Temperature and density evolution during decay in a 2.45 GHz hydrogen electron cyclotron resonance plasma: Off-resonant and resonant cases

Journal Article · Sun Sep 15 04:00:00 EDT 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4819875· OSTI ID:22220339

Cortázar, O. D. ^[1]; Megía-Macías, A.; Vizcaíno-de-Julián, A. ^[1]

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1. ESS Bilbao, Edificio Cosimet, Landabarri 2, 48940-Leioa, Vizcaya (Spain)

Time resolved electron temperature and density measurements during the decay stage in a hydrogen electron cyclotron resonance (ECR) plasma are presented for a resonance and off-resonance magnetic field configurations. The measurements are conducted on a ECR plasma generator excited at 2.45 GHz denominated test-bench for ion-sources plasma studies at ESS Bilbao. The plasma parameters evolution is studied by Langmuir probe diagnostic with synchronized sample technique developed for repetitive pulsed plasmas with a temporal resolution of 200 ns in typical decay processes of about 40 μs. An afterglow transient is clearly observed in the reflected microwave power signal from the plasma. Simultaneously, the electron temperature evolution shows rebounding peaks that may be related to the interplay between density drop and microwave coupling with deep impact on the Electron Energy Distribution Function. The correlation of such structures with the plasma absorbed power and the coupling quality is also reported.

• OSTI ID: 22220339
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 84; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DENSITY
ELECTRON CYCLOTRON-RESONANCE
ELECTRON DENSITY
ELECTRON TEMPERATURE
ENERGY SPECTRA
EQUIPMENT
GHZ RANGE 01-100
HYDROGEN
ION TEMPERATURE
LANGMUIR PROBE
MICROWAVE RADIATION
PLASMA DENSITY
RF SYSTEMS
TEMPERATURE MEASUREMENT
TIME RESOLUTION