Author/Authors :
Abramov، نويسنده , , V. and Alexeev، نويسنده , , G. and Babintsev، نويسنده , , V. and Baldin، نويسنده , , B. and Butler، نويسنده , , J. and Beutel، نويسنده , , D. and Bezzubov، نويسنده , , V. and Bojko، نويسنده , , N. and Burtovoi، نويسنده , , V. P. Chekulaev، نويسنده , , S. and Chi، نويسنده , , E. and Denisov، نويسنده , , D. and Denisov، نويسنده , , S. and Diehl، نويسنده , , T. and Dodonov، نويسنده , , V. and Dyshkant، نويسنده , , A. and Ero، نويسنده ,
Abstract :
The design and main parameters of the completly redesigned DØ Forward Angle MUon System (FAMUS: 1.0<|η|<2.0) for the next high luminosity Tevatron Collider run are reported. Results of the studies of trigger scintillation counters based on fast scintillator Bicron 404A and WLS bars SOFZ-105 are presented. We report about results of test beam studies of prototype counters including minimum ionizing particles detection efficiency, time resolution and amplitude response. Radiation ageing of scintillating materials for the doses up to 1 Mrad, phototubes magnetic shielding in the fields of up to 700 G and ageing of phototubes are presented. Mini-Drift Tubes (MDTs) are chosen as FAMUS tracking detectors. The detector is a drift wire chamber with a metallic cathode. The detector operates in proportional mode with a fast freon–methane gas mixture to provide high drift velocity, adequate counting rate and low ageing. A description of the performance of the MDT is given. Studies of two prototypes in test beams were performed at FNAL and JINR. Obtained coordinate accuracy is around 0.5 mm r.m.s. All tests show robustness of MDT as tracking detector of the new muon system for a long period in high DØ background radiation conditions.
Keywords :
Tevatron Collider , Detector upgrade , Forward muon system , Trigger scintillation counters , Mini-drift tubes
