Tuesday, September 05, 2006
TWIN windows became dirty again
After the labor day, we tried to continue the experiments. So I filled the new gases into the TWIN excimer amplifier this morning. The output energy of the front end was 34.7 mJ, Alex already used this beam to align the target and x-ray spectrometer. Unfortunately, the energy was dropped to 7.7 mJ suddenly in the afternoon, I found there were small dust grains on the long chamber windows, which was similar to the status two weeks ago (on Aug. 22th). I cleaned the same windows on May 10th (http://xysong.blogspot.com/2006/05/twin-dirty-windows.html). It is very strange that the windows became dirty frequently. I guess the filter was dirty or something wrong inside the long tube.