SSRLUO EXECUTIVE COMMITTEE
May 14, 1999
Attendees: P. Allen, S. Barrett,
B. Clemens, P. Foster, B. Rupp, D. Salt, S. Traina, T. Trainor, J. Wong
Absent: J. Bilello, D. McKay, R. Scott
DIRECTOR’S PRESENTATION (K.
The SPEAR3 scope has expanded and the
schedule has been accelerated since the original projections in the Lehman
Review. The project will be funded by DOE and NIH. The $14M FY99 funding
option agreed to by NIH will allow for a new Rf and the capacity to run
at 500mA. The MOU between DOE and NIH is complete and in the process of
being signed. Funds should be released with a specified start date of June
1. Asked whether the influx of NIH funds will impact DOE’s management status
of the lab, Hodgson reported that he didn’t anticipate any major shift
in management oversight but that this will be something SSRL management
will closely monitor in Washington, DC.
The increase to 500mA will impact projected
beamline upgrade costs by approximately 2.5 times the original estimate.
P. Pianetta and T. Rabedeau are heading a task force to modify the original
beamline upgrade plan to handle the 2.5X increase in stored current. Future
potential beamlines are also being explored.
Structural Molecular Biology
An appointment for Dr. P. Kuhn as assistant
professor in structural molecular biology is in process and expected to
be complete for a September 1, 1999 start date
Dr. J. Stohr will join the SSRL faculty
as a professor in January ’00
Profs. M. Greven, Z.X. Shen, R. Laughlin
and S. Doniach submitted a proposal to DOE under the new initiative materials
program which would develop a new research program in correlated materials
which would utilize BLs 7-2 and 11-3. The scientific program should help
develop a framework for a new material diffraction beamline (possibly BL
NIH-General Medical Sciences is funding
6 staff members to support the general users of the protein crystallography
beamlines, as well as additional advanced instrumentation
NIH is interested in developing national
or regional synchrotron centers. This could lead to a partnership with
ALS and streamlined access to both labs.
The Linac Coherent Light Source (LCLS)
26-pole wiggler exceeds all performance
specs and has been mated to vacuum chamber
BL 11-2 will be used for XAS studies of
toxic and radioactive samples; 3 FTEs will be funded from DOE
BL 11-1 will be a joint venture with Stanford
University and The Scripps Research Institute (TSRI) for protein crystallography
research with 1/3 of the beamtime available for general users; 3 FTEs will
be provided by TSRI.
Leone Panel delivered a positive report
in Feb ’99 that provided the clear justification to initiate an R&D
program focussed around LCLS
R&D program will involve a multi-laboratory
collaboration (SLAC/ANL/LANL/LLNL/UCLA/BNL) with DOE funding beginning
Possible project start date in FY02 or
Pierre Capeder will be leaving SSRL this
month. Pierre was recognized for many excellent contributions to the growth
of the lab over the past 14 years.
Suzanne Barrett will depart at the end
of July due to her husband’s job relocation.
After detailed internal discussions, as
well as meetings with the SSRLUO and Proposal Review Panel, it was decided
to increase the minimum percentage of small angle scattering on BL 4-2
to 75% when BL 11-2 is fully functional.
Plan to expand the hutch to accommodate
non-SAS users and facilitate the transition between SAS and non-SAS setups.
The increased SMB use will be advantageous in securing beamline upgrade
funds in the future.
SPEAR3 UPGRADE PROJECT (B. Hettel)
Hettel summarized the current status of
the SPEAR 3 accelerator upgrade project. He reviewed the differences between
the existing magnet lattice and the one for SPEAR 3, which has an order
of magnitude less beam emittance and which will produce smaller beam sizes.
The reduced emittance and increased beam
current (up to 500 mA) will increase photon beam focused flux density and
brightness by an order of magnitude on insertion device beam lines, and
up to two orders of magnitudes for higher photon energies on bend magnet
The upgrade involves replacing the accelerator
magnets, vacuum chamber, RF system and other components during a single
6-month shutdown, preceded with preparatory work in prior 2-3 month shutdowns.
The availability of SLAC personnel seen
as big advantage and will reduce the number of new hires for the project.
Magnets will be built in China through
a collaboration with IHEP (Beijing) with a considerable cost savings. Five
engineers from the PRC are due in June, but there are concerns over the
current status of US-PRC relations and its impact on the collaboration.
Fermilab is a possible alternative magnet fabrication site, but there would
be both cost and schedule impacts.
The preliminary magnet production schedule
spans CY99-01 with installation in April '02.
