RHIC Startup: The Au beam has been dumped inside the AGS whenever we have been tuning. There is evidence from the loss monitors showing that the beam has been hitting the J-17 section, just where the vacuum leak occurred. The practice known as "early turn-off" has been to stop accelerating the beam during tuning, but the magnets continue to ramp, so the beam spirals into the inside of the pipe. The same practice is true when bad bunches are dumped internally during RHIC injection. Is the berm capped over J-17? It has soil-crete over top of it.
SteveT needs to try reducing the beta* from 1 (or 1.2) to 0.8 or even 0.7 today. DonB needs to try a the new ramp without any beam in the machine before repeating it with beam.
| Scheduling Physicist: Mike Sivertz | Last updated: |
| Email: sivertz@bnl.gov | |
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