No abstract available

[en] For ¹²C ⁹Be interactions at a kinetic beam energy of 3.2 GeV per nucleon, the spectra of photons at laboratory angles in the range 55^o-73^o were measured off the kinematical region available to the interaction of single nucleons within colliding nuclei. The use of a fast trigger for selecting events involving the production of high-transverse-momentum photons made it possible to measure spectra off the kinematical boundary of four-nucleon interaction. It is shown that the proposed procedure is adequate to the problem of searches for and investigation of flucton-flucton interaction. In the kinematical region where flucton-flucton interaction can manifest itself, the cross sections in question are on the same order of magnitude as respective model predictions. In order to draw definitive conclusions on the role of flucton-flucton interaction, it is highly desirable to extend the angular range of the measurements toward smaller angles.

[en] The description and preliminary results of the neutron measurements performed during the August 1998 test run on the beam line of the CMS test beam are presented. The neutron detectors, planned for use in the real CMS environment, and measured the neutron yields as a function of longitudinal and transverse coordinate have been tested. The data were taken in the negative pion beam with the energies 100 and 325 GeV. The obtained data are compared with the predictions made with MARS-96 software. The preliminary results of this comparison are also presented

[en] The experiments at the Large Hadron Collider (LHC) will have to deal with unprecedented radiation levels. In the large-rapidity regions, close to the beam pipe, these levels reach megagrays per year. The detectors to be installed in these regions, the HF Calorimeters, are designed to operate under these conditions. In this paper, we describe the results of studies in which a prototype calorimeter was exposed to radiation of the type and intensity expected at the LHC. These studies made it possible to estimate the effects of this radiation on the response and the resolution of the calorimeter as a function of time during LHC operation

[en] A calorimeter with optical quartz fibers embedded into an absorber matrix was proposed for the small angle region of the CMS detector at LHC (CERN). This type of calorimeter is expected to be radiation hard and to produce extremely fast signal. Some results from beam tests of the quartz fiber calorimeter prototype are presented. (orig.)

[en] Calorimeters based on silicon core fibres embedded into an absorber have been simulated by combining the GEANT 3.16 package and a proprietary routine describing Cherenkov photon production in optical fibres. The good agreement between simulation results and experimental data allows to study, with a high degree of confidence, the design of a prototype hadronic detector and of different calorimeter configurations to cover the very forward regions of an LHC experiment. ((orig.))

[en] A small quartz fiber calorimeter prototype with copper absorber has been assembled and tested at ITEP as a first test of a ''0 degree'' component of the RD-40 R and D program. Calibration and monitoring of each tower response was performed using the positions of single photoelectron peaks as well as the response to minimum ionizing particles incident at an angle of 45 . The response of the prototype to 4 GeV electrons as a function of beam angle with respect to the quartz fibers was studied in the range from 0 to 90 . The test results are compared to the GEANT based Monte Carlo (MC) simulations. (orig.)

[en] Results on the light output of different kinds of silica fibres and on energy resolution and electromagnetic shower dimensions in small lead/quartz fibres calorimeter prototypes are presented, together with a possible design of a very forward calorimeter for LHC. ((orig.))

[en] Extensive measurements have been made with pions, electrons and muons on four production wedges of the compact muon solenoid (CMS) hadron barrel (HB) calorimeter in the H2 beam line at CERN with particle momenta varying from 20 to 300 GeV/c. The time structure of the events was measured with the full chain of preproduction front-end electronics running at 34 MHz. Moving-wire radioactive source data were also collected for all scintillator layers in the HB. The energy dependent time slewing effect was measured and tuned for optimal performance. (orig.)

[en] The DOe detector is used to study pp-bar collisions at the 1800 and 630 GeV center-of-mass energies available at the Fermilab Tevatron. To measure jets, the detector uses a sampling calorimeter composed of uranium and liquid argon as the passive and active media, respectively. Understanding the jet energy calibration is not only crucial for precision tests of QCD, but also for the measurement of particle masses and the determination of physics backgrounds associated with new phenomena. This paper describes the energy calibration of jets observed with the DOe detector at the two pp-bar center-of-mass energies in the transverse energy and pseudorapidity range E_T>8 GeV and vertical bar η vertical bar <3