Encontrados 4 documentos, a visualizar página 1 de 1
Electroluminescence yield in xenon gas detectors
C.M.B. Monteiro; L.M.P. Fernandes; J.A.M. Lopes; L.C.C. Coelho; J.F.C.A. Veloso; J.M.F.dos Santos; K. Giboni; E. AprileThe electroluminescence yield was studied for xenon gas as a function of the electric field in the scintillationregion, for room temperature using a gas proportional scintillation counter. A large area avalanche photodiode was used for the readout of the VUV secondary scintillation produced in the gas, together with the 5.9-keV x-rays directly absorbed in the photodiode. Using the latter as a reference for the ...
Operation of MHSP multipliers in high pressure noble-gas
F.D. Amaro; J.F.C.A. Veloso; A. Breskin; R. Chechik; J.M.F. dos SantosWe report on the performance of a Micro-Hole & Strip Plate (MHSP) electron multiplier operating in pure Xe, Kr, Ar and Ne at the pressure range of 1 to 6 bar and in Ar – Xe mixtures at pressures ranging from 1 to 7 bar. Themaximal gains at 1 bar Xe and Kr are 5*104 and 105, respectively; they drop by about one order of magnitude at 2bar and by almost another order of magnitude at 5-6 bar; they reach g...
X-ray and UV imaging with multi-GEM/MHSP gaseous detectors
J.M. Maia; A. Breskin; R. Chechik; J.F.C.A. Veloso; J.M.F. dos SantosWe present the recent results regarding the application of cascades of GEMs and a MHSP in the detection and imaging of X-rays and UV-photons. The imaging system tested consisted in a micropattern gas detector based in multi-GEM or multi-GEM/MHSP electron multipliers, a 20´20 mm2 Wedge & Strip (W&S) readout electrode with 1.6 mm pitch positioned below and at close distance of a resistive electrode,...
Photoelectron collection efficiency at high pressure for a gamma detector envis...
C.D.R. Azevedo; C.A.B. Oliveira; J.M.F. dos Santos; J.F.C.A. VelosoRecent developments on gas avalanche detectors based on microstructures operating at high pressure allow fair detection efficiency for hard X- and gamma-rays. A hybrid system combining an assisted scintillation in a highpressure xenon gas medium and two UV photosensors based on microstructures operating face to face, having the xenon medium sandwiched between, is under investigation for imaging purposes. To eva...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||