure using Mahr gauges |
|
Note this cell has both radial and axial
flexures |
|
If translation is caused by radial flexures,
remove and replace springs |
|
If translation is caused by axial flexure,
re-make flexures |
|
|
|
|
|
If flexure not found in Cell 4, further
disassemble camera to Cell 2 which holds element 3 of the camera |
|
Problem may be with shims between element and
cell. They may be too small or have fallen out. If so, they will be fixed. |
|
Reassemble camera and test in rotator using the
double-pass test and the Cohu detector |
|
|
|
|
|
|
Oct 8th Double-pass test with
Cohu detector following removal of dewar |
|
Oct 9th Removal of camera from
DEIMOS |
|
Oct 10-16th Camera tests in Optics
Lab |
|
Oct 17-Nov 5thDisassemble, test and
repair |
|
|
|
|
Nov 5-9th Assemble camera |
|
Nov 12-16th Test camera on test
stand |
|
Nov 18-20th Disassemble and pack
camera |
|
Nov 26th Ship to Hawaii |
|
Nov 27-Dec 3rd Assemble camera in HI |
|
Jan 11th Install camera in
DEIMOS |
|
|
|
|
|
|
Testing camera outside DEIMOS in optical lab is
not deemed a major risk; Cohu test is good |
|
Risk 1: task is straightforward but takes longer
than planned; Vernon Wallace needed to repair camera (ends Nov 26) and to
install slitmask system (Dec 3) |
|
Mitigation- Jeff Lewis is experienced with
installing slitmask system |
|
|
|
|
|
|
Risk 2: Solution requires major rebuild of Body
4 axial flexure |
|
Mitigation: We have thought of a better way to
fabricate these flexures |
|
Conclude: Less risk to overall schedule by
shipping DEIMOS while repairing camera here |
|
|
|
|
Larger image motion when slides clamped at PA 0;
need to fix this |
|
Finish trolley and test |
|
Adequate test time for all stages; time to
analyze and digest test data |
|
DS 9 |
|
Observers GUI |
|
Camera flexure (after PSR) |
|
Commission Slider 5 (after PSR) |
|
Red Science array (after PSR) |
|
|
|
|
|
|
|
Notes