To: J. Cook, D. Helms, W. Skinner
cc: Division (M7), FEL Coordination Group
From: F. Dylla
Subject: IR Demo Project Weekly Report, January 4-8, 1999
Date: January 8, 1999
Management
The IR Demo has been shut down for maintenance/installation
activities since before the Holidays. This maintenance period
is coincident with a shut-down period for the main machine. We
expect to bring the machine back on-line during the week of Jan.
25th.
Preparations continued this week for presentations
that will be made before the DOE (BESAC) Panel on Novel and Coherent
Light Sources on Jan. 19-21, in Gaithersburg, MD. In addition
to a description of the JLab FEL program, science applications
of the FEL will be discussed by Prof. Bill Cooke (CWM) on atomic
physics, Prof. Kevin Lehmann (Princeton) on chemical physics,
and Prof. Len Feldman (Vanderbilt) on materials science.
Discussions continued with representatives
of Northrop Grumman and Advanced Energy Systems, Inc. on a collaborative
effort for upgrade of the IR Demo to higher power levels.
Installation/Maintenance Activities
Good progress is being made with gun maintenance
activities. A new cesiator was prepared and is being baked this
week. A new photocathode and new residual gas analyzer will be
installed in the gun next week according to schedule.
Several new diagnostic systems are on track
for installation this shut-down. Beam current monitors have been
installed in the 4F and 5F regions. The multislit diagnostic for
the injector (1F) region has been re-machined with a smaller slit
and is ready for re-installation.
A major activity for this shut-down involves
placement of RF screens over the IR sensors in the RF couplers
in the cryomodule. Both the IR and phototube detectors that are
installed on RF power couplers protect the warm/cold RF windows
from excessive heated and/or arcing. These sensors have been
affected by HOM power as we pushed the recirculation current above
1 mA. If the screens do not solve the problem, gatevalves will
be added to the IR sensor ports on three cavities during this
shut-down to allow other solutions to be investigated. The FEL
cryomodule will be warmed-up this weekend, the modifications performed
next week, followed by cool-down next weekend.
Commissioning Activities
A draft Laser Operations Safety document
for User Lab 1 has been completed and reviewed by the lab's laser
safety officer.