TITLE

Ion acceleration enhanced by additional neutralizing electrons in a magnetically expanding double layer plasma

AUTHOR(S)
Takahashi, Kazunori; Fujiwara, Tamiya
PUB. DATE
October 2010
SOURCE
Physics of Plasmas;Oct2010, Vol. 17 Issue 10, p104505
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Electrons neutralizing an ion beam are additionally supplied to a magnetically expanding double layer (DL) plasma from the downstream side of the DL. The rf power and the argon gas pressure are maintained at 200 W and 55 mPa, respectively, and the source magnetic field is varied in the range of about 70-550 G. It is observed that the ion beam energy corresponding to the DL potential drop increases up to 30 eV with an increase in the magnetic field when supplying the additional electrons, while it saturates at 20 eV for the case of the absence of the additional electrons. The supplied electrons are believed to be an energy source for the DL such that increasing the magnetic field is able to increase the potential drop beyond the limit found in the absence of the supplied electrons.
ACCESSION #
54858431

 

Related Articles

  • Beam focusing in a linear ion accelerator consisting of a periodic sequence of independently phased superconducting cavities. Masunov, E. S.; Samoshin, A. V. // Technical Physics;Jul2010, Vol. 55 Issue 7, p1028 

    Focusing of a low-energy beam of heavy ions in a linear accelerator based on a periodic sequence of independently phased superconducting cavities is considered. The possibility of heavy ion beam focusing by a system of superconducting solenoids is analyzed. The advantages and disadvantages of...

  • Development of a vacuum arc ion source for injection of high current uranium ion beam into the UNILAC at GSI. Hollinger, R.; Galonska, M.; Sp├Ądtke, P. // Review of Scientific Instruments;May2004, Vol. 75 Issue 5, p1595 

    To fill up the GSI heavy ion synchrotron (SIS) to its space charge limit with uranium ions, a vacuum arc ion source, based on the metal vapor vacuum arc (MEVVA) IV ion source, has been developed and implemented into operation. The ion source has proven its capability in several long period beam...

  • Design of improved magnetic channel for superconducting cyclotrons by the random search method. Sarma, P. R. // Review of Scientific Instruments;Aug2003, Vol. 74 Issue 8, p3640 

    Magnetic channels are used in cyclotrons and accelerators for extraction of ion beams. Passive magnetic channels use iron bars to lower the magnetic field locally and set up a field gradient. In order that the beam quality does not deteriorate, this field gradient should be highly uniform. We...

  • Plane and hemispherical potential structures in magnetically expanding plasmas. Takahashi, Kazunori; Igarashi, Yuichi; Fujiwara, Tamiya // Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041501 

    Two-dimensional potential structures are measured for different gas pressure in expanding argon plasma using permanent magnets, where the magnetic field is about 100 G in the source and several gauss in the diffusion chamber. The plane potential drop is observed near the source exit for 0.35...

  • Stability Studies under Dipole Oscillation Model for RHIC E-Cooling. Gang Wang // AIP Conference Proceedings;2006, Vol. 821 Issue 1, p164 

    In the presence of the electron beam in the cooling solenoid, both longitudinal and transverse instability could take place for the circulating Au beam. A threshold of the electron beam density has been derived for RHIC gold ion beam longitudinal instability to take place. The transversal...

  • Xenon ion beam characterization in a helicon double layer thruster. Charles, C.; Boswell, R. W.; Lieberman, M. A. // Applied Physics Letters;12/25/2006, Vol. 89 Issue 26, p261503 

    A current-free electric double layer is created in a helicon double layer thruster operating with xenon and compared to a recently developed theory. The Xe+ ion beam formed by acceleration through the potential drop of the double layer is characterized radially using an electrostatic ion energy...

  • Production of high-energy electrons caused by counterstreaming ion beams in an external magnetic field. Abe, Takashi; Machida, Shinobu // Physics of Fluids (00319171);Apr85, Vol. 28 Issue 4, p1178 

    A mechanism for producing suprathermal electrons having energies comparable to ion beam energy is studied by a numerical simulation. The system consists of background ions and electrons and a beam flowing across the magnetic field. The time scale considered is less than the ion gyro period, so...

  • Fabrication of an optimized hexapole magnet for a 14.5 GHz electron cyclotron resonance ion source. Byung-Hoon Oh; Chang Seog Seo; Sang-Ryul In; Tae-Seong Kim // Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02A317 

    A hexapole magnet for a 14.5 GHz electron cyclotron resonance (ECR) ion source, where the maximum radial field on the wall of the plasma chamber is higher than 1.1 T, has been designed and fabricated. The size of the outer diameter and the number of the sector of the hexapole are optimized for a...

  • Experiments and theory of an upstream ionization instability excited by an accelerated electron beam through a current-free double layer. Aanesland, A.; Lieberman, M. A.; Charles, C.; Boswell, R. W. // Physics of Plasmas;Dec2006, Vol. 13 Issue 12, p122101 

    A low-frequency instability varying from 10 to 20 kHz has been discovered in the presence of a current-free double layer (DL) in a low-pressure expanding helicon plasma. The instability is observed using various electrostatic probes, such as Langmuir probes floating or biased to ion saturation...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics