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.