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

cc: Division (M7), FEL Coordination Group

From: F. Dylla

Subject: IR Demo Project Weekly Report, January 19-23, 1998

Date: January 23, 1998

Management

As a follow-up to last week's LPC Workshop, a meeting has been scheduled with DOE-BES Program Office on Feb. 5th to discuss potential FEL R&D activities.

On Jan. 21, the project monthly reports were finalized and distributed to DOE and the Navy Program Office.

On Thursday, Jan. 22, Fred Bomse, Yoon Sik Oh, and K. M. Wu, from the Center for Naval Analysis (CNA), visited the lab for a tour of the FEL facility and a tutorial discussion on FEL technology.

On Fri., Jan. 23, F. Dylla visited the Physics, Chemistry and Engineering Departments of Virginia Commonwealth University, in Richmond, to discuss potential FEL collaborations and presented the Physics Colloquium with an update on the FEL user facility.

The DOE site office and the Jefferson Lab Accelerator Division have agreed that the FEL Accelerator Readiness Review will need to be held in early May prior to conduct of user experiments. We will plan accordingly.

Installation Activities

The engineers from Svetlana were here this week to witness the tests of the spare 50 kW klystron and to fix it if possible. The unit would only make 20 kW before failing. It will be returned to the vendor for replacement.

Tests to find two 8 kW klystrons and a spare for the FEL cryomodule were started this week. The results to date are mixed and the tests will continue.

RF software is being modified to make the Injector more robust. Tests are planned for today.

The last DV magnet was installed and the alignment checked. It will be wired and connected to LCW later.

The second beam current monitor cavity was installed and wired to the control room. The prototype BPM was also wired to the control room.

The controls for the raster magnet for the Injector dump, 0G, was finished.

The leaks in the nitrogen and SF6 lines were fixed. The SF6 system is complete.

The bake of the gun was finished this week. The magnets and the diagnostic equipment were also reinstalled. The gun's high voltage power supply tank is being charged with SF6 today. The gun will be ready for high voltage processing next week.

The HeNe alignment laser was installed for the optical cavity. The modified mirror and the associated electrical wiring were installed this week for the collimator. A remotely powered photodiode was installed to measure the drive laser's SHG power.

In the 3F region, the straight chambers were installed adjacent to the 180° bend. In the 4F region, the first insertable dump was installed on its girder. It will be wired and connected to the beam pipe later.

Commissioning Activities

Resumption of FEL commissioning is planned to begin 2 Feb. 98, although this date could slip a few days depending on availability of the liquid-helium plant. As we "wait," we actively continue to anticipate and fill commissioning needs. For example, this week we more thoroughly identified necessary modifications to RF software related to active fine-tuning of the accelerating cavities, and we made plans for their implementation. This includes incorporating the magnetostrictive tuners into the software along with provisions for driving them based on a current-dependent set point.

Work continues on installing and configuring the Machine Protection System (MPS). It remains to interface the defocusing quads and raster magnets on the dump lines and finish instrumenting the dumps. A meeting was held on 22 Jan 98 with the principals to ascertain required settings, and appropriate follow-up will take place. We currently estimate that the MPS necessary to run 1.1 mA cw in the injection line to the injector dump will be in place by 10 Feb. 98, and that needed to run 1.1 mA cw to the straight-ahead dump will be in place by mid-February, both commensurate with the commissioning schedule.

We arranged for Prof. Uwe Happek's (Univ. of Georgia) student, Michael James, to come here in mid-February to install the injection-line bunch-length monitor and check it out. The second monitor, to be located prior to the wiggler, will be installed in mid-March.

A current-monitor cavity was installed on the injection line prior to the X-chamber, and cabling was put in place. This will be a nice, independent, calibrated diagnostic for measurement of injector-beam current.

The procedure for CW Setup for First Light was completed, and all that remains is to post it on the Web.