EFFICIENCY PROFILE METHOD TO STUDY THE HIT EFFICIENCY OF DRIFT CHAMBERS

NIKHEF, AmsterdamA method based on the usage of efˇciency proˇle is proposed to estimate the hit efˇciency of driftchambers with a large number of channels. The performance of the method under real conditions of thedetector operation has been tested analysing the experimental data from the HERA-B drift chambers.„²O µI¥´±¨ OEE¥±E¨¢´µ¸E¨ ¸· i EO¢ ´¨° OI¥¥± ¤·¥°Eµ¢OI ± ³¥· ¸ iµ²OI¨³ ±µ²¨I¥¸E¢µ³± ´ ²µ¢ ¶·¥¤²µ¦¥´ ³¥Eµ¤, µ¸´µ¢ ´´O° ´ ¨¸¶µ²O§µ¢ ´¨¨ ¶·µE¨²O´µ° EE´±I¨¨ OEE¥±E¨¢´µ¸E¨.·¨³¥´¨³µ¸EO ³¥Eµ¤ ¢ ·¥ ²O´OI E¸²µ¢¨OI · iµEO ¤ ¥E¥±Eµ· ¶·µ¢¥·¥´ ´ ¶·¨³¥·¥ ´ ²¨§ O±¸-¶¥·¨³¥´E ²O´OI ¤ ´´OI ¸ ¤·e°Eµ¢OI ± ³¥· E¸E ´µ¢±¨ HERA-B.