問い合わせ番号

INS-0000000364

ABSTRACT

  BL23SU is a soft X-ray undulator beamline of Japan Atomic Energy Agency (JAEA) . It has been constructed for a wide variety of scientific research areas, surface chemistry, biophysical spectroscopy and solid state physics. The experimental stations are located at the experimental hall and the RI building.

AREA OF RESEARCH

• Surface chemistry with supersonic molecular beam
• Biophysical spectroscopy
• Photoelectron spectroscopy (activity at RI laboratory)
• Magnetic circular dichroism (activity at RI laboratory)

KEYWORDS

• Scientific field
  Surface chemistry, Chemical reaction dynamics, Real-time in-situ photoemission spectroscopy (Station 1)
  DNA damages, Transient radical species, Photon stimulated desorbed ions (Station 2)
  Photoelectron spectroscopy, Strongly-correlated electron system, Uranium compounds (Station 3)
  MCD, XAS, Strongly correlated electron system, Magnetic property (Station 4)

SOURCE AND OPTICS

• Light source

    A double-array variable undulator, so-called APPLE-2 (advanced planar polarized light emitter) or Sasaki-type which produces both linearly and circularly polarized soft X-rays is used as a light source. ID23 can generate a linearly (horizontal and vertical plane), an elliptically or a circularly polarized radiation by phase shift. The most unique performance of the undulator is the switching of right-circular-polarization(RCP) and left-circular-polarization (LCP) radiation by periodic phase shift of the magnet rows. The highest mechanical switching rate is at the frequency up to 0.5 Hz.

• Schematic view of beamline and monochromator system

    The main optics is a varied - line - spacing plane grating type (VLSPG) monochromator. This consists of an entrance slit, spherical mirrors, varied-line-spacing plane gratings, an exit slit, a post-focusing mirror, and refocusing toroidal mirrors. The soft X-rays are guided over 120 m from the undulator, crossing the two areas (experimental hall and RI hall).

  Undulator period	120 mm
  Number of periods	16
  Tunable energy range	0.5 ∼ 1.5 keV (Circular polarization)
  Brilliance	3 × 1017 ph/s/mrad2/mm2/0.1%b.w. at 1 keV (Circular polarization, photon energy)

• X-rays at sample

  Energy Range	0.35~ 1.8 keV
  Energy resolution	E/ΔE > 10000
  Photon flux	1011 ph/s/0.02%b.w.
  Beam size	< 0.2 diam.

Fig. 1 The magnetic structure of the APPLE II consists of two pairs of arrays of permanent magnets

Optics : Distance from the source	Optical element	Function
40 m	Cylindrical mirror (Mv)	Vertical focusing at the entrance slit
42.5 m	Cylindrical mirror (Mh)	Deflection and horizontal focusing
50 m	Entrance slit (S1)
60.1 m	Spherical mirror (M1, M2)
61.91 m	Constant deviation monochromator with varied-space plane gratings (VLSPG)	Monochromatizarion
71.91 m	Exit slit (S2)
73.91 m	Cylindrical mirror (M3)	Post focus
114 m	Troidal mirror (M4)	Refocus

EXPERIMENTAL STATIONS

• Surface chemistry experimental station
• Biophysical spectroscopy station
• Photoelectron spectroscopy station
• MCD station

PUBLICATION SEARCH

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CONTACT INFORMATION

Please note that each e-mail address is followed by "@spring8.or.jp."

Yukiharu TAKEDA
Condensed Matter Science Division, Quantum Beam Science and Technology Directorate, JAEA
1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148
Phone : +81-(0)791-58-2604
Fax : +81-(0)-791-58-0311
e-mail : ytakeda