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The 32nd Advanced ICFA Beam Dynamics Workshop on Energy Recovering Linacs

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Program of WG3: SRF and RF Control

Sunday, March 20, 2005
8:00-8:30Continental Breakfast - ARC 231/233
WG3 Session - Introduction and Overview (Chairs: Dykes/Knobloch) - ARC 231/233
8:30-8:45 Presentation of WG charge and preliminary agenda
8:45-9:05 Brief outline of proposed ERLs, Beard (Daresbury)
9:05-9:40 Development of a baseline set of parameters which will be examined during the workshop and for which the SRF linac will be developed
WG3 Session - Cavities/Module (Chair: Knobloch) - ARC 231/233
  Status of superconducting module development suitable for ERL application, current research areas:
9:40-9:50 CEBAF modules, Funk (JLab)
9:50-10:00 RIA modules, Grimm (MSU)
10:00-10:10 ELBE modules, Teichert (FZR)
10:10-10:20 BNL module, Calaga (BNL)
10:20-10:30 TESLA Modules, Knobloch (BESSY)
10:30-11:00 Coffee Break
11:00-11:20 Discussion: Module overview - What components are needed in an SRF module and which items are critical
WG3 Session - Cavity Cell Shape/Design (Chair: Knobloch) - ARC 231/233
11:20-11:50 Optimizing the cavity shape for ERLs, Calaga (BNL)
11:50-12:20 Discussions
WG3 Session - HOM damping and power requirements (Chair: Liepe) - ARC 231/233
12:20-12:40 Discussion: Expected HOM power and damping requirements
12:40-13:00 HOM calculations/predictions & overview of damping schemes, Rimmer
13:00-14:00 Lunch (provided) - CEBAF Center
14:00-14:15 Characterization of ferrites at low temperature and high frequency, Shemelin
14:15-14:25 New Scheme of HOM mode damping of L-band s.c. cavity using a radial transmission line, Umemori
14:25-14:50 Discussion: Available coupler designs
WG3 Session - High Q Operation (Chair: Knobloch) - ARC 231/233
14:50-15:20 Cavity preparation/assembly techniques and impact on Q. Realistic Q-factors in a module, review of modules, Kneisel (JLAB)
15:20-15:30 Discussion: Required Q-factors for ERLs, optimization of bath temperature, magnetic shielding, recovery options if performance degrades
15:30-16:00 Coffee Break
16:00-16:15 Discussion: Required Q-factors for ERLs, optimization of bath temperature, magnetic shielding, recovery options if performance degrades
16:15-16:45 Revisit module layout. Summary & conclusion of discussion


FEL Tour - Leaves from CEBAF Center Lobby

Monday, March 21, 2005
8:00-8:30Continental Breakfast - ARC 231/233
WG3 Session - Microphonics, Tuners, RF Control (Chair: Liepe) - ARC 231/233
8:30-8:45 Experience with microphonics in CW modules, Liepe (Cornell)
8:45-9:05 Discussion: Required damping of microphonics to satisfy RF power requirements & RF stability
9:05-9:25 Discussion: Passive schemes to damp microphonics
9:25-9:45 Active means of damping microphonics: State of the art & approaches tried for multicell elliptical cavities, Grimm (MSU)
9:45-10:05 Discussion: Critical items to enable active damping in elliptical multicell cavities
10:05-10:20 Task: Create table with list of measures peak and rms microphonics values and microphonic specs for proposed ERLs
10:20-10:30 Roadmap R&D
10:30-11:00 Coffee Break
WG3 Session - Tuners (Chair: Dykes) - ARC 231/233
11:00-11:25 Overview of existing tuner systems, pros/cons, Daly (JLab)
11:25-12:00 Discussion: Design requirements - stiffness, mechanical design, resolution, integration in module
12:00-12:20 Discussion: Reliability issues
12:20-12:35 Task: Create table with list of tuner parameters, procs/cons
12:35-12:45 Roadmap R&D
WG3 Session - RF Control (Chair: Liepe) - ARC 231/233
12:45-13:00 Discussion: Requirements for RF control, what drives these requirements?
13:00-14:00 Lunch (on your own)
14:00-14:25 Overview of options for RF control & State of the art, simulation results and performance test results, Simrock (DESY)
14:25-14:35 Discussion: Noise Sources
14:35-15:00 Discussion: Hardware design (digital, analog, I/Q, A/Phi, required sampling frequency, filters, ...)
15:00-15:30 Coffee Break
15:30-15:40 Discussion: Implementation of feedforward for beam loading (injector) and ion clearing gaps
15:40-15:55 Pushing QL, Liepe (Cornell)
15:55-16:10 Discussion: High-Q operation, vector-sum control with high-Q cavities, Start-up with high Q cavities (fast turn on, Lorentz-force detuning).
16:10-16:30 Task: Create table with list of achieved field stability at different loaded Qs and stability specs for proposed ERLs. R&D Roadmap
16:30-17:15 Working Group Status Report - CEBAF Center Auditorium
17:15-17:30 Group Photo - CEBAF Center Lobby
17:30 Buses to Dinner
18:00-21:00 Workshop Dinner at the Mariners Museum

