HiSOR
ACTIVITY REPORT2018

Hiroshima Synchrotron Radiation Center, HiSOR
Hiroshima University

Edited by Y. Izumi
The annual report is available from
Hiroshima Synchrotron Radiation Center, Hiroshima University
Kagamiyama 2-313, Higashi-Hiroshima 739-0046, JAPAN
Phone: +81-82-424-6293
Fax: +81-82-424-6294
e-mail: hisor@hiroshima-u.ac.jp
URL: http://www.hsrc.hiroshima-u.ac.jp/

Preface

The Hiroshima Synchrotron Radiation Center was inaugurated in 1996, as part of theacademic policies of the Ministry of Education, Culture, Sports, Science and Technology(MEXT). A compact 700MeV electron-storage ring, called HiSOR (this center is often referred
as HiSOR), produces synchrotron radiation in the range of ultraviolet and soft x-ray. The
mission of the center is to promote advanced research in the field of condensed matter physics
including interdisciplinary fields using synchrotron radiation, as well as to develop humanresources making the most of the international research environment established in the national
university. In FY2010, the center was authorized as a “Joint Usage / Research Center” by the
MEXT for six years, and the authorization was extended until FY2021, in 2016.
In FY2018, the real number of HiSOR users amounted to 228 (Hiroshima University: 84,
domestic institutes: 80, foreign institutes: 64). We have accepted 127 proposals including 36
proposals from outside Japan. Detailed scientific results are reported in this volume.
It is our great pleasure to note that Dr. Koji Miyamoto, an assistant professor of HiSOR,
has received a commendation by the Minister of Education, Culture, Sport, Science andTechnology for his outstanding achievements in spin-resolved photoemission studies of
topological surface states. Furthermore, Dr. Shunya Matsuba, an assistant professor of HiSOR,
has received a Young Scientist Award of the Physical Society of Japan for his work on thegeneration of vector beam with tandem helical undulators, which has been done incollaboration with the Institute of Molecular Science and Nagoya University.
From Oct. 4 to Oct. 6, 2018, we hosted the International Workshop on Trends in Advanced
Spectroscopy in Materials Science (TASPEC) in the campus of Hiroshima University. The
scope covered a broad range of experimental and theoretical hot topics of gas-phase molecules,
liquids, solids and their surfaces/interfaces studied by various spectroscopic methods such as
photoelectron spectroscopy, x-ray absorption spectroscopy, operand and/or in situ microscopy,
and time-resolving techniques. The program consistsed of 20 invited talks, 14 contributed talks,
and 45 posters. 110 participants from 11 countries attended the workshop and actively
discussed the latest scientific results.
During FY2018, two distinguished visiting professors stayed at HiSOR. Prof. Junfeng
He from the University of Science and Technology of China stayed one month to promote highresolution angle-resolved photoemission study of correlated materials. Prof. Nikolai Sokolov
from the Ioffe Physical-Technical Institute, Russian Academy of Sciences stayed three months– ⅰ –to develop a soft x-ray reflection spectrometer on the beamline BL-14, and to run soft x-ray
MCD studies on functional thin films grown in his laboratory.
In closing, I would like to thank all the staff members for their great efforts to operate
HiSOR, and to maintain and advance experimental stations. I also want to thank ourstudents and collaborators for their excellent scientific achievements, making full use of
our facilities. Finally, I deeply appreciate the continued supports by Hiroshima University
and the MEXT.

July 2019

Kenya Shimada
Director of Hiroshima Synchrotron Radiation Center– ⅱ –Table of Contents
Preface
Current Status of HiSOR
Status of the HiSOR storage ring ..............................................................................................1
Beamlines .......................................................................................................................................4

Future Plan of HiSOR
Design study of an electron storage ring for the future plan of Hiroshima Synchrotron
Radiation Center ...........................................................................................................................7
S. Matsuba, K. Shimada, M. Katoh, K. Kawase, K. Harada

