Navy IR Demo Contract WBS Elements:
WBS 1 Project Management
Final negotiations on related documents that allowed DOE Oak Ridge
operations office to sign-off on the DOE-Navy Memorandum of Agreement
were completed on June 11, marking the official start of the project.
The related documentation concerned the rate of indirect cost
recovery that the project will be charged and transfer of the
IR FEL cryomodule (WBS-3) from a Navy account to a DOE account.
With these changes a new cost book and earned value charts were
prepared and distributed to Cost Account Managers.
A method for archiving and accessing project documentation was
designed and implemented using Jefferson Lab's web pages (under
jlab.org//....). A web directory in this area boots to requirements
documents, reports, drawings, meeting minutes, etc., pertaining
to each WBS element of the project.
WBS 5.0 Instrumentation & Controls
WBS 5.0 provides electron beam instrumentation, a personal safety
system (PSS), machine protection system (MPS), and control system
hardware and software.
The beam instrumentation suite has been finalized. Progress has
been made in getting quotes for production quantities of the items.
The area radiation monitors and control computer have been ordered
for the IR Demo building. Hazard assessment has begun. The machine
protection hardware from Argonne Lab has arrived and will be incorporated
into the Injector Test Stand for evaluation. The drive laser
pulse and frequency control prototype is complete and will also
be evaluated in the ITS.
The control cards for the vacuum control system have been ordered.
Racks have been secured from SSC surplus that will be used in
the new building.
WBS 6.0 Cryogenics
WBS 6.0 provides the helium transfer lines (TL) between the linac
cryomodules and related Central Helium Liquifier (CHL) and related
instrumentation.
100K$ transfer line pipe procurement was awarded. The order is
due July 12 and one third has been received. Detail design of
FEL/CHL transfer line (TL) bayonet can for CHL is released for
procurement and fabrication was started on July 1, 1996. Detail
design of FEL TL anchor at CHL was released for procurement and
fabrication will start in July. Preliminary design of FEL Building
Return Transfer Line has started.
WBS 7.0 Transport
WBS 7.0 provides the electron beam transport system components:
magnets, magnet power supplies, vacuum system, support structures,
beam dumps, and instrumentation and cooling water.
Engineering design of the main pi bend magnets proceeded according
to plan. Initial layouts have been turned into draft drawings
of the system while calculations of coil parameters and return
yoke thicknesses are being performed. Significant help on the
engineering design was received from a Northrop Grumman engineer
loaned under a CRADA agreement. Prototype testing of the return
leg quadrupoles is ready. The quads use an existing lamination
but with reduced iron to weaken the field to match the transport
focusing requirements at these energies. Layouts of the entire
system incorporating the diagnostic additions and proper layout
of the dumps was done and checked by the team. Weekly updates
to the drawing now tend to be minor corrections.
The power supply hookup pattern was established to allow specifying
the power and regulation requirements. It has been determined
that a spare box power supply from the CEBAF arcs can be used
to power the primary chains with shunts to allow for fine adjustment.
WBS 8.0 RF Systems
WBS 8.0 provides the RF power systems for the linac cryomodules.
The 2nd HVPS for the 50 kW klystron was prepared for testing next
month. Several parts were replaced that were damaged in shipment.
Worked out the design details for the rupture disk that will
protect the waveguide and components in the unlikely event that
a water load window should break. The rupture disk will be located
in the waveguide adjacent to the 50 kW klystron. The design is
complete and the prototype is tested for the low head water system
for the 50 kW klystron cavity cooling. Tested the first of the
50 kW RF circulators under full power conditions and with a fully
reflective load. It provides a good match to the klystron under
all power and load conditions. The second circulator is due to
be shipped from the factory on July 8. The phase control loop
for the cathode drive laser was closed this month with the E.O.
photodiode, the "Divide by 40" chassis, and the RF Module
in the loop. The indicated phase stability was ± 0.1°
at 1497 Mhz. The last braze is complete on the high gradient
buncher cavity. The braze looks very good, and the cavity is
leak tight. We are now waiting for the flanges to be welded so
that we can put it under vacuum and complete the full power RF
testing. The mechanical design of the Arc Detectors Sensor Blocks
was finished and put into production. The printed circuit board
for the Arc Detector electronics is in the process of being assembled
for tests. The Chopper Cavity and its water skid were tested
to 130 watts. The input probes were overheating at this level
and will be upgraded to meet the 200 W design goal. The second
higher order mode (HOM) filter arrived from Titan Beta, and we
are getting set up to make microwave measurements on all of the
HOM filters at the same time.
WBS 9.2 Injector Move
WBS 9.2 provides for removal of injector after completion of tests
in the Injector Test Stand and reinstallation of this hardware
in the FEL building.
