MPGD Group, School of Nuclear Science and Technology, Lanzhou University

Research Fields
  • Development of Fast Neutron Imaging Detector based on Mini-Micromegas TPC

  • Crosssection of FNI detector A Fast-Neutron Imaging(FNI) detector based on the Mini-Micromegas TPC(Time Projection Chamber) was proposed and is being developed by Saclay CEA/Irfu and Lanzhou University. Its layout is shown in Fig.1 and Fig.2. In this design, the bulk Micromegas technique will be used to read out a mini-TPC with a 20mm drift length. In order to detect fast neutrons, a converter is needed. Currently, the drift cathode will be coated with a 40 microns polyethylene foil. Fast neutron will knock protons out of this Hydrogen-rich material through the process of elastic scattering. The recoiling protons will then pass through the TPC and leave tracks in it. By detecting and reconstructing the proton tracks, the incidence point of neutrons in the polyethlene foil can be obtained by extrapolation.
    Fig.1. Crossection of FNI Detector.

    3D view of FNI detector The routing of the readout PCB is shown in the Fig.3 in details. The dimensions of its sensitive area (green area) and the readout PCB are 57.4mm X 88.6mm and 365.5mm X 306.0mm, respectively. The sensitive part is composed of 1,728 rectangular pads, 36 pads in the x direction and 48 pads in the y direction. The dimention of each pad is 1.50mm X 1.75mm, and the distance between them is 0.1mm in both directions. All pads will be read out by the AFTER based electronics which is first designed for T2K experiment. The electronics can provide 511 samples at a tunable frequency between 1 and 100MHz for the output signal of each channel. Also, the peaking time of the shaper in the chip can be adjusted between 100ns and 2 micro-second. All of these properties make it suitable for reading out the Micromegas TPC.
    Fig.2. 3D views of FNI Detector.

    Fig.3 Readout PCB of FNI detector. ....Coming soon....

  • Simulation and Development of High Spatial and Time Resolution Alpha Detector

  • Simulation and Development of Muon Tomography System

  • Simulation of Micromegas as a Neutron Imaging Detector

  • Study on the Optical Properties of n-GaN irradiated by the Slow Highly Charged Ions

Research Fundings
  • Development of MPGD
    1. "Development of Micromegas Detector", Director's Foundation of Institute of Modern Physics, CAS, Principal Investigator, Mar. 2006 - Mar. 2008.
    2. "Development of Fast Neutron Imaging Detector Based on Micromegas", National "863" Youth Innovation Funding, Principal Investigator, Nov. 2007 - Jan. 2008.
    3. "Application Study of Micromegas Detector for Fast Neutron Imaging", National Natural Science Foundation of China, Grant No.: 10875054/A0504, Principal Investigator, Jan. 2009 - Dec. 2011.
    4. "Study on the methods for improving the detection efficiency and spatial resolution of Bulk-Micromegas-based fast neutron detector", National Natural Science Foundation of China, Grant No.: 11275087/A0504, Principal Investigator, Jan. 2013 - Dec. 2016.

  • Ion Beam Physics & Applications
    1. "Study on the Changes of Optical Properties and Nano-structure on the Surface of n-GaN Induced by the Slow Highly Charged Ion Beams", Natioanl Natural Science Foundation of China, Grant No.: 10605011, Responsible person, Jan. 2007 - Dec. 2009.

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