We are pleased to congratulate one of our FEL industrial partners, AES, Inc. of Princeton NJ, who was awarded two JTO grants this week for support of the joint AES/Jefferson Lab project on development of high current injectors for FELs.

We completed draft CRADAs and work statements for two industrial collaborations and forwarded the documents to DOE for review. One CRADA is in support of the AES 100 mA injector development project; the second CRADA supports the request by AMAC, International for testing of high power rf windows.

Preparations began for the May 1-3 semiannual review of the FEL Upgrade project by discussions on the preliminary agenda, potential presentation material, and likely tour sites for inspection of hardware.

Meetings were held this week on potential revisions to the lab's Environmental Assessment in order to accommodate proposed building modifications for addition of the Helios synchrotron and the planned 100 kW FEL Upgrade to the FEL Facility.

George Neil presented a colloqium at RPI on results from the recently completed FEL user run.

Worked with W&M to resolve arcing problems which occurred with the support tube implantation. Completed preliminary designs on the shielded bellows between the gun and the lightbox and the shielded bellows/BPM combination between the lightbox and the buncher.

Gun HVPS - Waiting for ceramic cylinder to make new Conditioning resistor. The Running resistor has already been received. The mechanical detailing of the parts for the combined mechanism will be underway next week.

Quarter HVPS - HV wiring continues on the HVPS for cavity 3. Progress was made this week on the communications between the 2 PLC's that control and readout the various HVPS parameters. Progress was also reported on 485 communications between IOC's and our type of PLC's. We intend to use a similar 485 link in our installation.

Quarter Klystrons - The Machine Shop was finally given the plumbing parts we had on hand for the klystron carts. The balance is on order. A decision was made to use the 2 & 2 1/2 inch ball valves on the new LCW piping. The welding will start again about April 22nd.

Zone 3 - Complete. Waiting for new cryomodule.

Zone 4 - Complete. Waiting for LCW to make final system test on equipment in position 8.

Efforts to organize and track the I&C groups hardware and documentation based on a hand-held bar-code scanner are coming to fruition. The system has now been functionally integrated into a database. It works as follows:

With the help from the operations staff we have a number of the printed circuit board "stuffing jobs" taken care of. The include the VME 4 channel timing module, and the beam viewer control boards. Many thanks!

The beamviewer locations have been assigned to channels / chassis and has been turned over to software for signal names and screen upgrades. The dust covers for the beamviewers have been designed and ordered, the drawing for the beam viewer test box has been turned over to E-cad.

The location for the ion chamber on the wiggler has been identified and D. Dotson has begun work on the communication upgrade to EPICS. (RS-232 to 485). The fourth LeCroy HV pod for the additional Beam Loss Monitors (BLM) has been procured. The Altera programming development for IOC Interfacing and BLM logic is proceeding. EECAD continues to work on documentation for open projects (MPS Input Module, Digital Timing Module, etc.) The main effort has been to get the prototype of the VME Interface stuffed, programmed and working and to continue developing the schematic for the BLM MPS card

At Magnet Enterprises International (MEI) in Oakland CA. They are in production mode on coils, devoting two winders to the task. The third coil was potted.

We finished calibration measurements of the dispersion section corrector this week. We now have a formula which allows us to set the corrector so that the field integral is zeroed to the 2-3 G-cm level over the working range of the magnet.

We also measured the field with and without the vacuum chamber in place. The field was enhanced by approximately 1 part in 1000. This is greater than one would expect assuming annealed stainless steel. The larger effect is probably due to the amount of work the material endured while being shaped into a rectangular cross section. The strength of the dispersion section and the wiggler will be corrected for the difference.

The purchase order for OCMMS fabricated components was signed and sent to Procurement. Tests of the integrated PZT actuator on the UHV stepper motors (to be used in the optical cavity and collimator) showed performance consistent with specifications. The same PZT actuators were integrated into the OCMMS test stand and operated as expected. Lacking amplifiers (which are still at the vendor), a feedback circuit and amplifier are being constructed. Due to Easter holidays in Europe, the power supply and amplifiers will be received the week of April 8. While most of our efforts are centered on the active stabilization of the cavity mirror orientation, we have continued work on defining the hardware and software required to do the feedback on the cavity mirror ROC.

Design efforts are centered around completing the optical cavity vacuum chambers. The limit switches were moved to provide easier alignment and servicing. The turning mirror cassettes continue to be refined. Thanks to S. Benson's modeling efforts, we have a good idea of the optical layout for the collimator, and can generate specifications for the design. He was also able to complete calculations to define the outcoupler figure, so we can go out for bid on those components. Modeling efforts by J. Gubeli on the 50kW optical beam dump are proceeding.

After evaluating the proposals for the ultrafast laser, an award was made to Spectra-Physics. This will be JLab's first sub 100 fs light source. In parallel with these efforts, the hardware needed (gratings, optomechanics, and single-mode fiber) to do the first stage of compression of "waste" drive laser light is here, and installation will begin today. As a reminder, this hardware will be used for diagnosing electron beam dynamics and their effect on the FEL. In parallel with this effort is one to design an insertable mirror to route the THz light to a point where it can interact with a synchronized ultrafast laser. Calculations show that relative insensitivity of the wavefront of the THz light to misalignment of this mirror.

On the UV cavity, modeling continues on the cryocooled mirrors. The optical penetrations between the vault and upstairs were checked and added to our system print, so we can best determine how to best integrate the UV optical transport wit the IR transport.

Other activities:

We forgot to mention that last week we gave a tour to Mr. W. Decker, Brashear LP. Brashear built the beam director for the THEL project, and is interested in our program. We also held a conference call with J. Albertine and C. Brau on overall progress of the optics WBS in general, and specifically on the performance of the deformable mirror assembly. As a result of this teleconference, we determined there was no need for an on-site visit before the May review.

--George/Fred/dmag