Search results for: A. Stanovnik

Items from 1 to 20 out of 59 results

article

Studies of a hybrid avalanche photo-detector in magnetic field

L. Šantelj, I. Adachi, K. Hataya, S. Iori, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2017 > 845 > C > 459-462

For the Belle II spectrometer a proximity focusing RICH counter with an aerogel radiator (ARICH) will be employed as a PID system in the forward endcap region of the spectrometer. The main challenge was the development of a reliable multichannel sensor for single photons that operates in the high magnetic field of the spectrometer (1.5T) and withstands the radiation levels expected at the experiment...

article

A 144-channel HAPD for the Aerogel RICH at Belle II

S. Korpar, I. Adachi, N. Hamada, M. Higuchi, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2014 > 766 > C > 145-147

A hybrid photo-detector (HAPD) has been developed for the aerogel RICH (ARICH) of the Belle II experiment. In the present contribution we report the performance tests in magnetic fields, results of the neutron and gamma irradiation studies, and of aging tests. We also review the production status and plans.

article

Study of a Cherenkov TOF-PET module

S. Korpar, R. Dolenec, P. Križan, R. Pestotnik, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 732 > Complete > 595-598

An apparatus, consisting of two PbF ₂ crystals, each coupled to a multichannel plate photomultiplier (MCP-PMT), has been constructed in order to measure the time-of-flight (TOF) of the two 511keV annihilation photons produced in positron emission tomography (PET). Excellent timing is achieved by detecting the prompt Cherenkov photons produced by the absorption of the 511keV gamma photons....

article

Study of TOF PET using Cherenkov light

S. Korpar, R. Dolenec, P. Križan, R. Pestotnik, more

Physics Procedia > 2012 > 37 > Complete > 1531-1536

We report on measurements of coincident 511 keV annihilation photons via detection of Cherenkov radiation in PbF2 crystals attached to a microchannel plate photomultiplier. Back to back timing resolution has been studied with segmented crystals. The detection efficiency has also been measured and compared to the simulation results. We have also searched for the optimum radiator parameters by simulating...

article

Study of TOF PET using Cherenkov light

S. Korpar, R. Dolenec, P. Križan, R. Pestotnik, more

Nuclear Inst. and Methods in Physics Research, A > 2011 > 654 > 1 > 532-538

This work investigates the possibilities of improving the measurements of arrival time difference of the two 511keV photons arising from annihilation of a positron in positron emission tomography (PET). The new technique of detecting the prompt Cherenkov light, produced by absorption of the annihilation photon in a suitable crystal, could considerably improve the image quality. A simple apparatus...

article

Photonis MCP PMT as a light sensor for the Belle II RICH

S. Korpar, I. Adachi, R. Dolenec, P. Križan, more

Nuclear Inst. and Methods in Physics Research, A > 2011 > 639 > 1 > 162-164

We report about on-the-bench studies of Photonis multi anode micro-channel plate (MCP) PMTs, as candidate photodetectors for the aerogel RICH counter of the Belle II spectrometer. This photosensor is fast enough to be used also as a time-of-flight counter, which would complement the kinematic range of the aerogel RICH counter.

article

Performance study of silicon photomultipliers as photon detectors for PET

R. Verheyden, H. Chagani, R. Dolenec, R. Pestotnik, more

Nuclear Inst. and Methods in Physics Research, A > 2011 > 628 > 1 > 381-384

The use of Silicon Photo-Multipliers (SiPMs) as photon detectors in Positron Emission Tomography (PET) modules offers significant advantages over conventional light sensors, including application in a magnetic field, better resolution and easier operation. Different types of SiPMs have been tested: Photonique, 2.1×2.1mm ² , Hamamatsu 3×3mm ² and STMicroelectronics 3.5×3.5mm ² ...

article

Tests of a silicon photomultiplier module for detection of Cherenkov photons

R. Dolenec, H. Chagani, S. Korpar, P. Križan, more

Nuclear Inst. and Methods in Physics Research, A > 2011 > 628 > 1 > 398-402

Silicon photomultipliers, whose main advantage over conventional photomultiplier tubes is the operation in high magnetic fields, have been considered as position sensitive, single photon detectors in a proximity focusing RICH with aerogel radiator. A module, consisting of 64 (8×8) Hamamatsu MPPC S10362-11-100P silicon photomultipliers, has been constructed and tested with Cherenkov photons emitted...

