Upgrade of ASACUSA's antihydrogen detector

被引：0

作者：

Kraxberger, V. ^{[1
]}

Amsler, C. ^{[1
]}

Breuker, H. ^{[2
]}

Chesnevskaya, S. ^{[1
]}

Costantini, G. ^{[3
,4
]}

Ferragut, R. ^{[5
,6
]}

Giammarchi, M. ^{[6
]}

Gligorova, A. ^{[1
]}

Gosta, G. ^{[3
,4
]}

Higaki, H. ^{[7
]}

Hunter, E. D. ^{[1
]}

Killian, C. ^{[1
]}

Kletzl, V. ^{[1
,14
]}

Kuroda, N. ^{[8
]}

Lanz, A. ^{[1
,9
]}

Leali, M. ^{[3
,4
]}

Maeckel, V. ^{[1
]}

Maero, G. ^{[6
,10
]}

Malbrunot, C. ^{[11
,15
]}

Mascagna, V. ^{[3
,4
]}

Matsuda, Y. ^{[8
]}

Migliorati, S. ^{[3
,4
]}

Murtagh, D. J. ^{[1
]}

Nagata, Y. ^{[12
]}

Nanda, A. ^{[1
,9
]}

Nowak, L. ^{[9
,11
]}

Pasino, E. ^{[6
,10
]}

Rome, M. ^{[6
,10
]}

Simon, M. C. ^{[1
]}

Tajima, M. ^{[13
]}

Toso, V. ^{[5
,6
]}

Ulmer, S. ^{[2
]}

Venturelli, L. ^{[3
,4
]}

Weiser, A. ^{[1
,9
]}

Widmann, E. ^{[1
]}

Wolz, T. ^{[11
]}

Yamazaki, Y. ^{[2
]}

Zmeskal, J. ^{[1
]}

机构：

[1] Austrian Acad Sci, Stefan Meyer Inst Subatom Phys, Vienna, Austria

[2] RIKEN, Ulmer Fundamental Symmetries Lab, Saitama, Japan

[3] Univ Brescia, Dipartimento Ingn Informaz, Brescia, Italy

[4] INFN, Sez Pavia, Pavia, Italy

[5] Politecn Milan, Milan, Italy

[6] INFN, Sez Milano, Milan, Italy

[7] Hiroshima Univ, Grad Sch Adv Sci & Engn, Hiroshima, Japan

[8] Univ Tokyo, Inst Phys, Grad Sch Arts & Sci, Tokyo, Japan

[9] Univ Vienna, Vienna Doctoral Sch Phys, Vienna, Austria

[10] Univ Milan, Dipartimento Fis, Milan, Italy

[11] CERN, Expt Phys Dept, Geneva, Switzerland

[12] Tokyo Univ Sci, Dept Phys, Tokyo, Japan

[13] RIKEN Nishina Ctr Accelerator Based Sci, Saitama, Japan

[14] Paul Scherrer Inst, Villigen, Switzerland

[15] TRIUMF, Vancouver, BC, Canada

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2023年 / 1045卷

基金：

奥地利科学基金会;

关键词：

Antihydrogen; Antimatter; Data acquisition; Silicon photomultiplier;

D O I：

10.1016/j.nima.2022.167568

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The goal of the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) CUSP experiment at CERN's Antiproton Decelerator is to measure the ground state hyperfine splitting of antihydrogen in order to test whether CPT invariance is broken.The ASACUSA hodoscope is a detector consisting of two layers of 32 plastic scintillator bars individually read out by two serially connected silicon photomultipliers (SiPMs) on each end. Two additional layers for position resolution along the beam axis were scintillator fibres, which will now be replaced by scintillating tiles placed onto the existing bars and also read out by SiPMs. If the antiproton of antihydrogen annihilates in the centre of the hodoscope, particles (mostly pions) are produced and travel through the various layers of the detector and produce signals.The hodoscope was successfully used during the last data taking period at CERN. The necessary time resolution to discriminate between particles travelling through the detector from outside and particles produced in the centre of the detector was achieved by the use of waveform digitisers and software constant fraction discrimination. The disadvantage of this readout scheme was the slow readout speed, which was improved by two orders of magnitude. This was done by omitting the digitisers and replacing them with TDCs reading out the digital time-over-threshold (ToT) signal using leading edge discrimination.

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页数：3

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