Research Activities―Accelerator Studies―
Vector beam generation with tandem helical undulators in UVSOR.................................9S. Matsuba, K. Kawase, A. Miyamoto, S. Sasaki, M. Fujimoto, T. Konomi, N.
Yamamoto, M. Hosaka, M. Katoh―Synchrotron Radiation Experiments―
Electrical tuning of the excitonic insulator ground state of Ta2NiSe5.............................. 11
K. Fukutani, R. Stania, J. Jung, E. F. Schwier, K. Shimada, C. I. Kwon, J. S. Kim, H.
W. Yeom
Electronic structure and H-T phase diagram of Eu(Fe1-xRhx)2As2 ...................................12
S. Xiao, D. C. Peets, Y. Feng, W. –H. Jiao, E. F. Schwier, K. Shimada, S. He
Interplay of exchange and spin-orbit interaction for interface states in Ni/W(110) ...15
M. Donath, P. J. Grenz, E. F. Schwier, K. Miyamoto, T. Okuda
Matrix elements in the resonant photoemission from cerium oxide ................................17
T. Duchoň, D. N. Mueller, S. Kumar, E. F. Schwier, S. Nemšák
Superstructure-induced splitting of Dirac cones in silicene ..............................................19
B. Feng, H. Zhou, Y. Feng, H. Liu, S. He, I. Matsuda, L. Chen, E. F. Schwier, K.
Shimada, S. Meng, K. Wu– ⅲ –ARPES measurements on thin films of topological crystalline insulator PbxSn1-xTe...23
Y. Tomohiro, H. Ito, T. Shimano, R. Akiyama, E. F. Schwier, A. Kimura, K. Shimada,
S. Hasegawa, S. Kuroda
ARPES study of the evolution of electronic structures of Yb-doped SmB6...................25
S. Xiao, Y. Feng, T. Wu, E. F. Schwier, K. Shimada, S. He
The ARPES studies on nodal-line semimetal LaSbTe ........................................................27
Y. Wang, W. Zhao, G. Liu, E. F. Schwier, K. Shimada, X. Zhou
Excitonic correlation effect in multi-band superconductors ..............................................29
T. Mizokawa, Y. Matsuzawa, T. Morita, N. L. Saini, T. Asano, T. Nakajima, R.
Higashinaka, T. D. Matsuda, Y. Aoki, E. F. Schwier, K. Shimada
The electronic structure investigation on Pd doped SrIrO3 thin film ...............................31
T. Komesu, P. E. Evans, A. J. Yost, E. F. Schwier, K. Shimada, L. Zhang, X. Hong,
P. A. Dowben
Current activities of research and education on BL-5 (FY2018) ....................................33
T. Yokoya, T. Wakita, Y. Muraoka, K. Terashima
Development on on-site cleaning method of carbon contamination with atomic
hydrogen .......................................................................................................................................34
M. Niibe, T. Tokushima, T. Kono, Y. Hashimoto, Y. Horikawa, H. YoshidaEx-situ/in-situ soft X-ray absorption investigation towards corrosion of Cu andpassivation behavior of Ti .........................................................................................................36
Y. Jin, Q. Wang, F. –F. Huang, Y. –T. Cui, H. Yoshida, T. Tokushima
Photoelectron spectroscopy of YbCux systems ....................................................................38
H. Yamaoka, H. Sato, N. Tsujii, K. Shimada
Observation of singly occupied molecular orbital in 2-iodo nitronyl nitroxide radical........................................................................................................................................................40

H. Anzai, Y. Ono, R. Takakura, H. Sato, T. Matsui, S. Noguchi, Y. Hosokoshi
Photoelectron spectroscopy of Yb4TGe8 (T = Cr, Mn, Fe, Ni) ........................................42
H. Yamaoka, H. Sato, M. Hikiji, S. Yamanaka, C. Michioka, N. Tsujii, K. Shimada,K. Yoshimura
Electronic structure of Mn3Sn investigated by angle-resolved photoemission..............44
S. Wu, M. Arita, K. Sumida, K. Miyamoto, H. Sato, T. Okuda
Elucidation of the electronic band of germanene superperiodic structure ......................46
O. Kubo, S. Kinoshita, H. Sato, T. Okuda
Photoemission spectroscopy study for half-metal Heusler compounds ..........................48
K. Goto, Y. Sakuraba, H. Sato, K. Hono

