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X-ray optimization in Sharif University of Technolgy’s Plasma Focus

Nazmabadi, Mohammad | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43294 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Vosoughi, Naser; Etaati, Gholamreza
  7. Abstract:
  8. In this project we studied Soft and Hard x-ray emissions from Sharif University of Technology’s Plasma Focus (SUT-PF) device filled with Argon gas. SUT-PF is a Mather type plasma focus device ( ). Our expriments have been done in various charging voltages ( ) and various filling pressures. Using different diagnostics X-ray’s intensity in each working condition (voltage and pressure) has been measured and finally these data analysed to find optimum conditions for maximum x-ray production in this device. Used diagnostics was: Rogowski coil, photodiodes combination with ultra thin metal foils, type Plastic scintillation detectors, and pinhole camera. In each shot, time resolved Rogowski coil, photodiodes, and Scintillator detectors signals were recorded by two digital osiloscopes. Combination of Rogowski coil with an integrator circuit gives circuit discharge current. Four photodiodes covered with Cu and Aluminized Mylar in various thicknesses was used for soft x-ray time evolution mesurements. Also two same plastic scintillator detectors in and degrees directions respect to Anode axis direction. A camera with different foils is also used for taking photographes of x-ray production places in different energy ranges. Comparison of experimental data shows that for Argon working gas hard and soft x-rays have a good correlation. It means that conditions for maximum hard and soft x-rays are approximately same. Hard x-rays Anisotropy emitted in and degrees repect to Anode axis is also calculatd for each conditions. We concluded that Anisotropy’s value reduces with increasing filling gas pressure. Pinhole camera images shows that soft x-rays are emitted from structures called Hot spots. In optimum conditions number of this Hot spots increased and this spots approach together. The measured diameter of hot spots was in order of
  9. Keywords:
  10. X Rays ; Plasma Focus ; Pin Photodiodes ; Plastic Scintillator ; Pinhole Camera

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