Introduction to Positron Beam

We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps.

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.

We discuss two complementary strategies to search for light dark matter (LDM) exploiting the positron beam possibly available in the future at Jefferson Laboratory.

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 the Low EMittance Muon Accelerator concept a 45 GeV positron beam, stored in an accumulation ring with high energy acceptance and low angular divergence, is extracted and driven to a target system in order to produce muon pairs near the kinematic threshold.

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.

Beam pipe, which lies at the centre of the second-generation Beijing Electron Positron Collider (BEPC II) and its detector Beijing Spectrometer III (BES III), is made of beryllium and the electron–positron beam collision occurs in it.

1 GeV damping ring is used to reduce the transverse emittance of positron beam.

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.

Here we show that the preservation of beam quality can be compromised in a plasma wakefield loaded with a positron beam, and a trade-off between energy efficiency and beam quality needs to be found.

However, microstructural defects induced by ion implantation can be effectively investigated using various spectroscopic techniques, including slow-positron beam spectroscopy.

A high precision proton radius measurement could be performed in Hall B at Jefferson Lab with a positron beam and the calorimeter based setup of the PRad experiment.

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.

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 show that after a short propagation distance, an asymmetric electron beam drives a stable wakefield in a hollow plasma channel that can be both accelerating and focusing for a positron beam.

1 GeV ring and two transport lines is introduced in CEPC linac in order to reduce the transverse emittance of positron beam at the end of linac and hence reduce the beam loss in the booster.

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.

These characteristic signals are attributed to the inverse two-plasmon decay of the counterpropagating monochromatic plasma waves which are excited by the energetic electrons and the positron beam accelerated by the laser.

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.

The baseline design of CEPC Linac is a normal conducting S-band linear accelerator with frequency in 2860 MHz, which can provide electron and positron beam at an energy up to 10 GeV and bunch charge up to 3 nC.

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

Temperature rises of a reactor-based slow-positron beamline at Kyoto University Research Reactor (KUR) were measured during reactor operation and solenoid-coil excitation.

We further show that using electron/positron beam polarizations can significantly improve the signal sensitivities.

The primary purpose of CEPC damping ring is to reduce the transverse phase spaces of positron beam to suitably small value at the beginning of linac and hence reduce the beam loss in the booster.

The design concept of the system is discussed, along with the chosen engineering solutions and some experimental results obtained during the operation of the system prototype using a positron beam with energies of 100–300 MeV from the PAKHRA S-25R synchrotron at the Lebedev Physical Institute.

In the LTR commissioning, the positron beam with high emittance, wide energy spread, and high charge were transported and injected into the DR.

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.

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.

Further, the realistic electron and positron beam polarization are taken into account to measure the NC parameters.

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.

PADME (Positron Annihilation into Dark Matter Experiment) is an experiment that will search for the production of a dark photon A ′ from the annihilation of a positron beam on a thin diamond target.

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.

The positron beam with energies 100-300 MeV was used for calibration of prototypes of GAMMA-400 detectors on synchrotron “PAKHRA”.

To achieve the design luminosity, the beam have to be transported to the SuperKEKB main ring with the high bunch charge (4 nC) and low emittance: 40/20 μm for horizontal/vertical electron beam emittance and 100/15 μm for positron beam emittance in Phase 3 final.

A relativistic electron-positron beam propagating through a magnetized electron-ion plasma is shown to generate both circularly and linearly polarized synchrotron radiations, which is intrinsically linked with asymmetric energy dissipation of the pair beam during the filamentation instability dynamics in the background plasma.