MEMORANDUM

To: J. Cook, D. Helms, W. Skinner

cc: Division (M7), FEL Coordination Group

From: F. Dylla

Subject: IR Demo Project Weekly Report, October 13-17, 1997

Date: October 17, 1997

Management

The laboratory's quarterly scheduling meeting was held on Oct. 17 for priority ranking of project tasks for the next 15 months. These meetings are used to arbitrate and allocate the laboratories resources for these tasks. The contractual objectives for the IR Demo Commissioning and Upgrade project remain first priority goals for the laboratory.

At the Oct. 27-29 workshop on "Scientific Applications of 4th Generation Light Sources," five members of the FEL user group will be presenting talks about IR FEL experiments.

A draft proposal is being prepared by a subset of the FEL users for designing and fabricating User Lab infrastructure that will support the proposals that are in-process. The proposal is being prepared for submission to the SURA New Projects Committee at the Nov. 5-6 meeting at the SURA Board of Trustees.

C. Bohn presented an invited talk entitled "Radiofrequency Superconductivity Applied to Free-Electron Lasers" on Oct. 10, 1997 at the RF Superconductivity Workshop in Abano Terme, Italy. He then gave a talk entitled "Overview of Jefferson Lab's FEL Program" at Rossendorf Laboratory, Dresden, Germany on Oct. 13, 1997. There, he discussed details and possibilities for collaboration on Rossendorf's superconducting RF gun and superconducting FEL projects. Geoff Krafft also gave an invited talk at a Diagnostics Conference entitled, "Diagnostics for Ultra-Short Bunches."

Installation Activities

Highlights for installation accomplishments this week include the following: removing the transmission line for the photocathode gun's high-voltage power supply and redoing several leaky weld joints (reassembly and testing are taking place today, Oct. 17, 1997); nearly completing installation of the 50 kW klystron systems for the cryounit, with final interlock checks in progress; installing and commencing tests of RF software on both the injector and the linac; installing the 3 DU dipole magnets for the injection line and its dump; and removing two optical chicane vacuum chambers for rework of the mechanical interfaces for the beam-position monitors.

Commissioning Activities

We are presently engaged in commissioning the injector. This week's progress includes: heat cleaning the GaAs wafer and making a new cathode; baking the beamline between the cryounit and the differential pumping station to reduce the vacuum base pressure; commissioning the water skid and controller for the buncher cavity; operating both klystrons under software control and generating RF into their waveguide shorts; and completing the software requirements document for controlling the photocathode gun.

Regarding commissioning the accelerator as a whole, this week's progress includes: completing the SAVE/RESTORE files for the magnets and RF systems of the accelerator; successful high- voltage testing of the first 225 kW variable power supply for the cryomodule klystrons with a small load; and completing the software requirements document for controls of the viewer/insertion device.