Author/Authors :
Apollonio، نويسنده , , M and Barber، نويسنده , , G and Bell، نويسنده , , K and Britton، نويسنده , , D and Brooke، نويسنده , , J and Brown، نويسنده , , R and Bourotte، نويسنده , , J and Camanzi، نويسنده , , B and Cockerill، نويسنده , , D and Davies، نويسنده , , G and Devitsin، نويسنده , , E and Gninenko، نويسنده , , S and Golubev، نويسنده , , N and Goussev، نويسنده , , Y and Grafstrِm، نويسنده , , P and Haguenauer، نويسنده , , M and Head، نويسنده , , R and، نويسنده ,
Abstract :
Tests of a prototype for the electromagnetic calorimeter (ECAL) of the compact muon solenoid experiment (CMS) at the large hadron collider are described. The basic unit for the endcap ECAL in CMS is a “supercrystal” of 25 lead tungstate crystals. Results are presented from tests of the first full-sized supercrystal in electron beams and in a 3 T magnetic field. The supercrystal was exposed to electron beams with energies from 25 to 180 GeV. An energy resolution (σE/E) of (0.48±0.01)% was measured at 180 GeV.
