Highlights:
We are pleased to thank Governor Gilmore and his administration who
announced this week a new $1B bond
issue for support of higher education in Virginia that includes a $3M
line item for the planned addition to the
FEL User Facility building to house the compact synchrotron and injector
test area. If the bond issue is
approved by the Virginia legislature in the upcoming Jan.-Mar. 2002
session and by the Virginia voters in
November 2002, then the funding would be available in July of 2003.
This same bond issue includes support
for many science programs (particularly materials science and bioscience)
at Virginia’s research universities
that are involved with the FEL user program.
Management:
Jefferson Lab will have a DOE review of our nuclear physics operations
budget next month on Jan. 22-24. The
FEL project management will be presenting the impact of the FEL project
on the lab operations in terms of
contributions to maintaining the lab core competencies (SRF and other
accelerator physics) and the supporting
labor for these efforts.
DOE approved the UV FEL project subcontract to the Aerospace Corporation
for their effort toward the
design and fabrication of a UV laser microfabrication tool for use
with the FEL Upgrade. Our thanks to our PI
at Aerospace Corp, Henry Helvajian, our support from JLab business
services (R. Lusk and T. Danforth) and
our DOE contracting officer, Wayne Skinner, for their assistance in
this effort.
We are continuing discussions with Cornell University, which is working
on a prototype energy recovered linac
x-ray source involving a source current of 100 mA , and with Daresbury
Laboratory in the UK , which is also
working on a next generation light source, about potential collaborations.
Jefferson Lab has a tentative visit next Wednesday (Dec. 19th)by several
Congressional staff members from
the Senate Armed Services Committee for a tour and briefing on the
FEL program.
WBS 4 (Injector):
We completed a high voltage emission test on a stainless steel electrode
that was implanted
in the re-commissioned plasma/ion implantation system operated by CWM.
We are using
this test sample and others to benchmark the system before we implant
the new electrodes for the Upgrade
gun. This test electrode was quiet up to 25 MV/m but started emitting
above that level and would not condition
out. The ball cathode was final machined (ready for polishing)
and had the stock (wafer holder)
match-machined to the interior step. The gun stand drawings were
signed off and submitted for fabrication
bids. The wafer shield rear operation link and bellows drawings were
signed off and submitted to the shop for
fabrication.
Gun HVPS Tank - Meetings were held this week to help firm-up the tank
design. No date has been set for the
release of the drawing package. RCD was contacted this week concerning
the combined running and
conditioning resistors.
WBS 6 (RF):
Injector Klystrons - The wiring of the 1st klystron continues.
The LCW water leaks have been stopped. The
initial 1/2 power tests appear to be firming up for the 1st or 2nd
week of January. CPI was notified and they
may want to attend to witness these tests.
Injector HVPS - An outside vendor has been contacted to remove the present
heavy components from the
HVPS's and install the new heavy components. Their price is less
than it would cost us to purchase the
necessary equipment. The HVPS tear-out is starting Friday on
Unit 3. Unit 4 tear-out will start after the
klystron tests are completed.
WBS 8 (Instrumentation):
A trip was made to Varian this week to work out response time for their
cold cathode controller. The demo
unit they had provided for upgrade work and SNS interlocks had been
setup improperly. The response time
has gone from 8 seconds to 2 millisecond. Tune into the website
for more details: http://laser.jlab.org/sns.
An inventory control system is being developed to support the barcodes
that were assigned to components prior
to commencing the rip-out portion of the upgrade. This system
is nearing completion and will be expanded to
include instrumentation chassis, test equipment and other "portable"
equipment as requested.
The FLOG system is being enhanced to make it easier to access and provide a search feature.
Design of the new stepper motor control chassis is underway. The
intent is to double the number of channels
available without any increased "real estate" requirement.
Cable removal in the vault continues.
WBS 9 (Transport):
Dipoles
Optical Chicane Dipoles (GW)
o Magnet Enterprises International in Oakland, CA, was under
a cure notice on our two contracts, QX
coils and GW complete magnets. They spent
the week concentrating on QX coils because of our
request that they have higher priority. Work
slowed on the GW coil as they also resolved coil form
dimensions. The actual potting was delayed
again to next week. In the interim, they started rough
machining the core pieces.
Injector Dipoles (DU/DV)
o Concerns about the extent of the injector dipole field integral
quality in the return beam zone and
about the pinch in the injector chamber forced by
the field clam slider for the wide portion of the
dipole. In both cases there seems to be no
problem. DULY Research magnetic model results
indicated the GV Dipoles have specification good
field integral to the edge of the field clamp
sliders. Further analysis indicates that we can
also slide the above slider an additional 3/4 inch with
no loss in field quality.
o With the above results and the review of drawings and specifications
we did this week, we should
be able to sign off the drawings and get these magnets
into procurement. The requisition is signed
and we will do another electronic procurement as
we did successfully on the 180 degree (GY)
Dipoles.
