Dissertation > Excellent graduate degree dissertation topics show

The Design and Research of Backscatter Measurements on Shenguang-Ⅲ Facility

Author: XuGuoYa
Tutor: HeJunHua
School: Xi'an Optics and Fine Mechanics
Course: Optical Engineering
Keywords: near backscatter imaging system full aperture backscatter system opticaldesign structural design callibration
CLC: TL632
Type: Master's thesis
Year: 2013
Downloads: 5
Quote: 0
Read: Download Dissertation

Abstract


In the research of inertial confinement fusion (ICF) backscatter caused bylaser-plasma interactions not only reduces absorbability of target with laser energy butalso reduces temperature of radiation field, which affect the coupling efficiency oflaser-plasma interaction. It is important to diagnose backscattered light of power andtemporally resolved spectral measurements precisely for the research of laser-plasmasinteractions. The paper is based on request of physics diagnostic on Shenguang-Ⅲfacility and a backscatter diagnostic system is developed. The system consists of fullaperture backscatter system (FABS) and near backscatter imaging system (NBI),which can measure backscattered lights of scattering into and near the final focusinglens respectively.At first the paper introduces generation mechanism and measurement principleof backscatter. According to design index of Shenguang-Ⅲ facility backscatterdiagnostic system, NBI and FABS are designed. The main optics elements andadjustable facility are analyzed in detail from the point of optics design and structuraldesign.The diagnostic optical system utilizes dichroic splitter to split backscatter intostimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS).Calorimeters, streak camera and fast photodiodes are used to measure power andspectra information of backscatter, the measurement path is symmetric. Due to largespatial distribution of backscattered light, the size of NBI scattered plate is as large asφ1300mm, we design four plates to stitch a full plate. The adjustable facility utilizesfour expansion links, three of them constitute an orthometric adjustable function andthe other is used to fix position, which can realize X、Y、Z and tilt directions adjustof ellipsoidal mirror. FABS utilize off-axis parabolic mirror to collect backscatteredlight, tilt placed of final optics assembly and use of spatial filter can split stray lightand backscattered light.In order to obtain precise measurement data calibration is used to gettransmittance of system.532nm and351nm are chosen to characteristic wavelengthsto simulate SRS and SBS. The beam simulated lens simulate real backscattered lightdistribution, the direction is changed by adjustable facility of turning mirror.CCD monitor system with lens view location of spot, which realizes repeat adjust of spotlocation.At last power and temporally resolved spectral data are obtained from shotexperiments. According to experiment result, the power of backscattered light is thesame essentially of each shot, which prove the system can work stably. From thetemporally resolved spectral information obtained by streak camera, the system canget accurate diagnostic of backscatter. The system provides reasonable physicsdiagnostic method for monitoring coupling of laser-plasma interactions.

Related Dissertations

  1. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3
  2. Design and Analysis of 7-DOF Craniofacial Surgery Mechanical Arm,TP242
  3. Hopper Structure Design and Research of Large Trailing Suction Hopper Dredger,U674.31
  4. A high-power pulse modulator structure design and exploration,TN761
  5. Four leaf micro- gyroscope design and processing technology research,V241.5
  6. Design and Research on Diamond-Ironing Multi-Head Polishing Machine,TS941.56
  7. The Structure Design and Analysis of the Precision Array Grating,TN722
  8. Rail train body shapes with large, complex , precision extrusion dies Development,TG375.41
  9. Maglev mask stage design and performance of the structure,TM574
  10. Research on Dynamic Response and Crack Mechanism of Composite Pavement with Stress Absorbing Layer,U416.2
  11. The Structure and Process Design of Multi-bar Raschel Fabric,TS941.15
  12. A door assembly rigidity Defects and Improvement,TG386
  13. Finite Element Analysis of the Assembly of A Servo Press and the Structure Optimization of the Airframe,TG305
  14. Preliminary Design of Terminal and Switchgear in Power Supply Bureau 10kV and Below Distribution Automation System,TM76
  15. Structural Analysis of Stiffened Thin-walled Rotor Blade for Heavy-lift Helicopter,V224
  16. Structure Design and Accuracy Analysis of Cupped Wave Gyroscope,V241.5
  17. Research on Low Noise Structure and Numnerical Simulation of Inner Flow for Roots Blower,TH444
  18. Study on the Evolution of Qipao Structure Design and Technics,J523.5
  19. The Study on the Shielding Effectiveness and Structural Designing of Anti-electromagnetic Radiation Maternity Dress,TS941.2
  20. Research on Structural Design Factors of Women’s Corset Based on the Pressure and Body Shaping Effects,TS941.717.9
  21. A small aero-engine main combustion chamber structure design technology research,V233

CLC: > Industrial Technology > Nuclear technology > Controlled thermonuclear reactions ( fusion reaction theory and experimental facilities) > Thermonuclear device > Inertial confinement device
© 2012 www.DissertationTopic.Net  Mobile