Contact Us:

4583 State Route 414

Beaver Dams, NY 14812

 

Phone: 607-654-2070

Fax: 607-654-2071

 

Email: info@pulseray.com

 

Designed to Exceed Your Expectations

Pulseray

Designed to Exceed Your Expectations

Pulseray

Designed to Exceed Your Expectations

APOGEE

ABSTRACT

The APOGEE Cryostat is a large (1.4m x 2.3m x 1.3m) stainless steel vessel that is LN2-cooled.  It will house a fiber-fed, NIR spectrograph that will be located in a building near the 2.5m SDSS telescope.  The choice of shell material and configuration was an optimization among optics packaging, weight, strength, external dimensions, rigging and transportation, the available integration and testing room, and the ultimate instrument room at APO.  Internals are fabricated of more traditional 6061-T6 aluminum.  An active thermal shield with MLI blanketing and no entrance window yield an extremely low thermal load of 45-50 watts for this ~3000 liter Dewar.

APOGEE is one of four experiments that are part of SDSS-III.

APOGEE Survey coverage

(distance from center)

Thermal shield with transparent top section.

APOGEE cryostat with major optics identified.  Camera alone weighs 150kg and has lenses up to 385mm.

APOGEE instrument room at Apache Point Observatory. SDSS 2.5m telescope at left in upper photo.APOGEE instrument room at Apache Point Observatory. SDSS 2.5m telescope at left in upper photo.

Thermal shield design performance is excellent with less than 20K temperature rise

Stress analysis and deformation show very solid characteristics of design and materials.

Underside of cold plate as hung in the waist section of the Dewar.  To the right of the plate is one of the three hangers. Cold plate is flat to 25 microns (.001”).

VPH being fab’d (ETA late-July)

Camera being assembled (ETA late-July)

Detector Assembly being fab’d        (ETA mid-July)

Collimator coated, being integrated (ETA August)

Slithead design being reviewed (ETA August)

Fold 1 coated and delivered

Cryostat being cold vacuum tested (ETA mid-July)

Fold 2 being coated (ETA mid-July)

Fiber assemblies (first articles) being fabricated (ETA July)

Spectrograph Fabrication Status