Arc Dipoles (GY, GX, GQ)
o Advanced Energy Systems (AES) is revising the drawings of the
pole tips of the Bend Dipole (GX)
to reflect the magnetic model results.
o Tom Schultheiss of AES is now bringing the Reverse Bend Dipole
(GQ) magnetic model in
conformance with the improvements to the GX
o The responses to our questions on the 180° Dipoles (DY)
were received on Tuesday and
evaluated. We are requesting Best And Final
Offers (BAFOs) which are due Monday.
Magnet Measurement
o The parts for the dipole measurement stand are being fabricated.
o Measurement of the corrector dipoles continued.
Quadrupoles
3 inch quad (QX)
o The core vender, New England Techni-Coil (NTC) is waiting on
our resolution of the quality of QX
coils before assembling the first article.
o Jeffrey Hubrig of Innovation Services continued monitoring
the production of QX Coils at Magnet
Enterprises International (MEI), bringing their
cure temperature of the coils within epoxy cure
guidelines by doing a calibration on the oven in
a dry run followed by an actual cure per the lessons
learned in the dry run. Simultaneously, he
reports a complete turnaround of the vendor on all issues
raised in the cure notice of last week. They
should be able to continue production soon as directed
by our Procurement Department.
o The remaining issue of the lowered cure temperature used by
MEI on the initial batches of coils
was resolved. Jeffrey Hubrig was able to test
the epoxy hardness of a series of rejected coils from
all the lots. They all registered Shore hardness
in the 80s while the maximum hardness reported by
the epoxy manufacturer is 92 for an ideal cure.
These strengths indicate that though the cure is not
ideal, the strength is substantial enough the coils
will not be falling apart or warp during service. We
will therefor accept the coils and authorize NTC
to start assembly.
Trim Quad (QT)
o The magnets are in fabrication at Milhous Control of Virginia.
Sextupole (SF)
o DULY Research continues to model the sextupole.
Octupole (OT)
o Work on this magnet is on furlough until the sextupole is designed.
Corrector Dipoles (DB, DJ)
o The magnets are being qualified on the measurement stand.
Beam Line and Vacuum
o Work continues at AES on the design the Arc Chambers.
o Design work on girders and stands continued. Parts for the
regions between cryomodules are being
prepared for signature.
o The layout of the telescope in front of the first arc is complete,
accommodating David Douglas’
latest revision that works better for the UV line.
o All the new three leg pedestals in fabrication.
o Chuck Hutton has drawn up the brackets for the skew sextupoles
that we will need at the ends of
the Cryomodules. He is now working on making
a two pair of Haimson like Correctors, suitable for
high temperature bake that have to be mounted in
the gun solenoid. (Haimson Research declined to
make a high temperature version of their coils.)
WBS 10 (Wiggler):
Commissioning measurements were completed on wiggler 1. Due to
the need to divert resources to other
tasks, the commissioning measurements on wiggler 2 will be delayed
a few weeks. Analysis of the wiggler 1
measurements is ongoing. Calculations of the spectrum from the
entire wiggler using measured fields are
being used to figure out how to set up the wiggler for optimum lasing.
The setup for production of X-rays is
also being studied as a test case of the tunability. It works
differently than expected but it does work.
Continuous tunability of the wavelength is possible by keeping the
relationship between the wiggler and
dispersion strengths fixed on a curve which has been derived.
The vacuum chamber is complete and awaiting
completion of final commissioning measurements for installation.
WBS 11 (Optics):
Progress for the upgrade was made in the following areas:
The ultraviewer was tested and found to meet specifications. Several
parts omissions were found in the
drawings, and revisions will be issued. One technical issue (fairly
easily solved) will be discussed before the
rest of the ultraviewers are assembled.
The detailing of the design for the optical cavities has reached the
point where the drawing package for
components from the "big C" (the yaw axis yoke) through the mirror
holders is now in review. We received
the rotary feedthroughs and stepper motors for the optical cavity assembly
y-axis motion. The ball bearings for
the leadscrew have been cleaned for high vacuum use. They appear
to be usable as-is. Because of the low
cost and potentially high payoff, one pair is going to be coated with
dicronite and then evaluated for particulate
generation. Purchase of the rails and pillow blocks for the optical
cavities (plus spares for the test stand) are in
procurement.
The OCMMS tests continue. The new position sensitive detector arrived.
Decommissioning/Other Activities:
We identified parts of the IR Demo that we won't use for some time
and moved them to the Metrology lab for
storage. We assisted the Hall A Compton polarimeter team with
the change out of the mirrors in the high
finesse cavity. We gave a tour to David Sutter and Bruce Strauss
of DOE HEP.