MCP-PMT timing property for single photons Akatsu, M; Enari, Y; Hayasaka, K ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2004, Letnik:
528, Številka:
3
Journal Article
Recenzirano
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
σ=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 been prepared, and a time resolution
σ∼10
ps
was attained for a high-energy
π-beam by multiple photons.
The Time-Of-Propagation (TOP) counter measures both the time and position information of radiated photons with high resolutions to distinguish the Cherenkov angles between different particle species. ...Current R&D status is reported. We also propose a further simplified version of the TOP-counter.
The cross section for e(+)e(-)-->pi(+)pi(-)J/psi between 3.8 and 5.5 GeV/c(2) is measured using a 548 fb(-1) data sample collected on or near the Upsilon(4S) resonance with the Belle detector at ...KEKB. A peak near 4.25 GeV/c(2), corresponding to the so called Y(4260), is observed. In addition, there is another cluster of events at around 4.05 GeV/c(2). A fit using two interfering Breit-Wigner shapes describes the data better than one that uses only the Y(4260), especially for the lower-mass side of the 4.25 GeV enhancement.
The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction ...methods, we find evidence of statistically significant azimuthal asymmetries for charged pion pairs in e(+)e(-) annihilation at a center-of-mass energy of 10.52 GeV, which can be attributed to a transverse polarization of the primordial quarks. The measurement was performed using a sample of 79 x 10(6) hadronic events collected with the Belle detector.
HAPD time-resolution study under single-photon irradiation Matsui, S.; Akatsu, M.; Enari, Y. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2001, Letnik:
463, Številka:
1
Journal Article
Recenzirano
We have studied the timing property of a Hybrid Avalanche PhotoDiode, Hamamatsu R7110U-07, and attained a time resolution of
σ
t
∼150
ps
for single photons and ⩽100
ps for a few photons under certain ...conditions of photocathode voltage and diode reverse bias voltage. Relation between the achievable timing resolution and a multiplication gain is discussed, especially in realizing
σ
t
⩽100
ps
for single photons.
We report a measurement of the exclusive e+e- -->D(*)+/-D*-/+ cross section as a function of center-of-mass energy near the D(*)+/-D*-/+ threshold with initial-state radiation. A partial ...reconstruction technique is used to increase the efficiency and to suppress background. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 547.8 fb(-1).
Cross-talk suppressed multi-anode MCP-PMT Inami, K.; Mori, T.; Matsumura, T. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2008, Letnik:
592, Številka:
3
Journal Article
Recenzirano
Odprti dostop
We have developed a 4-channel multi-anode MCP-PMT, SL10, which exhibits good performance of the transit time spread,
σ
TTS
≃
30
ps
for single photons with a gain of
∼
10
6
and a peak quantum ...efficiency of
20
%
under a magnetic field of
⩽
1.5
T
. The cross-talk among anodes has been extensively studied. We have taken two measures to suppress it: one is to configure the SL10 to an effectively independent four small pieces of MCP-PMT's by segmenting an electrode of the second MCP-layer; the other is to use a constant-fraction discriminator. A remarkable improvement has been achieved.
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