Twin helical undulator beamline for soft X-ray spectroscopy at SPring-8.
A very high resolution soft X-ray beamline, BL25SU, has been designed and is under construction at SPring-8. Completely right or left circularly polarized light is supplied on a common axis of a newly designed twin helical undulator. A helicity modulation up to 10 Hz can be performed using five kicker magnets. The fundamental radiation covers the region 0.5-3 keV. Higher-order radiation is rather weak on the axis. A monochromator with varied-line-spacing plane gratings is installed to cover the region below 1.5 keV. A very high resolution beyond 10(4) is expected for the whole energy region.
Saitoh
Y
Y
JAERI-RIKEN SPring-8 Project Team, Kamigori, Ako-gun, Hyogo 678-12, Japan.
Nakatani
T
T
Matsushita
T
T
Miyahara
T
T
Fujisawa
M
M
Soda
K
K
Muro
T
T
Ueda
S
S
Harada
H
H
Sekiyama
A
A
Imada
S
S
Daimon
H
H
Suga
S
S