نتایج جستجو برای: cherenkov counter
تعداد نتایج: 42887 فیلتر نتایج به سال:
We have measured the performance, especially the timing properties, of micro-channel plate photo-multiplier tubes (MCP-PMTs) by irradiating with single photons with/without a magnetic field. A time resolution of s 1⁄4 30–35 ps was obtained for single photons under 1:5 T: With an MCP-PMT, a small time-of-flight counter, by means of Cherenkov light radiation instead of scintillation light has bee...
The Time-Of-Propagation (TOP) counter is a novel ring-imaging Cherenkov detector that primarily consists of quartz bar radiator, micro-channel plate photomultipliers and front-end readout electronics. These TOP counters are installed in the central region Belle II to provide crucial information on charged particle identification (PID). Here, we present an overview PID studies II, with focus per...
In this paper, the production mechanisms and the spectral-angular distribution of X-ray Cherenkov radiation (XCR) was investigated in detail and some unique properties of XCR and its applications were discussed. It is shown that, in the vicinity of the atomic absorption edges, the real and the imaginary parts of the refractive index are varied drastically and for some materials the refractive i...
Cherenkov radiation is generated when relativistic charged particles move in a medium with refractive index larger than unity. Although, the refractive index is generally smaller than unity in X-ray region, in the vicinity of atomic absorption edges, the refractive index may exceed unity and Cherenkov radiation can be generated in soft X-ray region with a narrow band width. In this paper, the s...
We review the recent developments in the field of ultrafast Cherenkov fiber lasers. Two essential properties of such laser systems - broad wavelength tunability and high efficiency of Cherenkov radiation wavelength conversion are discussed. The exceptional performance of the Cherenkov fiber laser systems are highlighted - dependent on the realization scheme, the Cherenkov lasers can generate th...
Suitably designed optical fibers are shown to offer a powerful tool for functional brain mapping, facilitating the detection of Cherenkov radiation generated by relativistic positrons from positron-emitting radionuclides. Fiber probes support a low-loss delivery of the high-intensity short-wavelength part of the Cherenkov spectrum, which is strongly absorbed by biotissues, and lower the thresho...
R. Hohler1,2, D. Dutta†1, D. Lehmann1, K. Peters1,2, B. Roy‡1, G. Schepers1, C. Schwarz1, J. Schwiening1, C. Sfienti§ 1, and A. Vañó Viñuales3 1GSI, Darmstadt, Germany; 2Goethe Universität Frankfurt, Germany; 3Universitat de les Illes Balears, Spain Particle identification (PID) for hadrons and leptons over a large range of solid angles and momenta is an essential requirement for meeting the ph...
Tests of 2300 Hamamatsu multianode photomultipliers (1543 pieces of R5900-M16 and 762 pieces of R5900-M4) have been tested on the bench in order to evaluate their performance for use as position-sensitive photon detectors in the ring imaging Cherenkov counter of the HERA-B experiment.1 A weak and stable source of photons has been obtained by Cherenkov radiation of electrons from a 90Sr source i...
Reversed Cherenkov radiation is the exotic electromagnetic radiation that is emitted in the opposite direction of moving charged particles in a left-handed material. Reversed Cherenkov radiation has not previously been observed, mainly due to the absence of both suitable all-metal left-handed materials for beam transport and suitable couplers for extracting the reversed Cherenkov radiation sign...
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