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LCLS Timing

LCLS Timing. Outline Scope The order of things Introducing the PNET VME receiver Status of the PNET VME receiver System diagram Looking at timing pulse to pulse LCLS MPG EVG Conclusions. Scope.

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LCLS Timing

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  1. LCLS Timing • Outline • Scope • The order of things • Introducing the PNET VME receiver • Status of the PNET VME receiver • System diagram • Looking at timing pulse to pulse • LCLS MPG • EVG • Conclusions

  2. Scope • LCLS timing system is used to transmit a fiducial 360 Hz signal to all triggered devices in LCLS • System requirements (speed and content) are known: receive 128 bit PNET data at 360 Hz; append add’l info; operate at 120 Hz • The component parts are known: PNET VME receiver, EVG-200 and EVR-200 • The interfaces are being defined

  3. The order of things • The one and only SLC Master Pattern Generator (MPG) • Takes as input: 360 Hz fiducial from SLC PDU is the signal to create a new PNET buffer • Performs tasks: • creates PNET buffers • responds to faults • Outputs PNET buffers to all micros and PNET VME receiveron the next 1/360 s fiducial

  4. Introducing the PNET VME receiver N

  5. Status of the VME PNET receiver • Hardware prototype is finished (1 instance) • Board is 3 slots wide to accommodate on board cable modem interface to PNET • Engineering Design Specification doc written • Driver and device support (bi, mbbiDirect to access each variable in PNETbuffer) written. Compiled only for Synergy PPC running RTEMS 4.6.2

  6. System Diagram

  7. Looking at timing pulse to pulse

  8. Looking at timing pulse to pulse

  9. Looking at timing pulse to pulse

  10. LCLS MPG • Takes the PNETbuffer with appended epicsTimeStamp and checksum fault indicators • Adds on LCLS application commands • Adds on any newly detected faults • Informs EVG that data is ready

  11. EVG • On board FPGA packages/chunks 24 byte LCLS MPG data and sends to EVR at 125 MHz • Data arrives in EVR in 0.6 microseconds + fiber travel time (which depends on distance)

  12. Conclusions • LCLS MPG needs to be designed • LCLS MPG/EVG interface needs defining • EVR/SLC-aware IOC interface needs defining • Performance and reliability from PNET through to EVG must be measured • But I guess there has been some progress…

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