Highlights:
This was a good week for making progress on many of the hardware systems
for the IR Upgrade. See the WBS reports for the (numerous) details.
Management:
The project monthly report for the month of March was distributed earlier
this week.
We thank Eli Zimet for releasing an additional $250k of ONR FY01 funding for the Phase 2 upgrade effort. This brings the project budget to within $50k of the original budget ($4.5M) of the phase 2 work statement. This document will be adjusted accordingly.
The project team continues to work with the JTO office to firm up the contract and start date for the JTO laser materials studies which we hope begins this month. We are also working with JTO and JTO’s contractor on the technical planning for the high power FEL workshop planned for June 5-6.
WBS 4 (Injector):
Completed drawings for the shield assembly (door swing mechanism) and
submitted to the shop for manufacturing. The ceramic stack pieces have
been fitted and stacked, awaiting welding. Design continued on the
interface between the gun and light box, defining an internally tapered
tube at the exit of the gun.
WBS 5 (SRF):
Vendor sight visit to Aboloty Engineering to check on the vacuum vessel
and space frame fabrications. Space frame was found out of tolerance
and vendor is making plans for straightening vacuum vessel top, but flanges
were found out of tolerance and vendor is making plans for a fix.
Vendor site visit to ADC, thermal shield vendor. Inspected parts, material, QA program, and project planning and integration with other contracts. All fabricated parts, materials and programs are in good order.
WBS 6 (RF):
Zone 3 - The circulators were tested this past week.
Zone 4 - RF Control Modules were installed temporarily for an experiment to test the stability of the klystrons by adjusting the filament voltage to control klystron beam current. The missing circulator for position 8 will be installed as time is available.
Injector HVPS - PSC has been given a deadline of next Monday to either provide us a firm price to upgrade their HVPS or no bid our RFP. I am talking with other companies to provide the various components if the task is moved in-house.
Injector Klystrons - In performing a helium leak test on the collector of the first 100kW klystron, CPI, feels they may have received parts that were not made of the specified oxygen-free copper. They are making additional tooling to make a definitive test. This second test is delaying the project 3 weeks. If they have to remake the parts with new copper, the project will slip 3 to 4 months according to their first estimates.
WBS 8 (I&C):
The drive laser pulse truncator specification is complete and the design
is proceeding. Many thanks to Curt Hovater, Trent Allison and the EID group
for their design assistance. This device will insert between the existing
Drive Laser Pulse Controller (DLPC) and allow for electron beam macropulses
(in 500 nanosecond steps) between the existing 1 microsecond and 10 microsecond
selections that currently exist. This will also allow for macropulse frequencies
to extend beyond the existing 60 Hz to 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10
kHz, and to 20 kHz. During the original FEL design it was doubted that
the FEL could even lase in pulsed mode, hence the gap between 1 and 10
microseconds (go figure!). This will be inserted between the DLPC and the
ConOptics 305 mode locker controller. There will be not compromise to the
MPS since it can only "pull down" the E/O cells and not supply power to
gate them ON. This truncator will operate in pulsed, CW and in Alignment
mode. The important feature is that it will be synchronous with the FEL
output pulses; that is phase stable for experiments like Bob Austin's who
require the 18MHz signal to gate the cryodetectors for enhanced noise immunity.
As always Al Grippo will create a simple EPICS screen so all can enjoy.
The viewports have been ordered for the upgrade. An order for 40 pcs.;
4.62 flange fused quartz viewports with a clear aperture of 2.69" was placed.
Once these arrive they will have 4 "blind tapped" holes added for mounting
the beam viewer camera assembly, then have a gold coating sputtered on.
The shop will most likely do the holes and Larry Phillips will supply the
Au. A Golay Cell was also ordered, this will function as a spare for the
Happek interferometers and also be used to evaluate THz radiation from
a port at the 2F region.
A diamond window from ALS was installed at 2F03; the exit of the upstream
optical chicane. This port will be used to evaluate the THz radiation emitted
from the chicane bend. The X-Ray detector's, downstream of the wiggler,
Pb shield was installed and the control/software was updated (moved over
from the scrapers) - the "X" (up/down) & "Y" (right/left) have been
adapted to suit the newly reincarnated operational modes required from
the backscattered X-Ray experiments. There was an ion pump VIP2F00A
which had been "pitching an occasional fit" that was also changed out.
This ion pump acted in the same fashion as did one on the upstream optical
table six moths ago. The symptoms were occasional trips (to the 5E-7
valve closing interlock threshold). The DSP56F805 microcontroller software
is proceeding well. This device is slated to be used for a number
of applications; BPMs, OBPMs, trim PS cards, and for some simple motor
control. The Code Warrior software, including compiler and debugging tools
have been installed. A sample program has been edited, compiled and loaded
with and observed running in the DSP, with variables in memory changing
in accordance with the program. A simple program was also coded to
read a built-in A/D channel. Program appears to work, but have not
yet applied a voltage to see the data change.