– ⅳ –Photoelectron spectroscopy of thin-film beta tungsten .......................................................50
H. T. Lee, H. Yamaoka, A. Nagakubo, H. Sato
Angle resolved photoemission study of Sm1-xYbxB6...........................................................52
M. Arita, H. Sato, K. Shimada, H. Namatame, M. Taniguchi, H. Tanida, Y. Osanai,
K. Hayashi, F. Iga
Linear polarization dependence of angle resolved photoemission study on SmB6 ......53
M. Arita, H. Sato, K. Shimada, H. Namatame, M. Taniguchi, H. Tanida, Y. Osanai,
K. Hayashi, F. Iga
Probing bulk kz dispersion of a correlated semimetal CeSb by low hν ARPES ............54
K. Kuroda, S. Akebi, R. Noguchi, S. Kunisada, M. Arita, H. Kitazawa, S. Shin, H.
Suzuki, T. Kondo
Semiconductor to metal transition and spin-orbit coupling in boron doped graphene
nanoribbons ..................................................................................................................................56
A. Grüneis, B. Senkovskiy
High-resolution ARPES study of Ca3Ru2O7 .........................................................................57
D. Ootsuki, A. Hishikawa, Y. Takasuka, D. Shibata, Y. Shinya, N. Kikugawa, M.
Arita, H. Tamatame, M. Taniguchi, T. Yoshida
ARPES study on the new candidate Weyl semimetal in XSi (X = Co, Rh) .................59
C. Li, J. Huang, D. Wu, W. Wu, G. Liu, J. Luo, K. Shimada, X. Zhou
Electronic correlation effect in electron-hole systems with orbital degeneracy ............61
T. Mizokawa, R. Matsumoto, T. Mitsuoka, T. Shimaiwa, N. L. Saini, R. Jha, R.
Higashinaka, T. D. Matsuda, Y. Aoki, and M. Arita
Electronic structure of electron-doped J = 1/2 Mott insulators .........................................63
Y. Hu, Z. Wei, J. He
Photoemission study of mechanical polished FeSi [111] surface .....................................65
M. Arita, K. Shimada, T. Kanomata
Electronic structure of van der Waals ferromagnet Fe3GeTe2 ...........................................67
X. Xu, Y. J. Chen, L. X. Wang, Y. L. Chen
Multiple topological states in iron-based superconductors ................................................69
P. Zhang, Y. Ishida, K. Sumida, S. Wu, K. Miyamoto, T. Okuda, S. ShinExperimental observation of node-line-like surface states in LaBi .................................71
B. Feng, J. Cao, M. Yang, Y. Feng, S. Wu, B. Fu, M. Arita, K. Miyamoto, S. He, K.
Shimada, Y. Shi, T. Okuda, Y. Yao
Observation of bulk and surface spin-orbital textures in nonsymmorphic NbGeSb ....74
I. Marković, O. Clark, S. Wu, T. Okuda, K. Murphy, J. Alaria, P. King– ⅴ –Spin-resolved photoemission studies on possible half-metallic SrRu3 thin film...........75
H. Ryu, S. Das, B. Kim, C. Kim, T. Okuda
Spin resolved Dirac cone surface state in trigonal layered PtBi2 .....................................77
Y. Feng, S. Xiao, K. Shimada, S. He
Electronic and spin structure of Bi-graphene-like system..................................................79
V. A. Golyashov, A. Kimura, T. Okuda, O. E. Tereshchenko
Spin polarized electronic structure of metal overlayers on magneto-electric Cr2O3 ....80
T. Komesu, M. Kakoki, T. Okuda, K. Miyamoto, P. E. Evans, P. A. Dowben
Insight into the spin-texture of Shockley and Dirac states handling by competitive spinorbit and exchange magnetic interactions in GdRh2Si2, HoRh2Si2, GdIr2Si2, and
YbIr2Si2 materials .......................................................................................................................82
D. Vyalikh, D. Usachov, G. Poelhen, A. Santander-Syro, T. Imai, K. Miyamoto, T.
Okuda
Spin structure of the gapped Dirac cone of first antiferromagnetic topological insulator
MnBi2Te4 ......................................................................................................................................84
I. I. Klimovskikh, S. Filnov, D. Estyunin, A. M. Shikin
Spin-resolved photoemission spectroscopy study for half-metal Heusler compounds........................................................................................................................................................86

K. Goto, Y. Sakuraba, M. Kakoki, T. Kono, T. Okuda, K. Hono
Identifying sulfur species adsorbed on particulate matters in exhaust gas emitted froma container carrier .......................................................................................................................88
S. Asaoka, T. Dan, S. Hayakawa
Sulfur K-edge XAFS analysis of aqueous solutions of sulfur compounds using an insitu liquid flow cell .....................................................................................................................89
D. Nishino, A. Doi, K. Komaguchi, S. Hayakawa
Polarization dependence of S K-edge XAFS spectra from polythiophene thin films ..91
Y. Hamashima, K. Fukuda, D. Kajiya, K. Saitow, A. Mori, K. Komaguchi, J. Ohshita,
S. Hayakawa
Identification of sulfur species in road dust collected from emerging countries in Asia........................................................................................................................................................93

