DAPNIA-99-03 |
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Performance of the photomultiplier tubes used in the DIRC of Babar : effect of magnetic field and of helium |
P. Bourgeois, M. Karolak, G. Vasseur |
Abstract: ========= egin{abstract} This presentation summarizes the measurements performed on the ETL 9125FLB17 photomultiplier tubes, used in the particle identification device of the high energy physics BaBar experiment. In particular, we show how the performance of the phototubes is degraded by either a magnetic field or helium gas. \end{abstract} |