An efficient position sensitive detector for 3–30 keV positrons and electrons

Schmidt, PV; Willmann, Lorenz; Abela, R.; Bagaturia, J.; Bertl, W.; Braun, B.; Folger, H.; Jungmann, Klaus-Peter; Mzavia, D.; Putlitz, G. zu; Renker, D.; Sakhelashvilli, T; Zhang, L

doi:10.1016/0168-9002(96)00267-7

Cited by 12 publications

(9 citation statements)

References 8 publications

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“…[13][14][15] They are used also to measure neutrons, positrons, and pions. [16][17][18] The mechanism underlying signal generation in MCPs was investigated in several theoretical studies. 13,[19][20][21][22][23][24][25][26][27][28][29] The detection efficiency of MCPs to various particles is a function of mass, charge, and particle energy and to perform quantitative measurements, the relevant calibration studies are required.…”

Section: Introductionmentioning

confidence: 99%

“…19 The detection efficiency to electrons (or positrons) in the range 60-100 keV is observed to decline to about 16% which is interpreted as a decrease of the secondary electron emission coefficient of the active MCP materials. 18,35 In the current contribution, the MCP detection efficiencies to e − , µ − , and π − in the beam momentum range 17.5-345 MeV/c are investigated. The applied electron fluxes and energies are close to those expected in the Jupiter environment.…”

Section: Introductionmentioning

confidence: 99%

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Detection efficiency of microchannel plates for e− and π− in the momentum range from 17.5 to 345 MeV/c

Tulej

Meyer

Lüthi

et al. 2015

Review of Scientific Instruments

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High-energy e(-) and π(-) were measured by the multichannel plate (MCP) detector at the PiM1 beam line of the High Intensity Proton Accelerator Facilities located at the Paul Scherrer Institute, Villigen, Switzerland. The measurements provide the absolute detection efficiencies for these particles: 5.8% ± 0.5% for electrons in the beam momenta range 17.5-300 MeV/c and 6.0% ± 1.3% for pions in the beam momenta range 172-345 MeV/c. The pulse height distribution determined from the measurements is close to an exponential function with negative exponent, indicating that the particles penetrated the MCP material before producing the signal somewhere inside the channel. Low charge extraction and nominal gains of the MCP detector observed in this study are consistent with the proposed mechanism of the signal formation by penetrating radiation. A very similar MCP ion detector will be used in the Neutral Ion Mass (NIM) spectrometer designed for the JUICE mission of European Space Agency (ESA) to the Jupiter system, to perform measurements of the chemical composition of the Galilean moon exospheres. The detection efficiency for penetrating radiation determined in the present studies is important for the optimisation of the radiation shielding of the NIM detector against the high-rate and high-energy electrons trapped in Jupiter's magnetic field. Furthermore, the current studies indicate that MCP detectors can be useful to measure high-energy particle beams at high temporal resolution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection efficiency of microchannel plates for e− and π− in the momentum range from 17.5 to 345 MeV/c

Tulej

Meyer

Lüthi

et al. 2015

Review of Scientific Instruments

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“…During commissioning we have observed 57 events/s of USM at F3 using MCP that has open area ratio >50 %. Considering the efficiency of MCP (∼ 20% [8]), we expect the intensity of USM transported to F3 to be around 200 events/s. The stability of the system like laser, power supplies, etc.…”

Section: Transportation Of Ultra Slow Muonmentioning

confidence: 99%

Transportation of Ultra Slow Muon on U-line, MLF, J-PARC

Pant

Adachi

Ikedo

et al. 2018

Proceedings of the 14th International Conference on Muon Spin Rotation, Relaxation and Resonance (ΜSR2017)

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In order to study the surface and interface properties, and novel three-dimensional (3D) imaging of materials using spin polarized muon, we have been developing ultra slow muon microscope on Uline, MLF, J-PARC. Among its two legs, a leg, U1A area where ultra slow muon beam of ∼ mm size with energy 20 eV -30 keV will be available, is dedicated to surface and nano-science studies, whereas another leg, U1B area where muon micro beam will be available, is dedicated to novel 3D imaging of materials with µm spatial resolution. We have generated ultra slow muon and successfully transported to both areas (U1A and U1B). We have also performed simulation study using a Monte Carlo based code, musrSim, to improve the transportation efficiency and achieve intense ultra slow muon at sample positions in both areas. The measurement at different focusing points on the beam line, measurement and simulation study, and preliminary beam profile are reported.

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“…The solid angle for the detection of the energetic electron was increased by three orders of magnitude to 70 % of 4π by using a cylindrical magnetic spectrometer equipped with five concentric proportional chambers and a 64-fold segmented hodoscope which was constructed from the former SINDRUM I detector. The atomic positron is electrostatically accelerated and guided in a momentum selective transport system parallel to the magnetic field lines to a position sensitive MCP with resistive anode readout [46]. The tracks of these particles can be traced back to the interaction region for reconstructing a decay vertex providing an additional suppression of background.…”

Section: Coincidence Signatures Of the Atom's Decaymentioning

confidence: 99%

“…Among the major improvements are a detector for positrons with four times enhanced efficiency [46] and a beam line (πE5) with 5 times higher muon flux. Data have been collected for some 1300 hours and a preliminary result [47] is available which sets in (V ± A) × (V ± A) coupling an upper limit of G MM ≤ 3.2 · 10 −3 GF (90%C.L.).…”

Section: Outlook For Future Experimentsmentioning

confidence: 99%

The muonium atom as a probe of physics beyond the standard model

Willmann

Jungmann

Atomic Physics Methods in Modern Research

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Abstract. The observed interactions between particles are not fully explained in the successful theoretical description of the standard model to date. Due to the close confinement of the bound state muonium (M = µ + e − ) can be used as an ideal probe of quantum electrodynamics and weak interaction and also for a search for additional interactions between leptons. Of special interest is the lepton number violating process of sponteanous conversion of muonium to antimuonium.

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An efficient position sensitive detector for 3–30 keV positrons and electrons

Cited by 12 publications

References 8 publications

Detection efficiency of microchannel plates for e− and π− in the momentum range from 17.5 to 345 MeV/c

Detection efficiency of microchannel plates for e− and π− in the momentum range from 17.5 to 345 MeV/c

Transportation of Ultra Slow Muon on U-line, MLF, J-PARC

The muonium atom as a probe of physics beyond the standard model

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