Dissertation > Excellent graduate degree dissertation topics show

Study on Gain Mechanism and Structural Optimization of X-ray Framing Camera

Author: YangZhiWen
Tutor: XiaoShaLi；LiuShenYe
School: Chongqing University
Course: Instrument Science and Technology
Keywords: Inertial confinement fusion X-ray Framing camera Microchannel plate Secondary electron
CLC: TH74
Type: Master's thesis
Year: 2011
Downloads: 29
Quote: 0
Read: Download Dissertation

Abstract


Physical experiments and diagnostic inertial confinement fusion research, two very important content, the current theory is not perfect, not ideal target fabrication technology, the limited power of the laser device truth, the development of the ICF diagnostic techniques is an important direction for ICF research . The the proximity focusing microchannel plate (MCP) is the core component of the high-speed X-ray framing camera (XFC), provides high accuracy of the temporal and spatial resolution image measurement data is an important basis for the analysis of the ultrafast process has become inertial confinement nuclear fusion (ICF), the high-energy high-density physics (HEDP), Z-pinch (Z-Pinch) standards in the field of diagnostic equipment. Concluded framing camera technology development course at home and abroad on the basis of highlights this more mature, practical fast framing technology - traveling wave strobe-type X-ray framing camera and its basic structure and working principle . Microchannel plate traveling wave strobe-type framing camera core devices, their works, manufacturing processes and structure parameters are described in detail. On this basis, the use of the modular design concept, and optimize the current structural framing camera. While using the method of the pure electronics Quad consistent picosecond pressure strobe test pulse waveform, it is found that the pulse energy is mainly distributed in the 0 to 6GHz frequency range. Passband, the transmission characteristics of the microstrip line on a variety of gradient simulation results show that the Chebyshev multi-cell transformation line and the Klopfenstein impedance gradient line can not only achieve impedance matching of the input and output ends, and also allows the strobe signal low reflection, low-loss along the transmission path. In order to verify the performance of the camera, using a variety of UV light source, the experimental test of the performance of static and dynamic performance of the framing camera, the camera's exposure time parameter (152ps). By monitoring the transmission process of the strobe pulse, the pulse width broadening is caused by the exposure time measuring the value of the main reasons is smaller than the theoretical value, the results can provide important guidance as to improve the time resolution of the cameras. Gain framing camera mechanism for research, modeling and solving analytical method of X-ray framing camera in microchannel plate single hole electronic movement, hitting the wall and a full range of secondary emission process, relying on commercial software Lorentz-2D The energy distribution of secondary electrons early, before the energy distribution of the electron into a wall, the transit time distribution curve, these simulation results provide a theoretical reference for the optimization of the framing camera system designed to improve the performance of the camera. Experimental measurement the static sensitivity curve of the framing camera, comparative study and simulation results show that: photoelectron first collision depth is an important factor affecting camera gain, the gain voltage relationship expressions amended, qualitative analysis of the work bias parameters such as the impact of the first collision depth. By measuring the prototype dynamic gain curve, from the microwave principle analysis of the reasons for the gain reduction, and design experiments to measure the gain attenuation constant.

Related Dissertations

  1. Investigations of Structure and Glass Forming Abilty of Amorphous Alloys,TG139.8
  2. Study on Protective Effects of Apple Polyphenol on Immune System Injury Caused by γ-Ray,S661.1
  3. Screening, Bio-Characteristics and Biopulping Application of a High Pectin-Degrading Baeterial Strain by Ultraviolet-Ray Mutation,TS713
  4. The Clinic Value of Diffusion Weighted Whole Body Imaging with Background Body Signal Suppression (DWIBS) Compared with hPET/CT,R445.2
  5. Assessment of Carotid Atherosclerotic Plaques with Multi-slice Spiral Computed Tomography Angiography and the Correlation of Ischemic Cerebrovascular Disease,R816.1
  6. Spectral CT Characterization of Urinary Calculi : in Vitro Experience,R691.4
  7. The Comparison of Echocardiogram and X-ray on Right Ventricular Pacing Site,R541.7
  8. Research on Interstitial Lung Disorders of the Secondary Pulmonary Tuberculosis in HRCT,R521
  9. Mammographic X-ray analysis of false-negative breast cancer,R737.9
  10. 16 -slice spiral CT MPR technique in the diagnosis of appendicitis clinical value,R656.8
  11. 3.0T high-field magnetic resonance imaging of the central type lung cancer preliminary study,R734.2
  12. Lung cancer and benign lung tumor CT misdiagnosis and control study,R734.2
  13. Blue phosphorescent iridium complex dendritic Design, Synthesis and Properties,O641.4
  14. Nano Pt / SiC Preparation, Characterization and Electrochemical Catalytic Performance,TM911.4
  15. Tetra-tert- butyl- perylene polyhedral micro-nano crystal with XANES and XEOL research,TB383.1
  16. Study of Quality Control of 64-slice CT Coronary Angiography in Diagnosis of Rheumatic Heart Disease Abstract,R816.2
  17. Uniform Image Quality Achieved by Individual Tube Current Modulation in Coronary CT Angiography: Preliminary Study,R816.2
  18. A Study on the Time-Dependent Expression of Caspase-8in Acute β-irradiated Skin Injury in Rats,R818
  19. Research on 3D Visualization Algorithm of Medical Image,TP391.41
  20. The Diagnostic Value of Multi-slice Spiral CT Three-dimensional Reconstructions for Pulmonary Focal Ground-glass Opacity,R734.2
  21. Product Development Research of Rayban Based on Chinese Market,TS959.6

CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments
© 2012 www.DissertationTopic.Net  Mobile