1. LLRF Controls Outline Requirements External Interfaces Schedule Design
Date Needed
Prototype Completion Date
Hardware Order Date
Installation
Test Period
Design
Design Maturity (what reviews have been had)
State of Wiring Information
State of Prototype

2. Requirements At 120 Hz, meet phase/amp noise levels defined as:
0.1% rms amplitude
100 fs rms in S-band (fill time = 850 ns)
125 fs rms in X-band (fill time = 100 ns)
All tolerances are rms levels and the voltage and phase tolerances per klystron for L2 and L3 are Nk larger, assuming uncorrelated errors, where Nk is the number of klystrons per linac (L2 has 28; L3 has 48)

3. Engineering Requirements
When beam is present, control will be done by beam-based longitudinal feedback (except for T- cavs); when beam is absent, control will be done by local phase and amplitude controller (PAC)
Adhere to LCLS Controls Group standards: RTEMS, EPICS, Channel Access protocol
Ref: Why RTEMS? Study of open source real-time OS
Begin RF processing of high-powered structures May 20, 2006

4. External Interfaces LLRF to LCLS global control system
PVs available for edm screens, archiving, etc over controls network
LLRF VME to beam-based longitudinal feedback
from feedback: phase and amplitude corrections at 120 Hz over private ethernet
from LLRF: phase and amplitude values
(internal) LLRF VME to LLRF microcontrollers
from VME: triggers, corrected phase and amplitude
from microcontrollers: phase and amplitude averaged values at 120 Hz, raw phase and amplitude values for debug

5. External Interfaces: Laser - Tcav

6. External Interfaces: L2-L3

7. Schedule – for PAD Date Needed: injector: Dec/06
Prototype Completion Date:
Mar/06: board prototype (2 or 4 chan, thermo)
May/06: final board. Test (incl temp. cycling)
Hardware Order Date: continuous
Hardware Delivery Date:
by Sep/06: chassis (15 dual channel) avail.
Installation: injector: Oct/06
Test Period: injector: Nov/06

8. Schedule – for PAC Date Needed: injector: Dec/06
Prototype Completion Date:
Jan/06: first board prototype
Mar/06: first board prototype if not same as fast PAC
Hardware Order Date: continuous
Hardware Delivery Date:
by Sep/06: chassis (6 single channel)
Installation: injector: Nov/06
Test Period: injector: Nov/06

9. Schedule – for slow PAC Date Needed: injector: Dec/06
Prototype Completion Date:
Mar/06: first board prototype if different than fast PAC
Hardware Order Date: continuous
Hardware Delivery Date:
by Sep/06: chassis (6 single channel)
Installation: injector: Nov/06
Test Period: injector: Nov/06

10. Schedule – for timing/feedback crate
Date Needed: injector: Dec/06
Prototype Completion Date: Fall/06
Hardware Order Date: done
Hardware Delivery Date: have it
Installation: injector: Nov/06
Test Period: injector: Nov/06

11. Design
Design maturity (what reviews have been had):
RF/Timing Design, DOE Review, August 11, 2004
Akre_FAC_Oct04_RF_Timing, FAC Review, October, 2004
Low Level RF Controls Design, LCLS Week, January 25-27, 2005
Low Level RF, Lehman Review, May 10-12, 2005
LLRF Plans for Development and Testing of Controls, LCLS Week, July 21, 2005
Low Level RF Design, Presentation for Controls Group, Sept. 13, 2005
LLRF Preliminary Design review, SLAC, September 26, 2005
LCLS LLRF Control System - Kotturi, LLRF Workshop, CERN, October 10-13, 2005
LCLS LLRF System - Hong, LLRF Workshop, CERN, October 10-13, 2005
LLRF and Beam-based Longitudinal Feedback Readiness - Kotturi/Akre, LCLS Week, SLAC, October 24-26, 2005
LCLS Week LLRF and feedback - Kotturi/Allison, LCLS Week, SLAC, October 24-26, 2005
LLRF, LCLS System Concept Review/Preliminary Design Review, SLAC, November 16-17, 2005 Comments
LLRF Beam Phase Cavity Preliminary Design review, SLAC, November 30, 2005
Docs at:
State of wiring: percent complete Captar input will be given at time of presentation
State of prototype: PAD (1 chan ADC) and PAC boards built (shown on next pages).Testing.

12. PAD – the monitor board

13. PAD – the monitor board – fix for only 2 chan

14. PAC – the control board

15. PAC – the control board

16. Additional Slides
The following two pages show an overview of the LLRF control modules. From these diagrams, counts of module types, as well as function and location are seen.

17. Overview of LLRF at Sector 20

18. Overview of LLRF at Sector 24