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User name Chiranjib
Log entry time 22:28:30 on November 16, 2008
Entry number 249275
keyword=CORRECTION COIL TURNED OFF
We turned OFF the correction coil to see the effect whether the
*equilibrium* polarization increases or not. This is because we have seen
some kinda "masing" effect ( NOT 100% SURE THOUGH) during the last few
hours. The polarization history tells us we are more or less stable at
58/59 % of polarization during the spin flip in beam. But this number was
definitely higher (~64%) before. And also you can notice it from the
polarization strip chart. Its happening only in one spin state.
The only difference in this case is once we came back from the
controlled/restricted access last time, we turned on the correction coil
( the small coil was @ 0.18 A and the large coil is @ 0A). Once we
noticed that drop in the polarization , we waited for hours to see if
that would increase. But it stayed the same around ~59% . So we decided
to turn the correction coil OFF at this moment and lets see if that would
improve the polarization.
Its worth to mention here that the UVA cells have this masing effect
noticed while being tested. Any comments / suggestions on this will be
helpful.
A copy of this log entry has been emailed to: yqiang , jinhuang,jpchen