New Sources

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MOPO-19 Optimization of Gasdynamic ECR Ion Sources 114
 
  • V. Zorin, I. Izotov, V. Skalyga
    IAP/RAS, Nizhny Novgorod
  
  Funding: The work was done under financial support of the ISTC, grant # 2753, the Program PICS CNRS-RFBR, grants # 06-02-22002, and the RFBR, grant #08-02-00531.

The current work is a continuation of the study of gasdynamic ECR ion sources (ReGIS). The main difference of these sources from classical Geller ECR ion sources is the use of the quasi-gasdynamic regime of plasma confinement in magnetic traps. A possibility of ion beam formation in REGIS with total current of 100 mA and higher was demonstrated in *. Such currents are attained due to small longitudinal lifetime in the quasi-gasdynamic regime of confinement. A drawback of ReGIS is low average ion charge. In the current work possible ways of increasing ion charge are demonstrated. Based on the model described in ** a magnetic trap is optimized and microwave radiation power required for producing a preset average charge is analyzed. The computations are compared with data of experiments. A variant of a magnetic trap and microwave pump designed to obtain pulsed beams of Ar+5 and Xe +15 ions with currents of tens of MA was proposed.

* A. Sidorov, M. Dorf, V. Zorin, P. Spadtke, et al. Rev. of Sci. Instrum. 79, 02A317 (2008)
** V. Semenov, V. Skalyga, A. Smirnov, V. Zorin. Rev. of Sci. Instrum. v. 73, #2, p. 635. 2002

 
TUCO-A02 Gasdynamic ECR Sources of Multicharged Ions 128
 
  • V. Skalyga, A. Bokhanov, S. Golubev, I. Izotov, A. Mansfeld, S. Razin, V. Sidorov, V. Zorin
    IAP/RAS, Nizhny Novgorod
  
  А new type of pulsed sources of multicharged ions(MCI), namely, a gasdynamic ECR source is proposed. Its main difference from the classical ECR ion sources is a different, quasi-gasdynamic regime of plasma confinement in a magnetic trap. Plasma was produced and heated by radiation of a pulsed gyrotrons with the frequencies of 37.5 and 75 GHz in magnetic traps of various configurations. Plasma confinement in quasi-gasdynamic regime under such conditions was studied. It was demonstrated that with such a confinement regime it is possible to generate multicharged ions and create intense(more than 1 А/cm2) ion fluxes through the trap plugs. Creation of intense plasma fluxes allows one to extract high-current MCI beams of high brightness. Transverse homogeneity of a plasma flux makes it possible to use a multi-aperture extraction system for the formation of broad intense MCI beams. MCI beams with current up to 150mA and normalized emittance lower than 1 π·mm·mrad were produced. Comparison of results of calculations and data of experiments shows that they are in a good agreement, which allows us to predict creation of a new type of ECR source.  
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