arXiv subjects

Chengbo Du

Publications and source records attributed to Chengbo Du.

3 recordsLinked to original sources

arXiv2025

The throttling refrigeration system for the large cooling power recovery of the PandaX-xT cryogenic distillation system for radon removal

In order to solve the continuous large cooling power supply problem (20 kW) for the radon-removal cryogenic distillation system, which operates at high liquid ffow rate of 856 kg/h (5 LPM) for the dark matter detector PandaX-xT of the next-generation, a throttling refrigeration system based on carbon tetraffuoride (R14) refrigerant for cooling power recovery is designed and developed. According to this system, the cooling power of the liquid xenon in the reboiler of 178K could be transferred to the product xenon cryostat to liquefy the gaseous product xenon by the R14 circulation, thus the liqueffed xenon could return to the detector with the same condition of which extracted from the detector to form a stable cooling cycle and prevent the instability of the detector. A research and development experiment is implemented to validate the feasibility of this large cooling recovery system, using the ethanol to simulate the liquid xenon. Experimental results show that the cooling power recovery of this system could achieve 17 kW with the efffciency of 76.5%, and the R14 ffow rate is 0.16 kg/s. This study realizes the online radon removal distillation with large ffow rate while eliminating the dependence of liquid nitrogen or cryocoolers, which means saving 2414 m3 liquid nitrogen per year or the power consumption of 230 kW. Furthermore, process simulation and optimization of the throttling refrigeration cycle is studied using Aspen Hysys to reveal the inffuences of the key parameters to the system, and the deviation between the simulation and experimental results is < 2.52%.

physics.ins-det↗

arXiv2022

A Gaseous Time Projection Chamber with Micromegas Readout for Low Radioactive Material Screening

Low radioactive material screening is becoming essential for rare event search experiments, such as neutrinoless double beta decay and dark matter searches in underground laboratories. A gaseous time projection chamber (TPC) can be used for such purposes with large active areas and high efficiency. A gaseous TPC with a Micromegas readout plane of approximately 20$\times$20 cm$^2$ is successfully constructed for surface alpha contamination measurements. We have characterized the energy resolution, gain stability, and tracking capability with calibration sources. With the unique track-related background suppression cuts of the gaseous TPC, we have established that the alpha background rate of the TPC is 0.13$\pm$0.03 $μ$Bq/cm$^2$, comparable to the leading commercial solutions.

physics.ins-det↗

arXiv2021

Screener3D: a Gaseous Time Projection Chamber for Ultra-low Radioactive Material Screening

In experiments searching for rare signals, background events from the detector itself are some of the major factors limiting search sensitivity.Screening for ultra-low radioactive detector materials is becoming ever more essential. We propose to develop a gaseous time projection chamber (TPC) with a Micromegas readout for radio screening. The TPC records three-dimensional trajectories of charged particles emitted from a flat sample placed in the active volume of the detector. The detector can distinguish the origin of an event and identify the particle types with information from trajectories, which significantly increases the screening sensitivity. For $α$ particles from the sample surface, we observe that our proposed detector can reach a sensitivity higher than 100 $μ$Bq$\cdot$m$^{-2}$ within two days.

physics.ins-det↗