Janis Cryostat
Beamline Setup: The Janis is installed on the sample compartment. Samples are under low vacuum at ambient to LN2 temperatures (~-190C). The Janis cryostat is under medium-low vacuum, pressurised with Nitrogen when needed.
General Hazards and their mitigation:
When sample change over occurs, please keep the cryostat as dry as possible
PLEASE BE AWARE OF | |
1. | Do not handle cold sample stick, use heat gun to warm the stick on a low setting. |
2. | Do not put a wet sample stick into the cryostat. Please use the heat gun on a low setting to dry it. |
3. | Do not use force on the sample stick as you risk breaking it and all its wiring |
Samples:
Sample prep can be done onsite – be sure to request time for this during the time before your beamtime, otherwise you will be preparing all of your samples during your beamtime. Samples are solid, or powders pressed into 13mm discs. Disc sizes of 1, 3 and 7 mm can be pressed using our hand press. Collars are used to make the samples a standard 13mm. Samples may be pressed using PE powder, or wax. It is recommended to warm the wax or PE to get the best transmission through your samples – wax can be hand warmed, PE needs to be heated to ~100C. Amounts will vary based on your samples – there is no recipe to suit all samples. It will be based on how much your sample absorbs and how it physically binds together. Finding your recipe could take some time.
We use standard PIKE IR pellet presses. We recommend the Pike handpress.
It is recommended to talk to your beamline scientist about the best approach for your samples.
Users must continue to fill in the sample hazard matrices in the EA form.
Beamline: THz
Setup: Janis Cryostat
This document is intended to aid experimental setup and completion of the EA form. Users will follow any setup and guidelines contained within this document.
Spills:
As samples are pressed into a solid disc form, spills are not possible.
Disposal: Samples should be returned to your facility and disposed of there. Discuss anything else with the beamline scientist.
Safe shutdown procedure: “in the event of an evacuation of the facility / incident, what steps should be taken to make the equipment safe” ?
Turn off the cryostat controller.
Turn off the temperature controller. This ensures no heaters are accidentally left on.
Close the beamline gate valves.