Tuesday, March 22, 2005
8:00-8:30Continental Breakfast - ARC 231/233
WG3 Session - Couplers (Chair: Dykes) - ARC 231/233
8:30-8:50 Discussion: Requirements (SW Power, tenability, coupler kicks, cryogenic losses, cost)
8:50-9:15 Overview of the current couplers including limitations in reaching higher cw power levels, Campisi (SNS)
9:15-9:25 Dealing with Multipacting in Fundamental Power Couplers for SRF Cavities, Stirbet (JLab)
9:25-9:50 Discussion: Input coupler designs, create table with list of input couplers with main specs, pros/cons
WG3 Session - RF Power Sources and Transmission (Chair: Dykes) - ARC 231/233
9:50-10:05 Discussion: RF power requirements (CW operation, pulsed operation for cavity conditioning)
10:05-10:25 Review of available RF sources, Dykes (Daresbury)
10:25-10:35 Status of the RF system for the JAERI ERL FEL, Sawamura (JAERI)
10:30-11:00 Coffee Break
11:00-11:10 Discussion: Requirements for the RF transmitter (efficiency, reliability, stability, cost, ...)
11:10-11:20 Discussion: Transmitter/distribution layout
11:20-11:30 R&D Roadmap
WG3 Session - Assembly, Transfer to Industry (Chair: Dykes) - ARC 231/233
11:30-11:45 Summary of current industrial capabilities & near-term future plans, Vogel (ACCEL)
11:45-12:00 Discussion: Model for industrial production
12:00-12:20 Discussion: Designs to enable clean, industrial assembly, safe transport, installation, alignment procedures
WG3 Session - Cryogenics (Chair: Knobloch) - ARC 231/233
12:20-12:35 Discussion: Review of requirements (loads per cavity, per module, total load, pressure stability, operating temperature ...)
12:35-13:00 Some aspects of the layout and optimization for the cryogenic supply of superconducting linacs, Petersen (DESY)
13:00-14:00 Lunch (on your own)
14:00-14:10 Cryostat Design Consideration of ERL Driven Light Sources and FELs, Minehara (JAERI)
14:10-14:25 Current status of cryogenic considerations for ERLs, Knobloch (BESSY)
14:25-14:45 Discussion: Layout for an ERL, R&D Roadmap
WG3 Session - Injector Modules (Chair: Liepe) - ARC 231/233
14:45-15:00 Discussion: Requirements and differences to the main modules (Beam loading, emittance dilution, energy, reliability, redundancy to guarantee up-time ...)
15:00-15:30 Discussion: Revisit subsystems discussion in previous sessions that are impacted (cavity shape, cells, input coupler, rf power transmitter, tuners, module layout ...)
15:30-16:00 Coffee Break
16:00-16:25 Review of proposals for Cornell Injector Module, ERLP, Belomestnykh (Cornell)
16:25-16:45 R&D Roadmap
16:45-18:00 Writing of WG Reports

Wednesday, March 23, 2005
8:00-8:30 Continental Breakfast - ARC 231/233
8:30-10:30 WG3 Discussion - ARC 231/233
10:30-11:00 Coffee Break - CEBAF Center Lobby
11:00-13:00 Closing Plenary: Reports of WG1, WG2, WG3, WG4 part 1, WG4 part 2 - CEBAF Center Auditorium
13:00 Adjourn