article

Silicon photo-multipliers as photon detectors for PET

R. Pestotnik, S. Korpar, H. Chagani, R. Dolenec, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2010 > 623 > 1 > 594-596

A novel photon detector, the Silicon Photomultiplier (SiPM), has been tested in view of a photosensitive device for Positron Emission Tomography (PET), which is one of the most important non-invasive methods for in-depth and in vivo imaging of tissue. Such a device offers advantages over existing ones, including application in a magnetic field, better resolution and easier operation. Two PET modules...

chapter

Performance study of Silicon Photomultipliers as photon detectors for PET

R Verheyden, S Korpar, P Krizan, A Stanovnik, more

IEEE Nuclear Science Symposuim & Medical Imaging Conference > 1494 - 1497

2010 IEEE Nuclear Science Symposium and Medical Imaging Conference (2010 NSS/MIC)

The use of Silicon Photomultipliers (SiPMs) as photon detectors in Positron Emission Tomography (PET) modules offers significant advantages over conventional light sensors. These advantages include application in a magnetic field, better resolution and easier operation. A STMicroelectronics SiPM prototype (3.5 × 3.5 mm² in a TO-8 can package) has been tested extensively. Surface sensitivity, gain...

chapter

Time-of-flight measurements with Cherenkov photons produced by 511 keV photons in lead crystals

R Dolenec, S Korpar, P Krizan, R Pestotnik, more

IEEE Nuclear Science Symposuim & Medical Imaging Conference > 280 - 284

2010 IEEE Nuclear Science Symposium and Medical Imaging Conference (2010 NSS/MIC)

The resolution of time-of-flight measurements is usually limited by the decay time constant of the scintillating material used. If Cherenkov photons, which are produced promptly, could be used to measure the time-of-flight, the limiting factor would become the photo detector. The excellent time resolution of the microchannel plate photomultiplier (MCP PMT) lead us to consider the possibility of performing...

article

Measurements of Cherenkov Photons with Silicon Photomultipliers

S. Korpar, I. Adachi, H. Chagani, R. Dolenec, more

Nuclear Physics B (Proceedings Supplements) > 2009 > 197 > 1 > 283-287

A novel photon detector, the Silicon Photomultiplier (SiPM), has been tested in proximity focusing Ring Imaging Cherenkov (RICH) counters that were exposed to cosmic-ray particles in Ljubljana, and a 2 GeV electron beam at the KEK research facility. This type of RICH detector is a candidate for the particle identification detector upgrade of the BELLE detector at the KEK B-factory, for which the use...

article

Measurement of Cherenkov photons by SiPMs with light guides

S. Korpar, H. Chagani, R. Dolenec, K. Hara, more

Nuclear Inst. and Methods in Physics Research, A > 2009 > 610 > 1 > 427-430

Silicon Photomultipliers (SiPMs) are attractive photon detectors for Ring Imaging Cherenkov (RICH) counters inside large magnetic spectrometers due to their insensitivity to magnetic fields. We have investigated the possibilities offered by these new photon detectors in a cosmic ray test set-up. Cherenkov photons emitted by cosmic ray particles in an aerogel radiator have been detected with silicon...

chapter

Time-of-flight with photonis multi-channel MCP-PMT using MCP signal

R. Dolenec, H. Chagani, S. Korpar, P. Krizan, more

2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC) > 1558 - 1560

2009 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2009)

Multi-channel MCP-PMTs are considered as position sensitive detectors of single Cherenkov photons for the upgrade of particle identification systems at B-factories, where magnetic field tolerant sensors are required. They also exhibit excellent timing properties. In the case of proximity focusing RICH detector this allows to measure the time-of-flight employing the Cherenkov light produced in the...

chapter

Tests of silicon photomultiplier PET modules

H. Chagani, R. Dolenec, S. Korpar, P. Krizan, more

2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC) > 1518 - 1520

2009 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2009)

The use of Silicon Photomultipliers (SiPMs) as photon detectors in Positron Emission Tomography (PET) modules offers significant advantages over conventional light sensors, including application in a magnetic field, better resolution and easier operation. Two PET modules have been constructed by coupling 4 ?? 4 arrays of LYSO sctintillation crystals of area 4.2 ?? 4.2 mm² and length 20 mm to SiPMs...

