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User name R. Michaels
Log entry time 11:08:10 on March 2,2012
Entry number 362707
This entry is a followup to: 362704
keyword=cycled Q2,Q3. magnet status
Bob M. and Igor K.
At 10:15 we set P0 = 2.254 GeV/c
We cycled quads Q2 and Q3 per instructions in halog 362704.
Q2,Q3 to 1400 A, except for R-Q3 which goes to 1100 A.
Note: we found that if we put in the currents in the blue dialog
box, the Quad would go there but only stay for a brief moment (1 sec).
In order to make the Quad stay at the max current, we had to
turn off the regulator. Click on the GeV/c button and click
"off" for P0 regulation. Then click "on" after a few minutes
at max current.
We checked the polarity of the gaussmeter readings. They look
correct for negative (electron) polarity. It is a pattern of
positive and negative values which are well known. However, we
also found that the "polarity" button on Left HRS Q3 power supply
This looks wrong, but we suppose (from the gaussmeter) that the
polarity is actually Negative. See fig 1.
Note, the gaussmeter readings are the fundamental thing to go by.
The rest (N or "polarity" in a GUI) are just software, can be wrong.
Present status (fig 2) : all magnets set, except R-dipole, but that's
known to take hours to settle.