Abstract
The HPC, electromagnetic calorimeter for the LEP Delphi experiment is a TPC-like detector working in B field. Its response depends much on charge transmission to the reading plane, which requires a good alignment between E d and B fields, and on drift velocity. To align E d and B fields and to monitor charge transmission, the signal of α particles, emitted by a source in a dr channel near the HT-plane, will be measured. Some HPC modules will be equipped with a P-I-N photodiode, faced to the source, in order to trigger α particles so to monitor drift velocity. Tests in a drift channel simulating HPC were performed and gave good results for this monitoring method also for what drift velocity is concerned.
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