Subject: Raith 150 stays in red state until Wednesday afternoon
From: "Bernd Stegemann" <>
Date: Mon, 25 Apr 2005 20:05:40 +0200 (MEST)

Since the problem with the leakage current is unusual for this column and
not quite understood, several steps have been taken to troubleshoot the

The following parts have been exchanged separately, with testing after each

- Linertube with 6 hole aperture
- Blanker mechanics
- Anode including anode aperture
- extractor contact pin

Unfortunately every time the column is opened, a long bakeout is needed to
gain the necessary vacuum.

The last work on the column was done onm Sunday night; which is the reason
for the delay. For testing reasons the gun has been run up today. The drop
in vacuum that occured during the runup indicates that another bakeout cycle
is required.


Bernd Stegemann
Raith GmbH

I am sorry for the inconvenience and delay.

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