IMACS: Inamori-Magellan Areal Camera and Spectrograph

21/22 September 2002 IMACS update 1

IMACS:Inamori-Magellan Areal Camera and

Spectrograph

Magellan SAC Status Report

21/22 September 2002

Boston, MA


IMACS project team:

A. Dressler Pr. Investigator

B. Bigelow Instrument Scientist

B. Sutin, H. Epps Optical des./eng.

B. Bigelow, T. Hare

S. Gunnels, G. Luppino,

R. Cleary Mechanical des.

V. Kowal, R. Storts, J. Castillo Mechanical fab.

A. Bagish, D. Carr, J. Asa Electronics

G. Burley, I. Thompson, J. Estrada Detector systems

C. Birk, K. Clardy Software eng.


Optics Status:

Collimator:

C01 (Field lens) Done, installed

C02 - C05 Done, installed

Long Camera:

L01-L06 Done, installed

Short Camera:

S01, S08 At Tinsley, near completion

S02,3,5,7,9 Done, ready to mount

S04 At TORC, second blank

S03, S09 Mounted in cells


Carnegie S01 Aspheric lens, Global surface figure error based on average

of two full aperture grid measurements

RMS = .215 waves / 244mm CA.

RMS Slopes of this global grid when frequency filtered for periods of 1cm and longer = 18 u-radians.


Carnegie S08 Aspheric lens,

Global surface figure error based on average of two full aperture grid measurements

RMS = .216 waves / 224mm CA.

This is preliminary data. We are going to re-measure the 90 rotation half of these and Re-average with zero. Slope measurements with fine line scans are being acquired.


Optics Status cont.

Filters: 2 sets of CTIO B,V,I, Done

2 sets of CTIO R Done

CTIO U (LCAM) Awaits ADC coating

Sloan u’, g’, r’, i’, z’ Not ordered

Grisms: 200 l/mm Done, ready to mount

300 l/mm Polishing at HJOL

600 l/mm At STF for AR coating

Imaging Mirrors: Al mirror mounted

Ag mirror done


200l/mm grism delivered


First light!

07/18/02


Mechanical Engineering Status:

Guide camera stages (Hare) Done, mounted

Calibration lamp system (Hare) IP

Mask server (Bigelow) Done, mounted

Field Lens (Hare) Done, mounted

LCAM shutter (Hare) Done, mounted

Filter servers (Bond) Done, 1 mounted

Disperser server (Hare) Done, except drive

- Grating cells 2 of 6 mounted

- Grism cells Final design IP

- Mirror cells Done, 1 mounted


Mechanical Engineering cont.

Collimator mech. (Bigelow) Done, mounted

Long camera mech. (Bigelow) Done, mounted

Short camera mech. (Bigelow) Done, assy IP

Dewar (Luppino) Done, mounted

Instrument Structure (Gunnels) Done

Instrument Carriage (Gunnels) Done

Instrument Enclosures (Gunnels) Done, minor mods IP

Instrument Utility wrap (Gunnels) IP


Electronic Engineering:

Alan Bagish (OCIW) is completing the electronics design for IMACS. Joe Asa is providing final assembly services on a consulting basis. Status of electronics:

Schematics design (all motion stages) Done

(4) Motion control (MC) chassis, Done

(1) Power supply chassis, Done

(1) Shutter control chassis Done

(2) Electronics racks for chassis Done

Instr. wiring harnesses IP


Detector systems:

Guide cameras:

- 23 cameras have been fabricated

- IMACS currently has one of three needed

- Remainder by?

Science array:

- First light on 4 CCDs - 7/18/02

- Filled array of 8 CCDs flat to ~40 microns - not done

- Individual detectors flat to 13 microns

- Electronic/software integration IP


Slit Mask Cutting (Clardy) :

- Mask Generation (MG) IP

inputs - images, data files, other

output - text file with targets, names, etc.

- Mask Definition (MD) Done

- inputs - text file from MG, other text files

- output - mask definition file

- database for observing, data reduction

- Mask Fabrication (MF) Done

- inputs - mask definition file

- output - test, laser G-code, mill G-code, .ps files


Software:

Instrument Control (Birk)

Individual module testing:

Module GUI status H/W testsPr. Guider done 80%SH guider done 80%CF guider done 90%Slit Mask Server done 75%Disperser Server 50% 10%Long Camera Focus done 90%Filter Servers (2) done 90%Flexure Control done 75%Detector Focus 50% 10%HP Sensor System done 60%


Software:

Instrument Control cont.

Integrated instrument testing:

- One GUI at this level, showing all critical aspects of each module (encoder positions, limit status, temperatures, etc).

- This GUI is written and 75% tested, unfinished stages remain (Disperser Server, Grating tilts, detect. focus)

User Level Software:

- Two GUIs at this level:

- Instr. control interface (select a grating, etc.) - 60% done

- Graphical Instr. Status Display - 40% done


Software:

Science Array Control (Birk)

Shutter control:

- micro-controller for linear motors 90% done

- still need to test second (s-cam) shutter

CCD readout / camera control:

- “ccdserver” for array readout

- “camgui” for user interface

- both are functional 75% done

Quick-Look Tool:

- functional with *real* data 90% done


Slit Masks:

Laser system:

- Convergent Gemini 150 W. CO2 laser cutting system

- Installed and operational at LCO

ASB Facility upgrades:

- 200A electrical service Done

- Air compressor system Done

- Ventilation, fire, and fume extraction IP


Slit Masks:

Slit mask blanks:

- Fabricated by California Hydroforming

- First order of 100 mask blanks complete, at LCO

Mask fabrication cost:

- Estimated to about $150 per mask including laser

- Approx. $100 materials and hydroforming

- Approx. $50 for laser cutting (500 masks/year, 10 years)


Coming up:

- F/2 camera opto-mechanical assembly 9/02 - 10/02

- F/2 camera shutter completed by end of 9/02

- Utility wrap and wiring harnesses installed by end of 10/02

- Enclosure and hatch completed by end of 10/02

- DSS drive and GTM complete by end of 10/02

- Gratings and grisms in cells by end of 10/02

- Calibration lamps installed by end of 10/02

- Final testing 10/02-11/02

- Pack and ship by middle of 12/02?


Argon spectrum – 600 l grating, f/4 camera (09/18/02)

0.385 Å/pixel, ~0.8Å FWHM


The IMACS fiber positioning system...


IMACS confirms life on Earth: O2 lines (B-band) in red Solar spectrum


…holding the objects in the slits while guiding. Measurements are of the principal guider with respect to the slit mask. Good result.


Shack-Hartman guider relative to the slit mask. This guides rotation. Close to specifications (within spec if you consider only about 1 hour exposures), but there is a balance issue as the barrels are swapped that we should be able to overcome


Structure flexure with rotation is approximated by 0.6 arcsec circle. Hysteresis is minimal, ~0.3 pixels. Open loop correction should be sufficient for all but the most demanding spectral programs (stability better than 0.2 pix)

Piezo control

3-day test: 0, -90, -180, -270


Latest test of flexure of grating tilt mechanism. Spatial drift reduced to an acceptable level (<2 pixels = 0.20 arcsec) for full rotation of structure.

Grating rotation within acceptable range if motor/encoder can steer it out – yet to be confirmed.


Outstanding issues as of Sept ‘02

• Flexure of centerfield guider• Assembly and test of f/2 camera• Grating tilt mechanism – meeting specs• Operation of full 8K x 8K mosaic and test of full

field image quality

IMACS: Inamori-Magellan Areal Camera and Spectrograph

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