نتایج جستجو برای: cyclotron radiation
تعداد نتایج: 243782 فیلتر نتایج به سال:
Terahertz photovoltaic detection of cyclotron resonance in the regime of radiation-induced magnetoresistance oscillations Report Title We examine and compare the diagonal magnetoresistance, R-xx, and the photovoltage induced by microwave (42 <= f <= 300 GHz) and terahertz (f >= 300 GHz) photoexcitation in the high mobility quasi-two-dimensional GaAs/AlGaAs system. The data demonstrate strong ra...
It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Although first derived in 1904, cyclotron radiation from a single electron orbiting in a magnetic field has never been observed directly. We demonstrate single-electron detection in a novel radio-frequency spectrometer. The relativistic shift in the cyclotron frequency permits a precise electron ene...
The core of Radiopharmaceuticals Research Centre, CCR, is represented by a TR19 cyclotron (Advanced Cyclotron Systems Inc.), a versatile and fully automated and computer controlled machine. This cyclotron accelerates negative ions (H), on a vertically arranged plane, up to 19 MeV energy, and is provided with two external beam lines and dual extraction capabilities. The main use is for the produ...
A model for EEG as a communication tool of magnetic body is developed. The basic assumption is that communications from cell membrane occur by Josephson radiation inducing the analogs of cyclotron transitions: this leads to resonance conditions forcing the Josephson frequencies to be equal to cyclotron frequencies in the simplest situation. Music metaphorin particular
An analysis of recent free electron laser experiments in combined wiggler and strong axial magnetic fields shows that near resonance, Q,,=kwv,,, the proximity of the cyclotron maser instability precludes an unambiguous identification of the radiation mechanism ( 2,, is the cyclotron frequency in the axial field, kw is the wiggler wavenumber, and v,, the axial electron velocity).
Ion beams from cyclotrons as a source of radiation with extremely high linear energy transfer (LET) are considered. Basic processes of energy dissipation in heavy ion tracks are reviewed and the main parameters characterizing the effects of accelerated heavy ions on matter are given in relation to the effects of low-LET radiation. Modification of polymers by using cyclotron beams is discussed w...
Effective radiation shielding is imperative to safe operation of modern Medical Cyclotrons producing large activities of short-lived radioisotopes on a commercial basis. Like the containment shielding of Medical Linear Accelerators (1), the optimal shielding design of Medical Cyclotrons demands a careful balance between the radiological, economical and often the sociopolitical factors. One is r...
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