The 32nd Advanced ICFA Beam Dynamics Workshop on Energy Recovering Linacs
Program of WG3: SRF and RF Control
Sunday, March 20, 2005 | |||
8:00-8:30 | Continental 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 | ||
16:45-18:15 | FEL Tour - Leaves from CEBAF Center Lobby | ||
Monday, March 21, 2005 |
|||
8:00-8:30 | Continental 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 |
|||
8:00-8:30 | Continental 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 |