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Short Gate Sampling Mode

Short Gate Sampling Mode. Definition: BPM system samples bunches of particles that are separated from oppo-sitely charged bunches by more than 400ns. Analog filters specifications allow for this operational mode.

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Short Gate Sampling Mode

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  1. Short Gate Sampling Mode • Definition: BPM system samples bunches of particles that are separated from oppo-sitely charged bunches by more than 400ns. • Analog filters specifications allow for this operational mode. • Limitations: Only one trigger input / Echo-Tek card. Closed orbit data will be under-sampled.

  2. Single Trigger Limitation • Would like to run short gate sampling mode on pbar channels without disturbing proton closed orbit measurements. • Might be able to configure pbar channel in turn-by-turn “gated” mode. Down-convert will only process data during gate period. • Proton closed orbit measurement must handle over-clocked trigger, or must operate in short gate sample mode as well.

  3. Undersampling Limitation • Short gate sampling mode is most advantageous for pbar sampling. • We do not have the backplane bandwidth for continuous turn-by-turn sampling operation. • Closed orbit sampling will occur at the same rate as standard closed orbit sampling with a much wider digital filter bandwidth. • Betatron and synchrotron oscillations will be aliased to produce systematic “noise” on the sampled signal.

  4. Test Stand Study Plans • Establish reliable, single species, closed orbit measurements. Verify resolution and systematic variation with beam intensity and bunch patterns. • Study prospect of maintaining separate channels in Greychip running with different bandwidths. One for closed orbit and one for turn-by-turn. • Study prospect of having Greychip operating in “gated” mode and derive algorithm for compressing turn-by-turn data in Greychip. • Verify first turn and turn-by-turn acquisition with new Tev beam sync events.

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