MEMORANDUM
To: J. Albertine, D. Helms, W. Skinner
cc: Division (M7), FEL Coordination Group
From: F. Dylla
Subject: IR FEL Weekly Report: August 12-16, 1996
Date: August 16, 1996
Management
Financial reports were issued and reviewed for the project expenditures
during the month of July.
With the startup of operations of the injector test stand, physics
and engineering support coordinators were appointed to orchestrate
daily operations of the ITS.
Planning continued for the September LPC Workshop on Sept. 9-10.
Injector Test Stand
The ITS is a center of vigorous, well organized activity. A photocathode
was fabricated and cesiated, and 3 microamps was extracted from
it with white light. It was then processed to 300 keV and is
now "routinely" subjected to 250 keV. The gate valve
was opened to the beamline leading from the gun, and stable, compatible
vacuum was established. The beamline instrumentation and magnetics
are undergoing checkout. On Friday afternoon (16 August) at 4:40
p.m., we generated a 250 keV beam brightly visible on the first
beam line viewscreen using only a nanowatt of HeNe incident laser
power.
Completion of fabrication of the cryounit is now slated for mid-September.
Because the cryounit is not on the critical path, some time is
being devoted to taking extra care in its assembly.
Accelerator Systems
Theoretical modeling of the multislit apparatus for transverse-emittance
measurements of the "10 MeV" space-charge-dominated
beam are nearing completion. This activity will result in a data-reduction
algorithm.
Calculation of impedances of FEL beamline components is a continually
ongoing activity. For example, one product this week was an impedance
analysis of shielded vs. unshielded valves for use in the beamline
leading out of the photocathode gun.
About 70% of the design of the cryomodule is complete and several
of the related procurements are started. For example, the bridging
cylinders that link the component cryounits are in procurement.
FEL Systems
Wiggler
Initial discussions were held with the engineer in charge of design/fabrication
of the wiggler support/girder. The design goals were covered
and the specifications were discussed. We received magnet modeling
software from SIM Limited and started to benchmark it.
Optics
The Pyrocam for beam quality measurements was ordered. Thermal
modeling of mirror distortion due to coating absorption is continuing
after problems with the computer at LBL were fixed.
Operations/Commissioning
The weekly FEL commissioning activities are currently focused
on devising commissioning plans for sections of the machine.
To do so also provides another check of the completeness of the
beamline components that are planned for the machine. This week,
a draft commissioning procedure for the first recirculation arc
was developed.
Facility
The second third of the floor slab, including the UVFEL wiggler
pit, has been poured and the forms for the exit stairway are almost
complete. Much progress has been made on the wall forms at the
west end of the building.