Efficient propagation of polarization from laser photons to positrons through compton scattering and electron-positron pair creation.
We have demonstrated for the first time the production of highly polarized short-pulse positrons with a finite energy spread in accordance with a new scheme that consists of two-quantum processes, such as inverse Compton scattering and electron-positron pair creation. Using a circularly polarized laser beam of 532 nm scattered off a high-quality, 1.28 GeV electron beam, we have obtained polarized positrons with an intensity of 2 x 10(4) e+ /bunch. The magnitude of positron polarization has been determined to be 73 +/- 15(stat) +/- 19(syst)% by means of a newly designed positron polarimeter.
Omori
T
T
KEK: High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki 305-0801, Japan.
Fukuda
M
M
Hirose
T
T
Kurihara
Y
Y
Kuroda
R
R
Nomura
M
M
Ohashi
A
A
Okugi
T
T
Sakaue
K
K
Saito
T
T
Urakawa
J
J
Washio
M
M
Yamazaki
I
I