Photocathode electron gun

Author: cayf

August undefined, 2024

WebJan 1, 1989 · Yet another type of electron source is the RF photocathode gun [2], illustrated in figure 1.1. Instead of a thermionic cathode, a photocathode is installed in the 4 RF … WebJun 6, 2011 · The dc photocathode electron gun is designed for future light sources based on energy-recovery linac and consists of a Cockcroft-Walton generator, a segmented cylindrical ceramic insulator, guard ...

Development of an L-band photocathode RF gun at Tsinghua …

WebApr 23, 2024 · Morishita et al. addressed this problem to significantly improve LV SEM resolution by using a negative electron affinity (NEA) photocathode for a new type of electron gun. They built the photocathode using a p-type gallium arsenide (GaAs) coating and then initiated the NEA process by depositing cesium and oxygen, which were … WebOct 21, 2016 · These projects included an increasing demand for high brightness electron beams, which can be produced by photocathode RF guns. THU has been developing a 1.6 … mary brown nutritional information

Photocathode Electron Source Development at Advanced …

WebThe L-band drive RF photocathode gun produces both single-electron bunches as well as trains of electron bunches spaced at 1.3 GHz. In single-bunch operation, the drive gun … WebMar 1, 2024 · This Special Issue (SI) aims to summarize recent advances in nano/microscale thin-film photocathode materials across (but not limited to) the above-stated application fields with a focus on cathode materials and performances for light sources and detectors, novel particle accelerators, and ultrafast electron diffraction. Webcould be realized by developing a superconducting gun where the photocathode is an integral part of the initial accelerating cavity. The improved system we are developing, eliminates the need for a separate electron gun, and will utilize the cavityendwall itself as the integral photocathode. We have fabricated huntsville small business awards

USPAS Course on Photocathode Physics - Fermilab

DEVELOPMENT OF A NOVEL SUPERCONDUCTING RF …

WebJan 3, 2024 · Very high frequency (VHF) photocathode guns have excellent performance and are being increasingly selected as electron sources for high-repetition-rate X-ray free-electron lasers. As a highly loaded quality factor cavity, the VHF gun requires high stability in the amplitude and phase of the cavity field. However, the gun is microwave powered by … Webverification of the QE at the higher gun gradients. 2.2 Cavity Design An initial RF design of a cavity for use in the superconducting RF photocathode electron gun has also been completed. The design is based on the traditional elliptically shaped cavity in wide use today. The cavity is terminated with a flat endwall on which is located a small huntsville showWebThe photoinjector of short electron bunches is a key element of investigations aimed on particle acceleration by pulses of the subpetawatt laser PEARL (10 J, 50-70 fs). The projected parameters of the photoinjector are an electron energy level of 5 mary brown nashville nc

"WebMay 10, 2024 · The idea is to use pulses of a laser to strike a photo-emissive material—a material that emits electrons when struck with just the right wavelength, or color, of light—inside a photocathode electron gun. In the … " - Photocathode electron gun

Photocathode electron gun

Superconducting RF photocathode gun for low emittance …

WebOct 12, 2024 · The invention relates to a photocathode microwave electron gun, which comprises a plurality of acceleration cavities communicated mutually along the axis, a photocathode arranged on the axis of the acceleration cavity, a waveguide tube (102) communicated with the acceleration cavities, a cathode disc (121), and a vacuum cavity …

Did you know?

WebFeb 4, 2024 · In this scheme, the electron beam produced in a photocathode radio frequency (rf) gun first expands under its own Coulomb force with which a positive energy chirp is imprinted in the beam ... Webelectron gun satisfying such requirements, we are developing an NEA-GaAs photocathode DC-gun. The gun is based on an existing DC-gun of Japan Atomic Energy Agency (JAEA) ERL-FEL and designed to provide a beam with energy of 250 keV and average current of 50 mA. Conditioning of a high voltage power

WebA dependable and consistent electron source is a crucial requirement for the achievement of high-power free electron lasers (FELs). Over the past two decades, it has been … WebSep 17, 2024 · A C-band photocathode RF gun for a compact electron diffraction facility is developed at Tsinghua University, which is designed to work at the frequency of 5.712GHz. This paper presents the ...

WebQuantum Efficiency Measurements of a Copper Photocathode in an RF Electron Gun* P. Davis, G. Hairapetian, C. Clayton, C. Joshi Electrical ... up to 3 nC is produced from the electron gun. For 70” laser injection, p-polarized light results in a 50% increase in quantum efficiency over s-polnrized light probably due to their ... WebVHF Photocathode Electron Gun . We are developing a design for a high-brightness, high-repetition rate electron gun that uses a normal conducting RF structure in the VHF range, …

WebDec 12, 2024 · Time-resolved TEM in conjunction with a photocathode (PC)-type electron source pumped by a pulsed laser has been actively developed to exceed sub-nanosecond time resolution. Here, we provide an overview of the trends in this field and discuss the measurement targets that can be obtained by time-resolved measurements. ... The …

http://uspas.fnal.gov/materials/12UTA/Cathode_4.pdf huntsville sip and paintWebERL photocathode electron gun concerning the instal-lation of an external photocat hode preparation facility and replacement of the stem-mounted back-loading photo-cathode … huntsville small business officeWebNov 15, 2024 · Photocathode guns are the reliable—yet complex—electron sources they need. On Wednesday, Nov. 16, join accelerator physicist Erdong Wang of the EIC … huntsville smart thermostatsWebFEL. The Gun -I was the first SRF gun in the world to inject beam into an accelerator for FEL production [35] and the Gun -II is the first one in user operation [36]. Currently the . gun- II is providing more than 1000 hours beam time for the ELBE. 12th Int. Particle Acc. Conf. IPAC2024, Campinas, SP, Brazil JACoW Publishing ISBN: 978-3-95450 ... mary brown net worthWebphotocathode, an element of a photoelectric cell (q.v.) that emits electrons when struck by light, making possible the flow of electric current through the device. A substance often … mary brown obituary orlando flWebA 704 MHz superconducting RF photoemission electron gun for the R&D ERL project is under commissioning at BNL. Without a cathode insert, the SRF gun achieved its design … mary brown net worth 2021WebMar 19, 2012 · The electron bunches come from a photocathode, a rod inside the gun that throws off electrons when hit by photons from a laser. The laser beam enters the gun’s beam-exit port in the opposite direction from the electron beam it stimulates, and is aligned closely parallel to it. mary brown np parkersburg wv