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Purpose : eliminating beam trips from DAQ data .

Purpose : eliminating beam trips from DAQ data . What are beam trips? Why must they be eliminated? How can they be eliminated? Must know what Livetime is in order to answer questions. Livetime ?. What is Livetime ? How is it determined?

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Purpose : eliminating beam trips from DAQ data .

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  1. Purpose: eliminating beam trips from DAQ data. • What are beam trips? • Why must they be eliminated? • How can they be eliminated? • Must know what Livetime is in order to answer questions.

  2. Livetime? • What is Livetime? • How is it determined? • Livetime is the period of time that data can be acuired in the experiment. • It is determined using two scalers, both are guided by a clock. • One is free running, the other is DAQ live-time gated. • Free running scaler – Live1. • The live-time gated scaler – Live2.

  3. Method Used • Used data from Primex DB database • Ratio of Live1 and Live2 from 1st db gives livetime for each event. Used distributions of • Live1/Live2=Livetime • Stop – Start for each interval in the fit to determine beam trip criteria

  4. Stop – start trip feature

  5. LIVETIME TRIP FEATURE • When the intensity of the beam drops the live-time rises. • When the live time drops the beam intensity rises.

  6. 1D DISTRIBUTIONS • This is an example of fractional livetime distribution • This is an example of difference of stop event start event distribution

  7. FITS • Guass fit for Livetime. • Guass fit for Stop/Start Difference.

  8. BEFORE – AFTER COMPARISON • Trips occurring • No trips

  9. TIME STABILITY OF LIVETIME

  10. Summary • Study helped determine • the correct beam position • at HyCal • Shows sensitivity to • beam intensity changes

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