[BLAST_SHIFTS] Target Field Data

From: Mr. Shannon Krause (skrause@rocko.mit.edu)
Date: Thu Feb 19 2004 - 18:02:25 EST

Last night Operations performed some rigorous tests on the effect of various
magnets on the target holding field. All of these magnet systems steer the
electron beam. Below is a summary of these results.

_____________________________________________________________________________________________
                                   
STATE DEVICE MEASUREMENT NOTES
       BLAST HOLDING BLAST BRP TRANS LONG
       MAGNET FIELD TRIMS MAGNET FIELD FIELD
_____________________________________________________________________________________________
           
ON 10.1 -3.7 Residual
magnetization in iron
OFF X X X X or field probe
calibration offsets
_____________________________________________________________________________________________
   
ON X 6.9 -3.4 small effect
OFF X X X
_____________________________________________________________________________________________

ON X 216.8 250.8 Should be
250.0 trans
OFF X X X
_____________________________________________________________________________________________

ON X 10.2 -3.6 No change due
to BRP
OFF X X X when BLAST
field is OFF
_____________________________________________________________________________________________

ON X 28.4 -4.9 18.3 gauss to
trans
OFF X X X from BLAST
magnet
_____________________________________________________________________________________________

ON X X 29.5 -4.9 1.3 gauss
change in trans
OFF X X when BLAST is
ON
_____________________________________________________________________________________________

ON X X X 28.2 -4.8
OFF X
_______________________________________________________________________________________________

ON X X X X 234.4 249.2 Normal BLAST
Field
OFF Data from
2/18/4
_______________________________________________________________________________________________

ON X X X X 201.6 253.1 Reverse BLAST
Field
OFF Data from
2/12/4
_______________________________________________________________________________________________
                                   
                                   
Data from 2/18/2004
BLAST at normal polarity = 6730 Amps
Transverse Holding Field = 500 Amps
Longitudinal Holding Field = 250 Amps
BRP setting = 170 Amps

Data was taken starting from the bottom of the table to the top
Holding Fields were cycled at each step 

-- 
Shannon Krause
Accelerator Operations Group Leader
MIT Bates Linear Accelerator Center
21 Manning Rd. - P.O. Box 846
Middleton, MA 01949, USA

617-253-9206
krause@mit.edu

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