FEL Upgrade Project Weekly Brief
September 11-15, 2000


The big news this week at Jefferson Lab is the announcement made on Monday that our Lab Director, Hermann Grunder, will be leaving on Nov.1 to accept a position as Director of Argonne National Laboratory.  Hermann was and always will be the inspiration for the FEL project at Jefferson Lab.  The FEL Team and all of our colleagues at Jefferson Lab thank him for his 15-year stewardship of Jefferson Lab and wish him well in his new endeavor.  The following are press releases concerning Hermann’s transition:

Virginian Pilot, http://www.pilotonline.com/news/nw0912gru.html
Daily Press, http://www.dailypress.com/news/stories/17117sy0.htm
Richmond Times Dispatch, http://www.timesdispatch.com/vametro/MGIVMMJW0DC.html


We began planning with the FEL team and with our Navy contract monitor (J. Albertine), for the agenda for the next 6-month review on the FEL Upgrade project which is scheduled for Oct. 23rd at Jefferson Lab.

WBS 4 (Injector)

A nitrogen ion implanted electrode has been installed in the electrode test stand in preparation for our measurement of the high voltage
breakdown limits of this surface treatment (which is one of the candidate surface treatments for the upgrade gun design


In the cavity area, we tested the new vacuum seal arrangement for the 7-cell cavities that involves the use of Al-Mg diamond-shaped gaskets with Nb-Ti flanges.  The flanges have successfully passed ambient temperature leak tests.  Cold tests will follow.  Nb cells for the first four cavities have been pressed and will now move to frequency measurement and weld-up.  Material is on hand for the remaining 4 cavities.

We received the final proposal from the vendor that will be manufacturing the warm-to-cold waveguide sections.  The proposal is
under evaluation.

WBS 6 (RF)

The installation of the RF hardware for the third cryomodule position (Zone 4) is essentially 95% complete.  Only the klystrons remain to be installed and then testing of the Zone 4 RF system can commence.  For the second cryomodule position (Zone 3), the low level racks are complete and the HPA is about 50% complete.  Procurements have been written for the HPA HVPS, the circulators and the klystrons.

This week we signed off on the technical specification for the HVPS for the HPA for the 100kW RF system in the injector (Zone 2).  It will be sent to procurement to begin the order process.

WBS 8  (I & C)

Preparations continued in getting the contracts on the street for the 3" BPMs (44) and for the 3" shielded beam viewers (36).  The prices are >$50 K for BPMs, and > $150 K for the viewers. In addition to having the jobs bid locally packets will be sent out to qualified vendors that Beam Instrumentation people from BNL, APS, Fermi, and LANL have used.  This will get us the best product & price.  These contracts given time to bid and pass through procurement should be awarded in 3 to 4 weeks.

Improvements continue to be made on electron beam and FEL diagnostics; the new sample/hold & integrator system is tested and operational.  The FEL main control menu has been gone over to remove obsolete and redundant control screens.  This will ease the transition to having CEBAF operators controlling the various systems.  Also progress has been made on user lab patch and network systems.

All should welcome Daniel Sexton; he has started as a student last week and will be assisting in most all of the FEL Instrumentation & Control activities.

WBS 9 (Transport)

Beam Transport System (WBS 9)
Details of the steel yoke parts (30% of the details) of the GX Prototype are ready for checking.  The 3D model the of the GX dipole, using the optimum bump on the pole edge was constructed and ran to completion.  The results are being processed to assess the improvement.

o  Poles:  L&L Tool machined the first of four poles.  We will measure it for conformance to the ideal shape.
o  Coils:  J. Dail attached the cooling plates to the coil set for the prototype.
? Budgetary Quote:  Everson Electric will be here on Sept. 22 to give their estimate.

o  We started discussing the various options for diagnostics, beam handling and dump size requirements with Dave Douglas.

o  Responses to the business and technical questions about the proposals for the engineering services contract were received and evaluation started.

WBS 10 (Wiggler)

o  We formulated a plan to see if we could bring the pole tips into conformance with the gap specifications by simple assembly technique.  If the plan is unsuccessful or not repeatable for several re assemblies, we may be forced to use the clamps and spacer bars that we thought we could abandon.  An insulator plate and its mounts for the main leads of the NG Wiggler were missing from the drawing package and will have to be drawn and fabricated.  Copies of the drawings and specifications were made for the dispersion section.  The packages will go out on Monday.  In discussions with BNL we found out that we can not use their magnetic
measurement apparatus to characterize our wiggler sections because the maximum length is limited to 2m with the BNL apparatus.  We are investigating options using ANL or commercial equipment.

WBS 11 (Optics)

The design work is proceeding on the mirror test stand.  We took advantage of this week’s run for further check-out of the on-line
optical diagnostics.  This week we received the pyroelectric array IR detector which we plan to incorporate in the spectrometer in the optical diagnostics room.  This will allow real time display of the output spectrum to the operator and users.


This week the FEL was operated for Gunter Luepke from the Dept. of Applied Science at the College of William and Mary.  Gunter and his team are continuing their studies of the dynamics of hydrogen vacancy complexes in silicon (their first results were recently published in Phys. Rev. Lett 85,1452, 2000).  His preliminary results from this week’s work appear equally as exciting and worthy of publication.

No further user runs are scheduled until the October run. As usual, our current user requests for the Fall run exceed the run period time allotment by a significant margin.

Privacy and Security Notice
Privacy and Security Notice