Tuesday April 24
18:00 - 20:00	Registration/Reception at the Jefferson Lab Residence Facility
Wednesday April 25 Room: ARC Auditorium Chair: Jean Delayen
8:00 – 8:10	Welcome/Opening Remarks	Charles Sinclair (JLAB)
8:10 – 8:30	Introduction to Workshop	Curt Hovater (JLAB)
8:30 – 9:10	TESLA RF Control System	Stefan Simrock (DESY)
9:10 – 9:30	Design and Operational Experience with the LLRF at the S-DALINAC	Markus Platz  (Darmstadt)
9:30 – 10:00	RF Control Requirements in Energy Recovery Linacs	Lia Merminga (JLAB)
10:00 – 10:15	Discussion
10:15 – 10:30	Coffee Break
10:30 – 10:50	Basic Rules for the Design of RF Control Systems in High Intensity SC Proton Linacs	M. Luong – A. Mosnier (CEA)
10:50 – 11:40	SNS LLRF Control System	Amy Regan (LANL)
11:40 – 12:00	Form Working Groups	Curt Hovater (JLAB)
12:00 – 1:30	Lunch (not provided)
1:30 – 4:00	Working Group Sessions Session 1 (ARC Auditorium):  Joint session to address WG1 charge Convener:  Alban Mosnier Secretary:  Charles Reece Contributed talk:  Lorentz Force Detuning for the SNS Cavities, Gianluigi Ciovati (JLAB) Session 2 (ARC 231-33)  Joint session to address WG3charge Convener:  Tony Rohlev Secretary:  John Musson Contributed talks:  1.  Development of Digital Controllers at NSLS, Nathan Towne (BNL) 2. Digital RF Receivers at JLAB, John Musson (JLAB) 3. Design of the LLRF of ELBE, Andree Buechner (FZ Rossendorf)
4:00 – 4:15	Coffee Break
4:15 – 5:30	Working Group Sessions 1 and 2
5:30 – 6:00	Meeting of the Rapporteurs
~6:15	Dinner at the Residence Facility Music provided by Orion
Thursday April 26 Room: ARC Auditorium Chair: Warren Funk
8:15 – 8:30	Introduction to Day 2
8:30 – 9:30	Self Excited Loop	Jean Delayen (JLAB)
9:30 – 10:00	Active Control of Lorentz Detuning and Microphonics	Matthias Liepe (DESY)
10:00 – 10:30	Voltage Controlled Reactance	Gary Zinkann (ANL)
10:30 – 10:45	Coffee Break
10:45 – 11:15	Digital Field Control:  Architecture and Implementation of Feedfordward and Feedback Techniques	Yi-Ming Wang (LANL)
11:15 – 12:00	Modern Digital Receiver Design	Chris Ziomek (ZTEC)
12:00 – 1:30	Lunch (not provided)
1:30 – 1:50	SPLinac:  Simulation of Realistic SC Linac RF Sysems with Beam	Joachim Tuckmantel (CERN)
1:50 – 2:05	Discussion
2:05 – 2:15	Organization of Working Groups
2:15 – 4:00	Working Group Sessions Session 1 (ARC Auditorium): Joint session to address WG2 charge Convener: Stefan Simrock Secretary: Kevin Beard Contributed talk: Considerations on possibility of Reactive RF Control, Ya. Derbenev (JLAB)
4:00 – 4:15	Coffee Break
4:15 - 5:30	Working Group Sessions
5:30 – 6:00	Meeting of the Rapporteurs
7:00	Dinner (not provided)
Friday April 27 Room: ARC Auditorium Chair: Curt Hovater
8:30 – 10:00	Session 1 (ARC Auditorium): Joint session to address WG1 charge Convener: Geoffrey Krafft  Secretary:  Kevin Beard Session 2 (ARC 231): LLRF issues at RIA Session 3 (ARC 233): MO Drive Lines and Mixers Conveners: John Musson and Tomasz Plawski
10:00 – 10:15	Coffee Break
10:15 – 12:30	Working Group Presentations and Discussion:
	Working Group 1 RF Parameters	Alban Mosnier (CEA)
	Working Group 2	Stefan Simrock (DESY)
	Working Group 3	Tony Rohlev (LANL)
12:30 – 1:30	Lunch (not provided)
1:30 –2:30	Open Forum	All
2:30 – 2:45	Invitation to next Workshop	Marion White (SNS/ASD)
3:00 – 4:30	Tour (SRF Facilities, CEBAF and FEL)

 
 
 

Working Groups and their Charge

Working Group 1 (WG1): Application Specific Issues and Conceptual Designs Charge of WG1:
Charge of WG1:
1.	Compile a list of applications (e.g. SNS, RIA, TESLA, ERLs) and identify top level rf parameters (e.g. Ql , pulsed or cw, beam loading, low/high beta etc.).
2.	Write rf system requirements (e.g. required amplitude, phase and resonance control) and identify differences among different applications).
3.	Compile a list of various conceptual designs (e.g. Self Excited Loop (SEL), digital/analog/combination, generator-driven I/Q, amplitude/phase, etc.).
4.	Match up control designs/solutions with different applications. Identify pros and cons for each combination of application/design.
5.	Working group recommendations for each application.

 

Working Group 2 (WG2): RF Field Control Schemes, RF System Modeling, RF System Operation
Charge of WG2:
1.	Compile a list of possible algorithms, procedures and diagnostics for each conceptual design (as identified in Charge 3 of WG1). Start with a list of questions. Examples for questions to be answered:
	a)	What are the different implementations of a SEL?
	b)	Do we need piezo tuners in a high Ql cavity, what are the advantages, are they reliable?
	c)	Feedforward (FF): when and where to implement. Issues specific to FF?
2.	How do we model an rf control system? Subsystem models for amplifiers, cavities, nonlinear effects, mechanical dynamics of the cavity, diagnostics (beam phase, detuning).
	a)	Can we make a modeling menu?
	b)	Can we develop a generic model applicable to the various schemes?
3.	Implementation (realization) of the model in a digital controller
4.	If possible compile a checklist which guides the rf system designer to the optimum design

Working Group 3 (WG3): Implementation/Design
Charge of WG3:
1.	Performance limitations of digital and analog designs
	a)	Identify pros and cons
	b)	Is analog still viable? Under what conditions?
	c)	Software vs. hardware
2.	Industry standards vs. custom design:
	a)	Identify state-of-the-art and future directions in electronic components
	b)	In-house vs. out-of-house design for digital control
3.	DSP and FPGA vs. ASIC, performance vs. cost
4.	What is the best family/chip/chip set (Altera, Xlinx, AD, TI, Intersil, Motorola etc.) for your application?
5.	Reliability, maintainability, operability of low-level rf control systems
6.	Automated operation of large-scale rf systems
7.	Integration with other subsystems
8.	Global vs. local controls
9.	Calibration of rf system parameters and commissioning issues

maintained by sthomas@jlab.org