Trapping and acceleration of hollow electron and positron bunch in a quasi-linear donut wakefield

2017 ◽  
Vol 24 (1) ◽  
pp. 013107 ◽  
Author(s):  
Ali Shekari Firouzjaei ◽  
Babak Shokri
Keyword(s):  
Positron Bunch

scholarly journals PLASMA LENS FOR ELECTRON AND POSITRON BEAMS

2021 ◽  
pp. 70-73
Author(s):  
D.S. Bondar ◽  
V.I. Maslov ◽  
I.N. Onishchenko ◽  
R.T. Ovsiannikov
Keyword(s):  
Electron Bunch ◽  
Plasma Oscillations ◽  
Electron Positron ◽  
Positron Beams ◽  
Positron Bunch

Focusing of both electron and positron bunches in electron-positron collider is necessary. When long electron/positron bunch is injected into the plasma, the focusing force is not uniform but oscillated. It is shown that a long positron bunch after focusing is destroyed faster than an electron bunch due to betatron and plasma oscillations.

scholarly journals All-optical quasi-monoenergetic GeV positron bunch generation by twisted laser fields

2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Jie Zhao ◽  
Yan-Ting Hu ◽  
Yu Lu ◽  
Hao Zhang ◽  
Li-Xiang Hu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Electric Fields ◽  
High Energy Physics ◽  
Energetic Electron ◽  
Three Dimensional ◽  
High Energy ◽  
Electron Positron ◽  
All Optical ◽  
Positron Bunch ◽  
Energy Physics

AbstractGeneration of energetic electron-positron pairs using multi-petawatt (PW) lasers has recently attracted increasing interest. However, some previous laser-driven positron beams have severe limitations in terms of energy spread, beam duration, density, and collimation. Here we propose a scheme for the generation of dense ultra-short quasi-monoenergetic positron bunches by colliding a twisted laser pulse with a Gaussian laser pulse. In this scheme, abundant γ-photons are first generated via nonlinear Compton scattering and positrons are subsequently generated during the head-on collision of γ-photons with the Gaussian laser pulse. Due to the unique structure of the twisted laser pulse, the positrons are confined by the radial electric fields and experience phase-locked-acceleration by the longitudinal electric field. Three-dimensional simulations demonstrate the generation of dense sub-femtosecond quasi-monoenergetic GeV positron bunches with tens of picocoulomb (pC) charge and extremely high brilliance above 1014 s−1 mm−2 mrad−2 eV−1, making them promising for applications in laboratory physics and high energy physics.

A comparison of ultrarelativistic electron- and positron-bunch propagation in plasmas

2006 ◽  
Vol 13 (9) ◽  
pp. 092109 ◽  
Author(s):  
C. T. Zhou ◽  
X. T. He ◽  
M. Y. Yu
Keyword(s):  
Ultrarelativistic Electron ◽  
Positron Bunch

scholarly journals SOURCE OF POSITRONS ON THE BASE OF LINAC LUE-40

2020 ◽  
pp. 7-10
Author(s):  
S.A. Perezhogin ◽  
E.V. Bulyak ◽  
V.A. Kushnir ◽  
V.V. Mytrochenko ◽  
L.I. Selivanov
Keyword(s):  
Angular Distribution ◽  
Optimal Parameters ◽  
Small Energy ◽  
Positron Bunch ◽  
Moderation Process

The results of the numeral studies of the source of positrons for NSC KIPT are presented. The positrons are to produce from conversion of the 40 MeV electrons. The bunches of such electrons will be provided by the linac LUE-40. The estimations of yield of the positrons, their spectrum, and spatial-angular distribution are produced. The possibility of the spectrum modification with help of the RF resonator adjusted to the sub-harmonics of the RF frequency is proposed. It is shown that the use of such device allows to substantially increase the number of positrons with small energy. It allows to promote efficiency of the moderation process and increase yield of the slow mono energetic positrons. The optimal parameters of conversion target have been defined. The preliminary calculations of the system of forming the positron bunch are presented as well.

scholarly journals FINAL-FOCUS SYSTEM AND COLLISION SCHEMES FOR A 5-TeV W-BAND LINEAR COLLIDER

1998 ◽  
Vol 13 (14) ◽  
pp. 2525-2549 ◽  
Author(s):  
F. ZIMMERMANN ◽  
D. H. WHITTUM
Keyword(s):  
Linear Collider ◽  
Charge Compensation ◽  
Spot Size ◽  
Beam Power ◽  
Tight Control ◽  
Interaction Point ◽  
Neutral Beams ◽  
W Band ◽  
Electron Positron ◽  
Positron Bunch

A 3-km long high-gradient W-band switched matrix linac may, in parallel channels, accelerate multiple electron and positron bunches to an energy of 2.5 TeV, with a tight control on the intra-bunch energy spread. In this report, we describe a final-focus system for such an accelerator, whose length is restrained by eliminating chromatic correction. The interaction point (IP) spot size is limited by synchrotron radiation in the last quadrupole (Oide effect). The energy loss due to beamstrahlung is optionally suppressed by combining bunches of opposite charge and colliding the neutral beams. We present two different high-luminosity multiple-collision schemes, which can provide a luminosity of up to 1035 cm -2 s -1, with only about 1 MW average beam power. In the first scheme, batches of equally-charged bunches are combined into superbunches which, possibly after charge compensation, are collided head-on with the opposing beam. In the second scheme, 25 charge-neutral electron-positron bunch pairs of one beam are each collided with 25 neutral bunch pairs of the other beam. These multiplexed collisions are facilitated by a crossing angle and by crab cavities upstream of the electron-positron combiner; however they also require focusing channels (e.g., a crystal) preserving IP beam size between the collision points, a difficult if not impossible construct. We describe the challenges posed by each approach.

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