scholarly journals Single shot time stamping of ultrabright radio frequency compressed electron pulses

2013 ◽  
Vol 103 (3) ◽  
pp. 033503 ◽  
Author(s):  
M. Gao ◽  
Y. Jiang ◽  
G. H. Kassier ◽  
R. J. Dwayne Miller
Keyword(s):  
Radio Frequency ◽  
Single Shot ◽  
Electron Pulses

Relativistic Attosecond Electron Pulses from a Photocathode Radio-Frequency Gun

2021 ◽  
Vol 16 (5) ◽  
Author(s):  
Cheng Li ◽  
Wenxing Wang ◽  
Haoran Zhang ◽  
Zixin Guo ◽  
Shimin Jiang ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Electron Pulses

scholarly journals Multiclass Radio Frequency Interference Detection and Suppression for SAR Based on the Single Shot MultiBox Detector

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 4034 ◽  
Author(s):  
Junfei Yu ◽  
Jingwen Li ◽  
Bing Sun ◽  
Jie Chen ◽  
Chunsheng Li
Keyword(s):  
Radio Frequency ◽  
Pulse Compression ◽  
Radio Frequency Interference ◽  
Single Shot ◽  
Separation Problem ◽  
Underdetermined Blind Source Separation ◽  
Time Frequency ◽  
Interference Signals ◽  
Novel Method ◽  
Short Time

Radio frequency interference (RFI) is known to jam synthetic aperture radar (SAR) measurements, severely degrading the SAR imaging quality. The suppression of RFI in SAR echo signals is usually an underdetermined blind source separation problem. In this paper, we propose a novel method for multiclass RFI detection and suppression based on the single shot multibox detector (SSD). First, an echo-interference dataset is established by randomly combining the target signal with various types of RFI in a simulation, and the time–frequency form of the dataset is obtained by utilizing the short-time Fourier transform (STFT). Next, the time–frequency dataset acts as input data to train the SSD and obtain a network that is capable of detecting, identifying and estimating the interference. Finally, all of the interference signals are exactly reconstructed based on the prediction results of the SSD and mitigated by an adaptive filter. The proposed method can effectively increase the signal-to-interference-noise ratio (SINR) of RFI-contaminated SAR echoes and improve the peak sidelobe ratio (PSLR) after pulse compression. The simulated experimental results validate the effectiveness of the proposed method.

scholarly journals Relativistic Ultrafast Electron Microscopy: Single-Shot Diffraction Imaging with Femtosecond Electron Pulses

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Jinfeng Yang ◽  
Yoichi Yoshida
Keyword(s):  
Electron Microscopy ◽  
Spatial Coherence ◽  
Single Shot ◽  
Mean Square ◽  
High Quality ◽  
Excellent Spatial Resolution ◽  
Diffraction Imaging ◽  
Imaging Methodology ◽  
Femtosecond Electron Pulses ◽  
Electron Pulses

We report on a single-shot diffraction imaging methodology using relativistic femtosecond electron pulses generated by a radio-frequency acceleration-based photoemission gun. The electron pulses exhibit excellent characteristics, including a root-mean-square (rms) illumination convergence of 31 ± 2 μrad, a spatial coherence length of 5.6 ± 0.4 nm, and a pulse duration of approximately 100 fs with (6.3 ± 0.6) × 106 electrons per pulse at 3.1 MeV energy. These pulses facilitate high-quality diffraction images of gold single crystals with a single shot. The rms spot width of the diffracted beams was obtained as 0.018 ± 0.001 Å−1, indicating excellent spatial resolution.

scholarly journals Single shot charge detection using a radio-frequency quantum point contact

2007 ◽  
Vol 91 (22) ◽  
pp. 222104 ◽  
Author(s):  
M. C. Cassidy ◽  
A. S. Dzurak ◽  
R. G. Clark ◽  
K. D. Petersson ◽  
I. Farrer ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Single Shot ◽  
Charge Detection ◽  
Quantum Point

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

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

Novel Radio-Frequency Gun Structures for Ultrafast Relativistic Electron Diffraction

2009 ◽  
Vol 15 (4) ◽  
pp. 290-297 ◽  
Author(s):  
P. Musumeci ◽  
L. Faillace ◽  
A. Fukasawa ◽  
J.T. Moody ◽  
B. O'Shea ◽  
...  
Keyword(s):  
Los Angeles ◽  
Electron Diffraction ◽  
Radio Frequency ◽  
Structural Changes ◽  
National Laboratory ◽  
Experimental Tests ◽  
Brookhaven National Laboratory ◽  
Atomic Scale ◽  
Single Shot ◽  
Rf Photoinjector

AbstractRadio-frequency (RF) photoinjector-based relativistic ultrafast electron diffraction (UED) is a promising new technique that has the potential to probe structural changes at the atomic scale with sub-100 fs temporal resolution in a single shot. We analyze the limitations on the temporal and spatial resolution of this technique considering the operating parameters of a standard 1.6 cell RF gun (which is the RF photoinjector used for the first experimental tests of relativistic UED at Stanford Linear Accelerator Center; University of California, Los Angeles; Brookhaven National Laboratory), and study the possibility of employing novel RF structures to circumvent some of these limits.

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