Observation of circularly polarized radiation from multimode undulator at HiSOR
The linear / helical multimode undulator that is able to produce polarized radiation of any ellipticity operates successfully in Hiroshima Synchrotron Radiation Center. Polarization measurements have been performed for helical mode of undulator using IR-UV polarimeter at the beamline BL9 of the 700...
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| Published in: | Вопросы атомной науки и техники |
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| Date: | 2001 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Cite this: | Observation of circularly polarized radiation from multimode undulator at HiSOR / G.V. Rybalchenko, M. Morita, K. Shirasawa, N.V. Smolyakov, K. Goto, A. Hiraya // Вопросы атомной науки и техники. — 2001. — № 1. — С. 102-106. — Бібліогр.: 13 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860227953218027520 |
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| author | Rybalchenko, G.V. Morita, M. Shirasawa, K. Smolyakov, N.V. Goto, K. Hiraya, A. |
| author_facet | Rybalchenko, G.V. Morita, M. Shirasawa, K. Smolyakov, N.V. Goto, K. Hiraya, A. |
| citation_txt | Observation of circularly polarized radiation from multimode undulator at HiSOR / G.V. Rybalchenko, M. Morita, K. Shirasawa, N.V. Smolyakov, K. Goto, A. Hiraya // Вопросы атомной науки и техники. — 2001. — № 1. — С. 102-106. — Бібліогр.: 13 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The linear / helical multimode undulator that is able to produce polarized radiation of any ellipticity operates successfully in Hiroshima Synchrotron Radiation Center. Polarization measurements have been performed for helical mode of undulator using IR-UV polarimeter at the beamline BL9 of the 700 MeV storage ring (HiSOR). High degree of circular polarization has been obtained. The comparison between achieved performance and numerical simulation was made. The main reason of slight distinction between them was found to be in the influence of non-undulator radiation.
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OBSERVATION OF CIRCULARLY POLARIZED RADIATION
FROM MULTIMODE UNDULATOR AT HiSOR
G.V. Rybalchenkoa, M. Moritaa, K. Shirasawaa, N.V. Smolyakova,b, K. Gotob, A. Hirayaa,b
a - Department of Physical Science and b - Hiroshima Synchrotron Radiation Center (HSRC)
Hiroshima University, Higashi-Hiroshima 739-8526, Japan
The linear / helical multimode undulator that is able to produce polarized radiation of any ellipticity operates
successfully in Hiroshima Synchrotron Radiation Center. Polarization measurements have been performed for
helical mode of undulator using IR-UV polarimeter at the beamline BL9 of the 700 MeV storage ring (HiSOR).
High degree of circular polarization has been obtained. The comparison between achieved performance and
numerical simulation was made. The main reason of slight distinction between them was found to be in the
influence of non-undulator radiation.
PACS Codes: 41.60.-m, 41.60.Ap, 42.25.Ja, 07.85.Qe.
INTRODUCTION
Recently considerable progress was attained in
generation of synchrotron radiation in a wide energy
range. By now a number of new insertion devices
designed for production of high brilliant circular
polarized light are suggested and successfully operated
worldwide. Among them, circularly polarized photon
sources with the capability of switching the polarization
are the subjects of interests for many applications, since
an essential component for various experiments in
biology and materials science is a radiation with
variable polarization characteristics. One of such
devices, a linear / helical multimode undulator [1] was
installed at one of two straight sections of a compact
racetrack-type 700 MeV storage ring (HiSOR) of
Hiroshima Synchrotron Radiation Center (HSRC) [2].
HiSOR storage ring consists of two 180° normal-
conducting bending magnets with maximum magnetic
field 2.7 T and four quadrupole magnets. The radius of
the electron orbit in bending magnet is R=0.86 m and
synchrotron radiation critical energy is 873 eV. The
linear / helical multimode undulator was designed to
enhance the intensity and degree of circular polarization
of photon beam in comparison with those radiating from
bending magnet. The first observation of the undulator’s
radiation shows almost the same performance to the
designed values [3]. The HiSOR helical/linear
multimode undulator has a similar design to those of the
elliptical wiggler for Spring-8 [4,5] and the helical
undulator for UVSOR [6]. The undulator consists of
upper and lower jaws same as a conventional linear
undulator while each jaw is separated into three
standard Halbach-type permanent magnet arrays, one
fixed magnet array at the center and two outer sliding
magnet arrays. Configuration of the multimode
undulator allows the continuous transformation from
linear mode through elliptical to helical mode by
varying of the relative displacement of the outer magnet
arrays. Therefore, the linear, elliptical and right or left
circular type of polarization can be generated.