W. A. Jadoon, S. Asaoka, L. Liao, S. Hayakawa
Efficient photocatalytic activation of C-H bonds by spatially controlled chlorine andtitanium on the silicate layer ....................................................................................................94
N. Tsunoji, H. Nishida, K. Komaguchi, S. Hayakawa, Y. Yagenji, M. Sadakane, T.
Sano

– ⅵ –

Conformation analysis of chitin by vacuum-ultraviolet circular dichroism spectroscopy........................................................................................................................................................96

K. Matsuo
Structural change of DNA repair protein XRCC4 by phosphorylation at c-terminal
revealed by VUV-CD .................................................................................................................97
K. Nishikubo, M. Hasegawa, Y. Izumi, K. Fujii, K. Matsuo, Y. Matsumoto, A.
YokoyaCircular dichroism analysis of optical activity emergence in amino-acid thin films
irradiated by vacuum-ultraviolet circularly-polarized light ...............................................99
J. Takahashi, T. Sakamoto, Y. Izumi, K. Matsuo, M. Fujimoto, M. Katoh, Y.
Kebukawa, K. Kobayashi
VUVCD measurement of lysine-36 trimethylated histone H3 protein (H3K36me3)......................................................................................................................................................101

Y. Izumi, K. Matsuo
Study on structural changes of histone core proteins in Arabidopsis after gamma
irradiation ...................................................................................................................................103
J. –H. Kim, T. –H. Ryu, Y. Izumi
Effects of mono-saccharides on structural stability of apo-myoglobin investigated by
VUVCD spectroscopy .............................................................................................................105
T. Shimizu, M. Kumashiro, Y. Izumi, K. Matsuo
Vacuum-ultraviolet circular dichroism of sucralose ..........................................................106
Y. Maki, K. Matsuo
Secondary-structure analysis of DNA gyrase inhibitor derived from Staphylococcus
aureus by vacuum-ultraviolet circular-dichroism spectroscopy .....................................108
F. Kato, K. Matsuo
Spectrum measurement of human de novo evolved gene product NCYM using
vacuum-ultraviolet circular dichroism ................................................................................. 110
T. Matsuo, Y. Suenaga, K. Matsuo, T. Tamada
Ultrafast charge transfer dynamics on partially fluorine-substituted aromaticmonolayers analyzed by Auger electron spectroscopy ..................................................... 111
S. Wada, Y. Iyobe, A. Hiraya
Ion desorption measurements using pulsed HV time-of-flight mass spectrometer at
HiSOR ......................................................................................................................................... 113
K. Yamamoto, A. Hiraya, S. Wada– ⅶ –Study toward time-of-flight mass spectrometry of Ion desorption following inner-shell
excitation of molecules adsorbed on a surface ................................................................... 115
Y. Hikosaka, H. Shimada, S. Wada
Soft X-ray spectroscopies for Br-incorporated DNA nucleotide .................................... 117
M. Hirato, K. Fujii, A. Yokoya, S. Wada, Y. Baba
X-ray absorption spectroscopy of YbCux at Cu-L3 absorption edge .............................. 118
H. Yamaoka, N. Tsujii, M. Sawada, K. Shimada
Development a soft X ray reflectometer in a low vacuum environment at HiSOR-BL14......................................................................................................................................................120

