Compact electron cyclotron resonance plasma source

We have performed a systematic study of the Bremsstrahlung emission from the electrons in the plasma of a commercial 14.5 GHz Electron-Cyclotron Resonance Ion Source. The electronic spectral temperature and the product of ionic and electronic densities of the plasma are measured by analyzing the Bremsstrahlung spectra recorded for several rare gases (Ar, Kr, Xe) as a function of the injected power. Within our uncertainty, we find an average temperature of ≈ 48 keV above 100W, with a weak dependency on the injected power and gas composition. Charge state distributions of extracted ion beams have been determined as well, providing a way to disentangle the ionic density from the electronic density. Moreover X-ray emission from highly charged argon ions in the plasma has been observed with a high-resolution mosaic crystal spectrometer, demonstrating the feasibility for high-precision measurements of transition energies of highly charged ions, in particular of the magnetic dipole (M1) transition of He-like of argon ions.

Section: Evaluation Of the Plasma Characteristics A Bremsstrahlmentioning

confidence: 99%

“…The electron Bremsstrahlung spectra have been used for measuring electronic temperature in the ECRIS plasma [3][4][5][6][7][8][9][10], and high-resolution X-ray spectroscopy has been applied to characterize charge state distribution and electronic density [11][12][13][14]. Results on accurate X-ray spectroscopy, from Ref.…”

Section: Introductionmentioning

confidence: 99%

Electronic temperatures, densities, and plasma x-ray emission of a 14.5 GHz electron-cyclotron resonance ion source

Gumberidze

Trassinelli

Adrouche

et al. 2010

“…It is observed that the a͒ Electronic mail: rb@igcar.ernet.in maximum x rays with energy 100 keV were observed at a distance of 14-18 mm from the axis. In the recent article by Gaudin et al, 25 the evidence of hot electrons leaking in the loss cone of magnetic mirror trap is studied. It should be noted that the ECR x-ray source is operated at a relatively higher pressure ͑7ϫ10 Ϫ5 Torr͒ and the Bremstrahlung spectrum is peaking at 12 keV and it is extending only up to 30 keV.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the ECR technique has been used for the production of x-rays. [22][23][24][25][26][27] The microwave source ͑frequency and power͒ used in ECR plasma x-ray source is similar to that of microwave ion source/plasma deposition systems. It is to be noted that the magnetic field configuration is different in ECR x-ray source compared to other ECR plasma devices and also, here the plasma is produced in a cavity.…”

Section: Introductionmentioning

confidence: 99%

Experimental studies on a compact electron cyclotron resonance plasma x-ray source

Baskaran

Selvakumaran

1999

A compact electron cyclotron resonance plasma x-ray source, which has a potential use for medical imaging is presented in this article. In this article, the experimental system and the characterization studies on plasma and x ray are presented. Using a Langmuir probe, the plasma parameters are measured for different magnetic field profiles and gas pressures. The x-ray spectrum is obtained for various gas pressures and magnetic field profiles. In the x-ray spectrum, the Bremstrahlung radiation, peaking at 20–60 keV is observed and the final energy of the x ray is extended up to ∼200 keV. Thermo luminescence dosimeter (CaSO4 sample) is used for estimating the dose at the port and these results are presented for typical x-ray spectra. Using a teletector, the dose at the port for various coil current is measured and these are compared with the estimated dose obtained from the x-ray spectrum.

“…[8][9][10] In recent years, x-ray source has been made based on ECR technique and the source is called ECR x-ray source. [11][12][13][14][15][16][17][18][19][20] In ECR x-ray source, electrons are accelerated continuously by matching the cyclotron frequency of the electrons to the microwave frequency ͑2.45 GHz͒. After gaining sufficient energy, these electrons collide with the target/cavity wall and produce bremsstrahlung x rays.…”

Section: Introductionmentioning

confidence: 99%

Analysis of x-ray spectrum obtained in electron cyclotron resonance x-ray source

Baskaran

Selvakumaran

Sunny³

2006

The analysis of the x-ray spectrum obtained in electron cyclotron resonance ͑ECR͒ x-ray source is carried out. Assuming single-particle motion, the electron acceleration and its final energy are calculated for TE 111 cylindrical cavity field and uniform external dc magnetic field. In the calculation, initial coordinates of 40 000 electrons were uniformly selected over the central plane of the cavity using random number generator. The final energy of each electron when it hits the wall is stored and the electron energy distribution is obtained. Using the general purpose Monte Carlo N-particle transport code version 4A, the geometry of the ECR x-ray source is modeled. The x-ray energy spectrum is calculated for the geometry model and the numerically calculated electron energy distribution. The calculated x-ray spectrum is compared with the experimentally measured x-ray spectrum.