A decision was made to make the vacuum
chamber out of copper which will improve its thermal conductivity and make
it passively safe for mis-steered dipole radiation. This will reduce the
complexity of the orbit interlock system, which now will only have to protect
against mis-steered insertion device radiation. The chamber will be built
The expected delivery time for SPEAR 3
beam to users is ~Dec '02.
BEAMLINE UPGRADES: (T. Rabedeau)
Of the 25 functional beamlines 18 are
designed for 100mA and 7 for 200mA. The three stations under construction
are designed for 500mA. Thus the decision to run SPEAR3 at 500mA will require
a comprehensive beamline upgrade program.
Benefits of SPEAR3 include increased flux
(5-20x), reduced beam size, and improved stability.
Upgrade challenges include the increased
power density (5-14x), higher optical performance requirements and the
aggressive upgrade schedule.
Anticipate using LN cooled monochromators
for power densities >2W/mm2 and intensively water cooled mono crystals
up to 2W/mm2
BL 11-2 will have the first LN mono at
SSRL; anticipate commissioning this summer
Upgrade program includes new single crystal,
Si mirrors with side cooling for most high power beamlines
Plan to replace existing 9-pole wigglers
on beamlines 4 and 7 with 18-pole wigglers which will allow for more flux,
a "squarer" fan, and reduced orbit excursion.
Beamline upgrade project estimated at
Committee was asked to consider whether
it would be preferable to migrate SPEAR3 to 500mA as fast as possible (ie.,
before all bend magnet beam lines were able to accommodate the increased
power loading) or raise the ring current in concert with the power rating
of the beam line with the lowest safe power rating. In the former case
some beam lines would have carbon filters installed to reduce the beam
line power to an acceptable level or individual branch lines could be temporarily
S. Barrett reviewed the user demand
for the first two-thirds of the FY99 user run which averaged 147% across
all beamlines. Beamlines 6-2, 7-2, 9-1, and 10-2 exceed 300% user demand
(note: a fully subscribed beamline is equal to 100% user demand). The user
community remains relatively pleased with the quality of the beam (83%
rating the beam Excellent or Very Good). Overall satisfaction with beamtime
was rated Excellent or Very Good by 79% of respondents. When asked about
any common themes in user complaints, it was pointed out that the difficult
start up in November as well as the RF problem earlier this Spring was
a consistent complaint.
The committee was informed that the
excess housing that Stanford was trying to secure from Moffet Federal Airfield
is no longer an option for inexpensive user accommodations. The housing
will be used by Army personnel that have been forced to vacate the Presidio
in San Francisco. It was asked whether SSRL could adopt a European-type
mode of funding graduate student expenses through scholarships or travel
grants. Barrett will look into this and get back to the committee on the
feasibility of such a program.
The need to further define the criteria
for the submission and evaluation of this year’s recipient of the annual
Farrel W. Lytle Award was discussed. It was decided that all nominations
should be accompanied by a 1-2 page letter outlining the nominee’s qualifications
or contributions to synchrotron-based research at SSRL. It was agreed that
both SSRL staff and the user community are eligible for the award. Specific
criteria will be drafted by J. Wong and forwarded to the committee for
review. The annual Lytle Award winner will be posted on the SSRL web page
and in the annual Activity Report. The evaluation committee will consist
of the SSRLUO-EC, Farrel Lytle, and a representative from SSRL.
J. Wong discussed the need to have
more formal check-out procedures at the beamline. It often takes the x-ray
experimental support group several hours to realign the beam and configure
it for the next user group. The process could be simplified if the departing
user group was required to document how the beamline was left. Barrett
will discuss the proposal with H. Tompkins to determine how bad the problem
is and how best to solve it without creating too much of a burden on the
users or staff.
It was suggested the web version of
the User Support Form be amended to include a text box to add setup details
that aren’t necessarily called out in the standard form.
The committee felt it was important
to improve communication between the Executive Committee and the general
SSRL user community. It was agreed the Barrett would send out a brief email
to the user community informing them that a SSRLUO-EC meeting had been
held including the major topics of discussion and where to find the detailed
minutes on the web.
There was some concern about the projected
6-month shutdown for SPEAR 3 and its effect on the user community. Most
members felt that as long as users were given sufficient notice to plan
their research and grant activities accordingly, as well as to investigate
the experimental access procedures at other synchrotron laboratories, the
impact could be minimized. The 6-month shutdown is projected to begin April
Problems encountered when trying to
FTP files for the annual Activity Report submission will be looked into
with L. Dunn and the computer group. Asked to include a summary computer
update during the next meeting.
Questions: with the new SPEAR 3 capabilities
will there also be improved experimental support facilities, including
more storage space? Can we provide dry ice?
Previous SSRLUO Minutes
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