Author/Authors :
Andreev، نويسنده , , V and Boudry، نويسنده , , V and Fomenko، نويسنده , , L. and Gogitidze، نويسنده , , N and Levonian، نويسنده , , S and Moreau، نويسنده , , V. and Sheviakov، نويسنده , , I and Smirnov، نويسنده , , P and Soloviev، نويسنده , , Yu and Specka، نويسنده , , A and Usik، نويسنده , , A، نويسنده ,
Abstract :
At HERA, luminosity is determined on-line and bunch by bunch by measuring the bremsstrahlung spectrum from e–p collisions. The H1 collaboration has built a completely new luminosity system in order to sustain the harsh running conditions after the four-fold luminosity increase. Namely, the higher synchrotron radiation doses and the increased event pile-up have governed the design of the two major components, a radiation-resistant quartz-fiber electro-magnetic calorimeter, and a fast readout electronics with on-line energy histogramming at a rate of 500 kHz. An overview of the different components of the new luminosity system is given, and the commissioning status is reported.
Keywords :
Collider , Bethe-Heitler , Luminosity measurement , Bremsstrahlung , Radiation resistances , Cherenkov-Fiber Calorimetry , Event pile-up
