11/25/03 Beam Studies
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Day (8:00 - 16:00)
A few issues addressed and work done during the day:
1. Dave Mack looked at BCM1 and 2 which were not working last night. The downconvertors were apparently disconnected. It has now been connected, and we should be getting signals now.
2. J.Musson and T.Allison took an access into HallC to update the firmware on the YO box. They will test this once we get G0 beam back into the Hall.
3. Some of the racks in the Injector Service Building lost power. The racks held the G0 injector DAQ as well as the IOC that talks to it. There is speculation that this may have been caused by workers installing insulation at the new ductwork. ACC is recovering from this outage.
4. HallC Harp Scans were done by the ACC. The two harps on the g0girder (G0 and G0A) seems to show nothing. The beam intensity may have been too low (they were using 5uA tune mode).
Swing (16:00 - 24:00)
- PD called at 18:30. No beam for 6 hours to a shift. ACC is having trouble in the injector as well as working on completing their own testplans. .
- At this point, the decision was made to skip the coil pulsing, Energy modulation, and Halo monitor checkouts and go right to parity studies when we get beam during Owl.
- 22:30 - Dave Mack comes in to give the UNSER more dynamic range.
Owl (00:00 - 08:00)
- Brian checked the YO box at different beam currents. It became unlocked at 4uA. It looks like the box is working.
- 03:00 - BCM calibration was done. BCM1, BCM2, and the UNSER were calibrated against the MPS BCM (from ACC). Damon updated the database to have the new pedestals and slopes.
- Transmission to the Hall is not very good (30-40% transmission).
- RHWP scan done. In the middle of the RHWP scan, asked MCC to improve transmission. Now at 66% transmission. There are analysis issues with the RHWP scan. The offline_hists and qrtntuple show zero, and 1E7(?) respectively for the charge asymmetry at the target. The beamntuple does show BCM1 and BCM2 currents, so I suspect a software problem. (example...see run 17472). We minimized the charge asymmetry at the first injector BPM for the time being, and move onto an IA scan
- IA scan was taken. Again, g0analysis doesn't seem to want to calculate the charge asymmetry in the ntuples/histograms, so we defer analysis of this to after the problem is fixed.
- PZT scan was taken. Below shows the location of orthogonality breakdown, and various settings:
PZT Scan Breakdown location Settings Changes/effects
1. BPM0I02A Nominal
2. BPM0I02A MQS0I07 = 20gauss no improvement in injector
Increased transmission
3. BPM0I05 MQS0I07 = 10gauss no real improvement in injector
4. BPM0I02A MQS0L01 = 7gauss no improvement in injector
This was somewhat disappointing. One thing that must be noted is that the orthogonality breakdown was not so sudden in the injector a few nights ago. The gradual breakdown was compensated for by tinkering with the 0I07 skew quad. Tonigh, there is definitely something happening between 1i06 and 0i02A.
I observed the adiabatic damping with the first PZT scan. The numbers can be found:
adiabatic damping table