Aging effect in the BESIII drift chamber

Dong, M. Y.; Xiu, Q. L.; Wu, L. J.; Wang, Zhi; Qin, Z. H.; Shen, Pin Chun; An, F. F.; Ju, Xu-Dong; Liu, Y.; Zhu, K. J.; Ouyang, Q.; Chen, YB

doi:10.1088/1674-1137/40/1/016001

Cited by 20 publications

(12 citation statements)

References 7 publications

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“…In order to reduce the dark currents of the sense wires and to use the detector in a safe configuration the voltage of the first four layers has been decreased with respect to the normal values, which result in the decrease of the performance of the detector. The gain with respect to 2009 status has been reduced up to 60% and this affects the event reconstruction worsening the detection efficiency up to 50% [34]. The gain of the cells closer to the IP shows a sizable decrease, as shown in Fig.…”

Section: The Needs Of a New Inner Tracker For Besiiimentioning

confidence: 87%

Research and development in cylindrical triple-GEM detector with $μ$TPC readout for the BESIII experiment

Farinelli

2019

Preprint

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The third generation of the Beijing Electron Spectrometer, BESIII, is an apparatus for high energy physics research. The hunting of new particles and the measurement of their properties or the research of rare processes are sought to understand if the measurements confirm the Standard Model and to look for physics beyond it. The detectors ensure the reconstruction of events belonging to the sub-atomic domain. The operation and the efficiency of the BESIII inner tracker is compromised due to the the radiation level of the apparatus. A new detector is needed to guarantee better performance and to improve the physics research. A cylindrical triple-GEM detector (CGEM) is an answer to this need: it will maintain the excellent performance of the inner tracker while improving the spatial resolution in the beam direction allowing a better reconstruction of secondary vertices. The technological challenge of the CGEM is related in its spatial limitation and the needed cylindrical shape. At the same time the detector has to ensure an efficiency close to 1 and a stable spatial resolution better than 150 µm, independently from the track incident angle and the presence of 1 T magnetic field.In the years 2014-2018 the CGEM-IT has been designed and built. Through several test beam and simulations the optimal configuration from the geometrical and electrical points of view has been found. A new electronics has been developed to readout charge amplitude and time information from the detector signal. This allows to measure the position of the charged particle interacting with the CGEM-IT. Two algorithms have been used for this purpose, the charge centroid and the µTPC, a new technique introduced by ATLAS in MicroMegas and developed here for the first time for triple-GEM detector.A complete triple-GEM simulation software has been developed to improve the knowledge of the detection processes. The software reproduces the CGEM-IT behavior in the BESIII offline software. The simulation of the CGEM-IT in the BESIII apparatus validates the improvements of the detector thought the study of some physics analysis.

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Section: The Needs Of a New Inner Tracker For Besiiimentioning

confidence: 87%

Research and development in cylindrical triple-GEM detector with $μ$TPC readout for the BESIII experiment

Farinelli

2019

Preprint

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“…The development of a new Cylindrical GEM (Gas Electron Multiplier) Inner Tracker, the CGEM-IT, stems from the need for the replacement of the inner drift chamber of the BESIII (Beijing Spectrometer III) experiment, which has been suffering a loss in performance due to aging phenomena [1] [2]. BESIII is a high energy physics experiment located at the southern interaction point of the BEPCII (Beijing Electron Positron Collider II) storage ring, at the Institute of High Energy Physics (IHEP) in Beijing.…”

Section: Context and Motivationmentioning

confidence: 99%

Operation of the new CGEM Inner Tracker for the Upgrade of the BESIII Experiment

Gramigna¹

2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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A ten years extension of the data taking of BESIII experiment, recently approved, motivated an upgrade program both for the leptonic collider BEPCII and for some of the sub-detectors of the spectrometer. In particular, the current inner drift chamber is suffering from aging and the proposal is to replace it with a detector based on cylindrical GEM technology. The CGEM detector is made of three coaxial layers of triple GEM. The tracker is expected to restore the efficiency, to improve the z determination and the secondary vertex position reconstruction with respect to the current inner tracker, with a resolution of 130 µm in xy plane and better than 350 µm along the beam direction. A cosmic telescope instrumented with two out of three layers is in operation in Beijing since January 2020, remotely controlled by Italian groups due to the pandemic situation. In this presentation, the general status of the project will be presented with a particular focus on the preliminary results from the cosmic data taking and future plans.

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“…The MDC encountered the Malter effect [4] due to cathode aging during ψ(3686) data taking in 2012. This effect was suppressed by mixing about 0.2% water vapor into the MDC operating gas [5] and can be well modeled by Monte Carlo (MC) simulation. The other sub-detectors worked well during 2009 and 2012.…”

Section: Besiii Detector and Monte Carlo Simulationmentioning

confidence: 99%

Determination of the number of ψ(3686) events at BESIII

Ablikim¹,

Ачасов²,

Ai³

et al. 2018

Chinese Phys. C

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The numbers of ψ(3686) events accumulated by the BESIII detector for the data taken during 2009 and 2012 are determined to be (107.0±0.8)×10 6 and (341.1±2.1)×10 6 , respectively, by counting inclusive hadronic events, where the uncertainties are systematic and the statistical uncertainties are negligible. The number of events for the sample taken in 2009 is consistent with that of the previous measurement. The total number of ψ(3686) events for the two data taking periods is (448.1±2.9)×10 6 .

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Aging effect in the BESIII drift chamber

Cited by 20 publications

References 7 publications

Research and development in cylindrical triple-GEM detector with $μ$TPC readout for the BESIII experiment

Research and development in cylindrical triple-GEM detector with $μ$TPC readout for the BESIII experiment

Operation of the new CGEM Inner Tracker for the Upgrade of the BESIII Experiment

Determination of the number of ψ(3686) events at BESIII

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