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

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.

scholarly journals Hot Accretion Disks with Magnetic Field and Thermal Cyclo-Synchrotron Radiation

1994 ◽  
Vol 159 ◽  
pp. 485-485
Author(s):  
Masaaki Kusunose ◽  
Andrzej A. Zdziarski
Keyword(s):  
Magnetic Field ◽  
Synchrotron Radiation ◽  
Spectral Index ◽  
Accretion Disks ◽  
Qualitative Properties ◽  
Bremsstrahlung Radiation ◽  
X Ray ◽  
Accretion Rates ◽  
Galactic Black Hole ◽  
Two Temperature

We study the structure of hot, two-temperature accretion disks around black holes, including the effects of thermal cyclo-synchrotron radiation and magnetic viscosity. This work is an extension of previous work by Björnsson & Svensson (1991a, b, 1992) and Kusunose & Mineshige (1992), which did not include those effects. Magnetic field, B, is assumed to be randomly oriented and determined by prescribing the ratio α = Pmag/Pgas or α = Pmag/(Pgas + Prad), where Pmag, Pgas, and Prad are the pressures of magnetic field, gas, and radiation, respectively. We find those effects do not change the qualitative properties of the disks, i.e., there are two critical accretion rates related to production of e± pairs, ṀcrU and ṀcrL that affect the number of local and global disk solutions, as recently found for the case with B = 0 (Björnsson & Svensson 1991a, b, 1992). However, a critical value of the α-viscosity parameter above which those critical accretion rates disappear becomes smaller than αcr = 1 found in the case of B = 0, for Pmag = α(Pgas + Prad). If Pmag = αPgas, on the other hand, αcr is still about unity. Moreover, when Comptonized cyclo-synchrotron radiation dominates Comptonized bremsstrahlung, radiation from the disk obeys a power law with the energy spectral index of ∼ 0.5, in a qualitative agreement with X-ray observations of AGNs and Galactic black hole candidates. The spectral index is weakly dependent on the mass accretion rate.

Simulation of bunched electron-beam acceleration by the cylindrical TE113 microwave field

2019 ◽  
Vol 34 (36) ◽  
pp. 1942030
Author(s):  
E. A. Orozco ◽  
J. D. González ◽  
J. R. Beltrán ◽  
V. E. Vergara
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Microwave Field ◽  
Inhomogeneous Magnetic Field ◽  
X Ray ◽  
Particle In Cell ◽  
Magnetic Field Profile ◽  
Detailed Simulation ◽  
The Magnetic Field ◽  
Particle Approximation

We report a detailed simulation of a bunched electron-beam accelerated in a TE[Formula: see text] cylindrical cavity immersed in a static inhomogeneous magnetic field using a relativistic full electromagnetic particle-in-cell (PIC). This type of acceleration concept is known as Spatial AutoResonance Acceleration (SARA) in which the magnetic field profile is such that it keeps the electron-beam in the acceleration regime along their trajectories. In this work, the numerical experiments are carried out including a bunched electron-beam with the concentrations in the range [Formula: see text]–[Formula: see text][Formula: see text]cm[Formula: see text] in a TE[Formula: see text] cylindrical microwave field, at a frequency of 2.45 GHz and an amplitude of 15 kV/cm. The electron energy reaches values up to 250 keV without significant unfocusing effect that can be used as a basis to produce hard X-ray. Additionally, a comparison between the data obtained from the full electromagnetic PIC simulations and the results derived from the relativistic Newton–Lorentz equation in a single particle approximation is carried out.

