- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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The LXe calorimeter and the pixelated timing counter in the MEG II experiment
摘要： The MEG experiment is to look for a lepton flavor violating μ + → e+γ decay with an unprecedented sensitivity, and we set an upper limit of the branching ratio for this decay, 5.7 × 10?13 at 90% C.L. in 2013 which is a twenty times more stringent limit than the previous experiment, MEGA. Since the sensitivity improvement was limited by the accidental background, we have considered the major detector upgrade. A proposal was submitted to PSI committee, and was approved in 2013, which aims at a sensitivity enhancement of one order of magnitude compared with the current MEG experiment. Here mainly two components of the MEG detector will be introduced, a γ-ray calorimeter with 900 L of liquid xenon (LXe), and a pixelated timing counter. The LXe detector will be improved by increasing the granularity at the incident face, by replacing the current PMTs with a larger number of smaller photosensors (MPPC) and optimizing the photosensor layout also on the lateral faces. A new highly segmented, fast timing counter array will replace the old system to allow improved timing resolution capabilities.
关键词： visible and IR photons (solid-state),HPG,Large detector systems for particle and astroparticle physics,Photon detectors for UV,CZT,Gamma detectors (scintillators,HgI etc),Timing detectors
更新于2025-09-23 15:23:52
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Analysis and numerical design of Resistive AC-Coupled Silicon Detectors (RSD) for 4D particle tracking
摘要： In this paper we present the numerical simulation of silicon detectors with internal gain as the main tool for 4-dimensional (4D) particle trackers design and optimization. The Low-Gain Avalanche Diode (LGAD) technology and its present limitations are reviewed with the aim of introducing the Resistive AC-Coupled Silicon Detectors (RSD) paradigm as a case study of our investigation. Authors here present Spice-like and 2D/3D Technological Computer-Aided Design (TCAD) simulations to characterize sensors in terms of both their electrostatic behavior, capacitive (dynamic) coupling and radiation-hardness performances, showing the methodological approach used in order to extract the set of layout rules allowing the release of RSD1, the incoming production run at Fondazione Bruno Kessler (FBK) of next-generation silicon detectors for 4D tracking with intrinsic 100% fill-factor.
关键词： Charge multiplication,Fast detectors,Solid-state silicon detectors,TCAD modeling,Particle tracking detectors,Particle timing detectors
更新于2025-09-16 10:30:52
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Fabrication and performance of AC-coupled LGADs
摘要： Detectors that can simultaneously provide ?ne time and spatial resolution have attracted wide-spread interest for applications in several ?elds such as high-energy and nuclear physics as well as in low-energy electron detection, photon science, photonics and imaging. Low-Gain Avalanche Diodes (LGADs), being fabricated on thin silicon substrates and featuring a charge gain of up to 100, exhibit excellent timing performance. Since pads much larger than the substrate thickness are necessary to achieve a spatially uniform multiplication, a ?ne pad pixelation is di?cult. To overcome this limitation, the AC-coupled LGAD approach was introduced. In this type of device, metal electrodes are placed over an insulator at a ?ne pitch, and signals are capacitively induced on these electrodes. At Brookhaven National Laboratory, we have designed and fabricated prototypes of AC-coupled LGAD sensors. The performance of small test structures with di?erent particle beams from radioactive sources are shown.
关键词： Charge transport and multiplication in solid media,Detector modelling and simulations II (electric ?elds, charge transport, multiplication and induction, pulse formation, electron emission, etc),Solid state detectors,Timing detectors
更新于2025-09-12 10:27:22
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Development of the FTM technology for TOF-PET
摘要： Gas detector research focused in particular on the radiation induced processes leading to discharge breakdown led, thanks to advances in photolithography and micro-electronics, to the development of a family of resistant devices named Micro-Pattern Gas Detectors (MPGDs) [1]. The main features of the MPGDs are: a flexible geometry; a high rate capability (>MHz/cm2); an excellent spatial resolution (<μm); a good time resolution (5-10 ns); and a reduced radiation length. A new detector layout, named Fast Timing MPGD (FTM), has been recently proposed [2]. The FTM would combine both the high spatial resolution and high rate capability of the MPGDs while improving the time resolution with nearly two orders of magnitude to ～100 ps. This contribution studies the possibility to adapt the FTM technology for TOF-PET imaging.
关键词： Timing detectors,Micro-pattern Gas Detectors
更新于2025-09-09 09:28:46