Minutes of HERA Meeting      8.04.2005

HERA

• The voltage measurements showed clear evidence for a broken BU coil SR67. The time structure is the same as for the proton background spikes. The other BU coils SR and SL show no problems.
• The BU coils SR67 will be exchanged next week. The access will start Monday at 07:00hrs. The present schedule is to finish the work on Saturday. The goal is to restart proton operation on Sunday, 17.04.05. A final leak search will probably be done on Monday, 18.04.05.
• The GO/GG magnet will be warmed up for regeneration of NEG pumps.

• A new luminosity record of 4.5 10**31 cm-2 s-1 was achieved this morning.

Experiments

• There was no agreement for the HERMES proposal to do electron only operation until Monday morning.
  For the two fills last night the efficiency was 40% ZEUS and 0% H1 due to proton background conditions. For the present fill the efficiency is about 60%.
• The plan is to skip the maintenance day in May. In case the HERMES ABS tube breaks, there will be a 4hrs access in order to exchange the tube.

Schedule

• Luminosity operation until Monday morning. Beams will be dumped around 6:30hrs. The access will start at 7:00hrs.
  In case the proton beam is lost during the night shift Sunday-Monday, HERA will continue with electron operation until the access.
• The plan is to skip the maintenance day in May.
• Changing the spin rotator positions will be done in early May.

                Uwe Schneekloth