Highlights:
A draft version of the accelerator driver design (Version 1.1 ) was completed this week.
Management:
The project cost-performance report for the Month
of November was completed this week. The project remains essentially
on cost and schedule with a positive schedule variance of $109k and a negative
cost variance of $9k. 22%
of the project was scheduled to be complete by
Nov.30 (assuming an April 1,2000 start), and we have completed 23% by Nov.
30.
WBS 3 (Beam Physics):
A proposal by W. Colson, NPGS, for accelerator physics and FEL studies was evaluated and will be funded.
A draft Revision 1.1 IR Upgrade machine design
was completed and is undergoing performance evaluation studies. This revision
uses "best knowledge" values for initial RF gradients (final energy of
145 MeV suspected) and consequently employs an enlarged injection condition
(bx,y~10 m, ax,y=0)
at 10 MeV (to compensate reduced focussing along the
linac) and asymmetric reinjection conditions
at full energy (for similar reasons). The machine is slightly wider and
shorter and uses slightly different main dipole angles than the Rev 1.0
design. This allows both additional space for correction packages in the
end loops and allows future integration of additional FEL transport lines
(such as the UV) through use of preexisting dipole designs.
WBS 4 (Injector):
Conditioned the titanium electrode in the Field Emission Test system up to 20.83 MV/m. Emission at 20 MV/m on a 6mm gap was 84 nA. The titanium has preformed better than stainless steel but still not nearly as well as the nitrogen implanted stainless steel.
WBS 5 (SRF):
A current status report on the cavities for the new cryomodule:
The second and third production cavities are being completed (EBW) today.
The first cavity is currently being tuned. Cavity 4,5 cells are pressed and are waiting to be trimmed before EB welding. All flanges are machined.
All Beam tubes have had the nipples pulled for HOM tubes and are in chemistry for cleaning. A copper seven cell has been setup to start HOM measurements and two HOM (copper) prototypes have been completed.
The first two Helium vessels have been received
from the vendor and are under going QA.
WBS 6 (RF):
Zone 4 - No progress. Testing is held up until the LCW is repaired. A leak was discovered in the LCW transport line over to the FEL Bldg at the end of last week. The leak was repaired but the LCW loop within the FEL Bldg has to be cleaned up prior to any use of the LCW.
Zone 3 - No progress. Waiting for additional
parts.
WBS 9 (Transport):
Dipoles
• In anticipation of DOE’s approval of the Engineering
Services contract, we composed the interface document and collected its
attachments so that DULY Engineering could productively start the design
of the Injection and Extraction dipoles (GU & GV). This document
will serve as a model for giving the design of the Arc Bend (UV Modified
GX)
the Reverse Bend (GQ) and the 180 degree bend
(GY) to the other contractor.
• During generation of the interface document
above, it became evident that the requirements of the original IR Demo
should be simplified for the upgrade. These magnets could be cheaper.
New assumptions are:
• These magnets would not be used to divert partially
accelerated, straight-ahead beam to the extraction dump for phasing.
• The margin of 20% over field could be decreased
to 10% (11 MeV)
• With the above assumptions, solid magnet wire
with plate cooling was substituted in the GU and GV for the hollow copper
conductor used in the IR Demo.
• We received additional budgetary estimates
for our dipoles and received cost saving construction method suggestions.
• Additional GW dipole detailing continued, concentrating
on simplifying the bolting and alignment pin features as well as making
the hoses larger and altering the magnet lead area in response to the thinner
yoke material.
• We ordered the copper for the GW Prototype.
Quadrupoles
• QX (3.125” Quad) Magnets
Prototype Fabrication and measurement:
magnet assembly was completed and measurements started. Reproducibility
of the pole tip field was measured with a hall probe and repeated to +/-0.03%.
The gradient integral was measured with the existing 2" diameter rotating
coil and found to meet the design spec. Measurements will be made
over the next few days on the 2" harmonic probe to get a feel for the field
quality at the smaller radius. Final field quality measurements,
and the subsequent development of end chamfer modifications, will await
the new 3" probe.
• Budgetary Quote: Several conversations were
held with Magnet Enterprises International (MEI) and hopefully they will
present a quote shortly. A lack of response from two other "new"
coil vendors is taken as a lack of interest and will not be pursued.
• Measurement Probe: Fabrication of the 100-turn
litz coil is progressing. Drawings for the probe body have been signed
off and a local shop has been given the job.
General
• The Engineering Services Contracts remain in
the DOE Office for approval.
WBS 10 (Wiggler):
PECO has started the rough machining of the pole
pieces for the dispersion section. They are expecting the first coil
from their subcontractor the beginning of January. Attachment of
the modified pole clamps has started on the second half of the wiggler.
Design of the dispersion dipole mounting brackets has started. Next will
be the design of the wiggler cover. Finished the design of the wiggler
viewer optical transport assembly. All the major design work is done
for the wiggler vacuum chamber and diagnostics. Detailing should
be done soon. This leaves the dispersion section supports, the wiggler
cover and the measurement jigs as the only things left to design.
WBS 11 (Optics):
Work at AES on the finite element analyses for
the deformable mirror is on schedule. The optics group had an internal
review of the conceptual design of the optical cavity components that was
quite useful, these comments are being written into the specifications
documentation and being passed on to the ME group as input for our designers.
We also had
a discussion on upgrades to the O-BPM system
that will make them operate at wavelengths longer than 7 microns.
Two concepts were identified as being promising, and we are assembling
hardware to try them.
Discussions were held with the two major vendors
of laser interferometers (a diagnostic needed for the mirror test stand).
On the basis of these discussions we will begin the procurement of an instrument.
Operations/Commissioning:
No operations were scheduled this week. Maintenance
activities were done on various optical systems and the LCW system.