Time Schedule:
Thomas R. Jarboe
A A 523
Seattle Campus
Offered: AWSp.
Class description
AA523 Plasma Diagnostics Professor Jarboe
Measuring the physical properties of plasmas with temperatures from 104oK to 108oK can be very challenging. Only very recently have more or less complete characterization of plasmas in a non-perturbing manner been possible. The course covers the laboratory plasma diagnostics that have been developed to date. Emphasis will be on non-perturbing optical and particle diagnostics although internal magnetic and Langmuir probes will be covered. General control of electrical and digital noise will also be discussed. Optics concepts needed for optimal design of optical diagnostic systems will be included. Presently used methods for measuring electron and ion temperature, plasma density, magnetic field, impurity content, neutral density, and fluctuations will be surveyed. AA 523 (plasma diagnostics) Outline
I. General diagnostic information A. Noise control 1. Electrical noise a. Ground loops b. Capacitive or electrostatic pickup c. Examples i. Voltage divider ii. Magnetic probes 2. digitizing noise a. Aliasing b. Bit noise B. Optics 1. Constancy of brightness 2. Optimizing spatial resolution, temporal resolution, and signal to noise 3. Chord averaged nature of chord measurements 4. Correcting for plasma refraction 5. Image transmission a. Relay or field lens b. fiber optics c. Comparing lenses and fiber optics 6. Optical detectors a. Photo multipliers tubes (PMTs) b. Photo diodes c. Avalanche photo diodes d. Micro-channel plates e. Image convertors II. Measuring Specific Quantities A. Electron temperature 1. Langmuir probe 2. Thomson scattering (TS) 3. Electron cyclotron emission (ECE) 4. Spectroscopy (Line ratios) 5. Plasma resistivity 6. Ionization state (SPRED, Spectrogram) 7. Black body intensity (optically dense) 8. Bremsstrahlung (SiLi and/or foils) B. Ion temperature 1. Impurity Doppler broadening 2. Charge exchange recombination spectroscopy 3. Charge exchange neutrals a. Ionize and energy analyze (NPA) b. Time of flight (TOF) c. Implantation 4. Neutrons a. Production rate b. TOF c. Energy filter 5. Collective scattering a. Gyratron b. Small angle 6. Pressure balance (TS for pe) C. Density 1. Interferometry 2. TS (calibrated) 3. BES 4. Alfven transit time 5. Faraday rotation (on tokamaks) 6. Langmuir probes 7. Line broadening D. Plasma purity 1. Resistivity (and Te)
2. Bremsstrahlung 3. SPRED or Spectroscopy E. Magnetic fields 1. Probes a. Verde material b. Pickup loops 2. Motional Stark effect 3. Faraday rotation 4. TS 5. Grad Shafranov solver 6. Te and Spitzer resistivity in tokamak F. fluctuations 1. Reflectrometry 2. Probes 3. BES 4. Collective scattering 5. Spectroscopy G. Neutrals 1. Charge exchange neutrals 2. Laser Fluorescence Spectroscopy 3. Light absorption H. Reaction products confinement 1. Triton burn up 2. Secondary neutron production 3. NPA I. Particle confinement 1. Pellet density decay 2. Laser blowoff contamination 3. Hydrogen spectroscopy
Student learning goals
General method of instruction
Lecture
Recommended preparation
AA405, Phys543
Class assignments and grading
Team homework
Homework, midterm,and Final