Helical mode of HiSOR’s multimode undulator
(Fig. 1) can be the source of high circularly polarized
radiation in UV – VUV energy regions. According to
resent experimental requirements, the beamline (BL9)
of this undulator was equipped with a 3 m off-plane
Eagle monochromator [7]. As a result, the unique
combination of the multimode undulator and high
resolution Eagle monochromator was obtained. In this
article the description of undulator, operated in the
helical mode, and analysis of the measurements of
radiation polarization properties were carried out.
Fig. 1. Helical mode of the HiSOR’s multimode
undulator. d is the displacement of the side arrays in
reference to their non-shifted position, λ u is the length
of undulator period
HELICAL MODE OF MULTIMODE
UNDULATOR
The general parameters of the linear / helical
undulator are summarized in Table 1. One can see, that
measured magnetic field amplitudes are 1-2% lower
than designed values. Therefore, the minimum energy
range of the undulator is slightly shifted to the higher
energy side.
The analysis of the undulator operating in different
modes is given elsewhere [8], so here only the detailed
description of the helical mode, that generates circularly
polarized light, will be consider (Fig. 1). The multimode
undulator was designed to operate in the helical mode
with the energy range of 4 - 40 eV and higher degree of
circular polarization than 99%. To obtain such a high
degree of polarization the vertical to horizontal
magnetic field ratio y xB B should be as close to unity
as possible for any gap. Moreover, the specific feature
of HiSOR is the large horizontal beam emittance.
Therefore, the profile width of the vertical magnetic
field transverse distribution should be wide enough for
the stable operation of the ring. Different shapes of the
central magnet were examined according to these two
criteria: unity y xB B ratio and flat vertical field profile.
102 PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2001, № 1.
Series: Nuclear Physics Investigations (37), p. 102-106.
Finally the “grooved” shape, which is most optimal
from the both viewpoints of vertical to horizontal field
ratio ( )≈y xB B for any gap and flat distribution of By
along x-axis, was chosen for the center magnet of
undulator see Fig. 2. It is important to note that with the
increasing of the gap the behavior of the horizontal and
vertical fields amplitudes is slightly different from each
other, and, consequently, vertical to horizontal magnetic
field ratio is not constant, comprising 1 0.06± for all
gap interval. Although in this case the degree of circular
polarization is expected to be higher than 99%, further
adjustment is possible to obtain unity value of the
vertical to horizontal magnetic field ratio for any gap
with introducing of slight side arrays shift from helical
mode, see Fig. 3. To obtain this figure, value of the side
arrays shift d, at which 1=y xB B , was calculated for
gap interval 30-120 mm. After that for each pair of gap
and d the value of deflection parameter K was found and
plotted as a 3D scatter. Deflection parameters are
defined here by the following standard way
2 2 2= +x yK K K and [ ] [ ], ,93.4 m Tλ=x y u x yK B .
Table 1. Parameters of the multimode undulator
Period length, λu 100 mm
Number of periods 18
Total length 1828.6 mm
Gap distance 30-200 mm
Permanent magnet NdFeB (Neomax 44H)
Helical mode: Designed Measured
Max. magnetic field, T 0.347 0.340
Deflection parameter 4.6 4.37
Energy range, eV 4.2~40 4.4~46
Linear mode: Designed Measured
Max. magnetic field, T 0.597 0.593
Deflection parameter 5.6 5.54
Energy range, eV 2.8~350 2.85~355
Fig. 2. Vertical cut of the lower jaw of the
linear/helical undulator
BEAMLINE OPTICS
The undulator is now operating routinely in the helical
mode, though changing of the gap is restricted to few
times a day. The polarization properties of the
fundamental radiation at 30 mm gap were measured at
BL9 beamline (Fig. 4a) equipped with a 3-m off-plane
Eagle monochromator. The monochromator was
designed to perform the measurements with the circular
/ linear polarized light source in the photon energy
region from 4 to 40 eV. Resolving power of this
monochromator is very high since the sum of incidence
and diffraction angles for grating is equal zero, entrance
end exit slits S1 and S2 are displaced sidewise
symmetrically on the Rowland cylinder and the angle
1 2− −Р S G S is always equal to 4.5° . Obviously, when
undulator radiation and a monochromator are combined,
the polarization characteristics of both should be known
in order to predict the resulting degree of polarization.
