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Number of signals used Type of signals Tests with regular and irregular grids Last results

GRID SEARCH – last news. Roberto Venturelli University of Padova and INFN, ITIS “G.Marconi”-Verona. Number of signals used Type of signals Tests with regular and irregular grids Last results New idea for minimization function. PSA team, Orsay, June 28, 2007. Number of signals used.

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Number of signals used Type of signals Tests with regular and irregular grids Last results

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  1. GRID SEARCH – last news Roberto Venturelli University of Padova and INFN, ITIS “G.Marconi”-Verona • Number of signals used • Type of signals • Tests with regular and irregular grids • Last results • New idea for minimization function PSA team, Orsay, June 28, 2007

  2. Number of signals used Number of neighbour transients at the net charge signal assuming a simple geometrical point of view (about 10) Number of neighbours obtained from a statistics of transients when the hit occurs in the segment base (about 18) I suggest to have available all the segment signals, then every PSA code will get those significant transients with a proper mask

  3. Type of signals used:preampl. signals, MWD signals, currents, DWT coeff.,… ? preamplifier signals MWD signals current signals • Analysis done using: • preamplifier signals • MWD signals (a first electronic response correction at LLP) • + raw calculated signals

  4. MWD: how many poles needs to be corrected? • preamplifier signals • MWD signals 500ns 47ms 2nd pole 1st pole I’m NOT confident with this minimization !!! The analysis with MWD signals improves the PSA performance This format is already available at the local level processing, the calculated signals require an equivalent AA filter All the signals need to be calibrated at every fold, with a time zero reference, possibly, time shifts between channels can be managed

  5. Tests with grids: regular and irregular

  6. Tests with grids: regular and irregular Irregular Regular At the moment the best result with my method is obtained with regular grid of 2mm We have to continue the investigation to an irregular grid close to 1mm because there is something to gain ! (…limiting the processing time)

  7. Improvements in Doppler Correction CALIBRATIONS Analysis restricted to a subset of events for change of position during calibrations

  8. Improvements in Doppler Correction Internal calibration with segments Segment energy calibr. at F=2 (4.8) Not good! At low energies and with high counting rate segments energy is preferable at core energy The sum energy correction at fold 2 and more needs to be verified These tests are PSA independent The full calibration of the segments is a relevant step that has to be done before PSA Other misunderstood problems are still present in the frontal part Core energy F=1 (4.4) F=2 (4.3) F=3 (4.3) Segment energy 1st calibr. Energy shift Segment energy 2nd calibr. F=1 (4.2)

  9. Improvements in Doppler Correction Subset analyzed Internal segments calibration PSA with MWD signals First experimental results AW Last results FWHM (keV) 1381 energy (keV)

  10. Improvements in Doppler Correction Subset analyzed Segments calibration PSA with MWD signals

  11. Doppler Correction versus Z FWHM (keV) Z axis These tests could help to study the quality of the calculated signals at different z and also the capability of the PSA method to identify positions

  12. New chi2 minimization function Three different transient shapes tminA tminA tmaxA tmaxA

  13. New chi2 minimization function: S Da Dt i Measured signals Signals associated at the 1st point in the base Signals associated at the point in the base that minimizes the function S After the first tests this method gives Dc of 4.5 keV @ 1382 keV

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