Highlights:
The FEL operated well this week
for the continuation of the winter FEL user run. We were pleased
to provide beam all
week to Prof. Robert Austin of
Princeton university for continuation of his experiments on energy flow
in biomolecules
using the amide I aborbance at
6 microns.
Management:
We completed the cost accounting
for the January monthly report which will be distributed next week. As
of Jan. 30,
2001 the project is 29% complete
vs. 26% scheduled. We have a small favorable schedule variance of
+253k and a
small negative cost variance of
-$228k.
We also completed a draft of a new
cost performance plan that will accommodate the accumulated Ecru's during
the
current Phase 1 of the project
and the new Phase 2 of the project commencing this month. We plan to have
this draft
reviewed by the contract monitor
so that it can be used for the project cost performance reports starting
with the
February report.
WBS 3 (Beam Physics):
A linac to linac UV bypass solution
was completed. It provides for placement of the wiggler in the pit. Preliminary
analysis
indicates single particle performance
(chromatic, geometric) is adequate, but analysis is ongoing. Machine error,
CSR, and other collective effects have not yet been investigated.
WBS 4 (Injector):
Continued work on field emission
reduction. The FET system will be modified to collect more data, looked
at
mechanisms involved in field emission
reduction.
Gun HVPS - The vendor, Glassman, is ready to start work on the Gun HVPS as soon as we can get our spare unit shipped to them.
WBS 6 (RF):
Zone 3 - No Progress. Actually, 4 Filament boards were removed and installed in zone 4.
Zone 4 - Four faulty Filament boards
were replaced. The problem of the Cathode Power Supply tripping during
initial
turn on was solved by operating
it in Zero Start By-Pass mode. The vendor will be in next
week to tune the Circulator for
klystron #8. The discrepancy was resolved for the various RF power
readings for
klystron #2.
Injector RF - CPI is having a problem
getting their vendors deliver the various parts. It appears the first
100 kW klystron
delivery will be about a month
late at 5/18/01. This will have no impact on the program.
There is nothing new to report
on the upgrade of the HVPS for the Quarter.
WBS 8 (I&C):
This week continued with operations
support. A divide-by-two was added to the 37 MHz monitor in the clean room
to
produce a clean 18 MHz reference
synchronous with the FEL micropulses, thanks to Hovator et.al.
New Printed circuit board for OBPMs
is at the vendor. Expect delivery early next week so we can get these
operational. Thank you to
EECAD for the rapid turn-around on the re-work. The new picomotor controller
chassis, which will control the
transport mirrors, is being tested and should be ready soon.
Video problems in labs 2 and 3 have
been corrected and we now have these areas available. Work continues
on the
user power supplies for each of
the labs.
Four outstanding drawings were submitted
to EECAD on 2/22 for the final updates and should be signed off soon.
We
are in the process of gathering
existing drawings into a central location in the FEL for use
by everyone.
Discussions continue for commercial
trim cards. A number of companies have expressed interest. The motivation
for
changing is a higher current is
needed and the replacement cost for the 10 amp cards
(complete 32 channel rack) is ~
$4000 per channel - my target price is <$2000. The new system would
also address real
time monitoring - the current
system can not tell if the current had fluctuated putting you off loop.
A new FEL task management system
is on the FEL website. Anyone desiring to submit a task for optics
or I & C are
encouraged to use this system.
The link is: http://laser.jlab.org/task
WBS 9 (Transport):
Dipoles
Injector Dipoles (DU/DV)
o DULY Research resolved
their magnetic model’s anomalous tapered field results by going to a finer
mesh.
They continue
working the on the 3D drafting model as well as the 2D details.
Optical Chicane Dipole (DW)
o We continued incorporating
backcheck information into the DW drawing package.
Arc Dipoles (GY, GX, GQ)
o AES continued the layout
the coil's leads and lead stabilization comb, incorporating the cover,
the leads, the
bus bars and
the hose fittings into a single system.
o AES continued the axisymmetric
2D magnetic model of the GY, finding there is indeed a 8.5 to 10 inch
wide good field
region over the full range of excitation using silicon steel boundaries
that are within the coil
on the inside
edge and in the gap on the outside edge. They are now creating a
3D magnetic model
for final magnetic
verification.
Quadrupoles
QX (3.125" Quad)
o Measurement Probe: The
coil support plate’s coil slots are within acceptable tolerance so that
the coils may
be installed,
the stabilization cap glued on and the end journals assembled.
o Design Package: The QX
drawing package was modified to incorporate the latest mounting and machining
scheme and are
in checking.
Sextupole with H/V Correctors
o Robin Wines continued work
on the magnetic model of the Sextupole, finding the automatic mesh
generator makes
meshes that yield unallowed harmonics, a clear indication of improper use
of the model.
She is working
on creating a mesh that has boundaries that yield zero unallowed harmonics.
o David Douglas clarified
the specifications of the sextupole, significantly tightening them to 1
part per
thousand over
the good field region. We will need the properly made mesh (above)
to resolve errors of this
level.
General
o We reworked the budget
such that the 180° bends, the optical chicane bends and the reverse
bend
chambers will
be bought with Phase 1 funds. This will have to increase the level
of support from engineering
for the chambers
in order to achieve these critical procurements.
o The layout of the UV add-on was
superposed on the overall machine layout and found to match so no
changes to the
IR machine were necessary.
o Girder arrangements are
firming up. We will make individual girders for each quadrupole,
re-use the old
stands and cartridges,
and use long beam pipes through the triplets, (forcing alignment to do
a rough
alignment before
the tube is inserted). The arrangements of diagnostics for the IR
machine were
simplified as
the layout progressed. The result was greater commonality of stands
and girders leading to
simplified design.
o We defined the alignment requirements
for the dipoles with the help of Chris Curtis. We will specify
machined-in
tooling ball holes at the factory with possible vendor CMM verification
on all magnets
other than the
180° Bends. The latter, we will establish the fiducial locations
on site. Injector dipoles
will have a
surface for a machinist’s level.
WBS 10 (Wiggler):
o Dispersion Section: The dispersion section is assembled and will be shipped next week.
WBS 11 (Optics):
We signed off on the drawing package
for the deformable mirror assembly, and are awaiting results of our RFQ.
More
parts for the mirror test stand
arrived, namely the flange that the electrical and water
feedthroughs are mounted on.
The vacuum vessel is being welded today, and will be leak checked early
next week.
We ordered new quadrant pyroelectric
detectors from Molectron, and will use them to see if we can get more reliable
performance over a larger range
of displacements. We've also determined that the electronics on the
detector are very
pulsewidth dependent, and have
asked I & C to implement a better scheme. In the meantime, we
have mounted the
PyroCAM to take the pick-off from
the OBPM in the OCR (optics control room), and will use it to monitor the
beam
position.
In the course of supporting operations,
we supplied parts and technical assistance to our primary user, and assisted
in
reconfiguring the hutch in User
Lab 3 for metal-treatment research. We had a brass fitting on one
of our water-cooled
laser power meters split during
owl shift, and when operations began in the morning, learned that some
7.5 gal of cooling
water had been dumped onto our
purged optical table in the OCR. We are working with the vendor to
understand why
the fittings are splitting.
Operations/Commissioning: