Special HERA coordination meeting on Shutdown Scheduling
Mon, 12.2.2001, 11-12:30

B. Foster (ZEUS), E. Elsen (H1), E. Steffen (Hermes), M. Medinnis (HERA-B),
F. Willeke (HERA), R. Klanner (F)

ZEUS:
MVD construction is slightly ahead of schedule compared to Jan 2001, which
was delayed by 3 weeks compared to Aug 2000.  A part of the Forward tracker
still has to be transported from Moscow to DESY, after the custom problems
have been solved. It will not cause schedule problems if it arrives before
the last week of Feb. 01. While ZEUS could still make the schedule discussed
at the last HERA co-ordination meeting, i.e. a 3-week delay, such
a schedule has zero contingency and therefore is still likely to
be subject to slippage. In order to increase confidence in the revised
shutdown schedule, an extra week of MVD testing plus contingency in the
installation of the new GO and GG SC magnets is advisable.
ZEUS would then be closed on Mon, 9.7.01.
The installation of the electronics for the lumi detector SR will require a
few keyed accesses after the tunnel is closed on 2.5.01.

H1:
The production of the front-end electronics and optical readout link for the
new inner trigger MWPC is delayed by two bad lots of laser diodes, and by use
of a fast-drying one-component conductive glue, which became resistive after
a short while. A slower two-component glue is fine. The chamber is ready, the
last system test is underway, and the electronics can be added a few weeks
later in the instalation sequence.
The GO/GG subcooler has production problems at Air Liquide, Grenoble and is
now announced for early March 01. It is needed for the GO cold test starting
on 9.4.01.
The new backward proportional chamber from Dubna is ready and also delayed
in Russian customs.
The radiation hard chips for the central silicon detector have been produced
at ATMEL, Nantes, are not yet tested and are waiting for the French export
license.
The CIP delay instroduces a shift of 5 weeks compared to the Aug 2001 schedule
and H1 will be closed by Fri 6.7.2001.

Hermes:
Due to DAQ problems a few tests of re-installed detectors are delayed, but
there is no shift compared to the Aug 2000 schedule.
The new magnet for transverse target polarization is in production.
The design for the high-flux pole shoes has been debugged and agrees between
MAFIA and TOSCA at the 10^-3 level.
The east tram will be removed by 31.3.01, which leaves time for Hermes
installation as on the original schedule.

HERA-B:
Maintenance work is progressing.
10 weeks are needed for work on the chambers on the -x side (ring outside),
which are now squeezed to the wall of the hall for the tram bridge.
The tram west will be removed on 9.4.01, which leaves enough 'tram-free' time.
To finish the re-installation one scheduled maintenance day during the
HERA startup phase and two consecutive access days before regular lumi
operation are needed. Parts of the silicon vertex detector will be exchanged
in the christmas 01/02 shutdown, which takes 2 weeks plus 1 week for pumping
of the p-beam vacuum in the west straight section.
HERA will run until 22.12.01, HERA-B will have the Christmas break and the
first week of January, and HERA will start up in 2002 with e-beam polarization
studies while pumping in the west.

HERA:
the upgrade installations in the tunnel are progressing on schedule.
The quadrants N, W, and E will be closed on 2.5.01 and S on 14.5.01.
The commissioning of magnet power supplies will take until 9.7.01.
After testing of the new magnet bridges and GO/GG in N and S the HERA
beam operation will restart on 18.7.01.
The lumi run with polarization for Hermes is now reduced to 18 days in Dec 01.
Longitudinal polarization for H1 and ZEUS will be established in the beginning
of 2002.
An updated HERA Run schedule for 2001 will be placed on Mrs. Grabe-Celik
Zeitplan web pages.

The next regular HERA coordination meeting is scheduled for
Mon 14.5.2001, 11:00, Sem 5.

Daniel Pitzl
13.2.2001