Second Quarter 1995

A first cryostat layout was completed. However, further work on the optical design resulted in an increase to the beam size in the spectrograph to avoid having large prism angles (and therefore larger reflection losses). This resulted in longer focal length optics. These have proved more difficult to fold efficiently. The net result is a larger vacuum jacket. A preliminary design of the calibration unit was also produced. Design modifications were made to the IRTF Test Dewar to enable it to be used for testing arrays, electronics and mechanisms for potential use in SpeX.