[Fwd: Problem raith SNF 2005-02-08 09:39:24: Reports of increased scattering or leakage when blanked]

James Conway jwc at snf.stanford.edu
Tue Feb 8 10:02:50 PST 2005


Revised value due to typo:

Parameters:
10 kV, 20 um aperture, beam I Raith blanker 'on' (Beam Off) = 
0.0023 nA. Beam I Raith 'off' (Beam ON) = ~ 0.087 nA.



-------- Original Message --------
Subject: 	Problem raith SNF 2005-02-08 09:39:24: Reports of increased 
scattering or leakage when blanked
Date: 	Tue, 8 Feb 2005 09:39:24 -0800
From: 	jwc at snf.stanford.edu
To: 	raith-pcs at snf.stanford.edu



Greetings:
Yesterday with Dirk Englund we observed an increase in the scattering from the Raith blanker on the RAITH 150 EBL system.
Parameters:
10 kV, 20 um aperture, beam I Raith blanker 'on' (Beam Off) = 
0.0023 nA. Beam I Raith 'off' (Beam ON) = ~ 0.087 nA.
Users are requested to measure their beam Currents both with and without the blanker 'on' and record the values observed in the RAITH users logbook.  Raith USA and I are working to promptly address this concern.
JWC 02082005 09:39

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