First test of tiltmeters for the alignment system of CMS Berdugo, J; Burgos, C; Fernández, M.G ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/1999, Letnik:
431, Številka:
3
Journal Article
Recenzirano
In this note we present first tests done with the tiltmeters proposed as the key elements of the Laser Level systems to be used in the CMS alignment system. The response of the sensors under ...moderated longitudinal and transverse tilts is studied and intrinsic performance is extracted.
A prototype module of an iron-gas sampling calorimeter based on parallel-plate chambers, full-size depth, has been tested using high-energy muons, electrons and pions. The module was equipped with ...more than 1000 active cells read out individually. Experimental measurements at the test beam and their comparison with Monte-Carlo simulations are presented. Expected performance for a calorimeter suitable for low-angle regions in LHC experiments are derived.
We present the design of a compensating quartz fibre calorimeter, made of a unique active section, for the specific physics requirements of the small angle calorimetry for the LHC experiments.
The ...proposed calorimeter is exemplified for the case of the CMS experiment.
CMS very forward calorimeter is based on a quartz fibre technology. The calorimeter prototype composed of two longitudinal segments was tested at CERN in 1996. We present the test beam data analysis ...of this prototype. It was shown that the mean values of responses for pions and electrons of the same energy could be equalised using the appropriate ratio of calibration constants for longitudinal segments. The beam test data were used to simulate the calorimeter response to hadron jets.
A prototype module of an iron/gas calorimeter based on parallel plate chambers, has been tested using high energy electrons and pions, at two high voltages, using
CF
4
CO
2
(
80
20
) at atmospheric ...pressure. The collected charge and energy resolution have been measured as a function of the beam energy for both electrons and pions and compared with Monte Carlo predictions.
The baseline option for the very forward calorimetry in the CMS experiment is an iron/gas calorimeter based on parallel plate chambers. A small prototype module of such a calorimeter, has been tested ...using electrons of 5 to 100 GeV/
c momentum with various high voltages and two gases: CO
2 (100%) and
CF
4
CO
2
(
80
20
), at atmospheric pressure. The collected charge has been measured as a function of the high voltage and of the electron energy. The energy resolution has also been measured. Comparisons have been made with Monte-Carlo predictions. Agreement between data and simulation allows to make an estimation of the expected performance of a full size calorimeter.
We present the results of beam tests with high-energy (8–375 GeV) electrons, pions, protons and muons of a sampling calorimeter based on the detection of Cherenkov light produced by shower particles. ...The detector, a prototype for the very forward calorimeters in the CMS experiment, consists of thin quartz fibers embedded in a copper matrix. Results are given on the light yield of this device, on its energy resolution for electron and hadron detection, and on the signal uniformity and linearity. The signal generation mechanism gives this type of detector unique properties, especially for the detection of hadron showers: narrow, shallow shower profiles and extremely fast signals. These specific properties were measured in detail. The implications for measurements in the high-rate, high-radiation Large Hadron Collider (LHC) environment are discussed.
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