Issue 11; December 7, 2001
Holiday Wishes from the APS
Workshop to Explore Higher Current Operation
User Activity Reports on Web; CD in Preparation
"The Source" Reincarnated
Independent Investigator Program Update
Wishes from the APS
Another festive event is the traditional potluck Holiday Feast, which this year will be held on Wednesday, December 19, 2001. Users can register for this incredible spread on-line at
you'll be able to join APS staff and other APS users for
these always enjoyable holiday celebrations.
to Explore Higher Current Operation
Accelerator enhancements to improve beam stability and brilliance are on-going activities at the APS. During the past year, the APS has instituted top-up operation, as well as developed and implemented a low-emittance lattice that reduces the horizontal emittance by a factor of two. Currently, the magnetic lattice of the accelerator is being altered to improve beam stability by using feedback from insertion device x-ray beam-position monitors (termed the "Decker distortion").
Among potential enhancements to further increase beam brilliance is operation of the storage ring at higher currents. Increasing the stored beam current affects requirements for a number of accelerator components, front ends, and beamline components (shutters, optics, windows, etc.). To fully understand the implications of these altered requirements from both an accelerator and user standpoint, an effective dialog between the APS and its users is essential. If you are interested in attending this workshop, contact Susan Strasser in the APS User Office (email@example.com).
Activity Reports for 2000 on Web; CD in
engine at this address will yield printable pdfs and
reference URLs. Preparation of files for mastering on CD has
now begun. Request for the CD can be sent to Richard Fenner
at the e-mail address above.
"The Source" is designed to serve primarily as a newsletter
for APS employees, news from the experiment hall floor is an
important element of keeping APS staff fully informed. Users
are invited to peruse each issue and suggest items to be
included in future issues by contacting Rick Fenner at the
e-mail address above.
Investigator Program Update
An II can choose to submit either an individual or a program proposal. Individual proposals are valid only for the requested scheduling period; program proposals are valid for a year (three scheduling periods) and should be restricted to experimental programs that need multiple visits over several scheduling periods.
The next II proposal due date (for scheduling period 2002-3, which encompasses May 29-September 3, 2002) is March 1, 2002. However, II proposals may be submitted at any time and will be reviewed as they are received. (If beam time becomes available, individual CATs have the option of scheduling proposals received after the due date for a particular period.)
Further information about the APS II program and II proposal submission forms can be found at the following Web address:
The Argonne Guest House (AGH) will be open through the morning of December 24, 2001, but the AGH restaurant will close at 1:30 p.m. on Friday, December 21, and reopen for lunch on January 2, 2002. Individuals staying at the AGH over the weekend will be served a free continental breakfast.
Grill, located on the lower level of Bldg. 401 will be open
on Friday, December 21, as usual from 5:00 to 9:00 p.m.; on
Saturday, December 22, from 11:30 a.m. until 7:00 p.m.; and
on Sunday, December 23, from 11:30 a.m. until 7:00 p.m. It
will then close for the holiday break and reopen on January
2, 2002, at 5:00 p.m.
currently more than halfway through the first of the three
user runs for this year. After the first week, which was
operated with high emittance, the rest of the time has been
in the standard mode, with over 500 hours delivered with an
availability of over 96%. During the top-up, the beam was
within 1% of the routine fill level for 93% of the time. The
extended operation in the low-emittance mode has enabled the
accelerator physicists to better understand the performance
of this lattice and to plan for further improvements in both
storage-ring performance and beam stability. A period of
hybrid operation in the non-top-up mode is scheduled from
December 11 through the end of the run on December
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