T. Mayumi, Y. Ohashi, N. Ichikawa, M. Sawada
Magnetic properties of Co ultrathin films intercalated underneath monolayer h-BNgrown on Ni(111) probed by soft-X-ray magnetic circular dichroism ..........................122
Y. Ohashi, N. Ichikawa, T. Mayumi, M. Sawada
Antiferromagnetic coupling at the interface of Co/h-BN/Ni(111) studied by soft X-ray
magnetic circular dichroism ...................................................................................................123
N. Ichikawa, Y. Ohashi, T. Mayumi, M. Sawada, A. Kimura
Cation distribution and magnetic properties of NiFe2O4 nanofilms on MgO and SrTiO3
substrates: XAS and XMCD soft X-ray studies .................................................................125
A. K. Kaveev, A. G. Banshchikov, N. S. Sokolov, M. Sawada
Investigation of multi-mode spin-phonon coupling and local B-site disorder inPr2CoFeO6 by Raman spectroscopy and correlation with its electronic structures by
XPS and XAS studies ..............................................................................................................127
A. Pal, S. Ghosh, A. G. Joshi, S. Kumar, S. Patil, P. K. Gupta, P. Singh, V. K.
Gangwar, P. Prakash, R. K. Singh, E. F. Schwier, M. Sawada, K. Shimada, A. K.
Ghosh, A. Das, S. Chatterjee―Off-line Experiments―
Study of ARPES, magnetic and magneto-transport properties of Dy-doped Bi2Te3
topological insulator .................................................................................................................129
S. Kumar, V. K. Gangwar, Y. Zhang, P. Shahi, S. Patil, E. F. Schwier, K. Shimada, Y.
Uwatoko, S. Chatterjee
Nodal gap in electron-doped J = 1/2 Motto insulators ......................................................130
Y. Hu, Z. Wei, J. He
ARPES studies of ultrathin ferromagnetic films on topological insulators for spintronic
applications ................................................................................................................................132
A. K. Kaveev, O. E. Tereshchenko, V. A. Golyashov, E. F. Schwier– ⅷ –Appendices
Organization...............................................................................................................................135
List of publications ...................................................................................................................140
List of accepted research proposals ......................................................................................145
Symposium.................................................................................................................................153
Plan of the building ..................................................................................................................154
Location ......................................................................................................................................155– ⅸ –Current Status of HiSOR

Status of the HiSOR storage ring
1. Introduction
The HiSOR is a synchrotron radiation (SR) source of Hiroshima Synchrotron Radiation
Center, Hiroshima University, established in 1996. It is a compact racetrack-type storage ring
having 21.95 m circumference, and its natural emittance of 400 nmrad is rather large
compared with those of the other medium to large storage rings. The most outstanding
advantage of the facility lies in good combination with state-of-the-art beamlines (BL’s) for
high-resolution photoelectron spectroscopy in the photon energy ranges between VUV andsoft X-ray. The principal parameters of HiSOR are shown in Table 1.
HiSOR has two 180-deg. Normal-conducting bending magnets which generate a strong
magnetic field of 2.7 T. This storage ring is equipped with two insertion devices, a linear
undulator and a quasi-periodic APPLE-II undulator which replaced to the previous helicalundulator in summer 2012. Major parameters of these undulators are listed in Table 2. The
photon energy spectra of the SR from HiSOR are shown in Figure .

Table 1: Main parameters of the HiSOR Storage ring.
CircumferenceType
Bending radius

21.95 mRacetrack
0.87 mBeam energy at Injection
at Storage
Magnetic field at Injection
at Storage
Injector

150 MeV
700 MeV
0.6 T
2.7 T
150 MeV Racetrack Microtron(1.72, 1.84)
191.244 MHz
14
200 kV
300 mA

Betatron tune (x, y)RF frequency
Harmonic number
RF voltage
Stored current (nominal)
Natural emittanceBeam life time
Critical wavelength
Photon intensity (5 keV)

400 nmrad~10 hours@200 mA
1.42 nm1.2×1011 /sec/mr2/0.1%b.w./300mA- 1 -Table 2: Main parameters of the undulators.
Linear undulator (BL-1)
Total length

2354.2 mm
57 mm
41
30-200 mm
0.41 T
Nd-Fe-B (NEOMAX-44H)

Periodic length u
Periodic number
Pole gap
Maximum magnetic field
Magnetic material

Quasi-Periodic APPLE-II
undulator (BL-9A,B)
Total length
1845 mm
78 mm
Periodic length u
Periodic number
Pole gap
Maximum magnetic field

23
23-200 mm
0.86 T (horizontal linear mode)
0.59 T (vertical linear mode)
0.50 T (helical mode)
Nd-Fe-B (NEOMAX-46H)

Magnetic material

Wave length [nm]
100

10

1

16

10

BL-9 QP-APPLE2(helical mode)

1st

BL-1 Linear undulator
3rdRing current = 300 mA

5th
7th peak

15

10

2

2

Brilliance [Photons/sec/mrad /mm /0.1 % b.w.]

