MMIRS 1

MMIRS MMT and Magellan Infrared

Spectrograph

Brian McLeod

MMIRS 2

Science Drivers – Brown dwarfs

MMIRS 3

Science Drivers – Star formation at high redshift

MMIRS 4

Basic Operational Modes

• Imaging• 7 x 7 arcminute FOV• 0.2 arcsecond pixels• Y, J, H & K wavelength coverage

• Spectroscopy• Multi-slit (4’x7’) or longslit (7’)

– J, H, K @ R=3000– H+K @ R=1400

MMIRS 5

Optical Layout

Corrector~20C

Slit Plane

Collimator

Camera

Detector

Sec II.1

MOS Section Camera Section77K

Design by H. Epps and D. Fabricant

MMIRS 6

Slit MaskDetector

MMIRS 7

CorrectorOptics(warm)

Guider/WFS(warm)

Detector

LN2 Tank/Optical Bench

Collimator

Camera

Slit Masks

Dekker

MMIRS 8

MMIRS EXTERIOR

TRUSS ELECTRONICSRACKS

(2) GUIDER/WFS

MOSSECTION

DETECTORPRE-AMP’S

CAMERA SECTION

TELESCOPE TRUSS- WELDED ASSEMBLY WITH BOLT INTERFACES TO TELESCOPE & CRYOSTAT

ELECTRONICS RACK TRUSS

(2)

MOS SECTION

MMIRS 9

MOS Wheel

MMIRS 10

Project Timeline

• TSIP Proposal Feb 2003• Start of Work Dec 2003• PDR July 2004• CDR May 2005• Optics ordered August 2005• Begin manufacture Oct 2005• Begin integration and test Summer 2006• Delivery to MMT Late 2007

MMIRS 11

Cryogenic benchesIn fab by Meyer ToolExpected delivery June 2006

MMIRS 12

Vacuum housings

• Contract awarded to Atlas Technologies

• Delivery expected August 2006

MMIRS 13

CartIn fabrication.

Delivery expected in approx one month.

MMIRS 14

OPTICS STATUSLens Status

1 IN POLISHING

2 IN COATING

3 ASPHERE--DROPPED WHEN NEARLY

COMPLETE – START OVER

4 RECEIVED

5 ABOUT TO BE COATED

6 ABOUT TO BE COATED

7 RECEIVED

8 IN COATING

9 RECEIVED

10 RECEIVED

11 RECEIVED

12 IN COATING

13 RECEIVED

14 RECEIVED

LENS9

LENS13

MMIRS 15

Grisms

Original Plan

JH R=1200HK R=1200J R=3000H R=3000K R=3000

Revised Plan

HK Prism R=1200 master already made for

UF at RGL. MMIRS will purchase identical.

J,H,K R=3000 3 order grism Master being made by

RGL for Florida.Option for cross-dispersion

MMIRS 16

Plan for next 6 months

• Detector characterization in test dewar

• Assemble main housings and G-10 rings

• Thermal/vacuum testing in September

• Build and test MOS wheel mechanism

• Finish remaining mechanical drawings