A Method to Produce Intense Positron Beams via Electro Pair Production on Electrons

Abstract

Intense positron beams can be prepared via electro production with the reaction $e^{-}+e^{-}\to e^{-}+e^{+}+e^{-}+e^{-}$ due to the availability of high current electron beams. Head on collisions inside of a magnetic field of a solenoid are used to produce unpolarized/polarized positrons via $e^{-}-e^{+}$ - pair production. A flux of unpolarized positrons, $N_{positron}=6.55\cdot 10^{11}{s}^{-1}$, has been obtained as a result of calculations for a special case of parameters with beam currents for both electron beams of $I_e$=10 mA and beam momenta of $p_{beam1}$=0.63 MeV/c and $p_{beam2}$=10.0 MeV/c. Intensities are an order of magnitude smaller in the case of polarized positrons due to a reduced current of one of the electron beams. Suitable cuts on momenta of the positrons allow to achieve a polarization transfer from electrons to positrons of $\ge$ 85\% reducing, however, the intensity to 27\%

14 Pages,9 Figures

References in corpus (1)

• Demonstration of Cathode Emittance Dominated High Bunch Charge Beams in a DC gun-based Photoinjector