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Photon Beam Stability Analysis at HyCal for Experimental Runs

This study aims to assess the stability and positioning of the photon beam during experimental operations at HyCal using EPICS data from several databases. Key devices include Beam Position Monitors (BPM) and Primex Gamma Profiler (PGP) aligned within the same reference frame. Data extraction involved analyzing runs dubbed “Gold,” “Silver,” and “Empty Target” to determine angular deviations and validate angle calculations using the law of cosines. Post-tuning, beam-trip issues were resolved, and updated beam data is made available for collaborative research.

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Photon Beam Stability Analysis at HyCal for Experimental Runs

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  1. Primex Photon Beam Stabilityat HyCal Waightstill W. Avery NC A&T July 11, 2008

  2. Purpose • Determine the photon beam positions and resulting stability during the experimental run at HyCal using EPICS data

  3. Definitions • BPM – Beam Position Monitor ( permanent hall-B BPM 2C24A ) • HyCal – Hybrid Shower Calorimeter • Pb Glass • PBWO4 crystals • PGP – Primex Gamma Profiler • All devices are assumed to be in the same frame of reference, with HyCal requiring an initial offset that was acquired from a survey • The angles ( x, y, z) are measured from their respective positive axes

  4. Process • Three databases were used for data extraction using MySQL protocols • ncat2.jlab.org/beamOrientation • primexdb.jlab.org/book_keeping • ncat3.jlab.org/test • 112 runs (used in Ilya’s0analysis), dubbed “Gold”, “Silver” and “Empty Target” runs, were used to extract EPICS datafrom these databases • For every EPICS event within individual runs the x and y-coordinates were retrieved for both the BPM and the PGP • Assuming that no magnetic field exists between the BPM and HyCal, parametric equations for a straight line trajectory were created to give the transverse coordinates on the face of HyCalrelative to the BPM and PGP

  5. Calculating Angles at HyCal • The law of cosines was used as a test to verify that our angle calculations were valid and returned a value of one for each EPICS event • Subtracting the angle from 90-degrees shows the deviation in each direction from the initial beam trajectory ’X/Y = /2 - X/Y

  6. Golden Beam Tune - Run 4349

  7. Removal of Beam-Trips

  8. Removalof Beam-Trips

  9. Summary • After the Golden Tune of the photon beam was established, beam-trips wereremoved usingJuLeia’s live time analysis • The beam position variations were well within HyCal resolution ( 1.3 mm) • The database was updated with the newly calculated x & y-coordinates of the beam at HyCal, as well as the x, y, and z angular deviations for each EPICS event for each run • The acquired information can be used to correct 0 trajectory • The updated data is available for collaboration-wide use

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