V. Positron beams
نویسندگان
چکیده
منابع مشابه
Trap-based positron beams
Large numbers of positrons can be accumulated and cooled in a Penning-type trap. These positron clouds can be manipulated and conditioned using plasma physics techniques, before being released from the trap to form high quality positron beams. These techniques offer a qualitatively new method for positron beam formation and manipulation that has significant advantages in efficiency, flexibility...
متن کاملPositron production in crossed beams of bare uranium nuclei.
Positron creation in crossed-beam collisions of high-energy, fully stripped heavy ions is investigated within the coupled-channel formalism. In comparison with fixed-target collisions of highly stripped heavy-ion projectiles positron production probabilities are enhanced by more than one order of magnitude. The increase results from the possibility to excite electrons from the negative energy c...
متن کاملRecent Progress in Tailoring Trap-based Positron Beams
Recent progress is described to implement two approaches to specially tailor trapbased positron beams. Experiments and simulations are presented to understand the limits on the energy spread and pulse duration of positron beams extracted from a Penning-Malmberg (PM) trap after the particles have been buffer-gas cooled (or heated) in the range of temperatures 1000 T 300 K. These simulations are ...
متن کاملHalo formation and emittance growth of positron beams in plasmas.
An ultrarelativistic 28.5 GeV, 700-microm-long positron bunch is focused near the entrance of a 1.4-m-long plasma with a density n(e) between approximately equal to 10(13) and approximately equal to 5 x 10(14) cm(-3). Partial neutralization of the bunch space charge by the mobile plasma electrons results in a reduction in transverse size by a factor of approximately equal to 3 in the high emitt...
متن کاملSingle-bunch Instability of Positron Beams in Electron Cloud
Single-bunch instability of a short and dense positron beam in a photo-electron plasma is studied numerically using code LCODE. The code was originally developed for studies of plasma wakefield acceleration. It is twodimensional and fully relativistic, with both the beam and electrons modelled by macro-particles. The instability is shown to affect the rear part of the beam, right after the arri...
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ژورنال
عنوان ژورنال: RADIOISOTOPES
سال: 1992
ISSN: 1884-4111,0033-8303
DOI: 10.3769/radioisotopes.41.10_543