The EHS lead-glass calorimeters and their laser based monitoring system

Cerenkov counters

“…The energy resolution of a lead-glass counter will depend on the amount of shower leakage out of the block and on the photoelectron statistics. The energy resolution varies with energy according to the relation Two lead-glass arrays were used as photon detectors at the European Hybrid Spectrometer at CERN [12]. One photon detector was designed to simultaneously measure the position and energy of an electromagnetic shower.…”

Search for heavy neutrino in $$K^{+} \rightarrow \mu ^{+} \nu _{H}$$ K + → μ + ν H decay

“…The 11 m long Decay Volume (DV) filled with helium contains 11 rings of guard system (GS), which consists of 670 Lead-Scintillator sandwiches (20 layers of 1.5 mm: 5 mm each) with WLS readout grouped in 300 ADC channels. To supplement GS, a gamma detector (BGD, made of ∼ 1050 5 × 5 × 42 cm 3 lead glass blocks [19]), located behind the DV is used as a veto at large angles, while low angle particles pass through a central opening. The wide aperture 200 × 140 cm 2 magnet SM (S P40 A) , with a field integral of ∼ 1 Tm deflects charged particles in horizontal plane and serves as a spectrometer together with corresponding tracking chambers: 5k channels of 2 mm pitch PC's (PC 1,...,8 ), 1k channels of 9 mm diameter straw tubes ST (1,2,3) and 300 channels of 40 mm diameter drift tubes DT 1,2 .…”