Anomalous Microwave Radiation at Cyclotron Resonance in Partially Ionized Plasmas

Journal Article · Sun Dec 15 04:00:00 EST 1963 · Journal of the Physical Society of Japan

DOI:https://doi.org/10.1143/JPSJ.18.1810· OSTI ID:4087325

Tanaka, Shigetoshi; Terumichi, Yasushi; Mitani, Kenji; Kubo, Hiroshi

An anomalous microwave radiation from a d c discharge plasma in a magnetic field was observed. The intensity was extremely large compared with that of black body (about 1×10 ⁴ °K) and amounted to the power radiated from the plasma in the thermal equilibrium equivalent to 5.5×10 ⁶ °K in the case of Kr and 1.5×10 ⁶ °K in the case of Xe. This radiation occurred very sharply at cyclotron resonance field, the width being by one order smaller than that of normal cyclotron radiation. The radiation was observed in Xe, Kr and Ar plasmas in the pressure range of 1×10 ^-1 ~5 mmHg, but not in Ne and He plasmas at any pressure. Further, the radiation was observed when the whole tube was placed in a longitudinal magnetic field, but not when only a part of the positive column was immersed in the field. Finally, it is discussed whether this anomalous radiation can be interpreted as a phenomenon of the negative radiation temperature at cyclotron resonance in partially ionized plasmas.

• Research Organization: Kyoto Univ.
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-009488
• OSTI ID: 4087325
• Journal Information: Journal of the Physical Society of Japan, Journal Name: Journal of the Physical Society of Japan Journal Issue: 12 Vol. 18; ISSN 0031-9015
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ARGON
CYCLOTRONS
ELECTRIC DISCHARGES
HIGH TEMPERATURE
IONIZATION
KRYPTON
MAGNETIC FIELDS
MEASURED VALUES
MERCURY
MICROWAVES
PHYSICS
PLASMA
PRESSURE
RADIATIONS
RESONANCE
THERMODYNAMICS
XENON