Linac Coherent Light Source (LCLS)
This presentation is the property of its rightful owner.
Sponsored Links
1 / 14

Linac Coherent Light Source (LCLS) Low Level RF System New RF System Commissioning Experience April 16, 2007 PowerPoint PPT Presentation


  • 155 Views
  • Uploaded on
  • Presentation posted in: General

Linac Coherent Light Source (LCLS) Low Level RF System New RF System Commissioning Experience April 16, 2007. Safety. Hazards in the LLRF system RF 1kW at 120Hz at 5uS = 0.6 Watts average, 2 Watt average amps at 2856MHz, 60W average amps at 476MHz Hazards – RF Burns

Download Presentation

Linac Coherent Light Source (LCLS) Low Level RF System New RF System Commissioning Experience April 16, 2007

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Linac coherent light source lcls low level rf system new rf system commissioning experience april 16 2007

Linac Coherent Light Source (LCLS) Low Level RF SystemNew RF System Commissioning ExperienceApril 16, 2007


Safety

Safety

  • Hazards in the LLRF system

    • 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. All employees working with LLRF systems are required to have the proper training.

    • 110VAC Connector

      • Hazards - Shock

      • Mitigation - Don’t touch conductors when plugging into outlet.

      • All chassis are inspected by UL trained inspector (EEIP).


Lcls layout

LCLS Layout

P. Emma


Scope of work for injector turn on 1

Scope of Work for Injector Turn-on 1

  • Linac Sector 0 RF Upgrade

    • All 3 RF Chassis completed and Installed

    • Control Module (IQPAU) needs modifications

  • Sector 20 RF distribution system -

    • Phase and Amplitude Controllers (PAC) - Operational

    • Phase and Amplitude Detectors (PAD) - Operational

    • Phased Locked Oscillator – Use SPPS unit for Turn On

    • LO Generator - Operational

    • Multiplier – 476MHz to 2856MHz - Operational

    • 4 distribution chassis - Operational

    • Laser Phase Measurement – Needs some signal processing

    • X-Band Reference – Chassis built, require testing and installation

  • LLRF Control and Monitor System

    • 1 kW Solid State S-Band Amplifiers – 5 units

    • PADs – 6 Klystron units in Fabrication

    • PADs – Gun, L0A, L0B, L1S – Operational : Tcav, L1X in test

    • PACs – Gun, L0A, L0B, L1S –Operational : TCav, L1X in test

  • Beam Phase Cavity

    • PAD in test

    • Pill box cavity with 2 probes and 4 tuners – Complete


Scope of work for injector turn on 2

Scope of Work for Injector Turn-on 2

  • LLRF VME control system

    • Local feedback loops on RF phase and amplitude

      • RF Gun Cell loop tested in lab at 360 Hz and in operation at 10 Hz

      • L1-S loop tested in lab at 360 Hz and in operation at 30 Hz

      • L0-A and L0-B loops tested in lab at 100 Hz

    • Gun Tune temperature loop testing in progress

    • Event system and timing triggers configured for accelerate and standby

  • External interfaces

    • Beam-synchronous acquisition

    • LEM, SCP Correlation plots

    • Channel Archiver – active for all installed channels

    • Alarm Handler – initial layout done by J. Rock. Alarm limits TBD

    • Global beam-based longitudinal feedback on L0-B and L1-S - untested


Slac linac rf new control

SLAC Linac RF – New Control

The new control system will tie in to the IPA Chassis with 1kW of drive power available. Reference will be from the existing phase reference line or the injector new RF reference

I and Q will be controlled with a 16bit DAC running at 102MHz. Waveforms to the DAC will be set in an FPGA through a microcontroller running EPICS on RTEMS.

Existing System


Processing rf stations

Processing RF Stations

Gun – About 1 Week to Full Power

L0A – About 2 Weeks to Full Power

Most stations were and still are gassy by the klystron.


Processing rf stations1

Processing RF Stations

L0B – About 2 weeks to Full Power

L1S – Easy 1 Week to Full Power


Gun high power rf pulse shaped by pac l0a and l0b look similar

Gun High Power RF Pulse Shaped by PACL0A and L0B look similar

Amplitude Waveform flat to +-2% Phase Waveform flat to +-2 Degrees

Pulse width of 1.2uS and >600nS of waveguide eliminates klystron power change due to reflected power and need for circulator.


L1s high power rf sled pulse shaped by pac

L1S High Power RF SLED Pulse Shaped by PAC

SLED Amplitude Waveform

Phase Waveform flat to +-2 Degrees

Over fill time of structure


Operational units

Operational Units

  • S-Band Reference System

  • Laser SPAC

  • Gun PAC

  • L0-A PAC

  • L0-B PAC

  • L1-S PAC


Pads ready for commissioning

PADs – Ready for Commissioning


Injector l1 units remaining to commission

Injector/L1 Units Remaining to Commission

  • TCav PAC

  • Gun (done 4/12/07), L0-A, L0-B, L1-S, TCav PADs

  • Klystron PADs

  • Sector 0 IQPAU

  • X-Band System

  • VME based Feedbacks (Gun Cell Done)

  • Diagnostic data analysis


To follow

To Follow

  • PAC software – more analysis in FPGA

  • PAD software – evaluate speed

  • Second network – to send waveforms out while running

  • Switch to final network configuration putting embedded IOCs on private network

  • Switch access to waveforms to use CA gateway

  • VME – quantify CPU usage as each station is added


  • Login