The beamline was specially designed to preserve the
degree of circular and linear polarization in all working
region. For example, Fig. 4b shows the changes of
circular polarization at each optical elements of the
beamline, which were calculated using the optical
constant of materials. It was assumed that the effect on
polarization by diffraction at a grating is the same with a
mirror (Samson’s model) [9].
30
60
90
120
1
2
3
4
5
24
25
26
K
ar
ra
ys
s
h i
ft
d ,
m
m
gap , m m
Fig. 3. Adjustment of helical/linear undulator
parameters for obtaining the unity y xB B ratio. K is a
deflection parameter of the multimode undulator,
obtained for each pair of gap and arrays shift values
174 174
168
4. 54DS
M0
M1
S1
S2
MF
GR
End Station
UR
Top View
Side View
o
o
o
o
undulator
100% CP
C hange of po la riza tion property a t m irros and g ra ting o f the beam line
after M0
after M1
< − − − − − − − − − Elliptically polarized − − − − − − − − − >
after GR
after Mf
100% CP again
Fig. 4. Layout of BL9 and changes of polarization
property at optical elements of the beamline. 4DS is a
rectangular slit; GR is grating with the order of
diffraction equal to -1; S1 and S2 are entrance and exit
slits; M0, M1 and MF are mirrors
Calculation shows that absolute degree of circular
polarization of incident light from undulator compared
to that of the light after the postfocusing mirror (MF) is
identical with that of incident undulator radiation within
about ~10-5 difference. However, the sign of the circular
polarization degree is changed by the optical elements
of the beam-line to the opposite one, i.e. the incident
light with “right” circular polarization after Mf is
converted to the light with “left” circular polarization.
This phenomenon was confirmed by experiments. The
103
results of the preliminary measurements of polarization
type before and after monochromator shows that at side
arrays shift 4λ= ud polarization is right circular after
undulator and is left circular after monochromator. At
side arrays shift 4λ= − ud polarization type reverses.
MEASUREMENT OF POLARIZATION
PROPERTIES
In order to measure Stokes parameters (S0, S1, S2, S3),
which completely characterize the polarization state of
the light beam [10], polarimeter consisted of phase
shifter and linear polarizer is needed. The photon energy
for the helical mode of multimode undulator at small
gaps is in UV-region. Therefore, it is possible to use
transmission type optical elements. The measurements
of polarization properties were carried out using the IR-
UV four-Stokes polarimeter equipped with a double
Fresnel rhomb with retardation angle ∆=π/2 at photon
energy 4.29 eV as the phase shifter and a linear polarizer
with the extinction coefficient about 10-6. The final light
intensity was measured by using of the photodiode
detector.
According to [11], intensity of light transmitted by
this polarimeter can be expressed by the following
equation:
3210~),( SSSSI υτςβα +++
where
( ) ( )2 2 cos cos 2 1 cos sin 2 ,ς β β= + ∆ − − ∆C S CS
( ) ( )2 21 cos cos 2 cos sin 2 ,τ β β= − − ∆ + + ∆CS S C
sin cos 2 sin sin 2 .υ β β= − ∆ − ∆S C
Here cos 2α=C , sin 2α=S , α is a rotating angle of
the phase shifter around optical axis, β is that of the
linear polarizer and ∆ is retardation of the phase shifter.
From this equation one can see that in order to obtain
Stokes parameters it is enough to measure radiation
intensity I(α,β) for example at the following six pairs of
angles α and β: (0,0), (0,π/2), (π/4,0), (π/4,π/4), (π/4,−π
/4) and (−π/4,0). After that Stokes parameters can be
obtained by substituting the experimental results in the
following equation:
( ) ( )
( ) ( )
( ) ( )
( ) ( )
0
1
2
3
0,0 0, 2
0,0 0, 2
.
4 , 4 4, 4
4,0 4,0 sin
π
π
π π π π
π π
+ж цж ц
з чз ч −з чз ч = з чз ч − −
з чз чз ч з ч− − ∆й щи ш л ыи ш
I IS
I IS
I IS
I IS
The polarization properties of the light are defined using
Stokes parameters as follows:
( )
3 0
2 2 2
1 2 0
2 2
,
,
1 .
=
= +
= − +
c
L
U c L
P S S
P S S S
P P P
Here cP and LP are degree of circularly and linearly
polarization, UP is the degree of unpolarized light.
