From ahazeghi at stanford.edu Wed Sep 3 15:57:10 2008 From: ahazeghi at stanford.edu (Arash Hazeghi) Date: Wed, 3 Sep 2008 15:57:10 -0700 Subject: Cryostation back online and new policies--please read carefully Message-ID: <012901c90e18$6596b7b0$30c42710$@edu> Hi, I'm pleased to report that after a long down time, cryostation is back online for business. There were several major issues in the system that have now been resolved. 1. Loss of electrical connection in the two lower arms, the miniature triax cables that connect the feedthroughs to the probe heads had been twisted badly, as a result of users trying to change probe tips without my knowledge. Once again, I emphasize that users are NOT allowed to change or modify probe tips in the system. If you find tips bent or broken you have to contact me. 2. Back diffusion of oil to the chamber and degraded vacuum, this was due to the anti-suck-back device failure which had let to oil being sucked to the turbo. Normally pressure difference is such that with the correct operation of suck back cup, there should be no diffusion of oil into the chamber in measurable quantities except for the brief venting period. So, please keep an eye on your sample, if you see any trace of oil in the chamber please shutdown and vent the system immediately after warming up to room temperature. Redlight the tool on coral and notify me. 3. Ion gauge failure and incorrect reading, this was again due to the oil diffusion problem, ion gauge is now replaced and calibrated, notice the IG sense light is now ON. 4. Pneumatic isolation system was out of tune, this is due to users leaning on the table or placing heavy objects on the table. The cryistation base table is NOT a working surface and you should never lean against it. Please be careful. 5. All probe tips were bent. I replaced all tips and they are now in good shape. Looking at my account, our group has paid about $1000 worth of tips in the past 6 months. We can no longer provide users with tips therefore I am requiring all users to buy and hold 4 X 25um BeCu tips from Lakeshore (www.lakeshore.com) so that I can replace them when broken. Failure to provide tips will suspend your privileges. Also please log the condition of the tips in the provided sheet. If you forget to log the tip condition you will be responsible for providing tips, even if you did not break them. Finally, as you have figured how difficult it is to fix and maintain this tool, please be most considerate when operating it. Never leave the tool unattended for extended periods, fully disengage the tips and retract them if you have to leave and never leave the transfer line attached to the system when there is no liquid transfer. Thank you for your cooperation and helping to keep the tool operational and useful for everybody's research. Arash ---------------------------------------------------------------------------- ------ Arash Hazeghi PhD Candidate Stanford Center for Integrated Systems CIS-X 300, 420 Via Palou Mall, Stanford, CA 94305 phone: +1-650-725-0418 web: http://www.stanford.edu/~ahazeghi -------------- next part -------------- An HTML attachment was scrubbed... URL: From ahazeghi at stanford.edu Mon Sep 8 10:01:00 2008 From: ahazeghi at stanford.edu (Arash Hazeghi) Date: Mon, 8 Sep 2008 10:01:00 -0700 Subject: FW: Power outage in CIS 152 .... Message-ID: <000101c911d4$78003bf0$6800b3d0$@edu> Power will be gone in the next two days. I am shutting down the system to avoid damage Thanks, Arash -----Original Message----- From: John Shott [mailto:shott at stanford.edu] Sent: Monday, September 08, 2008 9:51 AM To: bruce; Simon Wong; Arash Hazeghi Subject: Power outage in CIS 152 .... Bruce, Simon, and Arash: FacOps is planning on shutting down one of the main electrical panels for a period of about 3 hours in the next day or two. This panel will likely affect power in CIS 152. Here's the background: On Friday afternoon, several of the breakers on another panel lost power and it appears as if the breaker in the upstream distribution panel failed. As a result, that distribution breaker needs to be shutdown in order to replace the faulty breaker. This shutdown will affect about 1/3 of the pieces of equipment in the lab but will also affect both of the panels in CIS 152. While I suspect that a number of instruments will not be adversely affected, anything that is under vacuum, for example, should likely be gracefully shutdown before this outage. The schedule of when this will happen is uncertain at the moment pending locating a replacement breaker but it is likely to happen either this afternoon or tomorrow. Let me know if you have any questions, John