09 January 2008

RHIC Startup:  APEX is underway.  Problems with the C7 Booster bump delayed beam until ~9:00AM.

We have not been able to repeat the good luminosity fill of yesterday morning.  At least one of the three intervening fills had an instability in Yellow. 

Mike Brennan needs to work on the Landau cavity in Yellow.  He also wants to adjust the voltage on the stochastic cooling to address the problem of satellite bunches.  Carl Schultheiss needs time to work on the transfer function of the dipole.  Mike Brennan needs to make an access to the 12 o'clock hall to check on the alignment of the stochastic cooling plates.  This will take 5 minutes.  If the plates are out of alignemnt, then another half hour access will be required to bring them into alignment. 

PHENIX has been running since yesterday with a brass sheet around their beampipe to calibrate the photon conversion rate.  They need to take that sheet out now, requiring the East Carriage to be pulled back.  This necessitates a half hour access at the end of APEX, or at any time there is a failure during APEX.  Once they get back on, and get a store going, they will take a 1 hour long magnet-OFF run to measure the location of the East Carriage since it will have been moved.  This will be accomplished during the last hour of a store, perhaps the first store after APEX.  It should not impact either STAR or RHIC.

STAR will take the opportunity to make an access during the PHENIX access.