1.1 Goal of the workshop
Within the last year cavity performance data has been collected on every cavity in CEBAF. This includes 242 original C20 cavities, 88 refurbished C50 cavities and 88 C100 cavities. In addition data exists on the initial performance with beam of the accelerating system. The goal of this work shop is to present the data that has been collected, develop working groups, if needed, to fully analyze the data and develop a plan for maintenance and improvement of CEBAF SRF systems and cavity performance.
Participants
Andrew Hutton
Anna Shabalina
Arne Freyberger
Balsa Terzic
Charlie Reece
Clyde Mounts
Crystal Baker
Curt Hovater
Evelyn Akers
Fulvia Pilat
Ganapati Myneni
Geoff Krafft
George Kharashvili
Jay Benesch
Jiquan Guo
John Mammosser
Jonathan Creel
Joseph Preble
Kenneth Baggett
Larry Phillips
Leigh Harwood
Mark Wiseman
Mathew Wright
Matthew Bickley
Michael Tiefenback
Mike Drury
Paul Vasilauskis
Pavel Degtiarenko
Peter Knudsen
Ramakrishna Bachimanchi
Randy Michaud
Rick Nelson
Robert Rimmer
Rongli Geng
Stephen Cooper
Steve Suhring
Tom Powers
Venkatarao Ganni
Will Oren
William Merz
8:30 AM
→
9:00 AM
Assemble/Intro
Coffee and Introductory Remarks
8:30 AM
Assemble/Coffee15m
8:45 AM
Introduction15m
Speaker:
Arne Freyberger
Slides
9:00 AM
→
12:00 PM
Confronting the Data
9:00 AM
SRF Commissioning Data25m
What data was taken? how is it stored? Data access? Preliminary results.
Speaker:
Mike Drury
Slides
9:25 AM
Beam Based and in-situ cavity measurements25m
Gradient, Qs and trip rates.
Speaker:
Jay Benesch
Slides
9:50 AM
Discussion w/ Break
30m
10:20 AM
C50-11 (aka SL10) Performance10m
C50-11 Qs, gradients, onset field emission data. Any remaining regions of interests in improving C50 Qs. Is this a dead horse?
Speaker:
Mike Drury
Slides
10:30 AM
C50-11 Q0 analysis15m
Data of magnetic/magnetized components surveyed. Correlation of C50-11 Q0 of individual cavities with the ambient magnetic field at SL10 slot.
Speaker:
Rongli Geng
Slides
10:45 AM
C100 Performance with beam20m
C100/R100 performance with beam. Challenges during initial beam operations.
Speaker:
Ramakrishna Bachimanchi
Slides
11:05 AM
Cryomodule Heat, CHL Loads and CHL1/2 performance during initial beam operations15m
Status of the CHL-1/CHL-2 systems and performance during initial beam operations. Linac loads, pressure stablility and hat management to be presented with a bias towards cryogenic system needs.
Speaker:
Jonathan Creel
Slides
11:20 AM
Minimizing the Linac dynamic heat load15m
Data from recent heat load minimization tests
Speaker:
Geoff Krafft
Slides
11:35 AM
C100 Activation15m
results and implications of c100 activation measurements
Speaker:
George Kharashvili
Slides
11:50 AM
Discussion10m
Speaker:
ALL
12:00 PM
→
1:00 PM
Lunch (provided)
1:00 PM
→
4:30 PM
Planning
1:00 PM
Long term schedule and CEBAF Energy Reach15m
CEBAF schedule for beam operations and shutdowns for the next three years.
Speaker:
Arne Freyberger
Slides
1:15 PM
Status of and plans for Plasma Processing20m
Status and plans of Plasma processing. Recent test results on FEL02?
Speaker:
John Mammosser
Slides
1:35 PM
Status of C50-12 (aka FEL02)15m
C50-12 plan, schedule and status. Likely date of return to CEBAF?
Speaker:
Joe Preble
Slides
1:50 PM
Transitioning C100s to operations20m
What is needed to complete the hand-off for robust operations of the C100s by operators and crew chiefs. What is the plan? What is the schedule?
Speaker:
Clyde Mounts
Slides
2:10 PM
Minimizing the Linac dynamic heat load (algorithm)15m
Algorithm for minimization of trip rate and heat load.
Speaker:
Balsa Terzic
Slides
2:25 PM
Cryogenic Maintenance and Upgrade Plans15m
CHL plans during the summer shutdowns, with emphasis on the impact to the Linac. Topics include: CHL-1 Maintenance summer of 2014, proposed 1.5kW external heater, modifications to support Linacs at 2K on one CHL, and anything else.
Speaker:
Mat Wright
Slides
2:40 PM
SRF Maintenance15m
Plan and schedule of SRF maintenance work for Summer 2014 (and beyond). Tuner stand-off modifications? tunnel cabling clean-up?
Speaker:
Mike Drury
Slides
2:55 PM
RF power Maintenance15m
RF power maintenance planned for the Summer of 2014. R100 Kylstrons installation. Estimated consumables (klystrons, controls) for the next several years of operation.
Speaker:
Steve Cooper
Slides
3:10 PM
2.2GeV/pass by Fall 2015 discussion30m
Gradient maintenance. What needs to be done? What can be done at 2K? What can be done at 4K? Estimated time needed. Must, Shoulds and Likes
Speaker:
ALL
3:40 PM
RF/SRF Path Forward20m
With little gradient headroom, constant vigilance is required to achieve peak performance from the RF/SRF/Cryo systems. How shall we proceed? A strawman proposal will be presented and morphed into a robust plan with institutional buy-in from all parties. Peace in the middle east and an end to world hunger will be achieved, as well , during this discussion.