Comment sem4160 SNF 2009-04-29 14:49:11: Very bad vibration and SEC hiss

ahryciw at snf.stanford.edu ahryciw at snf.stanford.edu
Wed Apr 29 14:49:12 PDT 2009


There was more vibration than usual today, resulting in an essentially unusable image at high mag and slow scan speed (even with good focus, stigmation, and alignment).
Also, the SEC valve pneumatics hiss often when the valve is being closed.  After moving the stage in and out of the SEC a few times, opening and closing the valve each time, I finally got it to stop hissing with the valve closed and the stage in the exchange position.  This procedure had to be repeated upon removing the specimens (i.e. to get stage in SEC with valve closed and no hiss).




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