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All users must meet with Phil Jeffrey (Schultz-417, 258-3978, pjeffrey@princeton.edu) before they can use the equipment. You must also have taken X-ray radiation training by EHS (see http://web.princeton.edu/sites/ehs/) and have a radiation badge and be wearing it
To obtain beam time:
Email Phil Jeffrey (pjeffrey@princeton.edu). All requests must be sent via email for record keeping, even if you simply want to screen crystals for a few hours one evening. Specify preferred detector, start and finish dates, and purpose of experiment (e.g. data collection, screening for cryo, prep for synchrotron trip etc.)
To start X-ray equipment:
Cold Stream:- Check lN2 level in big dewar. If below 1/4, fill the small dewar take large dewar down for refill
- Check lN2 level in small dewar. Do not operate if the level is below 6.
- Turn on dry air unit
- Turn on cryo control system and program RAMP to 100K at 120K/hour, then HOLD at 100K, then END to 290K.
Helium:
- Turn on Helium. If Helium level is below 750 psi, notify Facility Manager
- Flush mirror box as per directions on system. Helium is essential to protect the mirrors. Do not operate without it.
- Run Helium at slow purge for duration of data collection.
Power Up Beam:
- To 50 kV and 100 mA, slowly
At End of Run:
- Program cold stream to ramp to 293K at 120K/hour
- Turn off Helium at tank
- Power down generator to 20 kV and 10 mA, slowly
- When the cold stream reaches 293K, turn off the dry air system and the cryo control box
- Clean up the hutch and computer room (no loops, plates, tips to be left here)
- Fill out end of run form (currently optional)
- Move useful data from PC to process disks and delete unwanted images (data left > 1 month can be deleted)