Make New Entry, Make Followup Entry
User name R. Michaels
Log entry time 05:33:48 on March27,2014
Entry number 387742
Followups:
- 387782 03/27/14 08:24 L. Myers BPM/raster follow-up
- 388440 03/31/14 13:56 L. Myers BPM cabling on LHRS
Beam 2 uA. Target out. BPM at nominal (0,0). Downstream quads remain on,
we don't plan to turn them off tonight.
Ask for 4x4 raster. Runs are with pulser trigger T8.
Runs 1263 / 20277 (this time really 20277; the last run of halog 387716 was 20276)
Next, ask for 6x6 raster
Runs 1264 / 20278
Now ask for 8x8 raster
Runs 1265 / 20279 .... Oops, the beam is off.
Runs 1266 / 20280
Some first results and problems noted:
fig 1. We do see (on both HRS, but only L-HRS shown) the spot size change with
raster setting.
fig 2. Some problems.
upper left panel: raster current looks ok on L-HRS but on R-HRS we see only pedestal
upper right: a "normal" beam position monitor. The bedposts are due to the well
known bandpass issue.
lower left: there is a hole in some Y distributions
lower right: but before you conclude its a raster problem, there is no hole in some
other Y distributions.
Plan to sratch my head over these data later. Will sleep now.
I recommended to the shift crew that they continue their solid target program
with 4 x 4 setpoint raster. Keep in mind, the calibration is still very rough.
FIGURE 1
FIGURE 2
