These pages are not part of the HELIOS SDT proposal. A proposal will appear here before the end of the holidays. The present text is is intended to provide information for the HELIOS SDT.

Persons with interest in crystal rotation devices should look at the drawings of the cryofurnace and the high temperature furnace. Click on the items for reference to drawings and photos.

Three items will be purchased:

1) displex refrigerator (typically 8 K - 350 K)

Two other units with wider temperature ranges are made by AS Scientific. I believe their high temperature furnace is the best available, and the cryofurnace is unique. The prices (British Pounds) and specifications are:

2) Cryofurnace (2 - 600 K, 70mm diameter access) 13,566 Pounds Sterling

This unit is much like the "orange cryostat" familiar to neutron scattering scientists, but the cryofurnace has a welded tail section without indium seals.
notes: sample diameter 5.0 cm, sample window customer specified up to 28 cm. neutron access 360 degrees in plane of spectrometer

3) High temperature furnace (~300 C to 1800 C), controller, power supply, interlocked vacuum system, spare parts 41,330 Pounds Sterling

notes: sample diameter 4.5 cm, 10 cm high neutron access of 360 degrees in spectrometer plane, plus/minus 20 degrees out of plane

I am still trying to learn the state of the LANSCE purchase of the ILL furnace. Funding was requested for FY'98 through the weapons program. There is no word that the funding was approved, although there is no word that it is denied either.

To these three units (cryofurnace, furnace, displex) we must add engineering costs for flanges and feedthroughs. I think this will be minimal, since I envision no containment other than the top flange. Perhaps we should allow $US 10,000 for this.

Temperature control for the displex and cryofurnace will require the purchase of one controller unit (no strong opinion - $2000?)

The central HELIOS data acquisition system must include some capability for recording temperature. Eventually we will want to have the software use temperature to control data acquisition (so we can set up automatic runs and get some sleep). I hope there will be user-specified analog and digital inputs somewhere in the vicinity of the sample region of the HELIOS instrument?