1. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 LLRF Outline System Concept Review Requirements Personnel Engineering requirements Interfaces Alternatives Test plan Preliminary Design Review Block diagram Quality control and reliability Safety hazards

2. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 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. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Personnel Customers = Patrick Krejcik + Paul Emma need LLRF control system thru L1S by Dec 06 Hardware = Ron Akre, Jeff Olsen, Michael Cecere Software = Dayle Kotturi, Arturo Alarcon

4. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 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 OSStudy of open source real-time OS Begin RF processing of high-powered structures May 20, 2006

5. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 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

6. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Alternatives Through end of January 2005, various solutions were evaluated, from 100% COTS modules to hybrids of in-house designed boards. By May 2005, the options were narrowed down to two: an Off-the-shelf solution and an in-house solution. By August 2005, the in-house solution was selected

7. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Test Plan Will be described for the 5 categories of hardware Low level RF chassis (in-house) Monitor chassis (in-house with COTS timing) Fast control chassis (in-house with COTS timing) Slow control chassis (in-house) Feedback control chassis (COTS products)

8. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Test Plan for Low level RF chassis (in-house) What for? Low level RF distribution where EPICS is not required Where? LINAC Sector 0, the RF hut and klystron stations Status now: 119, 476, 2856, 2830.5 MHz – 16 way distributions complete. 476 MHz master amplifier complete Steps to complete: by Nov2005: PEP-II master phase shifter install and test by Dec2005: IQPAU installation and test by Jan2006: LO chassis installation and test

9. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 RF Distribution

10. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Test plan for monitor chassis – “PAD” (in-house with COTS timing) What for? Local RF phase/amplitude detection/monitoring Where? Laser, gun, L0-A, L0-B, L1-S Status now: Evaluating ADCs Steps to complete: by Dec2005: evaluation of ADCs (1chan) by Mar2006: board prototype (2 or 4 chan, thermo) by May2006: final board. Test (incl temp. cycling) by Sep2006: chassis (15 dual channel) avail. Test. by Oct2006: injector installation and test

11. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 PAD – the monitor board I RF LO Q I&Q MODULATORS 1 2 3 4 4 X 16 bit ADC (LTC2208) 119MHz Clock I RF LO Q 1 2 3 4 Chan. 2 I Chan. 1 Q Chan. 1 I Chan. 2 Q FIFO 4 X 1k words WCLK 16bit DATA WCLK 16bit DATA WCLK RF CHAN 1 INPUT RF CHAN 2 INPUT Line Drivers MONITORS EXTERNAL TRIGGER 120Hz EXTERNAL CLOCK 119MHz CS/ CLK 16 bit DATA CONTROL / Arcturus uC5282 Microcontroller Module with 10/100 Ethernet ET HERNET LO INPUT CPLD

12. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Test plan for fast control chassis (in-house with COTS timing) What for? Local RF phase/amplitude control Where? Laser, gun, L0-A, L0-B, L1-S Status now: board design Steps to complete: by Jan2006: board prototype by Mar2006: final board by Sep2006: chassis (6 single channel) by end of 2006 downtime: injector install/test

13. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 PAC – the control board

14. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Test plan for slow control chassis (in-house) What for? Phase and amplitude control of the reference Where? Sector 20 RF hut Status now: not started Steps to complete: between now and Feb 2006: determine if fast control module does the job. If yes, this is done. Otherwise: by Feb2006: start design by Mar2006: board prototype by May2006: final board by Sep2006: chassis (6 single channel) by Nov2006: injector installation and test

15. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 RF crate What for? Local feedback control and timing for RF systems Where? Sector 20 RF hut Status now: testing EVR Steps to complete: evaluate number of signals and processor load to determine number of crates design and write software test with simulation and later hardware during 2006 downtime: installation and test

16. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Feedback control crate (COTS products) What for? beam-based longitudinal feedback Where? At sector 20, in RF hut Status now: software design Steps to complete: purchase network switch module if IOC has insufficient ports by Dec2006: software by Dec2006: installation and test

17. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Block Diagram 1: Laser - Tcav

18. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Block Diagram 2: L2-L3

19. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Block Diagram 3: Total Modules

20. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Block Diagram 4: for December 2006

21. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Quality control and reliability Buy components from reliable vendors Test each component and circuit board Components will be tested in an incubator cycled from room temperature through 45 degC

22. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Safety hazards RF 1kW at 120Hz at 5uS = 0.6 Watts average, 2 Watt average amps at 2856MHz, 60W average amps at 476MHz Hazards – RF Burns Mitigation – Avoid contact with center conductor of energized connectors 110V AC Connector Require “Electrical Safety 251” completion for plugging/unplugging Hazards - Shock Mitigation - Don’t touch conductors when plugging into outlet. The LLRF system is less hazardous than a cell phone and equally hazardous as plugging in a 110V AC cord at home

23. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 Supplementary Slides… …on next page to end

24. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 476 MHz master amplifier PEP-II master phase shifter

25. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 2830.5 to 2856MHz Divide by 16 Chassis LLRF Phase Reference System

26. Dayle Kotturi System Concept Review/Preliminary Design Review dayle@slac.stanford.edu November 16, 2005 119 to 476MHz Divide by 16 Chassis LLRF Phase Reference System