Measurements of the radiation properties were
carried out for helical mode of multimode undulator at
minimum gap for 4-5 eV energy region. At these
measurements the size of 4DS was 8x4 mm, width of S1
and S2 was 100 µm and E/∆E was about 28,000.
Example of the experimental results for fundamental
peak energy 4.41 eV is shown at Fig. 5. There the
current of the photodiode, which is proportional to the
intensity of radiation, is plotted for different angles α vs
rotating angle β of the linear polarizer. In order to
decrease the measurement error the photodiode current
was measured at many angles β, whereupon it was fitted
by sine function and substituted into Eq. 1. The
radiation properties derived from the results, presented
at Fig. 6, are shown at the first column of the Table 2.
Here S1/S0, S2/S0 and S3/S0 are normalized Stokes
parameters.
0 20 40 60 80 100 120 140 160 180
0
1
2
3
4
5
6
C
ur
re
nt
o
f p
ho
to
di
od
e,
n
A
Rotaing angle of Linear Polarizer β , deg
angle α
0
π /4
π /2
3π /4
Fig. 5. Intensity of light transmitted to polarimeter.
Current of photodiode at fixed rotating angle α of the
phase shifter is plotted as function of rotating angle β of
the linear polarizer. Each point corresponds to
measured value; each line is curve fitting of the
measurement data by using sine wave function
Table 2. Stokes parameters of the radiation for 30
mm gap at helical mode of the undulator measured at
fundamental peak energy 4.41 eV. 1st column:
measurements after monochromator; 2d column:
numerical calculation of undulator radiation; 3d
column: estimation with taking into account non-
undulator radiation. Pc, PL, and PU are degree of
circular, linear and unpolarized light
Value Measured Calculated “Pure”
S1/S0 -0.045 -0.0465 -0.05
S2/S0 -0.0483 -0.00471 -0.051
PC =S3/S0 -0.977 -0.998 -0.983
PL 0.066 0.0474 0.0712
PU 0.021 0.00071 0.0143
RESULTS AND DISCUSSION
Stokes parameters of undulator radiation were obtained
for 30mm gap at helical mode with side arrays shift
4ud λ= at several photon energies around the
fundamental peak. The radiation characteristics have
been estimated using computer code “Smartwig” [12].
Fig. 6 shows measured (a) and calculated (b) intensities
of radiation and the degrees of circular polarization (c).
Numerical results of estimation for fundamental peak
are shown at the 2d column of the Table 2, in
comparison with the measured results, shown at 1st
column. One can see, that the high cP ratio (97.7%) was
experimentally obtained at the fundamental peak
energy. However, measured polarization value at the
peak is slightly, about 2%, lower than the calculated
104
value (99.8%). The main reason of the low cP could be
the effect of the radiation from other source, for
example edge radiation. Additional experiments were
carried out in order to investigate the properties of this
radiation. At maximum gap undulator magnetic field is
small enough and doesn’t affect the beam trajectory.
Therefore, the measurements of polarization properties
and intensity of non-undulator radiation were performed
at gap value 200 mm. They show that average value of
non-undulator radiation (NUR) is two orders lower than
the fundamental peak intensity, see Fig. 6a. Non-
undulator radiation is nearly linearly polarized with
almost constant normalized Stokes parameters (0.67,
0.40, 0.01) at each measured points.
The degree of “pure” undulator radiation (UR) was
estimated for all energy region with taking into account
measured polarization properties and
( )= +NUR NUR URQ I I I ratio, where ( )+NUR URI I is the overall
intensity for minimum gap (30mm) and NURI is that for
maximum gap (200mm). It is important to note that in
the analysis of “pure” UR polarization properties the
undulator and non-undulator were considered as
incoherent radiation sources. At first, Stokes parameters
of the UR were calculated according to the following
formulae:
( )
1 0 1 0 1 0
2 0 2 0 2 0
3 0 3 0 3 0
1 .
+
ж ц ж ц ж ц
з ч з ч з ч− = −з ч з ч з ч
з ч з ч з ч
и ш и ш и шUR UR NUR NUR
S S S S S S
Q S S S S Q S S
S S S S S S
After that polarization properties of “pure” UR were
found according to Eq. .
