Introduction to Positron Beams

For other applications, such as the production and application of intense betatron x-ray radiation, Bremsstrahlung γ-rays and positron beams, the beam’s spectral quality is secondary to the number of electrons produced.

The CEPC booster needs to provide electron and positron beams to the collider at different energy with required injection efficiency.

By colliding (polarized) electron or positron beams with proton or ion beams for a range of center-of-mass energies, the EIC will perform key measurements to investigate quantum chromodynamics (QCD) at the intensity frontier.

Positron annihilation γ-ray energy spectroscopy and positron annihilation lifetime spectroscopy (PALS) based on intense pulsed slow positron beams as well as ellipsometric porosimetry (EP) combined with heptane adsorption were utilized to characterize the open porosity/interconnectivity and pore size distribution for the prepared films.

Incoherent DVCS processes, in particular the ones with tagging the internal target by measuring slow recoiling nuclei, and the unique possibility offered by positron beams for the investigation of Compton form factors of higher twist, are also briefly addressed.

Positrons generated from radioisotopes and from bremsstrahlung pair production by means of highly intense accelerator-based positron beams serve as a microstructure probe allowing material characterizations with respect to chemical, mechanical, electrical, and magnetic properties.

In a previous paper [1] we established the possibility of the advantage of using the bombardment of electron-positron beams to produce commercial electrical energy.

As the key component for the Higgs operating mode of Circular Electron–Positron Collider (CEPC), the electrostatic–magnetic deflectors are required by the double ring collider to separate the electron and the positron beams horizontally in the RF regions.

The cross section was extracted from data taken by the OLYMPUS experiment at DESY, in which alternating stored electron and positron beams were scattered from a windowless gaseous hydrogen target.

The design goal of the positron source is to obtain positron beams with a bunch charge of 3 nC.

But for the positron beams from radioactive sources (such as 22Na and 64Cu) with continuous energy spectrum (from 0 to Emax), the depth profile of defects and terminated position of positrons overlap with each other and this fact indicated that defects measurement in materials will be affected by extra defects produced by positrons.

Utilizing the energetic electron and positron beams of the ILC, we show that the ILC beam dump experiment can cover the parameter regions which have not been explored before.

Numerical simulations of the expected performance of a typical mJ-scale kHz laser demonstrate the possibility of generating narrow-band and ultra-short positron beams with a flux exceeding $10^5$ positrons/s, of interest for fast volumetric scanning of materials at high resolution.

In this paper, the energy released by collision between electron and positron beams is deduced by theoretical analysis, based on the latest experimental results.

We report the observation of charge-neutral MeV electron–positron beams from magnetically collimated laser-driven pair-production experiments.

Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators.

The current design baseline of the FCC-ee injector linac is based on the SuperKEKB scheme, in which the electron and the positron beams share the same linacs with a fixed target configuration on-axis hole for electron beam passage.

Relativistic spin-polarized positron beams are indispensable for future electron-positron colliders to test modern high-energy physics theory with high precision.

High-energy positron beams generated via a multiphoton process have recently been observed too.

The first part of the injector is a normal conducting S-band Linac with frequency in 2860 MHz and provide electron and positron beams at an energy up to 10 GeV [3, 4].

In an exemplary case study, we estimate brilliance of radiation emitted in a Crystalline Undulator (CU) LS by available positron beams.

Polarised electron and positron beams add unique opportunities to the physics reach.

The expected experimental precision of the rates and asymmetries in the Future Circular Collider with electron positron beams (FCC-ee) in the centre of the mass energy range 88-365GeV considered for construction in CERN, will be better by a factor 5-200.

Vacancy-type defects in Mg-implanted GaN were probed using monoenergetic positron beams.

To resolve this problem, we propose a continuous wave (CW) operation of a SC linac shared by electron/positron beams for effective multi-purposes utilization.

Monte-Carlo simulations show that near-term high-intensity laser facilities can produce positron beams with high-current, femtosecond-scale duration, and sufficiently low normalised emittance at energies in the GeV range to be injected in further acceleration stages.

Vacancy-type defects in Mg-implanted GaN and an Al2O3/GaN structure were probed using monoenergetic positron beams.

The proposed gradient magnet is suitable for the detection of low flux and/or monoenergetic type electron/positron beams with finite transverse sizes and offers unparalleled advantages for gamma-ray spectroscopy in the intermediate MeV range.

The process of production of a Higgs boson HSM of the Standard Model (the H , h , and A bosons of the Minimal Supersymmetric Standard Model) and a tt¯$$ \overline{tt} $$ heavy fermion pair in arbitrarily polarized electronpositron beams e−e+→HSMtt¯e−e+→Htt¯e−e+→htt¯ande−e+→Att¯$$ {e}^{-}{e}^{+}\to {H}_{SM}\overline{tt}\left({e}^{-}{e}^{+}\to H\overline{tt},{e}^{-}{e}^{+}\to h\overline{tt}, and\;{e}^{-}{e}^{+}\to A\overline{tt}\right) $$ is investigated.

To measure the electron and positron beams, picking-up these two different bunches in real time is a notable concern.

The dependence of the cross section in both the standard model(SM) and MSSM on the center-of-mass energy is examined by considering the polarizations of the initial electron and positron beams.

Employing a feasible scenario, we show that highly polarized positron beams, with a polarization degree of ζ≈60%, can be produced in a femtosecond timescale, with a small angular divergence, ∼74  mrad, and high density, ∼10^{14}  cm^{-3}.

The CEPC Linac is a normal conducting S-band Linac with frequency of 2860 MHz providing electron and positron beams at an energy up to 10 GeV with 100 Hz repetition frequency.

In the field of positron annihilation spectroscopy, the investigation of a thin near-surface region, modified with ion implantation, has been usually performed by slow positron beams.

To this end, it offers electron/positron beams with user-selectable momenta from 1-6 GeV/c.

In the frame of the compact linear collider project, a high-field short-period superconducting damping wigglers will be required to reduce the emittance of the electron and positron beams.

In the present contribution, we present preliminary ideas on the advantage of using positron beams on fixed target in searching for the \(A'\).

This chapter provides a basic overview of diffraction methods and their applications to determine the structures of surfaces and two-dimensional atomic layers, focusing on the use of electron and positron beams.

The interaction of such electron beams with either a solid target or the focus of a second high-power laser can result in the generation of high-quality positron beams and MeV-photon beams.

The interaction occurring between two counterstreaming rotating electron-positron beams and an inhomogeneous magnetized electron-ion plasma is studied with the focus of research on either positrons or electrons propagating in the direction of the magnetic field.