Vertex locator (VELO) is a silicon microstrip detector situated around the interaction point in the large Hadron Collider beauty (LHCb) spectrometer at the Large Hadron Collider. The LHCb experiment ...is dedicated to studying charge conjugation and parity symmetry violation in the heavy flavor sector and rare decays of B mesons. The precise reconstruction of both the primary and secondary vertices, obtained by the VELO, is crucial in the selection of signal events containing b and c quarks and lifetime measurements. VELO consists of two retractable parts that operate at 8 mm from the interaction region. Its proximity to proton beams makes the LHCb VELO a place for studying radiation damage effects in silicon detectors in proton-proton and heavy-ion collisions. The latest results from radiation damage studies and their impact on the operation of the LHCb VELO after the first data-taking period (Run I) and the ongoing Run II are presented in this paper. The main macroscopic parameters, influenced by particle fluence, are described along with selected methods of their monitoring. All the results show that VELO sustains the impact of high fluence of radiation, and its performance will not change significantly until the end of Run II.
The BiPo-3 detector Loaiza, P.; Barabash, A.S.; Basharina-Freshville, A. ...
Applied radiation and isotopes,
05/2017, Letnik:
123
Journal Article
Recenzirano
The BiPo-3 detector is a low radioactive detector dedicated to measuring ultra-low natural contaminations of 208Tl and 214Bi in thin materials, initially developed to measure the radiopurity of the ...double β decay source foils of the SuperNEMO experiment at the μBq/kg level. The BiPo-3 technique consists in installing the foil of interest between two thin ultra-radiopure scintillators coupled to low radioactive photomultipliers. The design and performances of the detector are presented.
In this paper, the final results of the 208Tl and 214Bi activity measurements of the first enriched 82Se foils are reported for the first time, showing the capability of the detector to reach sensitivities in the range of some μBq/kg.
•BiPo3 : low radioactive detector to measure ultra-low levels of 208Tl and 214Bi.•Backgrounds characterized.•Surface background : A(208Tl) =(0.9±0.2)μBq/m2 and A(214Bi) =(1.0±0.3)μBq/m2.•First SuperNemo double β source foils measured : A(208Tl) =(21±11)μBq/kg and A(214Bi) < 290μBq/kg at 90% C.L.•Shows capability to measure 208Tl in the range of some μBq/kg.
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