Production of intense low-energy positron beams with synchrotron radiation.
A low-energy positron beam is a unique probe of Fermi surfaces, defects, surfaces and interfaces. In high-energy electron and positron storage rings (E > 6 GeV) it is possible to generate intense synchrotron radiation with 1-3 MeV photons by installing a high-field superconducting wiggler. The strength of the wiggler should be ~8-12 T. High-energy photons are emitted from the wiggler and converted to low-energy positrons by using a suitable target-moderator system. For an 8 GeV electron storage ring at a beam current of 100 mA, final yields are estimated to be ~10(10)-10(12) (slow-e(+) s(-1)) with the size of positron source ~10(2)-10(3) cm(2). The possibility of increasing the brightness of the low-energy positron beam is discussed. Advantages of using synchrotron radiation for producing positrons are pointed out. The effect of a superconducting wiggler on the stored electron beam is also discussed.
Ando
A
A
Belyaev
V N
VN
Daté
S
S
Kamitsubo
H
H
Kiselev
A V
AV
Kulipanov
G N
GN
Kumagai
N
N
Mezentsev
N A
NA
Miyahara
Y
Y
Nakamura
T
T
Skrinsky
A N
AN
Soutome
K
K
Takao
M
M
Tanaka
H
H
Voronchev
I S
IS