From cearhart at stanford.edu Thu May 1 17:46:54 2008 From: cearhart at stanford.edu (Chris Earhart) Date: Thu, 1 May 2008 17:46:54 -0700 Subject: AMT etcher free tonight Message-ID: <131c1bff0805011746w423338a7h2833b632a304bb9e@mail.gmail.com> I don't have access to Coral at the moment, but please feel free to use my reservation (Coral login - cearhart). Thanks, Chris From jrjain at stanford.edu Thu May 1 17:51:07 2008 From: jrjain at stanford.edu (Jinendra Raja Jain) Date: Thu, 1 May 2008 17:51:07 -0700 Subject: amtetcher free now-10pm Message-ID: <005501c8abee$9bf574e0$d3e05ea0$@edu> Finished early -------------- next part -------------- An HTML attachment was scrubbed... URL: From eenriquez at snf.stanford.edu Thu May 8 09:46:10 2008 From: eenriquez at snf.stanford.edu (Elmer Enriquez) Date: Thu, 08 May 2008 09:46:10 -0700 Subject: System OK to run around midnight ??? Message-ID: <48232E52.2090806@snf.stanford.edu> We believe that we have resolved the chamber pumpdown problem around midnight. We have noticed a significantly faster pumpdown during the day since we cleaned the heavy polymer build-up off the baseplate and the hexode pedestal. Prior to the clean, it took about 5.5 minutesfor the process to start after the RUN button is pressed. After the clean, It took about 2.5 min. Now we need users to report on the systems performance around midnight. Elmer From caner at stanford.edu Sat May 17 01:25:44 2008 From: caner at stanford.edu (Caner Onal) Date: Sat, 17 May 2008 01:25:44 -0700 Subject: amt 8:30 am - 11am reservation cancelled Message-ID: <7519AC57-B464-4889-AD77-A775417796BC@stanford.edu> From jrjain at stanford.edu Sat May 17 10:40:08 2008 From: jrjain at stanford.edu (Jinendra Raja Jain) Date: Sat, 17 May 2008 10:40:08 -0700 Subject: amtetcher free at 11am Message-ID: <000601c8b845$0f277f00$2d767d00$@edu> Samples not ready. Apologies for late notice. -------------- next part -------------- An HTML attachment was scrubbed... URL: From shott at stanford.edu Sat May 17 14:23:02 2008 From: shott at stanford.edu (John Shott) Date: Sat, 17 May 2008 14:23:02 -0700 Subject: Reserved for leakchecking and temperature-related troubleshooting .... Message-ID: <482F4CB6.70107@stanford.edu> amtetcher community: We have reserved the amtetcher starting at 3 p.m. until midnight on Monday, May 19. We hope to do a couple of things during that time window: 1. During the afternoon, we hope to do a thorough helium leak check of the system and figure out where any significant vacuum leaks occur when the aisle is comparatively warm. 2. We will also try to monitor the temperature of the base plate, the hex, and the bell jar at this time. 3. We plan to get facilities to "dial back" the air flow into the cleanroom at a somewhat earlier time that usual (this is usually dialed back at 11 p.m. through 6 a.m. the next morning). We will hope to dial back the fans at something like 7 p.m. 4. We will then repeat leak checking and temperature measurements when the fans are dialed back and, presumably, the air temperature in the aisle is lower. In particular, we are looking for any leaks that may be significantly larger when the system/room is cooler than what we observe when the system/room is warmer. We are hopeful that this approach will help us to pinpoint the cause of the "failure to pump after 11:30 p.m." problems that have plagued this machine for some time. If you have any questions or comments, please let us know. John From shott at stanford.edu Thu May 29 16:07:30 2008 From: shott at stanford.edu (John Shott) Date: Thu, 29 May 2008 16:07:30 -0700 Subject: Weekend work on system .... Message-ID: <483F3732.2010009@stanford.edu> AMTetcher fans: You may have noticed that Cesar has reserved the amtetcher this weekend. We are planning on doing some significant work that, we believe, may address some of the late night pumpdown issues. In particular, we plan to: 1. Replace the O-rings that seal the hexode rotation assembly. We've seen intermittently high rate of rise that would be consistent with a marginal seal on this rotating surface. 2. Replace the liner of the bell jar and clean the inner surfaces of the bell jar. This represents a lot of surface area that can capture moisture when the bell jar is open. 3. Clean other internal surfaces while things are stripped out of the system. This represents a significant tear down effort and one that has not been tackled in some time. We feel, however, that this will result in better vacuum performance. While I won't yet guarantee that this will resolve the post-midnight pumping problems, I'm hopeful that we'll see more consistent pumpdown performance after this rebuild. We'll keep you posted. Thank you for your continued support, John