HV Engineer has started work on the high voltage power supply
modification but is awaiting input from the manufacturer before
proceeding further.
WBS 9.4 Wiggler
WBS 9.4 provides the 2.7 cm period wiggler and associated vacuum
system and support structure.
Evaluated bids for the IR Demo wiggler from STI optronics and
Danfysik. The STI Optronics proposal was judged acceptable by
the evaluation board. Their BAFO was $124K with an accelerated
delivery schedule of only eight months. An award based on this
BAFO was made on July 1. A review of the magnetics design will
be held at the vendor in July.
Began design of the wiggler support girder and came up with design
concept for the supports.
Ordered two dimensional magnet design software from SIM Limited
to analyze the proposed wiggler design.
WBS 9.6- Optical Systems
WBS 9.6 provides the optical cavity optical transport system from
the outcoupler to the User Labs, and associated optical instrumentation.
Experiments were set up to assess the mirror mounting scheme for
heat conduction, spectrometer schemes to aid in commissioning,
and an interferometer to determine cavity length changes. Physical
optics codes are being refined to determine the optimum optical
parameters of the transport optics, given there will be some distortion
in the transmissive elements. Progress is being made in modeling
the effects of coating absorption on the mirror distortion, and
negotiations are ongoing to have the coating absorption measured
at ~ 3 µm. Better estimates on optics costs are in and component
contracts will be awarded in July.
Injector, SRF, Facility, and Other
Activities Outside Navy IR Demo Contract
Injector
Photocathode gun development proceeded through high-voltage testing into the vacuum bake. The gun assembly successfully demonstrated a hold-off of 400 kV for greater than 5 hours. The entire beamline was then wrapped with insulation and heater tape and a week-long vacuum bakeout procedure was initiated. Following the bake, plans are to condition the gun to about 300 kV and operate it with beam at about 250 kV. This conservative strategy will enable commissioning of the diagnostics, provide operational experience, and probably sustain the integrity of the ceramic stack. The data will enable validation of the space-charge algorithm in the code used to design the injector. In the meantime a second stack will be fabricated. New ceramics are on order, and they have higher glassy content for presumably less charge buildup. After the initial experiments, we will decide whether to use the existing stack or the new one for high-voltage (>350 kV) operation. We are installing photoinjector pulse selection equipment, and a student is working on optical diagnostics and pulse modification experiments.
Two cavity pairs have been tested with new HOM Loads and new cold
windows as candidates for use in the injector cryounit. New cold
windows have resulted in increased Q0 performance
by approximately a factor of two. Q0 performance
meets specification with the new cold windows. Work continues
on the warm windows. Copper plated nickel eyelets have been procured
for incorporation into new warm windows. Cryounit instrumentation
wiring design has been completed.
SRF (WBS-3)
WBS 3 provides the 32 MeV linac cryomodule.
Draft design of the beamline components has been completed. Work
will continue with completion expected in July. Testing of the
injector cryounit will aid in validiting the cryomodule design.
Beam Physics (WBS-2)
WBS 2 provides accelerator physics support for design and modelling
of IR FEL performance.
Detailed planning for upgrade to 1-micron output capability was
started. Decided to design all major dipole magnets for operation
up to 79 MeV and thereby provide for possible energy upgrade.
Initial studies are underway to determine the optimum approach
for including a second cryomodule to produce the higher-energy
beam. The theory of transient coherent synchrotron radiation
and its effect on electron-beam emittance progressed through preparation
and submission of a manuscript to Physical Review Letters.
Commissioning (WBS-4)
WBS 4 provides planning for IR FEL commissioning and operation.
Planning for commissioning progressed in earnest. Autosteering
capability has been added to enable rapid day-to-day resetting
of the electron beam and fast optimization of the acceptance of
the recirculation loop after coarse adjustments to the electron-beam
energy. Required augmentation of the diagnostic suite is inexpensive.
In addition, development of fast diagnostics for bunch-length
measurements and beam-position monitoring in the recirculation
bends was initiated. These diagnostics are based on coherent
transition radiation or diffraction transition radiation. Hosted
a visit by Fiorito and Rule of the Naval Surface Warfare Center
for a related seminar and discussions. Considerable progress
was made toward identifying the requirements of infrared cameras
to serve in this capacity as viewers.
Facility
The construction of the FEL facility began in June by the contractor
Mid-Eastern. The site was cleared of vegetation. Survey markers
to guide initial preparation efforts and a management trailer
have been set-up. Digging of the foundation had commenced by
month end with significant progress in digging out the main linac
area.
Upcoming Meetings
IR FEL Commissioning Workshop July 24, 25 at Jefferson Lab
Navy High Energy Laser Program Review July 30 at NRL
International FEL Conference and August 26-30 at Rome
Applications Workshop