A hydraulic rotating transition is used to ensure the supply of coolant to the fuel elements when the antenna system is fully rotated. One of the main actuators of the antenna liquid cooling system ...is the hydraulic rotating transition. The SolidWorks Flow Simulation software package simulates the change in hydraulic resistance in a hydraulic rotating transition in various modes of operation. The process of transferring the coolant through a hydraulic rotating transition to the antenna, with full rotation, taking into account the influence of the geometric shape of the channels on the fluid flow, was modeled. The maximum values of resistances are analyzed in different operating modes. The dependence of hydraulic resistance on the quality of surface treatment of parts is given. The value of the hydraulic resistance in different modes of operation of the hydraulic rotating transition (HRT) is less than the value allowed to ensure the circulation of the working fluid in the cooling system. Based on the data obtained, an assessment of the feasibility of using the design of a hydraulic rotating transition for an active phased antenna array of a circular view at the design stage is made.
We present here an exhaustive study of the possibilities offered by a combination of a gas radiator of the highest index of refraction commercially available
(
C
5
F
12
)
with the proven concept of ...large area CsI photocathodes instrumenting either a multiwire chamber or a GEM detector. We will present two geometries. One of them is proximity-focusing, nevertheless allows identification in a large momentum range. The second geometry deals with the possibilities of using focusing with a spherical mirror. Simulations of the performance are presented.
Aerogel Cherenkov counters for high momentum proton identification Cuautle, E.; Di Bari, D.; Gorlychev, V.G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2005, Letnik:
553, Številka:
1
Journal Article
Recenzirano
Results from ultrarelativistic heavy ion collisions at RHIC indicate that the identification of protons in a large momentum range until 10 or more GeV/
c is crucial for the understanding of the ...underlying processes that govern the production of high momentum baryons in general, and specifically the protons. We have investigated the possibilities to enlarge the present identification of protons from about 5 to
10
–
12
GeV
/
c
using aerogel counters in threshold mode. We present here the simulations for a setup with aerogel cells using one photomultiplier to collect the light emitted and the experimental results for another setup which collects the light via a wavelength shifter foil.
We present performance studies of a full-length prototype for the CASTOR quartz-tungsten sampling calorimeter, installed in the very forward region of the CMS experiment at the LHC. The response ...linearity and energy resolution, the uniformity, as well as the showers’ spatial properties in the prototype have been studied with electrons, pions and muons of various energies. A special study was also carried out for testing the light-output with a 90-degree cut of the quartz plates of the calorimeter. The data were taken during the CASTOR test beam at CERN/SPS in 2007.
The application of micro-pixel Avalanche photodiodes (MAPD) for the readout of hadron calorimeters is discussed. A prototype calorimeter was constructed consisting of individual lead/scintillator ...sandwich modules with a sampling satisfying the compensating condition. The light from each scintillator tile is captured and transported with WLS fibers embedded in the scintillator and extended to the rear end of the module. A set of 6 WLS fibers from neighboring tiles is grouped in one bundle and viewed by a 3×3
mm
2 avalanche micro-pixel photodiode. The design provides a longitudinal segmentation of the module into 10 sections with independent MAPD readout. Use of MAPDs with pixel density 10
4/mm
2 ensures good linearity of calorimeter response over a wide dynamical range. The performance of the calorimeter prototype in beam tests is reported.
The construction and performance of a modular hadron calorimeter prototype is described. The prototype consists of 9 individual lead/scintillator sandwich modules with the sampling satisfying the ...compensating condition. The light from the individual scintillator tiles is captured and transported with the WLS-fibers embedded in the scintillator and extended along the lateral side to the rear end of the module. Set of 6 WLS-fibers from the neighboring tiles is grouped in one bundle and viewed by a 3×3
mm
2 avalanche micro-pixel photodiode. The construction ensures a longitudinal segmentation of the module in 10 independent sections. The results of beam tests of the calorimeter prototype are presented. The energy resolution
σ
/
E
≈
53
%
/
E
(
GeV
)
was obtained.
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