LAr Conditions LAr ROD Test Beam Analysis Two

LAr. Conditions, LAr. ROD & Test. Beam Analysis Two Athena packages under LAr. Calorimeter : LAr. Conditions : a service to fetch information from certain database LAr. ROD : simulates the Read-Out Driver to reconstruct energy for cells Presented by Kin Yip 10 October, 2001

LAr. Conditions written by Alexander Undrus at BNL “LAr. Conditions” is a service package for getting OFC’s, pedestals etc. from the database using MYSQL (for now) At the moment, the job. Options interface looks like : LAr. Conditions. Svc. Hostname = "atlassw 1. phy. bnl. gov"; LAr. Conditions. Svc. Username = "anyuser"; LAr. Conditions. Svc. Password = ""; LAr. Conditions. Svc. OFC_config = {"OF 4_07_HIGH", "OF 4_07_MED" }; LAr. Conditions. Svc. PDS_config = {"pedestal_208881_HIGH_ped", "pedestal_208881_MED_ped"}; LAr. Conditions. Svc. RMS_config = {}; 10 October, 2001

LAr. Conditions (cont. ) At present, the requested data from the database are loaded into the memory at the initialization stage of “LAr. Conditions” Available at the moment : 4 parameters of OFC’s, the pedestal averages and RMS’ “LAr. Conditions” provides various methods to retrieve from the memory the requested information, eg. , m_sql set_gain(igain) m_sql get. OFC_a( , , tbin) m_sql get. Pedestal( , , tbin) etc. It takes some time during initialization but then very fast afterwards I have got access to the BNL database from both BNL and CERN machines successfully (though it takes longer time during initialization for the latter) 10 October, 2001

LAr. ROD FEB ROD LAr. Digit (ADC's) LAr. Raw. Channel (E, T, 2) The task is to convert ADC counts of several samples stored in the LAr. Digit to energies, times and 2’s ADCi = ADCi – pedestali Energy E = ai ADCi Time T = ( bi ADCi) / E Quality 2 = ADCi - ( gi E gi’ E T) 2 where ai, bi are the optimal filtering constants (OFC’s) and gi, gi’ are the waveforms 10 October, 2001

LAr. ROD (cont. ) … further complication The responsible algorithm in LAr. ROD dealing with Test. Beam reads the OFC’s and pedestals from a (MYSQL) database Saroj Kandasamy at BNL has filled in the database for us and she will continue to do whatever it is necessary Unfortunately, OFC available (as those used in EMTB) have NOT been converted to Ge. V One more step is needed to obtain the correct energies in Ge. V We plan to convert the OFC’s in the present database to the correct format such that the energies will be in Ge. V 10 October, 2001

Test. Beam Energy from the LAr. ROD Run 208850 (year 2000), Beam energy at 99 Ge. V, =3, =10 No cuts of run/trigger/beamchamber information have been made (partly because they are not easily available from LAr. TBCnv) I can obtain some of the information from the relevant global variables but these are NOT the ideal way to do so Applied the necessary “adc gev” factor by hand (after reading through and learning from the EMTB packages, and picking up the appropriate “ramp” values etc. ) 10 October, 2001 Energies of the particular one cell at =3, =10 (middle layer) using med. gain

Things need to be done … in my opinion LAr. TBCnv seems unable to read most of the physics runs successfully in the 2001 Test. Beam … Except run/event no. , run, trigger and beam chamber information (such as tdc/time, Random, adc_s 3) are NOT provided in the current versions of LAr. TBCnv It is necessary that we have the above-mentioned information to carry out real Test. Beam analysis On the detail side, eg. , for those “High. Med” runs (each cell appeared twice, one with high gain and one with median gain), we need to do something to select the cell with the “correct” gain for later analysis We’ll convert the available OFC’s to a format in Ge. V for our convenience in usage 10 October, 2001