1 / 6

Timing and Synchronization @ NML

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

hall-robles
Download Presentation

Timing and Synchronization @ NML

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Timing and Synchronization @ NML B. Chase 7/12/07

  2. 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

  3. 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#)

  4. 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

  5. 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 RF@ 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

  6. 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

More Related