1000

BL-9 QP-APPLE2(linear mode)

14

10

Bending magnet

13

10

12

10

BL1

BL5

11

10

BL7

BL9A
BL12
1

10

BL3
BL6
BL11

BL15

BL14
100

BL13

1000

Photon energy [eV]

Figure 1: Photon energy spectra of the SR from HiSOR.

- 2 -

10000

2. Operation status in FY 2018
The ring is operated for users from Tuesday to Friday. Figure 2 shows an example oftypical users operation for one day. Beam injection for HiSOR is executed twice a day, ataround 9:00 and 14:30. Machine is operated for machine conditionings and studies on
Monday.
Figure 3 shows monthly operation time of HiSOR storage ring in FY 2018. HiSOR has along term shutdown period for maintenance works in every summer. The total user time of
FY2018 achieved 1580 hours.
400

600
500
400

200

300
200

100
100
0
09:00

0
12:00

15:00

18:00

Time

Figure 2: Typical daily operation status.

Figure 3: Monthly operation time in FY 2018.

- 3 -Beam life time [min]Ring current [mA]300

Beamlines
A total of 13 beamlines has been constructed so far; three normal-incidence
monochromators, seven grazing-incidence monochromators, two double crystal
monochromators and apparatus for white beam irradiation (Fig. 1). Table 1 lists the beamlinesat present together with the main subject, energy range and monochromators.
Table 1: List of Beamlines

Subject

Energy range(eV)

Status22-300

In use1800-3200

In useBeamline

SourceMonochromator

BL-1

LU

GIM

BL-3

BM

DCM

BL-4

BM

BL-5

BM

GIM

ARPES and PEEM

40-220

In use

BL-6

BM

GIM

Gas-phase photochemistry200-1200

In use

BL-7

BM

GIM

ARPES

20-380

In use

BL-8

BM

BL-9A

HU/LU

NIM

BL-9B

HU/LU

GIM

BL-11

BM

BL-12

Polarization dependent
high-resolution ARPES
Surface XAFSWhite beam irradiation

ClosedBeam diagnosis

In use5-35

In useHigh-resolution
spin-resolved ARPES

16-300

In useDCM

XAFS

2000-5000

In useBM

NIM

VUV-CD of biomaterials

2-10

In use

BL-13

BM

GIM

Surface photochemistry60-1200

In use

BL-14

BM

GIM

Soft-XMCD of
nano-materials

400-1200

In use

BL-15

BM

NIM

VUV-CD of biomaterials

4-40

ClosedBL-16

BMBeam profile monitor

In useAt present, nine beamlines BL1, BL3, BL6, B7, BL9A, BL9B, BL11, BL12, BL13 andBL14 are opened for users. Furthermore, three offline systems, resonant inverse
photoemission spectrometer (RIPES), low-temperature scanning tunneling microscope(LT-STM) system, high-resolution angle-resolved photoemission spectrometer using
ultraviolet laser (Laser ARPES) are in operation (Fig. 2).

- 4 -Fig. 1: Schematic view of the experimental hall.

- 5 -Fig. 2： Experimental stations on the beamline and offline: (a) BL-1, (b) BL-3, (c) BL-6, (d)BL-7, (e) BL-9A, (f) BL-9B, (g) BL-11, (h) BL-12, (i) BL-13, (j) BL-14, (k) RIPES (offline),(l) LT-STM (offline), (m) Laser ARPES (offline), (n) Laser spin-ARPES (offline).

- 6 -Future Plan of HiSORDesign Study of an Electron Storage Ring for the Future
Plan of Hiroshima Synchrotron Radiation Center
S. Matsubaa , K. Shimadaa, M. Katoha, K. Kawaseb and K. Haradaca

Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima
739-0046, Japanb
National Institutes for Quantum and Radiological Science and Technology, 2-4 Shirane,Shirakata,Tokaimura,Ibaraki 319-1106,Japanc
High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba 305-0801, Japan

Keywords: Storage Ring, Lattice, Undulator, Brilliance.

