Download ppt - 9/24/05MagE Update SAC meeting Developments with MagE Complete layout of Spectrograph structure and camera by B. Bigelow –Structure will be all anodized

9/24/05 MagE Update SAC meeting

Developments with MagE

• Complete layout of Spectrograph structure and camera by B. Bigelow– Structure will be all anodized aluminum + bolts (like MIKE).

– Fabrication drawings exist for grating and prism assemblies, first mechanical pieces are being fabricated in MIT shop.

– All optics in hand, or to be delivered next month• Have coating quotes from OCLI, ZC&R and hybrid Sol-gel curves from CCI.

• Have contacted DRC metrigraphics to procure an “electroformed” slitmask.

• Working through design of mounting CCD on Si02 meniscus

– CCD repackaging on engineering grade e2V 42-20 did not deliver same characteristics as before removing wire bonds.

• Ian has details

• We’ll go with standard stock packaging for commissioning. (~7% hit in eff.)

– Converging on solutions to locate CCD mount on dewar window (Si02)

– Have arrived at initial designs to run cold finger, and electronics while minimizing obscuration in the beam.


(Old collimator assembly)

Calibration lamp system

Slitviewing system

Layout as of last SAC meeting



Optional handles added to prism cells to aid removal


Slit viewer in instrument

Note reliefs in mounting plate to clear optics and light path


Electroforming process by DRC, versus standard etching results.

Nickel-Cobalt is the standard electroplated metal.


Front, center, and rear barrel assemblies. New recessed rear cover.


Latest CCD mount design


Double Pass Prism


Single-Pass Prism


From Brent Gross, Cleveland Crystals



Developments with MagE

• Optics to be finished (with coatings) by end of ‘05

• Cable wrap with Igus chain to be better integrated with Aux port rotator

• Electronics and control can be PLC driven, with only 110V and ethernet needed into MagE electronics box.

• Plan to complete spectrograph and send to Carnegie in Summer ‘06

• Would be ready to ship to LCO at end of ‘06.