1. LLRF Functionality Stefan Simrock How to edit the title slide
Upper area: Title of your talk, max. 2 rows of the defined size (55 pt)
Lower area (subtitle): Conference/meeting/workshop, location, date, your name and affiliation, max. 4 rows of the defined size (32 pt)
Change the partner logos or add others in the last row.

2. Purpose of Catalog with LLRF Functions
Outline
Purpose of Catalog with LLRF Functions
Function Descriptions with breakdown of options
Level of Complexity
Benefits
Cost
Table of Functions
Examples of Function descriptions
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

3. Purpose of Catalog of LLRF Functions
Provides structured overview over LLRF functionality
Describes all possible functions with options
Describes when the functions and options are needed
Describes benefits of functions and individual options
Can be used to decide at which stages which functions and options are needed
Allows to estimate total cost and is used to decide on priorities.
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

4. Idea Function Option Description Phase Benefit Cost x F_01 Basic … P0
T++, O+… 3
O_01 P1 1
O_02 P3 4
F_02 6 P2 2
O_03
O_04
F_03
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

5. Phase and Level Complexity
P_0 : Commissioning ( )
Basic needs relevant for commissioning of accelerator subsystems
P_1 : Initial Operation ( )
Mainly manual operation
Applications supporting operator
P_2 : Upgrades ( )
Semi-automated operation
Advanced exception handling by operator
P_3 : Future Needs (> 2018)
Fully automated operation
Complex exception handling
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

6. Automation, Application tools for operators, A: Availability
Benefits
T: Technical
Field regulation, Robustness against parameter variations, Resonance control, Good performance close to limit.
O: Operational
Automation, Application tools for operators,
A: Availability
Redundancy, automation, …
Diagnostics
Software, hardware, performance monitors …
M: Maintainability
U: Upgradeability
(Modular Design, sufficient resources, ...)
Well understood
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

7. Cost based on function points (or use case point)
Estimate in person-month of work
Costing of basic function and all options
Includes all work from requirements to commissioning
Calibration against existing work
Some functions require other function as pre-requisite
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

8. Cavity Resonance Control Subsystem Control Subsystem Characterization
Grouping of Functions
Measurements
RF System Calibration
RF Field Control
Cavity Resonance Control
Subsystem Control
Subsystem Characterization
Exception Detection
Exception Handling
LLRF Diagnostics
RF Global Control
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

9. Vector-Sum Measurement Incident and reflected Wave Measurement
1.0 Measurements
Vector-Sum Measurement
Incident and reflected Wave Measurement
QL and Detuning
Beam Phase and Beam Current
Gamma Dose Rate
Neutron Flux
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

10. Vector-sum with single bunch Vector-sum with moderate current
2.0 RF System Calibration
Vector-sum with single bunch
Vector-sum with moderate current
Vector-sum with high current
Incident and reflected wave
Loop gain and loop phase
Gradient and phase
Gamma Dosimetry
Neutron Dosimetry
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

11. Redundant Feedforward Universal Controller Optimal Controller
3.0 Field Control
Simple Feedforward
Adaptive Feedforward
Redundant Feedforward
Universal Controller
Optimal Controller
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

12. 4.0 Cavity Resonance Control
Slow resonance control
Lorentz force compensation
Microphonics control
Wide range cavity tuning
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

13. Klystron linearization Timing control Klystron overhead management
5.0 Subsystem Control
Klystron linearization
Timing control
Klystron overhead management
Adjust incident phase
Adjust loaded Q
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

14. 6.0 Subsystem Characterization
Klystron (drive chain)
Downconverter characterization
Cavity operational limits
System identification
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

15. Signal Integrity Violation Cavity operational limit exceeded
7.0 Exception Detection
Cavity Quench
SEU Hang-up
Signal Integrity Violation
Cavity operational limit exceeded
Klystron overhead low
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

16. Recover from cavity quench Recover from SEU hangup
8.0 Exception Handling
Recover from cavity quench
Recover from SEU hangup
Adjust klystron overhead
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

17. Field regulation performance monitor Event generation Alarm generation
9.0 LLRF Diagnostic
Configuration status
Calibration status
Field regulation performance monitor
Event generation
Alarm generation
Warning generation
Fault statistics
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

18. 10.0 Accelerator Section Global Control
Momentum management
Beam energy feedback
Beam arrival time feedback
Bunch compression feedback
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

19. Example: 1.1 Vector-Sum Measurement (1)
The measured vector-sum is the necessary pre-requisite for the field stabilization. Both - feedback and feedforward algorithms - will attempt to control the measured vector-sum to the vector-sum setpoint table.
Basic
individual cavity field measurements (non-IQ)
filter and decimate signal
calibrate individual cavity fields (rotation matrix)
Calculate vector-sum
Save data in buffer (ind. Cavities and VS)
O1: save raw data at full sampling rate
B(D++,T+,W++): Useful for diagnostic purposes
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

20. Example: 1.1 Vector-Sum Measurement (2)
O2: phase drift compensation of field measurement
B(T+++): Guarantees long term field stability
O3: linearization of downconverter
B(T++): better vector-sum regulation
B(T+,O++): larger dynamic range
O4: measure level of non-linearity (gen. exception flag)
Provide warning if non-linearity error large
O5: RF Level adjustment at downconverter input
O6: Amplitude drift correction of field measurements
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

21. Example: 3.4 Universal Controller
The universal controller supports different modes of operation (SEL,GDR,VCO). It can be used for field control but supports also wide range cavity tuning, cavity/coupler conditioning etc.
Basic
Feedback and feedforward
GDR and SEL mode incl. mixture
IQ, AP and AQ control
PI controller filter
O1: VCO mode
O2: Coupler conditioning mode
O3: MIMO controller
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY

22. It will help to define the acceptance tests for LLRF deliverables.
Conclusion
The LLRF Function Catalog will be an important tool to understand the functional needs of the LLRF system
It will help to understand the trade-offs between performance and cost.
It will help to define the acceptance tests for LLRF deliverables.
I will need everyones help to fill the function catalog with live.
Dec. 15, 2008, Collaboration Meeting, Warsaw, ISE
Stefan Simrock, DESY