CESR is primarily a light source.
This has been true since 2008, when the electron-positron
collision program ended (ending accelerated somewhat by economic
conditions of the time). The particle collision detector, CLEO,
has not been in operation since then and will be completely
removed from the ring this summer. CHESS (Cornell High Energy
Synchrotron Source) is now the primary user of the beams. In the
last few years, we have added undulators to our wigglers.
It most certainly makes sense for the electrons and positrons to
go different directions, since they are in the same beam tube, and
curve oppositely under the magnetic fields. I believe we are the
only facility in the world foolish enough to operate this way.
Imagine how much fun it was modifying the e+ and e- orbits to fit
down an undulator.
If you want to hear more about what is happening with CESR &
CHESS, including the Chess Compact Undulators, our annual user
meeting is coming up soon, 2016-06-07.
http://www.chess.cornell.edu/
This year's Ithaca Festival is 2016-06-03 - 2016-06-5 if you want
to make the trip doubly worthwhile.
On 05/28/2016 01:05 PM, Harry Powell wrote:
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type="cite">
Hi David
I don't think that CESR is primarily
a light source, is it? Isn't it primarily for colliding
positrons and electrons (in which case it makes sense for them
to go different ways round the ring...).
Harry
--
Dr Harry
Powell
Chairman of International Union of
Crystallography Commission on Crystallographic Computing
Chairman
of European Crystallographic Association SIG9
(Crystallographic Computing)
CESR at Cornell has the electrons
going counterclockwise. Our positrons go clockwise.
On 05/28/2016 12:55 PM, Harry Powell wrote:
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hi folks
I was wondering (since I'm
currently sitting at a lovely new synchrotron) if there
are any synchrotron light sources out there that have the
electrons going round the ring anticlockwise (as viewed
from the top...)? All the synchrotrons I can think of have
the electrons going round clockwise...
Does anyone on ccp4bb know?
Harry
--
Dr
Harry Powell
Chairman of International
Union of Crystallography Commission on
Crystallographic Computing
Chairman
of European Crystallographic Association SIG9
(Crystallographic Computing)
--
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All Things Serve the Beam
=======================================================================
David J. Schuller
modern man in a post-modern world
MacCHESS, Cornell University
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