E94-010 Beam delivery procedure to hall A
E94-010 Beam delivery procedure to hall A

by Arun Saha
Last updated on 11/12/98

This note is to remind users the steps to follow everytime beam 
is delivered into  Hall A after a  major shutdown or after a major 
retune. The attached memo to the MCC operational crew is to remind 
THEM of the procedure THEY must follow in delivering beam to the hall. 
It is the responsibility of the Hall A experimental crew that the 
quality of the beam being delivered is acceptable. If necessary,
 do a harp scan of Harp #6 (right after the last BPM) after good cw 
beam has been established to the hall, both with and without the 
raster on.

This note is to make sure that beam delivery to Hall A is done according 
to the prescribed operational procedure. Everytime beam is delivered 
into the hall after a major shutdown or after a retune, it is very 
important that these checks in the operational procedure be performed. 
This is to  prevent immediate and catastrophic damage to sensitive 
equipment along the beamline and the target systems in the hall. 

1. With pulsed beam, make sure the relative orbit in Hall A is zero. 
Are BPM relative positions zero and well calbrated (esprecially the last 
two BPMs (IPM1H03A and IPM1H03B) just before the Hall A target. There should 
be no doubt that the beam positions read out from the last two BPMs are 

2. Make sure the 5 ION Chambers along the Hall A line are working and 
the readback on the medm screens are playing back the correct values 
(i.e. they are not frozen). This is essential, as the experimenters have no 
other way of knowing whether the radiation levels in the hall are being 
recorded properly or not. If the ion chamber readbacks are not functioning, 
software on call needs to be informed immediately to get it fixed. NONE of 
the 5 ion chambers should ever be masked during beam delivery to the hall 
except with my permission. (or Kees DeJager) 

3. Make an aperture scan of the beam through the Hall A fast raster
ceramic pipe. Center beam in aperature using ion chambers as feedback. 
E-log the beam aperture.

4. BScope data should be taken, studied  and recorded before 
acceptable beam is delivered to the hall. It also needs to be recorded 
before every shift and whenever the experimenter need it.

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