MEMORANDUM
To: J. Albertine, D. Helms, W. Skinner
cc: Division (M7), FEL Coordination Group
From: F. Dylla
Subject: IRFEL Weekly Report Sept. 9-13, 1996
Date: September 13, 1996
Management
- A Workshop for the Laser Processing Consortium was held on
Sept. 9-10th with approximately 64 attendees from most of the
institutions presently in the Consortium and observers from several
organizations interested in LPC activities. The metal processing
working group and micromachining working group were well represented
at the workshop. Technical issues related to User Lab operations,
equipment lay-out, safety and equipment interface were discussed.
Action items for all the working groups and Jefferson Lab were
identified. A summary of the workshop and working group sessions
is in preparation.
- On Sept. 10th a planning meeting was held to finalize the format
and invitation list for the Megawatt FEL Workshop to be held on
Sept. 24-25 at Jefferson Lab. A preliminary agenda and background
information on the workshop goals were distributed to potential
attendees on Sept. 12 by the workshop organizer, Alan Todd of
Northrop Grumman.
Injector Test Stand
After mounting a new photocathode wafer, we baked the gun and
beamline in preparation for a new series of runs. The cathode,
upon activation, emitted 120 microamps when subjected to white
light, with a 3.5-to-1 white-to-red ratio. This is a factor of
40 better than the white light response of the previous photocathode,
and its quantum efficiency is therefore projected to be significantly
better. Plans are to run with beam this afternoon (Friday, 13
Sept. 96).
Accelerator Systems
- The number of power supplies to power the transport-lattice
dipole magnets has been increased from one to two to aid in achieving
first light without having to do energy recovery. One power supply
will drive the chicane dipoles, and the other will drive the recirculation
dipoles. Both power supplies exist from the inventory of the
nuclear-physics machine.
- The transport lattices leading to the low-energy (10 MeV) dumps
were frozen.
FEL Systems
Wiggler
A review of contractual progress on the wiggler is being held
at STI Optronics in Bellvue, WA today (Friday, 13 Sept. 96).
Optics
A review of the optical cavity design is scheduled for Sept. 26.
The drawing package for the optical mounts and the modelling
of mirror thermal distortion will be reviewed.
Operations/Commissioning
The procedure for changing photocathodes in the Injector Test
Stand was put on WWW.
Facility
- The aftermath of Hurricane Fran and continuing wet weather
delayed any pouring of concrete for the FEL building this week.
Site work continued according to plan on laying of forms and re-bar.
If good weather returns, the pouring of the final third of the
floor will occur next week.