High quality single shot diffraction patterns using ultrashort megaelectron volt electron beams from a radio frequency photoinjector

2010 ◽  
Vol 81 (1) ◽  
pp. 013306 ◽  
Author(s):  
P. Musumeci ◽  
J. T. Moody ◽  
C. M. Scoby ◽  
M. S. Gutierrez ◽  
H. A. Bender ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Electron Beams ◽  
Single Shot ◽  
High Quality ◽  
Diffraction Patterns

scholarly journals THz-Enhanced DC Ultrafast Electron Diffractometer

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Dongfang Zhang ◽  
Tobias Kroh ◽  
Felix Ritzkowsky ◽  
Timm Rohwer ◽  
Moein Fakhari ◽  
...  
Keyword(s):  
Structural Dynamics ◽  
Pulse Compression ◽  
Electron Beams ◽  
Single Crystal Silicon ◽  
High Quality ◽  
Crystal Silicon ◽  
Electron Sources ◽  
Electron Bunches ◽  
Diffraction Patterns ◽  
Proof Of Principle

Terahertz- (THz-) based electron manipulation has recently been shown to hold tremendous promise as a technology for manipulating and driving the next generation of compact ultrafast electron sources. Here, we demonstrate an ultrafast electron diffractometer with THz-driven pulse compression. The electron bunches from a conventional DC gun are compressed by a factor of 10 and reach a duration of ~180 fs (FWHM) with 10,000 electrons/pulse at a 1 kHz repetition rate. The resulting ultrafast electron source is used in a proof-of-principle experiment to probe the photoinduced dynamics of single-crystal silicon. The THz-compressed electron beams produce high-quality diffraction patterns and enable the observation of the ultrafast structural dynamics with improved time resolution. These results validate the maturity of THz-driven ultrafast electron sources for use in precision applications.

High quality single shot ultrafast MeV electron diffraction from a photocathode radio-frequency gun

2014 ◽  
Vol 85 (8) ◽  
pp. 083701 ◽  
Author(s):  
Feichao Fu ◽  
Shengguang Liu ◽  
Pengfei Zhu ◽  
Dao Xiang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Radio Frequency ◽  
Single Shot ◽  
High Quality

scholarly journals Effects in the Optical and Structural Properties Caused by Mg or Zn Doping of GaN Films Grown via Radio-Frequency Magnetron Sputtering Using Laboratory-Prepared Targets

2021 ◽  
Vol 11 (15) ◽  
pp. 6990
Author(s):  
Erick Gastellóu ◽  
Godofredo García ◽  
Ana María Herrera ◽  
Crisoforo Morales ◽  
Rafael García ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Hexagonal Structure ◽  
Binding Energies ◽  
Radio Frequency Magnetron ◽  
Radio Frequency Magnetron Sputtering ◽  
X Ray ◽  
Diffraction Patterns ◽  
Mg Doped

GaN films doped with Mg or Zn were obtained via radio-frequency magnetron sputtering on silicon substrates at room temperature and used laboratory-prepared targets with Mg-doped or Zn-doped GaN powders. X-ray diffraction patterns showed broadening peaks, which could have been related to the appearance of nano-crystallites with an average of 7 nm. Scanning electron microscopy and transmission electron microscopy showed good adherence to silicon non-native substrate, as well as homogeneity, with a grain size average of 0.14 µm, and 0.16 µm for the GaN films doped with Zn or Mg, respectively. X-ray photo-electron spectroscopy demonstrated the presence of a very small amount of magnesium (2.10 mol%), and zinc (1.15 mol%) with binding energies of 1303.18, and 1024.76 eV, respectively. Photoluminescence spectrum for the Zn-doped GaN films had an emission range from 2.89 to 3.0 eV (429.23–413.50 nm), while Mg-doped GaN films had an energy emission in a blue-violet band with a range from 2.80 to 3.16 eV (443.03–392.56 nm). Raman spectra showed the classical vibration modes A1(TO), E1(TO), and E2(High) for the hexagonal structure of GaN.

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

scholarly journals Long lifetime of bialkali photocathodes operating in high gradient superconducting radio frequency gun

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
E. Wang ◽  
V. N. Litvinenko ◽  
I. Pinayev ◽  
M. Gaowei ◽  
J. Skaritka ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Electron Beams ◽  
Spot Size ◽  
Laser Spot ◽  
Laser Spot Size ◽  
High Quantum Efficiency ◽  
High Brightness ◽  
High Charge ◽  
Superconducting Radio Frequency ◽  
Long Lifetime

AbstractHigh brightness, high charge electron beams are critical for a number of advanced accelerator applications. The initial emittance of the electron beam, which is determined by the mean transverse energy (MTE) and laser spot size, is one of the most important parameters determining the beam quality. The bialkali photocathodes illuminated by a visible laser have the advantages of high quantum efficiency (QE) and low MTE. Furthermore, Superconducting Radio Frequency (SRF) guns can operate in the continuous wave (CW) mode at high accelerating gradients, e.g. with significant reduction of the laser spot size at the photocathode. Combining the bialkali photocathode with the SRF gun enables generation of high charge, high brightness, and possibly high average current electron beams. However, integrating the high QE semiconductor photocathode into the SRF guns has been challenging. In this article, we report on the development of bialkali photocathodes for successful operation in the SRF gun with months-long lifetime while delivering CW beams with nano-coulomb charge per bunch. This achievement opens a new era for high charge, high brightness CW electron beams.

scholarly journals High-quality electron beams from a helical inverse free-electron laser accelerator

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
J. Duris ◽  
P. Musumeci ◽  
M. Babzien ◽  
M. Fedurin ◽  
K. Kusche ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Electron Beams ◽  
High Quality ◽  
Laser Accelerator
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