Titles: MPCA: Multiphoton PCA walk correction ================================================== Contact: C. Kyba, Penn Revision History:- ================ 5.00 C. Kyba First version. 5.01 C. Kyba Add MC banks Titles Files ------------ mpca_data.dat Verification ------------ Description ----------- This bank contains data for applying the multiphoton PCA correction. The data is binned in non-equal width bins. The gain scaled charge is the central charge of the bin, the time (in ns) holds the offset that should be subtracted from pt0 in order to generate the multiphoton time. Bank 1 contains the correction data for data Bank 2 contains the correction data for MC with the obsolete charge dist Bank 3 contains the correction data for MC with the new charge distribution Data Words ---------- Data types: B(bit), I, F, D(double), H(hollerith 4 char) Word Type Mnemonic [symbolic command] Description ---- ---- -------- ------------------------------- 1 I KMPCA_NUM_POINTS Data points Number of data points in the file 2..5 I Spare 6..10 F Spare 11..N F There are five entries in the titles file for each data point, see the note below Notes ----- 1) The data is stored as a repeating table of floating point numbers. The first word of actual data is located at (KMPCA_STATUS_WORDS+1). Mnemonics have been set up to assist in reading the data. Assume that you are looking the i'th charge bin. The data is then stored in words: KMPCA_STATUS_WORDS+(i*5)+... +1 F KMPCA_CHARGE Bin centroid charge (pe) +2 F KMPCA_TIME MPCA time shift (ns) +3 F KMPCA_SIGMA RMS of calibration times (ns) SEE NOTE 2 BELOW +4 F KMPCA_SDOM Standard Deviation of the Mean of calibration times (ns) +5 F KMPCA_NUM_HITS Number of hit tubes in this charge bin 2) As of version 5_0082 the RMS returned by CAL is actually a fit to the data in bank 1. The MC MPCA times are smeared in order to make their first photon time spread look like the data. The RMS returned by cal is now expected to be a reasonable match to the data, although it is highly recommended that this be studied with muon data.