Management Highlights:
A presentation on biological applications of the
FEL was given to the Virginia Joint (House/Senate) Subcommittee on Science
and Technology. The group is investigating ways the state legislature
can encourage the development of biotechnology in Virginia.
The role of the FEL as an attraction to the “superstars” of the field was
discussed.
A small group visited Fishkill, NY, to investigate
the compatibility of the IR Upgrade design with higher energy photon production.
Physical interferences, control system status, and documentation were all
reviewed. No major hurdles were seen.
Design/Construction Activities:
Beam Physics (WBS 3.0):
WBS 3 activities continued apace this week. A JLAB Technical Note documenting longitudinal phase space management issues in the Upgrade driver is forthcoming, CSR work is ongoing, and discussions/work on BBU/other wakefield, space charge, and lattice error effects are underway.
WBS 4.0
We installed a nitrogen implanted SST cathode with a 1 um polished SST anode into the field emission test system. We then started HV conditioning with a 1 cm gap up to 105 kV before baking to ensure the system is operating properly. Work will proceed on this next week.
RF Systems (WBS 6):
Writing continued on the specifications
for the cathode power supply.
Assembly continued on the Zone 3 and Zone 4 Rf
systems.
Instrumentation (WBS 8):
A technician to support development of the instrumentation
and controls was chosen for hire. The offer package is being assembled.
We continued preparing viewer and BPM bid packages
and resolved several issues regarding procurement approach, make/buy, etc.
Beam Transport System (WBS 9)
Dipoles
We started detailing the GX Prototype.
We have found the optimum bump on the pole
edge of the GX dipole using a 2D magnetic model. We are now introducing
that bump into the 3D magnetic model.
Quadrupoles
Poles: L&L is setting up fixturing
for machining of first article quadrant. Plan on visiting vendor
today.
Coils:
The fifth (spare) coil was confirmed DOA, lacking ~ 50 of the 350 turns.
There are no plans to build a replacement. J. Dail has completed
fabrication of the cooling plates with the attached cooling lines.
He is in the process of prototyping the process of attaching the cooling
plates onto the coils.
Budgetary Quote: The drawing package for
the quad was sent to Everson Electric on August 29th. Expecting response
by the week of September 18th.
General:
Business and technical questions about
the proposals were sent to the remaining Offerors in the engineering services
contract.
Wiggler (WBS 10)
Manifold fabrication continues.
We measured the pole tip gaps. They
have about a 0.002 inch gradient and the center gaps were larger than the
ends by several thousandths. Kevin is working on improving those
readings and making them reproducible. An assembly procedure guaranteeing
better gap uniformity is being developed.
Dispersion Section
The specifications were signed and the
package was given to the fabrication office to get bids from 6 vendors.
The coil specification and the dispersion section
assembly specification were signed off.
Optics (WBS 11):
Conceptual designs of the Optical beam Position
Monitoring (OBPM) system were reviewed and Okayed. The system will
be tested in the existing Optical Transport System. Monitoring detectors
have been received and position controllers of several types will be ordered,
tested, and evaluated as to compatibility and reliability.
Pyroelectric array diagnostics for spectral measurements
were installed in the OCR for characterization. Initial use will
be manual with the full software suite added when functionality has been
confirmed.
A pyroelectric detector with chopper was
added to the OTS as a real time macropulse power diagnostic when married
with a new sample and hold circuit. This will be tested on the next
laser run.
The Modemaster system was realigned and checked
out in preparation for more detailed studied of mirror heating distortion
and its effect on the FEL lasing process.
A designer is preparing drawings of the planned
mirror test stand which will be used to characterize performance of the
controllable curvature mirror.
Measurements of the HVAC and sprinkler systems
uncovered potential conflicts with positioning of the new OTS. We
will decide soon which system to move.
Beam Operations
The electron beam was turned on in preparation
for a User run next week. A number of hardware problems were uncovered:
a shorted transformer in the rf buncher supply, a 2.5 W amplifier blown,
access control problems in the drive laser clean room, and a burned out
transistor in the drive laser mode locker chassis. As of this writing
these systems were being put back together and prepared for turn on.