Effect of solenoidal magnetic field on the multipacting effect in sub-harmonic buncher of Shanghai synchrotron radiation facility (SSRF) linac

The magnetic field configuration of the previously proposed knot undulator [Qiaoet al.(2009).Rev. Sci. Instrum.80, 085108] is realised in the design of a hybridized elliptically polarized undulator, which is presented. Although the details of the field distribution are not the same as those in the theoretical proposal, it is demonstrated that the practical knot undulator could work perfectly. In order to understand the minor discrepancies of the two, mathematical formulae of the synchrotron radiation are derived based on the Fourier transform of the magnetic field. From the results of calculations by simulation program, the discrepancies could be well interpreted by the corresponding formulae. The results show the importance of optimization of the end sections of the knot undulator to suppress the on-axis heat load. Furthermore, a study of the impact of the undulator on beam dynamics of the storage ring was conducted using the Shanghai Synchrotron Radiation Facility as an example and the results show that the knot undulator has little effect on the beam.

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Polarization and spin effects in processes of synchrotron radiation and pair creation in strong magnetic field

2008 9th International Conference on Laser and Fiber-Optical Networks Modeling ◽

10.1109/lfnm.2008.4670375 ◽

2008 ◽

Author(s):

O. P. Novak ◽

R. I. Kholodov

Keyword(s):

Magnetic Field ◽

Synchrotron Radiation ◽

Strong Magnetic Field ◽

Pair Creation ◽

Spin Effects

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Thermalization of synchrotron radiation from field-aligned currents

Laser and Particle Beams ◽

10.1017/s0263034600005413 ◽

1988 ◽

Vol 6 (3) ◽

pp. 493-501 ◽

Cited By ~ 8

Author(s):

William Peter ◽

Anthony L. Peratt

Keyword(s):

Magnetic Field ◽

Synchrotron Radiation ◽

Energy Density ◽

Radiation Spectrum ◽

Axial Magnetic Field ◽

Three Dimensional ◽

Synchrotron Emission ◽

Microwave Background ◽

Strong Function ◽

Current Filaments

Three-dimensional plasma simulations of interacting galactic-dimensioned current filaments show bursts of synchroton radiation of energy density 1·2 ×10−13 erg/cm3 which can be compared with the measured cosmic microwave background energy density of 1·5 × 10−13 erg/cm3. However, the synchrotron emission observed in the simulations is not blackbody. In this paper, we analyze the absorption of the synchrotron emission by the current filaments themselves (i.e., self-absorption) in order to investigate the thermalization of the emitted radiation. It is found that a large number of current filaments (>1031) are needed to make the radiation spectrum blackbody up to the observed measured frequency of 100 GHz. The radiation spectrum and the required number of current filaments is a strong function of the axial magnetic field in the filaments.

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Atomic pair distribution function method development at the Shanghai Synchrotron Radiation Facility

Chinese Physics B ◽

10.1088/1674-1056/26/7/076101 ◽

2017 ◽

Vol 26 (7) ◽

pp. 076101 ◽

Cited By ~ 1

Author(s):

Xiao-Juan Zhou ◽

Ju-Zhou Tao ◽

Han Guo ◽

He Lin

Keyword(s):

Distribution Function ◽

Synchrotron Radiation ◽

Pair Distribution Function ◽

Function Method ◽

Method Development ◽

Shanghai Synchrotron Radiation Facility ◽

Atomic Pair Distribution Function ◽

Atomic Pair

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Synchrotron Radiation Spectra

Publications of the Astronomical Society of Australia ◽

10.1017/s1323358000013291 ◽

1972 ◽

Vol 2 (3) ◽

pp. 142-144 ◽

Cited By ~ 1

Author(s):

L. J. Gleeson ◽

K. C. Westfold

Keyword(s):

Magnetic Field ◽

Synchrotron Radiation ◽

Energy Distribution ◽

Power Law ◽

Uniform Magnetic Field ◽

Charged Particles ◽

Radiation Spectra ◽

Field Lines

In this paper we give an account of the corrections that must be made to the formula for the emissivity ηf due to a power-law energy distribution of ultrarelativistic charged particles in a uniform magnetic field B0 in directions well away from the field lines when the effects of upper and lower cut-off values E2 and E1 in the energy distribution are not negligible.

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Evaluation of an elliptically polarized undulator for the future Taiwan Photon Source

Journal of Instrumentation ◽

10.1088/1748-0221/16/12/p12017 ◽

2021 ◽

Vol 16 (12) ◽

pp. P12017

Author(s):

H.-W. Luo ◽

T.-Y. Chung ◽

C.-H. Lee ◽

C.-S. Hwang

Keyword(s):

Magnetic Field ◽

Electron Beam ◽

Synchrotron Radiation ◽

Transverse Field ◽

Longitudinal Direction ◽

X Ray ◽

Elliptically Polarized ◽

Transverse Position ◽

Photon Source ◽

Field Integral

Abstract The resonant photon energy of an adjustable-phase undulator (APU) is varied with the relative motion of the magnet arrays along the longitudinal direction. There exists, however, a transverse field gradient (TFG) of order 100 T/m in an APU of small gap (∼10 mm). Whereas the TFG might affect the electron beam as it contributes to the dynamic field integral and the radiation integrals, the TFG might also degrade the performance of the synchrotron radiation due to the transverse position-dependent magnetic field. The effects of the TFG on the present Taiwan Photon Source (TPS) and future TPS-upgraded are analyzed to investigate the feasibility of an APU that operates in the soft x-ray region.

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