7 documents found, page 1 of 1
Reflectance and fluorescence characteristics of PTFE coated with TPB at visible...
Haefner, J.; Fahs, A.; Ho, J.; Stanford, C.; Guenette, R.; Adams, C.; Almazán, H.; Álvarez, V.; Aparicio, B.; Aranburu, A.I.; Arazi, L.; Arnquist, I.J.Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200 nm, 260 nm, and 450 nm. Th...
A compact dication source for Ba2+ tagging and heavy metal ion sensor development
Navarro, K.E.; Baeza-Rubio, J.; Boyd, M.; Foss, F.W.; Giri, S.; Jones, B.J.P.; Miller, R.L.; Nygren, D.R.; Samaniego, F.J.; Stogsdill, K.We present a tunable metal ion beam that delivers controllable ion currents in the picoamp range for testing of dry-phase ion sensors. Ion beams are formed by sequential atomic evaporation and single or multiple electron impact ionization, followed by acceleration into a sensing region. Controllability of the ionic charge state is achieved through tuning of electrode potentials that influence the retention time...
Design, setup and routine operation of a water treatment system for the monitor...
Azevedo, C.D.R.; Baeza, A.; Chauveau, E.; Corbacho, J.A.; Díaz, J.; Domange, J.; Marquet, C.; Martínez-Roig, M.; Piquemal, F.; Roldán, C.; Vasco, J.In the TRITIUM project, an on-site monitoring system is being developed to measure tritium (3H) levels in water near nuclear power plants. The quite low-energy betas emitted by 3H have a very short average path in water (5 μm as shown by simulations for 18 keV electrons). This path would be further reduced by impurities present in the water, resulting in a significant reduction of the detection efficiency. Ther...
The hybrid MPGD-based photon detectors of COMPASS RICH-1
Agarwala, J.; Alexeev, M.; Azevedo, C.D.R.; Bradamante, F.; Bressan, A.; Büchele, M.; Chatterjee, C.; Chiosso, M.; Cicuttin, A.; Ciliberti, P.Novel gaseous detectors of single photons for RICH applications have been developed and installed on COMPASS RICH-1 in 2016, covering a total area of 1.4 m2. They have a hybrid architecture consisting of two staggered THGEM layers (one equipped with a CsI photoconverting layer) and a bulk Micromegas and operate stably and efficiently, providing a single photon angular resolution of ∼1.8 mrad and about 10 detect...
Multi-slice Energy Resolving CT system using a THCOBRA detector operating in NeCH4
Carramate, L.F.N.D.; Silva, A.L.M.; Azevedo, C.D.R.; De Francesco, S.; da Silva, A.M.; Veloso, J.F.C.A.
Multi-slice Energy Resolving CT system using a THCOBRA detector operating in NeCH4
Carramate, L.F.N.D.; Silva, A.L.M.; Azevedo, C.D.R.; De Francesco, S.; da Silva, A.M.; Veloso, J.F.C.A.A 2D-Thick-COBRA based detector with 10 × 10 cm2 active area operating in Ne/CH4 (95/5) flow mode, was applied to X-ray Computed Tomography (CT). The CT system is based on a third generation scanner with the object motion provided by a stepper motor. Multi-slice acquisitions of a Poly(methyl methacrylate) phantom and of a sea snail were done and the cross-sectional images were used to perform tri-dimensional (3...
Operational properties of fine powder aerosol as radiation detection medium in ...
Duarte, N.F.V.; Monteiro, C.M.B.; Azevedo, C.D.R.; Antognini, A.; Amaro, F.D.Due to its exceptional properties, 3He proportional counters are the golden standard for neutron detection, particularly in homeland security applications where large area detectors are deployed. However, in recent years 3He has become severely scarce, which led to a tremendous price increase and acquisition restrictions of this material. Motivated by this, the development of 3He-free solutions became a priorit...