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HCAL 137 Cs calibration R. Dzhelyadin, Yu. Guz, IHEP, Protvino

HCAL 137 Cs calibration R. Dzhelyadin, Yu. Guz, IHEP, Protvino. HCAL 137 Cs calibration. Source installation: 18/07/2008 Run1 + dose measurements: 21/07/2008. Run2: 25/07/2008: preliminary Run3: 02/08/2008: calibration runs (5 passages each side)

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HCAL 137 Cs calibration R. Dzhelyadin, Yu. Guz, IHEP, Protvino

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  1. HCAL 137Cs calibration R. Dzhelyadin, Yu. Guz, IHEP, Protvino Yu. Guz 27/08/2008

  2. HCAL 137Cs calibration • Source installation: 18/07/2008 • Run1 + dose measurements: 21/07/2008 • Run2: 25/07/2008: preliminary • Run3: 02/08/2008: calibration runs (5 passages each side) • Run4: 11/08/2008: verification I (2 passages each side) • Run5: 27/08/2008: verification II foreseen for tonight Yu. Guz 27/08/2008

  3. 137Cs calibration: procedure Dedicated control PC for each side Source speed: side A 30 cm/s , side C 25 cm/s (adjustable) Duration of one source passage (2x700 m, back and forth): side A ~1h20’, side C ~1h35’ Data rate: ~650 meas./sec, or ~1.5 ms between measurements (16, 40 or 36 cells); total of ~0.25 GB of data per passage We use data produced at the return of the source. The results (tile responses and other fit parameters) are stored as ascii files for further analysis Yu. Guz 27/08/2008

  4. HCAL calibration: Run3 Performed on Aug 02-03. 10 source passages (5 each side): • at integrator range 1 (~1500 nA):gains (by “Anatoly” calibration + “ECAL” CW function) of 200k, 100k and 50k • at integrator range 0 (~300 nA) : gains of 50k and 25k Yu. Guz 27/08/2008

  5. HCAL 137Cs Run3: calibration 5 source passages at different HV The effective regulation curves were extracted from the 137Cs data ICs – current in the cell ACs=300(330)MBq for side C (A) Cclip=3 Ph=100 ph.el./GeV KCs= 41.07 (nA/mCi)/(pC/GeV) (from test beam) e=1.6·10-19 C – electron charge Then, the sensitivity to hadrons: NB The source activities are known to ~30%, so the overall calibration constants (one per HCAL side) should be determined from other considerations Yu. Guz 27/08/2008

  6. HCAL Cs: verification Yet another 137Cs run was performed 11/08 in order to verify the calibration results. At the moment of the run, the HV were calculated wrongly (~40..50 V lower). The results are therefore presented with a correction for this: ICs * (nominal gain)/(actual gain) Better than 1% RMS. 100k 50k Yu. Guz 27/08/2008

  7. HCAL Cs: update The calibration is made “official” and placed into the CALO database. The CW function for HCAL is updated (also for ECAL) PVSSCaloDb update: the new library version will be available tomorrow. New function added to obtain COSMIC HV settings for xCAL (x = H or E) (equal gain), which uses default PM calibration and CW function: int nc=xCALDACCforGain(float gain, dyn_char type, dyn_int x, dyn_int y, dyn_int iDAC, dyn_int DACC, string errMess); gain – desired gaintype, x, y – list of cells; if empty then whole xCAL returnediDAC – list of DAC addresses (box*1000 + iout) DACC – list of corresponding DAC codeserrMess – error message Yu. Guz 27/08/2008

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