%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%% HISTORY OF THE GATEMASTER 1 : e+e- TRIGGER %%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% This History is the list of all the changes that can affect the trigger behaviour; so there are also the variations in the discriminator thresholds and the replacements of modules. ----RUN(S)# --|-- DATE --|------------- DESCRIPTION --------------------------- | | | | Initial e+e- trigger : | | | | e+e- = (2e)*(H2<=4)*(H1<=4)*PBG3 + 533 | 10/01/96 | | | + (1e)*(2h)*(H2=2)*(H1<=2)*(H2copl1/3) * PBG3 | | ___ | | + (2e)*(H2=2)*(H1<=2)*(H2copl1/3)*(FCH) | | ------------------------------------------------------------------------------ | | 535 | 10/01/96 | Changed CHERENKOV Thresh. from -150mV to -60mV | | ------------------------------------------------------------------------------ | | | | Changed (H1<=2) --> (H1<=4) in the branch : 688 | 10/23/96 | | | (1e)*(2h)*(H2=2)*(H1<=2)*(H2copl1/3) * PBG3 | | ----------------------------------------------------------------------------- | | | | Taken out H1 multiplicity requirements | | the trigger now is : | | | | e+e- = (2e)*(H2<=4)*PBG3 740 | 11/08/96 | | | + (1e)*(2h)*(H2=2)*(H2copl1/3)*PBG3 | | ___ | | + (2e)*(H2=2)*(H2copl1/3)*(FCH) | | ------------------------------------------------------------------------------ ********************** Christmas Shut Down *********************************** ------------------------------------------------------------------------------ | | 1005 | 01/19/96 | Taken out ~3 nsec from the H2<=4 logic | | ------------------------------------------------------------------------------ ********************** Easter Shut Down ************************************** ------------------------------------------------------------------------------ | | | | - Replaced M4 matrix (This could have some effect | | in the logics : 1h,2h,1e,2e,H1*H2'_or) 2003 | 3/09/97 | - Width of C_MLU strobe from 40nsec to 25 nsec | | - Threshold of the same strobe from -200mV to -146mV | | ------------------------------------------------------------------------------- | | 2034 | | - Changed the logic H2<=4 to H2<=5 | 3/12/97 | - H1 Thresholds (all channels) from -90mV to -30mV | | (to rise the efficiency) | | ------------------------------------------------------------------------------- | | 2075-2092 | 4/20/97 | - No FCH veto (FCAL II study) | | ------------------------------------------------------------------------------ | | | | - Changed H2 discriminator thresholds : 2143 | 3/29/97 | | | Channels : 10,16,17,24 from -90mV to -30mV | | ------------------------------------------------------------------------------ | | 2186 | 5/10/97 | - H2-17 Discriminator Threshold is back to -90mV | | ------------------------------------------------------------------------------ %%%%%%%%%%%%%%%%%%%%% LIST OF SPECIAL RUNS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% The following special runs were taken in order to study the efficiency of the Hodoscopes and of the trigger itself. ------------------------------------------------------------------------------ | | | | | | The special trigger is : | | 2034-2036 | 3/12/97 | e+e- = (2e)*(H2<=5)*PBG3 | | | | + (1e)*PBG3 | | ___ | | + (2e)*(H2=2)*(H2copl1/3)*(FCH) | | ------------------------------------------------------------------------------ | | 2037 | 4/12/97 | Data taken with M_MLU's strobe : (H2_OR).OR.(PBG_OR) | | usually is only (PBG_OR). | | ------------------------------------------------------------------------------ | | 2285-2288 | 5/31/97 | The trigger is the same as above | | ------------------------------------------------------------------------------ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% For questions or comments please contact : Wander Baldini : - wander@fnal.gov - baldini@axpfe1.fe.infn.it