We have designed a magnetic lattice of a storage ring for the future plan of Hiroshima synchrotron
radiation center [1]. We selected a basic cell structure similar to that of ASTRID2 [2]. Circumference of thisring is 49.5 m and natural emittance is 9.4 nm. The ring has three long and three short straight sections asshown in FIGURE 1. The 5m long straight sections are capable of installing long or tandem undulators foradvanced light source technologies [3]. The 2.2 m short straight sections are for installation of injection
system, RF cavity and an in-vacuum undulator. The optical functions are shown in FIGURE 2 and the main
parameters of storage ring are summarized in TABLE 1.
Figure 3 shows synchrotron radiation spectra calculated using a code SPECTRA [4] for a 4 m long
APPLE-II type with periodic length of 60 mm and the maximum K value of 3.4 in the horizontal polarization
condition and a 2 m long in-vacuum type with periodic length of 38 mm and K-value of 2.4-0.19. The
brilliance of the new ring is typically larger by 1 or 2 orders of magnitude than the present HiSOR at thebeam current of 300 mA, as shown in FIGURE 3.

FIGURE 1. Schematic layout of HiSOR-II storage ring [1].

- 7 -

FIGURE 2: Betatron functions and dispersion function for one third of HiSOR-II storage ring [1].

FIGURE 3: Comparison of brilliance of the synchrotron radiation from HiSOR and HiSOR-II.[1]TABLE 1: Main Parameters.
Beam energy
500 MeV
Circumference
49.5 mMagnetic field
1.027 T
Beam radius
1.623 mNatural emittance
9.4 nmBetatron tune
5.39, 2.09
Momentum compaction
0.01
RF frequency
102.96 MHz
Harmonic number
17
RF voltage
50 kV
Sored current
200 mA
Energy loss per turn3.4 keV
Energy spread
0.00037
Bunch length
17.8 mm

REFERENCES
1. S. Matsuba et al., J. Phys. Conf. Ser. (accepted)
2. Niels Hertel, Søren Pape Møller and Jørgen S. Nielsen, Preliminary Design Report for ASTRID2, August 2009
3. S. Matsuba K. Kawase, A. Miyamoto, S. Sasaki, M. Fujimo-to, T. Konomi, N. Yamamoto, M. Hosaka, M. Katoh, Appl.
Phys. Lett. 113, 021106 (2018).
4. T. Tanaka and H. Kitamura, J. Synchrotron Rad. (2001). 8, 1221-1228.

- 8 -Research Activities– Accelerator Studies –Vector beam generation with tandem helical undulators in
UVSOR
Shunya Matsubaa ,Keigo Kawaseb , Atsushi Miyamotoc ,Shigemi Sasakia d ,Masaki Fujimotoe , Taro Konomif , Naoto Yamamotof , Masahito Hosakag and
Masahiro Katohe,gaHiroshima Synchrotron Radiation Center, Hiroshima University, bQST, cToshiba, dAPS,
Institute for Molecular Science, National Institutes of Natural Sciences/Sokendai, fKEK,g
Synchrotron Radiation Research Center, Nagoya University, Nagoya 464-8603, Japane

Vector beams is a sort of structured light which have a donuts-shaped intensity with spatiallydependent polarization that direction rotates around its beam axis [1,2]. Some examples of vector
beams are shown in the Figure.1. Vector beams of radial polarization, shown in the left figure of Fig.1,
can be focused beyond the diffraction limit and longitudinal electric fields appear when focused.
Therefore, they have been investigated for many applications including imaging and opticalcommunication, plasmon excitation and acceleration of electrons [2]. Vector beams has long beeninterest in laser community. Edge radiation and transition radiation are known as radial polarized
beam in accelerator light source. Therefore, we propose a scheme to generate vector beams bysynchrotron radiation [3]. The scheme is akin to cross undulator which produces circularly polarized
light from tandem horizontally and vertically polarized undulators [4]. We expand to the scheme into
two-dimensional superposition of second harmonics from two oppositely circular polarized undulators.
Second harmonics of helical undulators is known as optical vortices which have a donut-shaped
intensity, uniform circular polarization state with forming spiral phase front. It is well known that
vector beams can be created by superposing two optical vortex beams. The example of experimental
results are shown in the right figures of Fig.1. We present principle and experimental details of thisscheme in this presentation.

Fig. 1. A schematic illustration of vector beams (left and middle) and distributions of directions of polarization obtained byexperiment (right). The arrows and back ground indicated polarization direction and intensity of each positions.

REFERENCES[1] H. Rubinsztein-Dunlop, et. al., J. Opt. 19, 013001 (2017).
[2] Q. Zhan, Adv. Opt. Photonics 1, 1 (2009).
[3] S. Matsuba, et al., Appl. Phys. Lett. 113, 021106 (2018).
[4] K. J. Kim, Nucl. Instrum. Meth. Phys. Res. 219, 425 (1984).

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