41 research outputs found
Time-resolved Measurement of Quadrupole Wakefields in Corrugated Structures
Corrugated structures have recently been widely used for manipulating
electron beam longitudinal phase space and for producing THz radiation. Here we
report on time-resolved measurements of the quadrupole wakefields in planar
corrugated structures. It is shown that while the time- dependent quadrupole
wakefield produced by a planar corrugated structure causes significant growth
in beam transverse emittance, it can be effectively canceled with a second
corrugated structure with orthogonal orientation. The strengths of the
time-dependent quadrupole wakefields for various corrugated structure gaps are
also measured and found to be in good agreement with theories. Our work should
forward the applications of corrugated structures in many accelerator based
scientific facilities
Few-femtosecond Electron Beam with THz-frequency Wakefield-driven Compression
We propose and demonstrate a novel method to produce few-femtosecond electron
beam with relatively low timing jitter. In this method a relativistic electron
beam is compressed from about 150 fs (rms) to about 7 fs (rms, upper limit)
with the wakefield at THz frequency produced by a leading drive beam in a
dielectric tube. By imprinting the energy chirp in a passive way, we
demonstrate through laser-driven THz streaking technique that no additional
timing jitter with respect to an external laser is introduced in this bunch
compression process, a prominent advantage over the conventional method using
radio-frequency bunchers. We expect that this passive bunching technique may
enable new opportunities in many ultrashort-beam based advanced applications
such as ultrafast electron diffraction and plasma wakefield acceleration.Comment: 5 pages, 4 figure
Progress of Ginsenoside Rb1 in neurological disorders
Ginseng is frequently used in traditional Chinese medicine to treat neurological disorders. The primary active component of ginseng is ginsenoside, which has been classified into more than 110 types based on their chemical structures. Ginsenoside Rb1 (GsRb1)—a protopanaxadiol saponin and a typical ginseng component—exhibits anti-inflammatory, anti-oxidant, anti-apoptotic, and anti-autophagy properties in the nervous system. Neurological disorders remain a leading cause of death and disability globally. GsRb1 effectively treats neurological disorders. To contribute novel insights to the understanding and treatment of neurological disorders, we present a comprehensive review of the pharmacokinetics, actions, mechanisms, and research development of GsRb1 in neurological disorders