The CEBAF SRF/RF/CRYO Workshop

Thursday Apr 3, 2014, 8:30 AM → 4:30 PM US/Eastern

ARC 231 (Jefferson Lab)

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.

8:30 AM → 9:00 AM Assemble/Intro

Coffee and Introductory Remarks

8:30 AM Assemble/Coffee

8:45 AM Introduction

Speaker: Arne Freyberger

Slides 00_Introduction.pdf

9:00 AM → 12:00 PM Confronting the Data

9:00 AM SRF Commissioning Data

What data was taken? how is it stored? Data access? Preliminary results.

Speaker: Mike Drury

Slides M01_SRFcommissioningData_drury.pptx

9:25 AM Beam Based and in-situ cavity measurements

Gradient, Qs and trip rates.

Speaker: Jay Benesch

Slides M02_SRF_status_Apr2014_Benesch.pdf

9:50 AM Discussion w/ Break

10:20 AM C50-11 (aka SL10) Performance

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 M03_SL10(C50-11)_drury.pptx

10:30 AM C50-11 Q0 analysis

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 M04_C50-11_Qanalysis_geng.pdf

10:45 AM C100 Performance with beam

C100/R100 performance with beam. Challenges during initial beam operations.

Speaker: Ramakrishna Bachimanchi

Slides M05_C100performanceWithBeam_bachimanchi.pptx

11:05 AM Cryomodule Heat, CHL Loads and CHL1/2 performance during initial beam operations

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 M06_CryoExperience_creel.pptx

11:20 AM Minimizing the Linac dynamic heat load

Data from recent heat load minimization tests

Speaker: Geoff Krafft

Slides M07_LoadManagement_krafft.ppt

11:35 AM C100 Activation

results and implications of c100 activation measurements

Speaker: George Kharashvili

Slides M08_C100activation_kharashvili.pptx

11:50 AM Discussion

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 Reach

CEBAF schedule for beam operations and shutdowns for the next three years.

Speaker: Arne Freyberger

Slides Schedule.pdf

1:15 PM Status of and plans for Plasma Processing

Status and plans of Plasma processing. Recent test results on FEL02?

Speaker: John Mammosser

Slides A02_PlasmaProcessing_mammosser.pptx

1:35 PM Status of C50-12 (aka FEL02)

C50-12 plan, schedule and status. Likely date of return to CEBAF?

Speaker: Joe Preble

Slides A03_C50-12_Status_preble.pptx

1:50 PM Transitioning C100s to operations

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 A04_C100_Transition_mounts.pptx

2:10 PM Minimizing the Linac dynamic heat load (algorithm)

Algorithm for minimization of trip rate and heat load.

Speaker: Balsa Terzic

Slides A05_MinimizingHeatLoadAlgorithm_terzic.pptx

2:25 PM Cryogenic Maintenance and Upgrade Plans

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 A06_CRYO_plans_mwright_R4.pptx

2:40 PM SRF Maintenance

Plan and schedule of SRF maintenance work for Summer 2014 (and beyond). Tuner stand-off modifications? tunnel cabling clean-up?

Speaker: Mike Drury

Slides A07_SRFmaintenancePlans_drury.pptx

2:55 PM RF power Maintenance

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 A08_RFpower_MaintenancePlans_Cooper.pptx

3:10 PM 2.2GeV/pass by Fall 2015 discussion

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 Forward

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.

Speaker: Arne Freyberger