Progress has been made for remote control of the mirror test stand YAG
laser; the initial version of EPICS software for monitor/control is complete
and being debugged. The coding for the (new) VME interface board
device driver is complete. The AVME9510 has all of the control and
status functions in a single board (& at a reasonable $); digital in/out
and analog in/out. The field wiring design is being worked out and
should be installed next week. The
LSS connections have been made and tested. The X-Ray DC Motor
has been wired up and is operational through EPICS. The software
control is also completed and being tested for 2 DC motors to be used to
control x-ray detector position.
The Lab #2 LSS low level certification passed (although it was only
done for training purposes). There exist NO known problems with the LSS
master, or any of the labs (except #5 which has not been commissioned).
The new hutch in lab #6 is complete and awaiting a decision on how and
where the penetrations should go. Test boxes were built for testing
the Beam Viewer Chassis and the PLC in the LSS system. The next effort
on the LSS is to clean up the overall system print.
There has been more improvements to the website http://laser.jlab.org
to include a feedback link, technical document links and more system information.
Each of the systems is getting an overhaul - this is critical to have an
accurate "as-built" reflecting all of the changes made over the last couple
years prior to the "rip-out".
Cables were installed in the Drive Laser Clean Room to facilitate OBPM
testing. Some problems have been identified with the new boards;
the AD549 op-amp was laid-out from top view not bottom view - the damaged
chips ere removed and new one soldered in from the bottom of the board.
Testing is continuing, this will also act as a platform for system test
of the pico motor transport mirror control system. A turning mirror
is installed on a picomotor stage; by offsetting the quad detector the
mirror should track. Twelve boxes have been manufactured in the machine
shop and are painted awaiting assembly.
Master machine had the TDR check done on 20 BPM's, these may be complete for delivery next week. Also there are 18 viewers ready to assemble. We should receive a minimum of 9 viewers next week.
WBS 9 (Transport):
Dipoles
Injector Dipoles (DU/DV)
o DULY Research is working on adapting their magnetic model of
the small injector Dipole (GV) into a
practical hardware design.
o They delivered the details of the coil for the GU for checking.
Optical Chicane Dipole (DW)
o The design package is almost ready.
Arc Dipoles (GY, GX, GQ)
o We ordered the material for the pole tips of the GY.
o The magnetic analysis of the GY with path length correctors and now
synchrotron light periscopes continued. At
week’s end David Douglas was given the latest field
values along four paths through the magnet. He was going
to match his particle pusher analysis with the results
found by Tom Schultheiss of AES.
o We continued design and magnetic modeling the Arc Bend Dipole (GX).
We developed the bus bar mounting
scheme to allow upper and lower halves of the coils
to be powered independently and allowed the magnets to
be flipped over 180° with the same hardware.
Because the magnet is an asymmetrical four sided figure; it is
used right side up in two locations and flipped
over in the remaining two locations. Our design makes a
universal magnet that can be used in both orientations.
Quadrupoles
QG (3 inch quad)
o The coil-manufacturing package remains in Procurement cycle.
o The core drawings received minor modifications in anticipation of
signing. Jeff Karn is starting discussions with
Procurement on how best of purchase the cores.
QX (Trim Quad)
o We continued debugging the magnetic model going through several iterations
with the Vector Fields Co. on how
to make it yield proper results.
Corrector Dipoles (DB & DJ)
o The package is in vendor’s hands for a re-bid.
General
o The Dipole Steel continues in Procurement cycle.
o We continued design layout of the girders between cryomodule regions.
o We continued to make advances in the configurations of the arc chambers.
WBS 10 (Wiggler):
Previous magnet measurements showed the field integral in the dispersion
section to be non-zero. A temporary trim coil was wrapped around
all poles to provide a "tweakable" offset. Preliminary measurements show
such a coil can be used to zero out the integral. Additional measurements
are in the works. In the wiggler, temporary coils were configured
on the field clamps to compensate for the "missing pole." Magnet
measurements showed the extra trim coils could be tweaked to balance pole
fields. G. Biallas is pursuing building production coils. C.
Hutton has resumed the design of the test stand hardware. It is looking
like we should be ready to start wiggler measurements by the fourth week
of May.
WBS 11 (Optics):
The design for the ultraviewer is complete; we anticipate the drawing
package going out for bid early next week. Prints for new, near Brewster
windows for the User Labs have been signed and are going to Procurement.
The fabricator for the prototype deformable mirrors has proposed several
changes that will result in cost savings and accelerated delivery.
(What more can a WBS manager ask for?). The rest of the internal
mounting components for the mirror test stand arrived and are being cleaned.
The manufacturer of our laser interferometer, Veeco, has completed the
metrology of the 3" diameter silicon mirrors produced by RMI. They found
that the mirrors met or exceeded specifications, qualifying RMI as a source
for substrates for the IR Upgrade. It was also an excellent test
of the interferometer, because some of these measurements were near the
limits of its capabilities. This gives me confidence it will perform well
as part of the Mirror Test Stand.
We set up a pickoff in the Drive Laser Enclosure that allows I & C to test OBPM detectors. It will also permit testing of the automatic stabilization features of the FEL laser beam before we actually use it.
I had a telephone conference with representatives from NRL regarding the types of instrumentation they are offering to bring to JLab for the Joint Technology Office (JTO) contract
Operations/Commissioning:
No operations this week.