In the Fermilab Muon g-2 experiment, the anomalous precession frequency of the muon was extracted from calorimeter data that recorded the energy and time spectrum of the positrons. The probability of a calorimeter detecting a positron from muon decay exhibits spatial and energy dependence, as well as variations due to the materials in the vicinity of the calorimeter. Coupled with muon beam...
The Shanghai SHINE facility is in the throes of construction at the Zhangjiang Science Park in Shanghai. This state-of-the-art facility is poised to generate a pulsed electron beam with an energy of 8 GeV, a charge of 100 pC, and the potential to achieve a maximum repetition rate of 1 MHz. Marking a departure from traditional proton-driven muon sources, our approach involves the use of a...
Muon sources are critical in advancing both fundamental physics research and various applied sciences. High-Repetition-Rate (HRR) muon beams, in particular, are optimal for numerous precision experiments in fundamental physics. To assess the accuracy of the simulation model for the HRR muon beam produced at the SHINE facility (The Shanghai High repetition rate XFEL and Extreme light facility),...
The effectiveness of a spark chamber in detecting charged particles is contingent upon the timely recombination of ions after a Townsend avalanche, typically occurring over several microseconds. To achieve optimal spark efficiency, the system necessitates fast electronics capable of operating within a delay time of less than 500 ns. The spark chamber's electronic system is composed of three...
The spark chamber is a particle detector for visualizing the paths of electrically charged particles through the Townsend avalanche effect. At TDLI, we are developing a spark chamber prototype with dimensions of 525 mm × 370 mm × 130 mm using aluminum plates, designed for both demonstration and educational purposes. Our design process has encountered challenges in three main areas: sealing,...
Permanent electric dipole moments (EDMs) of elementary particles violate CP symmetry. Compared with the current muon EDM limit($|d_\mu| < 1.8 \times 10^{-19}e\cdot cm$) obtained from the BNL Muon g-2 Collaboration, the contribution to the muon EDM from the standard model is negligible ($|d_\mu| \sim 1.4 \times 10^{-38}e\cdot cm$), making the EDMs of elementary particles very sensitive probes...
Using about $(10087\pm44)\times10^6$ $J/\psi$ events collected with the BESIII detector at the BEPCII $e^+e^-$ storage ring at the center-of-mass energy of $\sqrt{s}=3.097~\rm{GeV}$, we present the first search for the weak interaction between muon and charmonium through the semi-muonic charmonium decay $J/\psi\rightarrow D^-\mu^+\nu_{\mu}+c.c.$. Since no significant signal is observed, we...
The Muonium-to-Antimuonium Conversion Experiment (MACE) is proposed to search for this charged lepton flavor violating process and obtain a higher sensitivity than the 1990’s experiment in PSI, taking advantage of recent technique developments. One clear signature of the conversion is given by positron produced by antimuonium decay. We have designed a positron transport solenoid using...
Interest in searches for Charged Lepton Flavor Violation (CLFV) has continued in the past few decades, only since the observation of CLFV will indicate new physics beyond the Standard Model. As many future lepton colliders with high luminosities have been proposed, the search for CLFV will reach an unprecedented level of precision. Many model of physics beyond the Standard Mode (BSM) allow...
Majorana properties of neutrinos have long been a focus in the pursuit of possible new physics beyond the standard model, which has motivated lots of dedicated theoretical and experimental studies. A future same-sign muon collider is an ideal platform to search for Majorana neutrinos through the Lepton Number Violation process: $\mu^{+}\mu^{+}\rightarrow W^{+}W^{+}$. Specifically, this...
https://iopscience.iop.org/article/10.1088/1361-6471/ad2b7d
Muon scattering tomography (MST) is a non-destructive technique to image various materials by utilizing cosmic ray muons as probes. A typical MST system with a two-fold track detectors is particularly effective in detecting high-$Z$ materials (e.g. nuclear materials), but difficult to recognize low-$Z$ materials (e.g. explosive materials). In this poster, we present a concept of MST system to...
Accurate knowledge about proton charge radius is essential to high-precision QED calculations of atomic energy levels, and to test the Standard Model. It also has a strong impact on the Rydberg constant. Typically, one can measure the proton charge radius using ordinary hydrogen spectroscopy or elastic e-p scattering. However, in 2010, the first muonic hydrogen spectroscopy experiment, with an...
To meet the requirement of the next-generation muon source driven by cw superconducting linac, a new solution of for the muon production target is essential. In comparison to the rotating graphite target, the free-surface liquid lithium target proposed in this paper offers advantages in surface muon production efficiency, heat-removal ability, and target geometry compactness. Owing to its...
一种新的缪子透射成像算法
Muography is a promising non-destructive probing method with unique advantages for
geophysical detection and historical relics protection, among others. It utilizes muon absorption for large-scale object imaging. However, traditional algorithms have limitations in reconstructing anomalies distant from the detectors, leading to deformation or “fake” anomalies. To address this...
The muonic X-rays emitted in the capture and absorption process of negative muons in matter have higher energy than characteristic X-rays, which can be used for nondestructive analysis of ~10 μm to ~cm scale material samples. The excellent energy resolution of high purity germanium (HPGe) detector makes it a desirable solution to accurately distinguish the X-ray peaks and determine the...
This report presents two innovative muon detection systems developed by the University of South China for transmission imaging technology. The first system introduces a muon detector employing large-area plastic scintillator four corner coupling PMT for pit exploration methods. The second approach involves the design of a compact muon imaging system utilizing plastic scintillator strips...
