timing and synchronization @ nml
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Timing and Synchronization @ NML. B. Chase 7/12/07. Time Standards. There are two natural time metrics at NML NIST time which we can receive via GPS RF time based on the 1300 MHz Master Oscillator and a “start trigger” There is one “unnatural” time-base Power line based 60 Hz

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Presentation Transcript
time standards
Time Standards
  • There are two natural time metrics at NML
    • NIST time which we can receive via GPS
    • RF time based on the 1300 MHz Master Oscillator and a “start trigger”
  • There is one “unnatural” time-base
    • Power line based 60 Hz
      • Power line synchronization is needed to alias out line harmonics in accelerator systems by beam
      • Variability in power line frequency breaks the NIST and RF relationship
suggested time metrics
Suggested Time Metrics
  • GPS time for non beam related sampling
    • As good as 10ns accuracy and max resolution for SOME systems. As bad as 10 us for others
    • Record the time for each start trigger (T0)
  • RF time-base for the RF cycle
    • Sub 100 fs accuracy and resolution
    • This can be translated to seconds for non beam information (ie RF waveforms)
    • For beam data the bunch number is used as an index
  • Time, RF cycle# (event + delay), RF cycle#(bunch#)
data correlation
Data Correlation
  • Requirements
    • An accurate meter stick clock lattice
    • A time stamp model that supports the clock lattice (hardware and software)
    • Analysis software that supports the multiple time base issue and will also support the multiple clock rates used in data acquisition
clock source synchronization
Clock Source Synchronization
  • Various clocks used for DAQ and control must be aligned at T0 (start of RF process) synchronous with 60 Hz
    • Master Oscillator [email protected] 1300MHz,, Laser @ 81.25MHz, Controls clk @ 9.027778MHz, beam @ 81.25/n MHz, other?
    • The LLRF LO @ 1313MHz will probably not be synchronized, LLRF clock @ LO/21
sources of clean rf
Sources of Clean RF
  • Master Oscillator
    • Main source but is only at one location
  • RF Reference line
    • Mostly for LLRF
    • Very limited use for VERY good reasons
  • Local Oscillator
    • Mostly for LLRF
    • Others can use for good reasons
  • Control clock (9.02777MHz)
    • Can be used with PLL or as is
    • Guessing much higher jitter
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