By R. Miller
An severe charged particle beam should be characterised as an geared up charged particle stream for which the results of beam self-fields are of significant value in describing the evolution of the move. learn using such beams is now a speedily starting to be box with very important purposes starting from the advance of excessive energy assets of coherent radiation to inertial confinement fusion. significant courses have now been tested at numerous laboratories within the usa and nice Britain, in addition to within the USSR, Japan, and several other jap and Western ecu international locations. furthermore, similar study actions are being pursued on the graduate point at numerous universities within the US and in another country. whilst the writer first entered this box in 1973 there has been no unmarried reference textual content that supplied a wide survey of the real subject matters, but contained adequate element to be of curiosity to the lively researcher. That scenario has persevered, and this publication is an try and fill the void. As such, the textual content is geared toward the graduate pupil, or starting researcher; although, it comprises considerable info to be a handy reference resource for the complex worker.
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Extra resources for An Introduction to the Physics of Intense Charged Particle Beams
27) In the following sections Eq. 27) will be applied to several cases of practical importance. Although these cases will be examined in great detail 11 Chap. 1 • Introduction in subsequent chapters, the envelope equation analysis will give a good qualitative understanding of the behavior of intense charged particle beams. 1. Solenoidal Field Transport in Vacuum Consider the case of an intense beam propagating in vacuum with constant axial velocity vo along a longitudinal magnetic field. The beam kinetic energy is also assumed to remain constant.
As more and more electrons enter the gap a potential minimum can form outside the cathode surface (curve III), and only those electrons which possess an initial energy greater than the maximum height of the barrier (due to electron thermal spread in the cathode plasma) can escape from the cathode and reach the anode. Finally, the condition is reached when most of the electrons which leave the cathode surface are reflected by the potential barrier (curve IV). Since the applied field causes those electrons which pass the barrier to leave the interelectrode space, the barrier breaks down (curve V) and the process repeats.
70) does indicate the appropriate scaling, I ~ q,~/2, in the nonrelativistic limit. Although the assumption of space-charge-limited emission over the entire cathode surface is a drastic one, the analysis nevertheless indicates the essential features of foilless diode behavior, including the suppression of electron emission at interior cathode regions due to the beam space charge. Further, as the emitting cathode region nears the anode wall, the beam current rapidly increases. 4. 33 The success of these new methods depends largely on the degree of control or modification of the electron distribution in the high-voltage diode gap.
An Introduction to the Physics of Intense Charged Particle Beams by R. Miller