arXiv subjects

Jianhui Yuan

Publications and source records attributed to Jianhui Yuan.

4 recordsLinked to original sources

arXiv2023

Readout Electronics for CBM-TOF Super Module Quality Evaluation

A super module assembled with MRPC detectors is a component of TOF (Time of Flight) system for the Compressed Baryonic Matter (CBM) experiment. Before the super modules are applied to CBM-TOF, their quality needs to be evaluated. The readout electronics is confronted with a tremendous challenge of transmitting data at the maximal speed of 6 Gbps. In this paper, the readout method for CBM-TOF super module quality evaluation is presented. A parallel architecture based on the Gigabit Ethernet is designed to meet the requirement for data transmission rate. First, the data is sent from the front-end electronics to four readout module groups via optical fibers at the maximal rate of 1.5 Gbps per fiber. Next, the data are further distributed to sixteen parallel daughter readout models so that the maximal data throughput of each daughter readout module is 375 Mbps, within its capacity of 550 Mbps. Finally, the readout daughter modules send data to the data acquisition (DAQ) software through standard Gigabit Ethernet. The proposed readout method has the advantage of good scalability, so it can meet different requirements for variable data rate. The preliminary test result shows that each of four parallel readout groups can transmit data at the speed of 1.6 Gbps, which indicates that the overall readout system can meet the requirement for the maximal data-transmission speed of 6 Gbps.

physics.ins-det↗

arXiv2018

Readout method based on PCIe over optical fiber for CBM-TOF super module quality evaluation

The Compressed Baryonic Matter (CBM) experiment will investigate the quantum chromodynamics (QCD) phase diagram at high net baryon densities and moderate temperatures. CBM Time of Flight (TOF) system is composed of super modules containing high performance Multi-gap Resistive Plate Chambers (MRPCs). During the mass production, each super module assembled with MRPCs needs quality evaluation, which includes time measurement and data readout. Read out electronics encounter the challenge of reading data from a super module at a speed of about 6 Gbps. In this paper, a read out method based on Peripheral Component Interconnect Express (PCIe) over optical fiber is proposed for CBM-TOF super module quality evaluation. The digitized data from super module will be concentrated at the front-end electronics, and then be transmitted to a PCIe switch module (PSM) over optical fiber using PCIe protocol. The PSM is directly plugged into the motherboard via gold fingers at the backend data acquisition server. With this readout method, a high-speed transmission rate can be reached. Furthermore, a PSM can receives data from several super modules simultaneously, which is important to improve the evaluation efficiency. This readout method simplifies the architecture of readout electronics and supports long distance transmission between frontend and backend.

physics.ins-det↗

arXiv2018

Data Acquisition Software for CBM-TOF super module quality control

The time-of-flight (TOF) system in the Compressed Baryonic Matter (CBM) experiment is composed of super modules based on multi-gap Resistive Plate Chambers (MRPC) for high-denseness, high-resolution time measurement. In order to evaluate the quality of detectors during the mass production, a distributed data readout system is developed to meet with the high data rate of 6.4Gbps, and a related data acquisition (DAQ) software is implemented under Linux operating system to test and verify the feasibility of the distributed data readout method. In this paper, the DAQ software is focused on data collection, event building, status monitoring and system controlling. Laboratory tests confirmed the function of the DAQ software and show that the overall data transfer rate of a single data transmission path can reach up to about 550Mbps which already meet the demand.

physics.ins-det↗

arXiv2012

Quantum entanglement and phase transition in a two-dimensional photon-photon pair model

We propose a two-dimensional model consisting of photons and photon pairs. In the model, the mixed gas of photons and photon pairs is formally equivalent to a two-dimensional system of massive bosons with non-vanishing chemical potential, which implies the existence of two possible condensate phases. Using the variational method, we discuss the quantum phase transition of the mixed gas and obtain the critical coupling line analytically. Moreover, we also find that the phase transition of the photon gas can be interpreted as second harmonic generation. We then discuss the entanglement between photons and photon pairs. Additionally, we also illustrate how the entanglement between photons and photon pairs can be associated with the phase transition of the system.

cond-mat.quant-gas↗