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J. Cook, D. Helms, W. Skinner
Division (M7), FEL Coordination Group
F. Dylla
IR Demo Project Weekly Report, June 28-July 2, 1998
July 2, 1998
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Management
Highlights for the week include processing the gun at 500 kV, working to improve the beamline
vacuum around the machine, and checking out the bunch-length interferometer at the entrance to
the cryomodule.
Professor John Foley from Mississippi State University arrived this week for a six-month
sabbatical during which he will work on designs of advanced optical cavities.
Ken Weeks of Duke University Medical Center visited Jefferson Lab today (2 Jul 98). His
interest is cardiovascular radiation therapy using radioactive stents, about which he presented a
seminar. He is pursuing the possibility of using the electron beam from the FEL accelerator driver
to irradiate the stents.
Contact with Optics & Photonics News using a press kit regarding the news of 155 watts has
resulted in a phone interview with Fred Dylla and Hermann Grunder. The reporter is very
thorough and also contacted DuPont and Duke University to balance the story. The article is very
favorable. A second magazine, Lasers and Optics will also be writing a story covering this event.
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FEL Installation Activities
A concerted effort was made toward restoring good vacuum after changing out the eight defective
valves and completing the beamline. The beamline leading to the straight-ahead dump was baked
and its vacuum is recovering. The beamline leading into the first optical chicane is under a warm
nitrogen purge, as is the beamline through the first recirculation arc and the back leg. These lines
will be reconnected and pumped down this weekend. The vacuum in the injection line is slowly
recovering. It could not be baked due to the proximity of the elements occupying this beamline.
The Happek interferometric bunch-length monitor recently installed in front of the cryomodule
was aligned and checked out without beam.
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