MEMORANDUM

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

cc: Division (M7), FEL Coordination Group

From: F. Dylla

Subject: IR Demo Project Weekly Report, October 20-24, 1997

Date: October 24, 1997

Management

On Friday, Oct. 24 monthly reports (for September) for both the IR Demo construction project and the commissioning and upgrade project were distributed to the NRL and DOE Program Offices.

Also on Friday, the Chairman of SURA's Marine Technical Advisory Committee (MTAC), Adm. Baciocco visited the laboratory for an update on the FEL project and planning for the Dec. 9-10 MTAC meeting.

Three more pre-proposals for basic science experiments with the IR FEL were forwarded to the DOE-BES Division of Chemical Sciences for review.

Installation Activities

The last vacuum connection in the injector assembly, between the injector x-chamber and the linac cryomodule, was completed. The linac is now under vacuum from the photocathode gun through the linac cryomodule including the injector dump-line. Final alignment of the injector beamline components was also completed.

The high voltage elbow for the gun power supply was reinstalled after being removed for rewelding and leak-checking. It was leak checked and now successfully holds the required static pressure of SF6/N2.

The diagnostics for the wiggler vacuum chamber were cleaned and installed. The completed wiggler vacuum chamber passed particulate and leak-tightness tests.

Vacuum chambers that were removed last week from the optical chicanes were modified for installation of beam position monitors. These chambers are scheduled for cleaning this weekend and re-installation next week. Vacuum installation activities continued for the energy recovery and 42 MeV dump-lines.

Commissioning Activities

With successful re-installation of the high-voltage transmission line for the gun, preparations are underway to start operating the photocathode with the drive laser next week. Goals for next week include: testing the photocathode with the buncher cavity powered, verifying operation of the drive laser, and training people on the respective controls and locations of the hardware.

The PSS for the cryounit was certified and low-level srf commissioning of the cryounit commenced on Tuesday.