Heavy ion beam probe measurement of local electron heating in the Elmo Bumpy Torus

Bieniosek, F. M.; Connor, K. A.
February 1985
Applied Physics Letters;2/15/1985, Vol. 46 Issue 4, p350
Academic Journal
Measurements of the abundance of multiply charged ionization products from a heavy ion beam probing beam have been used as a spatially resolved plasma diagnostic on Elmo Bumpy Torus. Radial profile measurements demonstrate that two classes of electrons are present: those that communicate toroidally to form the core plasma and those that are mirror trapped and depend on local heating (particularly ω = 2Ω[sub ce]) for their existence. Both types show a systematic dependence on resonant heating locations.


Related Articles

  • Narrow conducting channels defined by helium ion beam damage. Cheeks, T. L.; Roukes, M. L.; Scherer, A.; Craighead, H. G. // Applied Physics Letters;11/14/1988, Vol. 53 Issue 20, p1964 

    We have developed a new technique for patterning narrow conducting channels in GaAs-AlGaAs two-dimensional electron gas (2DEG) materials. A low-energy He ion beam successfully patterned narrow wires with little or no etching of the thin GaAs cap. The damage propagation of the He ion even at low...

  • Conductance characteristics of ballistic one-dimensional channels controlled by a gate electrode. Hirayama, Y.; Saku, T. // Applied Physics Letters;6/19/1989, Vol. 54 Issue 25, p2556 

    Ballistic one-dimensional channels are fabricated using a highly resistive region induced by focused Ga ion beam scanning. Both wide and narrow channels are fabricated using this process. Transport characteristics of these channels are controlled by a voltage applied to the Schottky electrode on...

  • Space-charge-limited injection in n[sup +]-i-n[sup +] structures fabricated by a focused ion beam. Hwang, S.W.; Lezec, H.J. // Applied Physics Letters;11/20/1995, Vol. 67 Issue 21, p3159 

    Presents the transport characteristics of n[sup +]-i-n[sup +] structures fabricated by a focused ion beam. Creation of an insulating strip between two-dimensional electron gases; Rise of the current linearly at large biases; Derivation of the charged defect density and the length of the...

  • Dependencies of secondary electron yields on work function for metals by electron and ion bombardment. Kudo, M.; Sakai, Y.; Ichinokawa, T. // Applied Physics Letters;6/5/2000, Vol. 76 Issue 23 

    Secondary electron yields depending on work function were measured for 30 species of metal in ultrahigh vacuum by electron and ion bombardment. Secondary electron yields induced by electrons at 10 keV increase with work function, while those by Ar[sup +] ions at 3 keV decrease with increasing...

  • Electron flow in a relativistic electron beam pinched diode collective acceleration system. Nardi, E.; Markovitz, M.; Zinamon, Z. // Physics of Fluids (00319171);Aug88, Vol. 31 Issue 8, p2373 

    Investigations of the electron component of the composite collectively accelerated ion and electron beam produced in a relativistic electron beam pinch diode are reported. The experiments consisted of examining the K[sub a] x-ray signal induced by the propagating electron beam and comparing this...

  • Limitations of Ion Beam Brightness with Electron Cooling - Theory and Experiment. Parkhomchuk, V. // AIP Conference Proceedings;2002, Vol. 642 Issue 1, p325 

    Electron cooling is used for damping both single particle and coherent oscillations of ion beams. The extremely high phase space density of the cooled ion beam can become a source of stability problems ("electron heating"). For storage rings such as CELSIUS, COSY and the Indiana Cooler, this is...

  • Repetitive high current density pseudospark-produced ion beams. Jain, K.K.; Sharma, P.K. // Applied Physics Letters;3/29/1993, Vol. 62 Issue 13, p1466 

    Examines the operation of multigap pseudospark device filled with hydrogen or argon gas and ejected ion beam characteristics. Reaction of pseudospark during breakdown; Cause of the ion beam increase; Characteristics of pseudospark.

  • Ion sheet beams with parabolic density profiles. Abraham-Shrauner, B.; Anderson, O. A. // Physics of Fluids B: Plasma Physics;Aug92, Vol. 4 Issue 8, p2634 

    A model for a warm nonrelativistic ion sheet beam described by a reduced Vlasov–Maxwell approximation is extended to include parabolic beam densities. A single-humped ion distribution function is found analytically for a stationary beam, whose parabolic density at the beam edge is zero....

  • Relaxation effect of electron inertial delay in an ion-beam plasma system. Dwivedi, C. B.; Prakash, Ram // Journal of Applied Physics;10/1/2001, Vol. 90 Issue 7, p3200 

    In this article an interesting result has been reported to highlight the physical implication of finite nonzero electron inertial delay in acoustic oscillations of an ion-beam plasma system. A simple fluid model has been used to demonstrate the excitation of relaxation type resonant instability...


Read the Article


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

Try another library?
Sign out of this library

Other Topics