As an example, the radiation parameters of the “pure”
UR at the fundamental peak are shown at the third
column of the Table 2. Using experimentally measured
Q value degree of circularly polarization of the UR was
found to be higher than measured Pc value in all photon
energy region, as shown in Fig. 6b. Obviously,
influence of the NUR is much stronger for energy
region above and below the peak. The degree of
polarization for “pure” undulator radiation it still
slightly reduced comparing with the calculation. This
difference could be caused by the imperfection of
Samson’s model, which is usually applied in VUV and
soft X-ray regions. Since the grating is treated simply as
a mirror in the calculation, these effects may be caused
by the diffraction at a grating. Another reasons of
difference in measured and simulated results could be
the misalignment of the beamline, small deviation of the
beam orbit from the designed one or inaccuracy of
measurement system. However, one can see from the
Table 2, that the influence of these errors to the degree
of circular polarization is very small.
1x1010
1x1011
1x1012
4.0 4.2 4.4 4.6 4.8 5.0
N
or
m
al
iz
ed
in
te
ns
ity
of
r
ad
ia
tio
n
(a)
Photon energy, eV
P
ho
to
n
F
lu
x
(P
ho
to
ns
/s
/1
00
m
A
)
4.0 4.2 4.4 4.6 4.8 5.0
0.6
0.7
0.8
0.9
1.0 (c)
(b)
A
bs
ol
ut
e
de
gr
ee
of
C
irc
ul
ar
P
ol
ar
iz
at
io
n 0.0
0.2
0.4
0.6
0.8
1.0
Fig. 6. Intensity of radiation and the degree of
circular polarization. (a) measured photon flux. Solid
line - gap 30 mm and phase 25 mm, dash line - gap 30
mm and phase −25 mm, dot line - gap 200 mm; (b)
normalized intensity of undulator radiation at gap 30
mm and phase 25 mm (solid line), in comparison with
the calculation (dot line); (c) degree of circular
polarization. Solid line corresponds to the calculated
Pc, black squares (■) show measured Pc, and open
triangles (∇) show Pc of “pure” undulator radiation
4.0 4.2 4.4 4.6 4.8 5.0
0.00
0.10
0.20
P
C
P
L
Photon Energy (eV)
-1.00
-0.90
0.00
0.05
0.10
P
U
Fig. 7. Calculated and estimated degrees of
polarizations. black squares (■) are measured values of
the radiation polarization properties and open triangles
(∇) are estimated values of “pure” undulator radiation
characteristics. cP and LP are degree of circularly and
linearly polarization. UP is the degree of unpolarized
light. Dash line indicates the position of fundamental
peak
The results of comparison of all polarization
properties of “pure” undulator radiation estimation and
calculation are shown at Fig. 7. One can see, that the
degrees of circularly polarization and unpolarized light
are in good agreement, the only noticeable difference is
in degree of linear polarization. In the described above
estimation of “pure” UR polarization properties the
interference effect of undulator and non-undulator
radiation was not taken into account. The difference
between “pure” radiation properties and calculations
105
may be caused by such interference. To investigate this
problem, additional calculations were performed with
the including of the effect of radiation from bending
source by the new complex of computer codes
SMELRAD (SiMulation of ELectromagnetic
RADiation) [13]. These codes employ the same to the
codes for wiggler radiation [12] approach. However, the
electron tracking can be performed in the total field
from many sources with arbitrary magnetic field, for
example in the fields of two bending magnets and
undulator. In this case calculations include interference
effects from different radiation sources, for example
undulator field and fringe field at bending magnets.
Simulation of edge and wiggler radiation characteristics
was performed in experimentally measured magnetic
fields with taking into account electron beam emittance.
Results of such computation are shown at Fig. 8
together with the results of measurements. The better
agreement between both results is obtained compared
with the calculations of just undulator radiation
properties. However, the agreement is not so good,
which means that some other sources of radiation, like
quadrupole radiation, should be taken into account.
Intensity of radiation and its polarization properties
were also measured at opposite helicity of helical mode,
i.e. side arrays shift d is equal to 4λ− u . The results
were in good agreement with the measurements at
4λ= ud . The small difference in radiation intensity,
see Fig. 7a, was probably caused by deviations in
electrons orbit. Absolute value of the degree of
polarization at fundamental peak of the radiation
intensity was the same for both measurements.
