Author/Authors :
Apollonio، نويسنده , , M. and Barber، نويسنده , , G. and Bell، نويسنده , , K.W. and Britton، نويسنده , , D. and Brooke، نويسنده , , J. and Brown، نويسنده , , R.M. and Bourotte، نويسنده , , J. and Camanzi، نويسنده , , B. and Cockerill، نويسنده , , D.J.A. and Davies، نويسنده , , G. and Devitsin، نويسنده , , E. and Ergun، نويسنده , , G. and Gninenko، نويسنده , , S. V. Golubev، نويسنده , , N. and Goussev، نويسنده , , Y. and Haguenauer، نويسنده ,
Abstract :
The performance of prototype vacuum phototriodes is presented from the first full sized supercrystal array for the CMS ECAL endcaps. The array was exposed to high-energy electrons and tested in magnetic fields of up to 3 T, in the CERN North area, in July and August 1999. The mean VPT electron yield, normalised to a naked crystal light yield of 8 photoelectrons/MeV into an HPMT, was found to be 25 electrons/MeV at 3 T for devices from Research Institute Electron, 35 electrons/MeV for devices from Hamamatsu and 18/23 electrons/MeV from Electron Tubes.
