H. Greif

Beam tests and calibration of the H1 liquid argon calorimeter with electrons

Results are presented on the energy calibration of the H1 liquid argon calorimeter modules with electrons from a test beam in the energy range of 3.7 GeV to 80 GeV. The method to determine the calibration for the Hl experiment from these measurements by the use of detailed simulations is described . Various systematic checks of this calibration are given. The calorimeter response is uniform in space within ±1% and linear with energy within ±1%. An average energy resolution of about 11.5%/ E [GeV] is achieved .

Electron / pion separation with the H1 LAr calorimeters

Abstract The performances of the H1 liquid argon calorimeter modules for the energy measurements and identification of electrons are studied with test data taken at CERN in the energy range 5 to 166 GeV. Various electron identification estimators exploiting global or detailed shower characteristics are studied and compared. The usage of impact position measurements is also discussed. A best combination of robust shower estimators leads typically to π-misidentification probabilities in the range 1.5 to 5.0 × 10−3 at 30 GeV for 95% electron detection efficiency. This further reduces to ∼ 10−4 for these pions to be misidentified as electrons below 25 GeV.

Results from a test of a PbCu liquid argon calorimeter

Abstract Results from a test with a lead-copper calorimeter in liquid argon are presented. The electromagnetic energy resolution obtained is 10%/√E. For hadronic showers the software weighting technique is demonstrated to work. A hadronic energy resolution of 50%/√E is found.

Performance of a PbCu liquid argon calorimeter with an iron streamer tube tail catcher

A lead-copper calorimeter in liquid argon and an iron streamer tube calorimeter acting as a tail catcher have been tested with pions in the energy range of 30–230 GeV. Results are given on the energy resolution, on sampling fluctuations and on the space resolution of the liquid argon calorimeter. For the combined system an energy resolution of σE ≈ 0.5√E is obtained applying software weighting techniques and corrections for the dead material between the two calorimeters on an event to event basis. The remaining tails in the energy distributions are discussed.

Performance of a lead-scintillator sandwich hodoscope with photodiode readout

Abstract A matrix of nine lead-scintillator sandwich shower counters with wavelength shifter and photodiode readout was operated in an electron beam up to 6 GeV. The yield was measured to be 18500–25100 photoelectrons/GeV depending on the shape of the modules. An energy resolution of σ /√ E = 0.105 was observed, the contribution from diode and amplifier noise being 29 MeV. The position resolution was determined as σ ≈ 3.0 mm for 3 GeV electrons.