4.0 4.2 4.4 4.6 4.8 5.0
0.6
0.7
0.8
0.9
1.0
Photon Energy (eV)
A
b
so
lu
te
d
e
g
re
e
o
f
C
ir
cu
la
r
P
o
la
ri
za
tio
n
Fig. 8. Measured (black square ■) and calculated
with the including of interference effects of undulator
and edge radiation (open circle ○) degree of circular
polarization
CONCLUSION
Linear / helical multimode undulator at HiSOR
successfully generates radiation with almost the same
performance to the designed values. Stokes parameters
were experimentally determined for helical mode of
multimode undulator at minimum gap for 4-5 eV energy
region by performing of polarization measurements
using IR-UV polarimeter. Measurements show the high
degree of circular polarization. The experimental results
were compared with the numerical calculations. The
main reason of difference between them is in the
influence of non-undulator radiation, such as bending or
edge. Regardless of the fact that the intensity of such
radiation is small compared to the intensity of undulator
radiation, it can changes the polarization state of the
light, especially in the regions above and below of the
fundamental peak.
ACKNOWLEDGMENTS
We would like to thanks M. Arita (Technical
official, HSRC), M. Aratake, T. Goya (Department of
Physical science, Hiroshima University), and HiSOR
operating staffs for their help in the experiments.
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mator at the helical undulator beamline of HiSOR //
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106
OBSERVATION OF CIRCULARLY POLARIZED RADIATION
FROM MULTIMODE UNDULATOR AT HiSOR
G.V. Rybalchenkoa, M. Moritaa, K. Shirasawaa, N.V. Smolyakova,b, K. Gotob, A. Hirayaa,b
a - Department of Physical Science and b - Hiroshima Synchrotron Radiation Center (HSRC)
Hiroshima University, Higashi-Hiroshima 739-8526, Japan
INTRODUCTION
HELICAL MODE OF MULTIMODE UNDULATOR
BEAMLINE OPTICS
MEASUREMENT OF POLARIZATION PROPERTIES
RESULTS AND DISCUSSION
CONCLUSION
ACKNOWLEDGMENTS
REFERENCES
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| id | nasplib_isofts_kiev_ua-123456789-78523 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T18:20:24Z |
| publishDate | 2001 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Rybalchenko, G.V. Morita, M. Shirasawa, K. Smolyakov, N.V. Goto, K. Hiraya, A. 2015-03-18T17:50:00Z 2015-03-18T17:50:00Z 2001 Observation of circularly polarized radiation from multimode undulator at HiSOR / G.V. Rybalchenko, M. Morita, K. Shirasawa, N.V. Smolyakov, K. Goto, A. Hiraya // Вопросы атомной науки и техники. — 2001. — № 1. — С. 102-106. — Бібліогр.: 13 назв. — англ. 1562-6016 PACS Codes: 41.60.-m, 41.60.Ap, 42.25.Ja, 07.85.Qe. https://nasplib.isofts.kiev.ua/handle/123456789/78523 The linear / helical multimode undulator that is able to produce polarized radiation of any ellipticity operates successfully in Hiroshima Synchrotron Radiation Center. Polarization measurements have been performed for helical mode of undulator using IR-UV polarimeter at the beamline BL9 of the 700 MeV storage ring (HiSOR). High degree of circular polarization has been obtained. The comparison between achieved performance and numerical simulation was made. The main reason of slight distinction between them was found to be in the influence of non-undulator radiation. We would like to thanks M. Arita (Technical official, HSRC), M. Aratake, T. Goya (Department of Physical science, Hiroshima University), and HiSOR operating staffs for their help in the experiments. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Theory and technics of particle acceleration Observation of circularly polarized radiation from multimode undulator at HiSOR Наблюдение циркулярно поляризованного излучения из мультирежимного ондулятора на накопительном кольце HiSOR Article published earlier |
| spellingShingle | Observation of circularly polarized radiation from multimode undulator at HiSOR Rybalchenko, G.V. Morita, M. Shirasawa, K. Smolyakov, N.V. Goto, K. Hiraya, A. Theory and technics of particle acceleration |
| title | Observation of circularly polarized radiation from multimode undulator at HiSOR |
| title_alt | Наблюдение циркулярно поляризованного излучения из мультирежимного ондулятора на накопительном кольце HiSOR |
| title_full | Observation of circularly polarized radiation from multimode undulator at HiSOR |
| title_fullStr | Observation of circularly polarized radiation from multimode undulator at HiSOR |
| title_full_unstemmed | Observation of circularly polarized radiation from multimode undulator at HiSOR |
| title_short | Observation of circularly polarized radiation from multimode undulator at HiSOR |
| title_sort | observation of circularly polarized radiation from multimode undulator at hisor |
| topic | Theory and technics of particle acceleration |
| topic_facet | Theory and technics of particle acceleration |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/78523 |
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