article

Erratum to: V0 production in p+A collisions at $\sqrt{s}=41.6$ GeV

The HERA-B Collaboration, I. Abt, M. Adams, M. Agari, more

The European Physical Journal C > 2009 > 64 > 1 > 167-168

article

Angular distributions of leptons from J/ψ’s produced in 920 GeV fixed-target proton-nucleus collisions

I. Abt, M. Adams, M. Agari, H. Albrecht, more

The European Physical Journal C > 2009 > 60 > 4 > 517-524

A study of the angular distributions of leptons from decays of J/ψ’s produced in p-C and p-W collisions at $\sqrt{s}=41.6\mbox{~GeV}$ has been performed in the J/ψ Feynman-x region −0.34<x _F<0.14 and for J/ψ transverse momenta up to 5.4 GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a clean selection of 2.3×10...

article

Kinematic distributions and nuclear effects of J/ψ production in 920 GeV fixed-target proton-nucleus collisions

The HERA-B Collaboration, I. Abt, M. Adams, M. Agari, more

The European Physical Journal C > 2009 > 60 > 4 > 525-542

Measurements of the kinematic distributions of J/ψ mesons produced in p–C, p–Ti and p–W collisions at $\sqrt{s}=41.6~\mathrm{GeV}$ in the Feynman-x region −0.34<x _F<0.14 and for transverse momentum up to p _T=5.4 GeV/c are presented. The x _F and p _T dependencies of the nuclear suppression parameter, α, are also given. The results are based on 2.4×10⁵ J/ψ mesons reconstructed in both...

article

V ⁰ production in p+A collisions at $\sqrt{s}=41.6$ GeV

The HERA-B Collaboration, I. Abt, M. Adams, M. Agari, more

The European Physical Journal C > 2009 > 61 > 2 > 207-221

Inclusive doubly differential cross sections d ² σ _pA/dx _F dp _T ² as a function of Feynman-x (x _F) and transverse momentum (p _T) for the production of K _S ⁰ , Λ and $\bar{\varLambda}$ in proton-nucleus interactions at 920 GeV are presented. The measurements were performed by HERA-B in the negative x _F range (−0.12<x _F<0.0) and for transverse momenta up to p _T=1.6 GeV/...

chapter

Timing and cross-talk properties of BURLE/Photonis multi-channel MCP PMTs

S. Korpar, R. Dolenec, P. Krizan, R. Pestotnik, more

2008 IEEE Nuclear Science Symposium Conference Record > 2471 - 2474

2008 IEEE Nuclear Science Symposium and Medical Imaging conference (2008 NSS/MIC)

We report on studies of the two types of BURLE multi-anode micro-channel plate (MCP) PMTs; one with 64 channels and 25 μm pores and the other with 4 channels and 10 μm pores. Possible applications of these tubes are for RICH detectors and time-of-flight counters. We have investigated their timing properties and cross-talk. The origin of the cross talk between the channels was investigated by studying...

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INFONA - science communication portal

Search results for: A. Stanovnik

Studies of a hybrid avalanche photo-detector in magnetic field

A 144-channel HAPD for the Aerogel RICH at Belle II

Study of a Cherenkov TOF-PET module

Study of TOF PET using Cherenkov light

Study of TOF PET using Cherenkov light

Photonis MCP PMT as a light sensor for the Belle II RICH

Performance study of silicon photomultipliers as photon detectors for PET

Tests of a silicon photomultiplier module for detection of Cherenkov photons

Silicon photo-multipliers as photon detectors for PET

Performance study of Silicon Photomultipliers as photon detectors for PET

Time-of-flight measurements with Cherenkov photons produced by 511 keV photons in lead crystals

Measurements of Cherenkov Photons with Silicon Photomultipliers

Measurement of Cherenkov photons by SiPMs with light guides

Time-of-flight with photonis multi-channel MCP-PMT using MCP signal

Tests of silicon photomultiplier PET modules

Erratum to: V0 production in p+A collisions at $\sqrt{s}=41.6$ GeV

Angular distributions of leptons from J/ψ’s produced in 920 GeV fixed-target proton-nucleus collisions

Kinematic distributions and nuclear effects of J/ψ production in 920 GeV fixed-target proton-nucleus collisions

V ⁰ production in p+A collisions at $\sqrt{s}=41.6$ GeV

Timing and cross-talk properties of BURLE/Photonis multi-channel MCP PMTs

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