scholarly journals Commissioning Results and Electron Beam Characterization with the S-Band Photoinjector at SINBAD-ARES

Instruments ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 28
Author(s):  
Eva Panofski ◽  
Ralph Assmann ◽  
Florian Burkart ◽  
Ulrich Dorda ◽  
Luca Genovese ◽  
...  
Keyword(s):  
Electron Beams ◽  
Industrial Applications ◽  
Momentum Spread ◽  
High Brightness ◽  
Measurement Results ◽  
Rf Photoinjector ◽  
Rf Gun ◽  
Beam Parameters ◽  
Laser Accelerators

Over the years, the generation and acceleration of ultra-short, high quality electron beams has attracted more and more interest in accelerator science. Electron bunches with these properties are necessary to operate and test novel diagnostics and advanced high-gradient accelerating schemes, such as plasma accelerators and dielectric laser accelerators. Furthermore, several medical and industrial applications require high-brightness electron beams. The dedicated R&D facility ARES at DESY (Deutsches Elektronen-Synchrotron) will provide such probe beams in the upcoming years. After the setup of the normal-conducting, radio-frequency (RF) photoinjector and linear accelerating structures, ARES successfully started the beam commissioning of the RF gun. This paper gives an overview of the ARES photoinjector setup and summarizes the results of the gun commissioning process. The quality of the first electron beams is characterized in terms of charge, momentum, momentum spread and beam size. Additionally, the dependencies of the beam parameters on RF settings are described. All measurement results of the characterized beams fulfill the requirements for operating the ARES linac with this RF photoinjector.

scholarly journals Electron beam control using experimentally measured transport matrices

1994 ◽  
Vol 12 (1) ◽  
pp. 17-21 ◽  
Author(s):  
C.B. McKee ◽  
John M.J. Madey
Keyword(s):  
Spatial Distribution ◽  
Electron Beam ◽  
Electron Accelerator ◽  
Electron Beams ◽  
Transport Systems ◽  
Evoked Responses ◽  
Free Electron Lasers ◽  
High Brightness ◽  
Electron Accelerators

Free electron lasers (FELs) place very stringent requirements on the quality of electron beams. Present techniques for commissioning and operating electron accelerators may not be optimized to produce the high brightness beams needed. Therefore, it is proposed to minimize the beamline errors in electron accelerator transport systems by minimizing the deviations between the experimentally measured and design transport matrices of each beamline section. The transport matrix for each section is measured using evoked responses. In addition, the transverse phase space of the beam is reconstructed by measuring the spatial distribution of the electrons at a number of different betatron phases and applying tomographic techniques developed for medical imaging.

HIGH BRIGHTNESS BEAMS — APPLICATIONS TO FREE-ELECTRON LASERS

2007 ◽  
Vol 22 (22) ◽  
pp. 3912-3924
Author(s):  
SVEN REICHE
Keyword(s):  
Free Electron ◽  
Beam Quality ◽  
Beam Parameter ◽  
Free Electron Lasers ◽  
High Quality ◽  
High Brightness ◽  
Radiation Sources ◽  
Beam Parameters ◽  
The Impact

Free-Electron Lasers as high-brilliance radiation sources, rely on a high quality of the electron beam driving the FEL process. The amount of energy, transferred from the electrons to the radiation field, and thus the efficiency of the FEL depends on the provided beam parameters. The presentation discusses the impact of various beam parameter and how current designs of FEL injector try to accomplish the demands on the beam quality for reaching saturation.

scholarly journals Overview of the Semiconductor Photocathode Research in China

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1376
Author(s):  
Huamu Xie
Keyword(s):  
Free Electron Laser ◽  
Electron Beams ◽  
Spectral Response ◽  
Ultrafast Electron Diffraction ◽  
High Brightness ◽  
X Ray ◽  
Rf Gun ◽  
Long Lifetime ◽  
Diffraction Microscopy ◽  
Electron Diffraction Microscopy

With the growing demand from scientific projects such as the X-ray free electron laser (XFEL), ultrafast electron diffraction/microscopy (UED/UEM) and electron ion collider (EIC), the semiconductor photocathode, which is a key technique for a high brightness electron source, has been widely studied in China. Several fabrication systems have been designed and constructed in different institutes and the vacuum of most systems is in the low 10−8 Pa level to grow a high QE and long lifetime photocathode. The QE, dark lifetime/bunch lifetime, spectral response and QE map of photocathodes with different kinds of materials, such as bialkali (K2CsSb, K2NaSb, etc.), Cs2Te and GaAs, have been investigated. These photocathodes will be used to deliver electron beams in a high voltage DC gun, a normal conducting RF gun, and an SRF gun. The emission physics of the semiconductor photocathode and intrinsic emittance reduction are also studied.

scholarly journals Smoothing additive manufactured parts using ns-pulsed laser radiation

2021 ◽  
Author(s):  
Florian Kuisat ◽  
Fernando Lasagni ◽  
Andrés Fabián Lasagni
Keyword(s):  
Surface Roughness ◽  
Mechanical Performance ◽  
State Of The Art ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Laser Source ◽  
Pulsed Laser Radiation ◽  
Current State ◽  
The Impact

AbstractIt is well known that the surface topography of a part can affect its mechanical performance, which is typical in additive manufacturing. In this context, we report about the surface modification of additive manufactured components made of Titanium 64 (Ti64) and Scalmalloy®, using a pulsed laser, with the aim of reducing their surface roughness. In our experiments, a nanosecond-pulsed infrared laser source with variable pulse durations between 8 and 200 ns was applied. The impact of varying a large number of parameters on the surface quality of the smoothed areas was investigated. The results demonstrated a reduction of surface roughness Sa by more than 80% for Titanium 64 and by 65% for Scalmalloy® samples. This allows to extend the applicability of additive manufactured components beyond the current state of the art and break new ground for the application in various industrial applications such as in aerospace.

scholarly journals Single-shot reconstruction of core 4D phase space of high-brightness electron beams using metal grids

2018 ◽  
Vol 21 (10) ◽  
Author(s):  
D. Marx ◽  
J. Giner Navarro ◽  
D. Cesar ◽  
J. Maxson ◽  
B. Marchetti ◽  
...  
Keyword(s):  
Phase Space ◽  
Electron Beams ◽  
Single Shot ◽  
High Brightness
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