MEMORANDUM

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

cc: Division (M7), FEL Coordination Group

From: F. Dylla

Subject: IR FEL Weekly Report: August 5-9, 1996

Date: August 9, 1996

Management

A draft monthly report for July has been produced. A final report will be released next week after the financial data has been collected.

Preparations continue for the LPC Workshop to be held on Sept. 9-10 at Jefferson Lab.

SURA Management has begun the process of inviting candidates to serve on a Defense Applications Advisory Committee. The first meeting will be called in the period Oct.-Dec. 96 depending on member schedules.

Injector Test Stand

- We are holding to the updated schedule. Bake of the gun and beamline was successfully completed this week. High-voltage conditioning starts this afternoon (Friday, 9 August).

- Concerning the fabrication of a back-up high voltage stack assembly:

1. Coupons of alumina are undergoing ion-implantation at LBL to parameterize the process.

2. A source has been identified for brazing the Kovar ring.

3. Jefferson Lab's machine shop is starting fabrication of a new cathode-support tube that is slated to receive an anti-field-emission coating.

Accelerator Systems

- Mechanical design drawings for the shielded beam viewers and beam-position monitors were signed this week. A contract to the University of Georgia for a bunch-length monitor based on interferometric monitoring of optical transmission radiation was finalized and placed in procurement.

FEL Systems

Wiggler

Following calculations of the field quality by the vendor an approach was chosen for the end correction which meets the requirements for steering errors and retains the proposed number of effective wiggler periods within the proposed physical length. Formal notification to proceed with the purchase of magnet and pole pieces was given to the vendor.

Optics

The draft engineering detail drawings for the optical cavity were internally reviewed for tolerances and manufacturability. Several minor changes were adopted to improve ability to assemble and reproduce position.

Overall the drawings appeared good and after correction will be released for signoff review.

Operations/Commissioning

A strawman schedule for the commissioning and operation was established for internal review. In addition a proposed approach to commissioning incorporating the necessary Readiness Reviews for DOE was produced and posted to the Web (n.b.- due to file management problems a significant number of the pages which had been previously established got wiped away. These are in the process of being reconstructed from the daily archive but there may be some documents unavailable for a few days.)

Facility

Work continued per or ahead of schedule on the facility. Forms for the second floor pour have been erected. Rebar is being tied in to the east half of the lower floor. Wall forms are being assembled around the emergency exit stairwell. Digging on the east end continued to establish the base for the elevator area. Barring unforeseen problems a second concrete pour can proceed next week.