scholarly journals Measurement of beam energy spread in a space-charge dominated electron beam

2004 ◽  
Vol 7 (7) ◽  
Author(s):  
Y. Cui ◽  
Y. Zou ◽  
M. Reiser ◽  
R. A. Kishek ◽  
I. Haber ◽  
...  
Keyword(s):  
Electron Beam ◽  
Space Charge ◽  
Beam Energy ◽  
Energy Spread

scholarly journals Control of electron beam energy-spread by beam loading effects in a laser-plasma accelerator

2020 ◽  
Vol 62 (5) ◽  
pp. 055004 ◽  
Author(s):  
Guangyu Li ◽  
Quratul Ain ◽  
Song Li ◽  
Muhammad Saeed ◽  
Daniel Papp ◽  
...  
Keyword(s):  
Electron Beam ◽  
Laser Plasma ◽  
Beam Energy ◽  
Plasma Accelerator ◽  
Energy Spread ◽  
Electron Beam Energy ◽  
Beam Loading ◽  
Loading Effects ◽  
Laser Plasma Accelerator

scholarly journals Estimation of the Electron Beam Energy Spread for TEM Information Limit

2002 ◽  
Vol 8 (S02) ◽  
pp. 480-481 ◽  
Author(s):  
Michael A. O'Keefe ◽  
Peter C. Tiemeijer ◽  
Maxim V. Sidorov
Keyword(s):  
Electron Beam ◽  
Beam Energy ◽  
Energy Spread ◽  
Electron Beam Energy

scholarly journals Toward monochromated sub-nanometer UEM and femtosecond UED

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Xi Yang ◽  
Weishi Wan ◽  
Lijun Wu ◽  
Victor Smaluk ◽  
Timur Shaftan ◽  
...  
Keyword(s):  
Electron Beam ◽  
Real Time ◽  
Beam Energy ◽  
Path Length ◽  
Energy Spread ◽  
Single Shot ◽  
Accumulation Mode ◽  
Length Difference ◽  
Path Length Difference ◽  
Energy Dependent

Abstract A preliminary design of a mega-electron-volt (MeV) monochromator with 10−5 energy spread for ultrafast electron diffraction (UED) and ultrafast electron microscopy (UEM) is presented. Such a narrow energy spread is advantageous in both the single shot mode, where the momentum resolution in diffraction is improved, and the accumulation mode, where shot-to-shot energy jitter is reduced. In the single-shot mode, we numerically optimized the monochromator efficiency up to 13% achieving 1.3 million electrons per pulse. In the accumulation mode, to mitigate the efficiency degradation caused by the shot-to-shot energy jitter, an optimized gun phase yields only a mild reduction of the single-shot efficiency, therefore the number of accumulated electrons nearly proportional to the repetition rate. Inspired by the recent work of Qi et al. (Phys Rev Lett 124:134803, 2020), a novel concept of applying reverse bending magnets to adjust the energy-dependent path length difference has been successfully realized in designing a MeV monochromator to achieve the minimum energy-dependent path length difference between cathode and sample. Thanks to the achromat design, the pulse length of the electron bunches and the energy-dependent timing jitter can be greatly reduced to the 10 fs level. The introduction of such a monochromator provides a major step forward, towards constructing a UEM with sub-nm resolution and a UED with ten-femtosecond temporal resolution. The one-to-one mapping between the electron beam parameter and the diffraction peak broadening enables a real-time nondestructive diagnosis of the beam energy spread and divergence. The tunable electric–magnetic monochromator allows the scanning of the electron beam energy with a 10−5 precision, enabling online energy matching for the UEM, on-momentum flux maximizing for the UED and real-time energy measuring for energy-loss spectroscopy. A combination of the monochromator and a downstream chicane enables “two-color” double pulses with femtosecond duration and the tunable delay in the range of 10 to 160 fs, which can potentially provide an unprecedented femtosecond time resolution for time resolved UED.

scholarly journals A novel nondestructive diagnostic method for mega-electron-volt ultrafast electron diffraction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Xi Yang ◽  
Junjie Li ◽  
Mikhail Fedurin ◽  
Victor Smaluk ◽  
Lihua Yu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Real Time ◽  
Beam Energy ◽  
Energy Spread ◽  
Radial Mode ◽  
Electron Beam Energy ◽  
Ultrafast Electron Diffraction ◽  
Electron Volt

AbstractA real-time, nondestructive, Bragg-diffracted electron beam energy, energy-spread and spatial-pointing jitter monitor is experimentally verified by encoding the electron beam energy and spatial-pointing jitter information into the mega-electron-volt ultrafast electron diffraction pattern. The shot-to-shot fluctuation of the diffraction pattern is then decomposed to two basic modes, i.e., the distance between the Bragg peaks as well as its variation (radial mode) and the overall lateral shift of the whole pattern (drift mode). Since these two modes are completely decoupled, the Bragg-diffraction method can simultaneously measure the shot-to-shot energy fluctuation from the radial mode with 2·10−4 precision and spatial-pointing jitter from the drift mode having wide measurement span covering energy jitter range from 10−4 to 10−1. The key advantage of this method is that it allows us to extract the electron beam energy spread concurrently with the ongoing experiment and enables online optimization of the electron beam especially for future high charge single-shot ultrafast electron diffraction (UED) and ultrafast electron microscopy (UEM) experiments. Furthermore, real-time energy measurement enables the filtering process to remove off-energy shots, improving the resolution of time-resolved UED. As a result, this method can be applied to the entire UED user community, beyond the traditional electron beam diagnostics of accelerators used by accelerator physicists.

scholarly journals Compensating the electron beam energy spread by the natural transverse gradient of laser undulator in all-optical x-ray light sources

2014 ◽  
Vol 22 (11) ◽  
pp. 13880 ◽  
Author(s):  
Tong Zhang ◽  
Chao Feng ◽  
Haixiao Deng ◽  
Dong Wang ◽  
Zhimin Dai ◽  
...  
Keyword(s):  
Electron Beam ◽  
Beam Energy ◽  
Energy Spread ◽  
Light Sources ◽  
Electron Beam Energy ◽  
X Ray ◽  
All Optical ◽  
Transverse Gradient ◽  
Natural Transverse

scholarly journals Undulator-Based Laser Wakefield Accelerator Electron Beam Energy Spread and Emittance Diagnostic

2010 ◽  
Author(s):  
M. S. Bakeman ◽  
J. Van Tilborg ◽  
K. Nakamura ◽  
A. Gonsalves ◽  
J. Osterhoff ◽  
...  
Keyword(s):  
Electron Beam ◽  
Beam Energy ◽  
Energy Spread ◽  
Electron Beam Energy ◽  
Laser Wakefield ◽  
Wakefield Accelerator ◽  
Laser Wakefield Accelerator
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