Picosecond Electron-Beam And Synchrotron Radiation Pulse Radiolysis For Studies On Electron-Beam And X-Ray Resists

1989 ◽  
Author(s):  
Yoichi Yoshida ◽  
Hiromi Shibata ◽  
Seiichi Tagawa ◽  
Masakazu Washio ◽  
Yoneho Tabata ◽  
...  
Keyword(s):  
Electron Beam ◽  
Synchrotron Radiation ◽  
Pulse Radiolysis ◽  
Radiation Pulse ◽  
X Ray

Interaction of a relativistic dense electron beam with a laser wiggler in a vacuum: self-field effects on the electron orbits and free-electron laser gain

2016 ◽  
Vol 23 (6) ◽  
pp. 1282-1295 ◽  
Author(s):  
E. Abbasi ◽  
S. Jafari ◽  
R. Hedayati
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Free Electron ◽  
Laser Pulses ◽  
Operating Regime ◽  
Light Sources ◽  
X Ray ◽  
Operation Conditions ◽  
Linearly Polarized ◽  
Dense Electron Beam

Employing laser wigglers and accelerators provides the potential to dramatically cut the size and cost of X-ray light sources. Owing to recent technological developments in the production of high-brilliance electron beams and high-power laser pulses, it is now conceivable to make steps toward the practical realisation of laser-pumped X-ray free-electron lasers (FELs). In this regard, here the head-on collision of a relativistic dense electron beam with a linearly polarized laser pulse as a wiggler is studied, in which the laser wiggler can be realised using a conventional quantum laser. In addition, an external guide magnetic field is employed to confine the electron beam against self-fields, therefore improving the FEL operation. Conditions allowing such an operating regime are presented and its relevant validity checked using a set of general scaling formulae. Rigorous analytical solutions of the dynamic equations are provided. These solutions are verified by performing calculations using the derived solutions and well known Runge–Kutta procedure to simulate the electron trajectories. The effects of self-fields on the FEL gain in this configuration are estimated. Numerical calculations indicate that in the presence of self-fields the sensitivity of the gain increases in the vicinity of resonance regions. Besides, diamagnetic and paramagnetic effects of the wiggler-induced self-magnetic field cause gain decrement and enhancement for different electron orbits, while these diamagnetic and paramagnetic effects increase with increasing beam density. The results are compared with findings of planar magnetostatic wiggler FELs.

PHOTOEMISSION BEAMLINE AT THE SIAM PHOTON LABORATORY

2001 ◽  
Vol 08 (05) ◽  
pp. 497-500 ◽  
Author(s):  
PRAYOON SONGSIRIRITTHIGUL ◽  
W. PAIRSUWAN ◽  
T. ISHII ◽  
A. KAKIZAKI
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Electronic Structures ◽  
X Ray ◽  
Surfaces And Interfaces ◽  
Photon Source

This report describes the first beamline for the Siam Photon Laboratory. The beamline has been designed to utilize synchrotron radiation in the VUV and soft X-ray regions generated by the Siam Photon Source. The beamline will be used for angle-resolved and high-resolution photoemission experiments to investigate electronic structures of surfaces and interfaces of solids.

scholarly journals A preliminary design of a knot undulator

2012 ◽  
Vol 20 (1) ◽  
pp. 145-152 ◽  
Author(s):  
Fuchun Xi ◽  
Tan Shi ◽  
Qingyan Fan ◽  
Soren Prestemon ◽  
Weishi Wan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Synchrotron Radiation ◽  
Field Configuration ◽  
Preliminary Design ◽  
Shanghai Synchrotron Radiation Facility ◽  
The Fourier Transform ◽  
The Impact ◽  
Elliptically Polarized ◽  
Theoretical Proposal ◽  
The Magnetic Field

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.

Determination of the electron beam size at the Kurchatov synchrotron radiation source using an X-ray refractive lens

2007 ◽  
Vol 1 (5) ◽  
pp. 528-532 ◽  
Author(s):  
A. N. Artemiev ◽  
A. A. Snigirev ◽  
V. N. Korchuganov ◽  
A. G. Valentinov ◽  
V. V. Kvardakov ◽  
...  
Keyword(s):  
Electron Beam ◽  
Synchrotron Radiation ◽  
Radiation Source ◽  
Synchrotron Radiation Source ◽  
Beam Size ◽  
X Ray ◽  
Refractive Lens
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