IMACS progress report no. 57

B. Bigelow						13 January 2003

I)	Project Status

Currently scheduled tasks:					Status:


a)	DSS drive assembly/testing (Hare, Kowal)		IP
b)	Calibration system mech. des. (Hare)			IP 
c)	CCD array testing (Thompson/Burley)			IP
d)	Dewar/Detector final integration (Thompson/Burley)	IP
e)	Grism procurement (Sutin)				IP
f)	Grism cell fabrication (Kowal)				IP
g)	Instrument electronics assembly (Bagish)		on sched.
h)	Control software design (Birk)				on sched.
i)	Short Camera opto-assembly (Bigelow)			IP
k)	IFU design and build (U. Durham)			IP

Project events in December:

 - all instrument functions are now under script control
 - automated flexure testing started
 - first laser cut slit masks delivered from LCO laser system
 - instrument utility wrap fully assembled and installed
 - IFU mass dummy delivered by U. Durham, successfully tested in mask server
 - short camera assembly nearing completion
 - enclosure (walk-in refrigerator) ordered for instrument thermal testing
 - initial preparations for IMACS shipment to Chile started

Latest project images:

Final Assy:        http://www.ociw.edu/instrumentation/imacs/devel/final/index.html
Enclosures:	   http://www.ociw.edu/instrumentation/imacs/devel/enclosures/index.html

II)	Optics (Sutin)

* The replacement S04 arrived.

* Both the 300 and 600 l/mm grisms are at ThermoRGL, having their rulings
  applied.

* The replacement dewar window is being figured at TORC.

* The echellette prism is being fabricated at Zygo.

* I spent most of the holiday break with Alan D., testing IMACS and
  fixing and calibrating numerous aspects of IMACS.

III)	Electronics (Bagish)

 - Repaired intermittent internal short found inside Mask Server cable.
 - Designed and ordered kit of parts for Science and Guider camera power supplies.
 - Wrap placed in position on instrument. 

To do:

- Wire up remaining subsections.
- Attach RTD thermal sensors to instrument.
- PI Enclosure: mount components, wire and plumb.

Machining tasks:
        
        Science and guide camera base-plates.
        Guide camera front panel.
        3 Corcom power entry mounting plates.
        MCS panel 4.
        
 - Finish, anodize and engrave science and guider camera power supply front panels.
 - Design, machine, anodize and engrave science and guider camera instrument end 
   bulkhead.
 - Install fiber cables into cable wrap.
 - Order an additional data acquisition unit for temperature measurements, MCS power 
   supply voltages and science and guider camera power supply voltages.
 - Assembly of three science and guider camera power supply chassis.
 - Specify and install science camera focus motor connector.
 - Increase sensitivity of mask position sensors.
 - Add LED hard-stop indicators into MCS chassis.

IV)	Software (Birk/Clardy)

Birk:

* Science Array Software
  - features added to quick-look tool
  In January I will make changes and additions (e.g. flip images,
  add binning to sub-raster-files, etc) that were found useful
  during extensive use for flexure tests in December.

* Instrument Control
  - MechGUI (user level): control loops added (PR-theta, SH-theta, 
    SH-radius,gratings)
  - fine tuning of access-control to serial ports
  - EngGUI (mid level): scripting added and tested. 
  During January I plan to add scripting to the user-level GUI (MechGUI).

* Flexure Control
  - piezos show greatly reduced motion capability at -100 C. It is
    planned to better insulate the piezo-stage from the CCDs.

* LO5 Control
  - motor #1 stopped working. A replacement has arrived and will be
    tested in January.

* Documentation
  - I started the documentation by writing up a description of all
    low level GUIs.    

Clardy:  

The program to produce machine commands to laser-cut masks has
produced a complete mask.  It should be able to produce any mask,
since only the data are changed, the basic commands are similar.

A center field mask was produced, and will be carefully measured to
find information on the cutting beam width.  The engraving of some
lines on this mask leave much to be desired, so their feed rate will
be adjusted.

A test mask has been used to take pictures of spectra; these will be
used for a first attempt at checking the optical subroutines.  These
subroutines are being integrated into the mask generation system to
predict spectra locations on the detectors, and to find star positions
at the mask (using the telescope optical distortions), as well as to
predict pixel locations for data reduction.

V)	Detector Systems (Thomson/Burley)

No report this month.

VI)	Mechanics (Bigelow/Hare)

Bigelow:

In December:

1) Filled and strain-relieve hoses and cables in utility wrap
2) Revised filter server insertion mechanism, drafting started
3) All oil gaps measured in short camera - all met spec except S07-S08
4) Selected and ordered Bally enclosure for thermal testing
5) Installed short camera filter server
6) Pinning blocks designed, manufactured, and installed for both FSS
7) Produced draft plan for instrument assembly at Magellan
8) New cooling straps designed and fabricated for CCD science array
9) Installed long camera baffles
10) Potted replacement (2nd) S04 lens in cell
11) Designed and ordered counter-balance mass assemblies for structure

For January:

1) Complete short camera assembly
2) Complete liquid cooling plumbing design
3) Assemble Bally enclosure for thermal testing
4) Pot 200 l/mm grism
5) Install structure counter-balance mass assemblies

Hare:

Current Work

 * Investigating noise in the drive assembly on the Principle Guide Camera.
 * Working to resolve a problem with the near/home function (encoder) on the Grating 
   Tilt Mechanism.
 * Redesigning main encoder mounting bracket for the Disperser Server.  Current 
   design doesn't provide for adequate adjustment.
 * Reassemble and test Clamp Assembly with redesigned locating components.
 * Testing and calibration of both shutter units.

Future Work

 * Mount optics and reassemble guide cameras as needed.  Continue assembly, testing, 
   and rework of all guide cameras as necessary.
 * Continued flexure testing and performance evaluation of the Grating Tilt 
   Mechanism.
 * Assembly and testing of Disperser Server System, including drive and cable wrap 
   sub-assemblies.
 * Resume design work of the Calibration Unit.


VII)	Fabrication (Kowal)

December's Report:

1) Made new CCD saddlebags.
2) Completed new stainless latch mounting blocks for DSS.
3) Three Cryotiger Covers are finished.
4) SA Controller parts are done.

Expectations for January:
    
1) New Cryotiger mount
2) Remainder of Alan Bagish's plates
3) Grism Cells or remainder of GTMs

VIII)   IFU (J. Schmoll, U. Durham)
Optics: 

- Lenslet arrays: Just ten more arrays delivered until Dec. 18, from
which are three with faults.  Another batch expected soon, but testing
will be done in January.  Due to the slow progress a delay is expected
here.

- Fiber glue: Finally a source for a new epoxy was found. Still
waiting for a quote.  A test bundle will be put into a small array to
simulate the gluing procedure. No problems are expected but it is
necessary to be on the sure side here.

Mechanics: 

- IFU dummy manufactured and sent to OCIW.
 
- Mask slit plate plans sent off to manufacture (workshop).

- No news here.

Procurement:

- Armstrong glue AB9190 probes arrived for checks. Still waiting for a quote.

- IAD coating: Will be ordered and the arrays sent in when output
arrays arrive and quality is sufficient. Has still to wait until all
arrays have been manufactured and accepted.

Schedule:

- Lost months schedule still valid, but delays strongly expected due
to the slow lenslet array manufacture and possible delays in epoxy
glue availability. New schedule will be produced in January when the
consequences of these delays are foreseeable.

Note:

- There will be a break between December 20 and January 13. While
further lenslets are expected to arrive from AOA, testing will be
performed in mid of January.
        
IX)     Other Business

Next meeting:  10:15 AM, 2/5/03