Highlights:
We expect to receive tonight at 7:00pm a major deliverable for the
FEL Upgrade Project: the two 100 kW
klystrons for the upgrade injector. After passing all qualifications
at the vendor, CPI in Palo Alto earlier this
month, the two klystrons were shipped to us last night.
We placed our first contract for the manufacture of dipole magnets (GW-the
optical chicanes), and we have
excellent results on the magnetic measurement of the wiggler.
Therefore, all major deliverables for the Phase 1
contract which ends on Sept. 30th are in: the RF systems; the
wiggler, and reviewed designs and first
components on the optical and electron beam transport systems.
Today we completed a successful 2-week run for the Joint Technology
Office on laser-material damage studies.
This completes the full exposure matrix that was presented in the JTO
proposal. For details see the operations
section.
Management:
The science and technology involved in the Jefferson Lab FEL program
was reviewed this week on Sept.
24-26th during the annual DOE Review of Jefferson Lab’s programs.
The FEL program received high marks for
meeting and exceeding technical goals, project planning , and the high
quality science that has been demonstrated
by the FEL users over the past year. The reviewer’s also took
note of the important synergy among the lab’s
advanced accelerator R&D efforts and the lab’s Navy funded FEL
upgrade program and DOE-funded linac
contract for the Spallation Neutron Source.
We completed the project monthly reports for the month of August and
they will be distributed to the DOE and
ONR contract monitors on Monday. We anticipate a smooth close
of the financials for the Phase 1 contract
whose performance period ends on Sunday. We thank the lab’s finance
and procurement staff for their efforts.
The “Work for Others” contract for the Aerospace portion of the UV FEL
effort has been submitted to our DOE
Contracting Officer for approval. We also submitted a CRADA to
DOE for approval. This CRADA involves a
collaboration with STI, Inc to study the design and testing a compact
permanent magnet version of our
recirculation bend magnets.
WBS 3 (Beam Physics):
Beam physics activities and opportunities were reported at the CASA
staff retreat. Compaction management in
FEL drivers was investigated and it was determined that simultaneous
bunch length compression during
acceleration and energy compression during energy recovery was possible
during recirculation/recovery of
multiple beams, and that for a "magic phase" (value available from
your correspondent for a fee) the injected
bunch is imaged at the dump. Provided you're not lasing, of course.
WBS 4 (Injector):
Worked with the cathode shield test setup. It was found that
under vacuum it would still operate but the design
tolerances allowed the mechanism to shift and run stainless against
stainless. We are modifying the design for
better operation. Parts for the cathode stalk were completed by the
machine shop and checked. We will wait to
weld the assembly so we can match machine the stalk seat with the interior
cut in the ball when the ball is
completed. Machining continued on the main gun chamber.
Gun HVPS - The design of the tank and stack mounting continues.
WBS 6 (RF):
Zone 3 - The Cathode Power Supply vendor, Hipotronics, was in this
week to replace a current transducer and
to repair a faulty crowbar circuit. RF power curves were run
for position 1 with attenuators up to 6 dB. This is
to prevent operation on the back side of the power curve.
Zone 4 - Additional RF Control Modules are being calibrated by AES to replace our missing units.
Injector - The second 100kW klystron was tested and approved.
Klystrons S/N - 101 and 102 are to be
shipped from CPI for arrival tonight (Friday). Unit S/N - 103
is expected to be tested and shipped by the end of
October. Parts for the HVPS upgrade are still being received.
WBS 8 (Instrumentation):
A new relay box was developed for remote control of equipment by experimenters.
It allows the EPICS
computer to control switches with a given time delay for more accurate
timing when more than one function is
being performed simultaneously.
The drawing index on the Laser website has been updated to include many new and updated designs.
Material and test equipment control data bases are being developed to
enable us to easily tell our users what we
have available.
Lots of user support this week both for Michelle and the NRL and for the nano-tube experiments.
WBS 9 (Transport):
Dipoles
Optical Chicane Dipoles (GW)
o The contract was placed with Magnet Enterprises International
for 10 of the GW dipoles (6 are required for
the UV line). We are preparing the shipment
of copper and steel to get them started fast.
Injector Dipoles (DU/DV)
o The final round of adjustments to the drawings is almost complete.
Arc Dipoles (GY, GX, GQ)
o Design continued on backchecking the detail drawings of the
bend and Reverse Bend Dipoles (GX & GQ)
with the comments and corrections.
o The rework of all drawings of the 180° Dipole (DY) are
complete for now subject to last minute adjustments.
Magnet Measurement
o Work started on the dipole and quadrupole measurement stands
Quadrupoles
3 inch quad (QX)
o The assembly quotations are in evaluation.
o Work continues on cores and coils.
Trim Quad (QT)
o This magnet is in the procurement cycle.
Sextupole (SF)
o Work continued on the magnetic model as well as the drawings.
Octupole (OT)
o DULY Research generated their report on their successful design.
They are now in discussions on how to
convert the magnetic model into a physical device
as an extension of their task order.
Corrector Dipoles (DB, DJ)
o Milhous Co. is working on the remainder of the coils.
o The mechanism necessary to mount the DB/DJ coils on to the
new large diameter BPMs was signed and sent
for bid.
Beam Line and Vacuum
o The exit and entrance of the Optical Chicane chambers were
settled this week.
o The girders and pedestals necessary for the return leg and
the hardware for the entire machine entered into a
procurement cycle.
o Design work continues on the regions between the cryomodules.
o Work continued on the injector line stands and vacuum chambers.
WBS 10 (Wiggler):
Initial wiggler measurements indicate that the DC field has been overcompensated.
When a 5.3 G DC field is
added to the measured field the attached trajectory is found.
The trajectory is straight to better than 50 microns
with a peak to peak wiggler amplitude of 1.3 mm. As expected
for an electromagnetic wiggler, the field quality is
exceptional. The end correction also appears to be quite good
with no end pole kick in evidence. Finally, the
trajectory offset from the initial position is less than one wiggler
amplitude, which is what was expected. The
vertical field indicates a probe angle of 1.2 degrees.
We will attempt to fix this and the DC fields before taking
final scans. So far, no problems with the wiggler field have
been seen. We lost a week of effort on the wiggler
vacuum chamber last week while the vacuum cleaning facility was moved
to the test lab addition. This is delaying
the completion of the vacuum chamber as well. The final machining
of the first chamber is done and the second
chamber is ready for welding. The first chamber should be complete,
including QC and cleaning, next week.
The second chamber should follow by a few days.
WBS 11 (Optics):
We are continuing to order components for the optical cavity.
We've also begun to detail the electrical and water
connections. We are now turning our attention to other optical
components, holding meetings on, the insertable
mirror that diverts the output of the FEL to power and energy detectors.
The first article of our new, near-Brewster window assemblies passed
inspection, and is being cleaned for
vacuum service. The other window assemblies were received this
week. We received new IR cameras from
Raytheon; they are a much-improved version of the cameras we use now
to monitor beam position in the optical
transport (at one point in the accelerator vault, in the optics control
room, and at the end-of-line.
Operations/Commissioning:
This week we have been running experiments for the JTO-funded materials
studies, and at this writing 15:00
9/28) have irradiated 300 targets, 156 since last Friday. As
we did last week, we supported two visiting
scientists from NRL, who are using their diagnostics to observe the
targets during irradiation. We also hosted
Dr. Dennis Burianek from Lincoln Labs, and irradiated targets of interest
to his organization.