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LLRF and Beam-based Longitudinal Feedback Readiness

LLRF and Beam-based Longitudinal Feedback Readiness. Outline Overview of the system December 2006 readiness requirements Dependencies Activities to get there – past/present/future Conclusion. Overview of the system.

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LLRF and Beam-based Longitudinal Feedback Readiness

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  1. LLRF and Beam-based Longitudinal Feedback Readiness • Outline • Overview of the system • December 2006 readiness requirements • Dependencies • Activities to get there – past/present/future • Conclusion

  2. Overview of the system • The low level RF controls system consists of RF phase and amplitude controls at these locations: • Laser • Gun (Klystron 20-6) • L0-A, a.k.a. L0-1 (Klystron 20-7) • L0-B, a.k.a. L0-2 (Klystron 20-8) • L0 Transverse cavity (Klystron 20-5) • L1-S (Klystron 21-1) • L1-X (Klystron 21-2) • L2 - (Klystrons 24-1,24-2,24-3) to control avg phase/ampl of L2 • L3 Transverse cavity (Klystron 24-8) • L3 - 2 sectors of klystrons, S29+S30 • The feedback system consists of a VME chassis connected to LLRF IOCs via private ethernet

  3. Dec 2006 readiness requirements • RF phase and amplitude controls at these locations: • Laser • Gun (Klystron 20-6) • L0-A, a.k.a. L0-1 (Klystron 20-7) • L0-B, a.k.a. L0-2 (Klystron 20-8) • L0 Transverse cavity (Klystron 20-5) • L1-S (Klystron 21-1) • Longitudinal beam-based feedback controls as far as BC1

  4. Dependencies • Use of current downtime to proceed with installation at LINAC Sector 0 • RF hut readiness with racks, AC power, cables and water by July2006 (downtime)

  5. Activities to get therepast/present/future • Five 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)

  6. 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 • Steps to complete: • by Oct2005: PEP-II master phase shifter • by Nov2005: IQPAU • by Nov2005: 476 MHz master amplifier • by Jan2006: LO chassis

  7. RF Distribution

  8. 476 MHz master amplifier PEP-II master phase shifter

  9. LLRF Phase Reference System 2830.5 to 2856MHz Divide by 16 Chassis

  10. LLRF Phase Reference System 119 to 476MHz Divide by 16 Chassis

  11. Monitor chassis (in-house with COTS timing) • What for? Local RF phase/amplitude 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 (4 chan, thermo) • by May2006: final board • by Sep2006: chassis (15 dual channel) • by Oct2006: injector install

  12. 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

  13. 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: • by Feb2006: start design • by Mar2006: board prototype • by May2006: final board • by Sep2006: chassis (6 single channel) • by Nov2006: injector install

  14. 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: install

  15. 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

  16. Conclusion • The low level RF system and the global feedback system will be ready for commissioning by December 2006, based on the plan presented.

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