Bob, Ken and Geoff,
I'd like to build on the work that the Gradient team and Strategic
RF PIT has accomplished in the the past year. The success over the
past year was partially the result of have well defined problems to
address. With that in mind I am going to propose two
themes/problems that I'd like both teams to work together in
addressing.
- Physics has stated that CEBAF must deliver beams with
an energy/pass of 2.1 GeV/pass or higher in the Fall 2018.
CEBAF is presently at 2.1 GeV/pass with an acceptable trip
rate. Energy loss over the next two years will degrade CEBAF's
energy reach making delivering 2.1+ GeV/pass in Fall 2018
questionable (understatement). The task then is to develop a
plan by the end of Mar. 2017 to maximize the probability that
CEBAF can deliver beam at the required energy in Fall 2018 (and
at 2.1 GeV/pass for all operations between now and Fall 2018).
The plan should not assume that funds will appear to solve the
problem but should focus on maximizing the installed SRF/RF/Cryo
base equipment. I've attached a note that was developed to
assess the situation for Fall2016 energy reach options to spark
the discussion. The Mar. 2017 date is not arbitrary, as the
plan needs to be well reviewed prior to Summer 2017 so that the
work during the Summer 2017 and Summer 2018 are effectively used
to achieve 2.1+ GeV/pass in Fall 2017 and Fall 2018.
- Determine the contributing causes to the under performance of
the C100s. The gradient team has identified the C100
under-performance as the main reason why CEBAF is not reaching
its design energy. In May of 2012, one C100 was operated fully
beam loaded (485 uA) with an energy gain of 104 MeV. This type
of performance, in GDR mode with beam, has not been observed
since this test. Why? Beam studies time can be used to
collect data.
It may be beneficial to name a leader/champion to organize and lead
the effort.
I am looking forward to the conversation!
Arne
--
Arne Freyberger
Director of Accelerator Operations
Jefferson Lab Office: (757) 269-6289
12000 Jefferson Avenue Cell: (757) 876-6289
Newport News, VA 23606 Email: freyberg@jlab.org