Minutes of HERA Meeting
12.08.2003
HERA
F. Willeke reported that there were several unexpected technical
problems which
slowed down the commissioning and machine study program so that HERA is
now 5 days behind the schedule.
In particular there was a failure of a water pump installation in HERA
West with subsequent flooding of Hall West
and there was the failure of the HERAe injection Septum B with the
necessity for exchanging
the septum magnet and difficulties to seal the tank vacuum tight.
Besides this, there has been normal progress: Both beams have been
accelerated, the machine study program has been
pursued normally.
HERMES
HERMES reported that the radiation interlock is now connected to the
beam dump. The radiation dose during commissioning
was quite large. The beam dump would have been fired 5 times if it would
have been connected.
ZEUS
ZEUS reminded that Wednesday, August 20, the drift chamber will be
modified for 95% voltage operation. This
leaves a narrow window for the planned background studies with the old
configuration.
Plans
HERA will proceed with HERAe and HERAp machine study program (see
current schedule on the HERA home page).
The longitudinal positron broad-band damper system and the
superconducting RF system are not fully available
yet and may still require some set-up time and access to the tunnel.
There will be stable positron beam at 27.5GeV for the ZEUS (and H1)
luminosity group on Monday afternoon, August 18.
The ZEUS Synchrotron radiation tests are now planned for Tuesday, August
19.
The 12GeV beam conditioning operation will start on August 20.
F.Willeke