IMACS progress report no. 41

B. Bigelow						7 Sept 2001

	Project Status

Currently scheduled tasks:				Status:

a)	DSS drafting (Cleary)				IP 
b)	DSS fabrication (Kowal, Castillo)		IP 
c)	Filter server assy. (2) (Asa)			done
d)	Field lens mechanics fab (Martinez & Turek)	done
e)	Calibration system mech. des. (Hare)		IP 
f)	Collimator mechanics fab (M&T)			done
g)	Coll. opto-mech assembly (Bigelow)		IP
h)	Long camera fabrication (Martinez & Turek)	done
k)	Principal Guider Camera fab (Storts)		done
l)	Science Array controller fab (Burley)		95% compl.
m)	Short Camera drafting (Cleary)			IP
n)	Filter procurement (Sutin)			on sched.
o)	Grism procurement (Sutin)			on sched.
p)	Motion control (MC) electr. design (Carr)	95% compl.
q)	MC fab. (Asa)	    				50% compl.
r)	Control software design (Birk)			on sched.
s)	Instrument structure design (Gunnels)		on sched.

Project events in August:

The field lens, polished and coated, was delivered OCIW.

The field lens cell was completed by M&T and delivered to OCIW.

A contract for AR coating of the long camera lenses, and two
collimator lenses was let to Spectrum Thin Films.  The coated lenses
are due in mid-Sept.

Latest construction images can be seen on the IMACS web site:

http://www.ociw.edu/instrumentation/imacs

Check out new images of:

     Collimator lens and cell assembly
     Field lens and cell complete at OCIW

	Optics (Sutin)

 1) The field lens is here.  We don't have correct drawings of the
    shipping fixture yet.  We also do not have cleaning and handling
    directions for Sol-Gel coatings.  We are supposed to have both.
    The coating is also slightly out of spec towards the blue.  The
    coating is broad enough that this is not a major effect.

 2) France goes on vacation in August, so not much has happened with
    REOSC.  We are losing confidence in their ability to confirm to us
    that they have made the correct optic.  They have been slow to
    communicate.

 3) It is a good thing that Alan told me to nag Barr over the filters,
    because Barr seems to be out to lunch completely.  I've some guy
    up in the hierarchy (he has a private line) trying to find out
    what happened to our filters.  So far they seem to have ordered
    the glass.

 4) Spectrum TF has not been able to get rid of the peaks in the blue
    with a real coating, even though the theoretical says that they
    should not be there.  He has obtained a computer program which
    reverse-engineers applied coatings, and he intended to try it out
    on our coating materials.  I never heard any positive results.  We
    have given him a hard deadline to deliver the optics coated, peaks
    or not.

 5) Center field guider slit mask: Max Levy cost $3000.  I proposed
    making a cheesy version temporarily, and worrying about a nicer
    one later.

 6) Gunn Filters: Still waiting for a moment when both Ian and I are
    in the same place and have time to discuss these.

 7) The optical aspect of the Grisms are designed.  Only the
    mechanical aspects remain.

 8) S02 at TORC is almost finished.  The figure is perfect, but the
    surface has some sleeks.  The other lenses are in polish or ready
    for polish.  They are making the last test plates and tooling.

 9) Individual boxes for the filters are about $100 each.  We decided
    to consider boxes that hold five or so at a time instead.

10) I wrote the Carnegie part of an NSF grant to put a Fabry-Perot/
    tunable filter into IMACS.  The subcontract part to Carnegie is
    about $57K.

	Electronics (Asa/Carr)

Asa:

Accomplished August:

Filter Server 2: Assembly 99% complete.

Center Field Guide Camera: Testing Complete.

Electronics:  Chassis #2 25% complete.

To Accomplish in September:

Filter Server 2: Complete, test, and crate.

Electronics: Complete Chassis #2.

Guide Cameras:  Assemble Principle Guide Camera. Finish design of Shack
translation and stop brackets.

Dewar: Specify motor driver for focus motor, continue design of focus
limits.

	Software (Birk/Clardy)

Birk:

I successfully tested the CF-guider and implemented control software
in the engineering- and user-level GUIs.

I spent some more time experimenting with the 'Comtrol' serial hub and
really don't like it very much. David Murphy bought at similar product
from 'Equinox'. I tested it and it behaves exactly as I expected from
the other one too. We should talk about this when I come back from
LCO.

Finally PI answered my question about the problems with out piezo
controller. Somebody helped me over the phone to adjust a couple of
potentiometers to remove the vibrations on the detector mounting
stage.

For September I plan to test the 2nd filter server. But it may be late
in the month since I will back at SBS on the 10th, Joe is on a leave
from 9-5 through 9-15 and I will be on a vacation from 9-14- through
9-22.  Anyway, I don't see any problem here because filter-server #2
should be an exact copy of #1.

	Detector Systems (Thomson/Burley)

Ian was observing, reduced data, worked on debugging and repairing
guide cameras, and took some time off.

Greg was on vacation. He completed second generation signal processing
card design, and designed an extender card for the science saddlebags.

Jorge debugged and repaired guider cameras, worked on Magellan guider
assembly, and assembled 10 PCI cards, 5 science power boards, and 5
science clock driver boards. He also worked on the profilometer
software.

	Mechanics (Bigelow/Hare)

Bigelow:

In August:

1) Out of the office 8/6 - 8/27
2) Prepared to mount C02 lens in cell
3) Received revised mask cutter quotation from Laserdyne
4) Started design of modifications of SMS for CFG and long camera masks

For September:

1) Assembly of collimator lenses and cells
2) Progress laser cutter order 
3) Continue design of CFG and LCAM masks for SMS
4) Prepare for order of slit mask blanks
5) Continue support of structure design with Gunnels
6) Prepare for LCAM lens and cell assembly

Hare:

Current Work

* Testing and minor rework of the Center Field Guider continues.
* Assembly and testing of the Principal and Shack-Hartmann Guiders is underway.
* Fabrication of Field Lens Ring Assembly is now complete.
* Review of the design and drawing package for all sub-assemblies of the Disperser 
  Server continues.
* Continue to provide assistance with structure design issues as necessary.

Future Work

* Fabrication of the second shutter.
* Assembly and testing of all guide cameras.
* Continue revisions to solid models and part drawings of any subassembly as needed.
* Design and build tooling to mount the Field Lens into its cell.
* Review design of Disperser Server and continue work on the solid models.
* Resume design work of the Calibration Unit.

	Fabrication (Kowal/Storts/Castillo/Ramirez)

Kowal:

August's Report:

1) All three guiders are complete minus small pick up work and one base plate.
2) Grating Tilt mechanism uprights are finished
3) Five extra grating cells have been made. 
4) Grating Tilt mechanism base plates are in progress.

Expectation's for September:

1) Shutter # 2
2) Final machining of tilt mechanism once the bearings are received. 
3) Begin work on remainder of disperser server.

8)     Other Business

Next meeting:  10:15, 9/26/01