Accelerator Physics Meeting 11/30/00

Present: J. Wei, S.H. Kim, M. Doleans, Weishi Wan,
D.O Jeon, Slava Danilov, Sasha Aleksandrov, Sarah Cousineau, J. Galambos,
Paul Chu

Jie Wei reviewed the status of the upcoming DOE review, and noted 
the need to maintain calm despite apparent turmoil. There are large
cuts in line item and operation budgets (e.g. ring crane, the HEBT
cavities). He noted the need to keep a consistent set of parameters.
Jie reviewed his trip to Sacalay, noting that there is a movement to 
initiate a design of a multi-purpose facility there
(independent of ESS). They are considering starting
from the SNS ring design as opposed to the ESS ring. They are strong 
on the linac, but weak on the ring design. They want to creat a CDR by 
03. There was an e-p R&D review, despite its budget being cut. LBNL
is doing 3-D electrostatic modeling of the electrons,
PPPL doing Vlasov modeling of the ions (minus ring physics). The 
proposal is to continue the LBNL work and get input from previous 
SNS work. 

John Galambos discussed the ICANS workshop and his KEK-JAERI trip.
At ICANS there was strong accelerator representation from the 
JKJ team. They are aggressivly pursuing a spallation source of the same
power level as the SNS, and with a similar schedule. They are strong
on he linac (well along R&D at both KEK and JAERI), but lag behind
SNS in the ring effort. The 3 GeV ring design is being done at JAERI.

Dong O discussed the linac code benchmarking meeting at LANL. L. Young
presented differences in results from parmila and parmela, a baseline
device to be used in comparisons was discussd and the idea
of inputing differnces in the offaxis field (calculated externally).

Paul and Sarah dicussed the latest space charge results at IUCF. The
new chopper was installed resulting in clean injection and storing of
muti-turn injection. Results were shown indicating clean looking
profiles.

Slava disussed the excited state H_o state work. There is an uncertainty
in the state lifetimes, resulting in a  small window of acceptable field 
level for the injection dipole.


Sang ho discussed Q_ext calculations for the fundamental coupler. 6 pass
bands are done. The process is more difficult for the HOM coupler. Field
maps have been sent to JLab. Marc is looking at the cavity misalignement
impacts (e.g. from tilts of cavities). The HOM coupler positioning work
is continuing. A joint ORNL / Jb tech note is being prepared. 

Sasha discussed a MEBT commisioning algorithm that will adjust quad 
strengths to match observed profiles with predicted profiles. A MathCad
program is running, and differnet minimization schemes explored for
robustness.

Weishi Wan discussed the global coordinate status. Some additional
information has been given to the conventional facility people.He noted
that FNAL does not see jitter in their linac.