Hi shannon,
something has also changed since -e.g. - run 4104 in december
also with reverse blast field. These are the hall probes
data from that time
Time from EpicsFri Dec 19 19:48:47 2003
EpicsName=ABS_Scat_X_gauss Value =259.992
EpicsName=ABS_Scat_Y_gauss Value =247.716 (transverse)
They do not compare with the values of 201.6 253.1 on 2/12
Something could have changed which is not a B field. cheers,
-- tancredi
Pls note elog's email is elog@blast02 (!)
________________________________________________________________________________
Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
On Thu, 19 Feb 2004, Mr. Shannon Krause wrote:
> 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
>
>
>
>
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