Thermally assisted photoemission effect on 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CeB</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
 and 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>LaB</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
 for application as photocathodes

Torgasin, Konstantin; Morita, Kohei; Zen, Heishun; Masuda, Kazuyoshi; Katsurayama, Tsubasa; Murata, Tetsuyuki; Suphakul, Sikharin; Yamashita, Hiroshi; Nogi, Takeshi; Kii, Toshiteru; Nagasaki, K.; Ohgaki, Hideaki

doi:10.1103/physrevaccelbeams.20.073401

Cited by 19 publications

(10 citation statements)

References 11 publications

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“…The LaB 6 cathode can be operated as a photocathode when the cathode is heated up to a temperature below the threshold of thermionic emission and illuminated by UV laser pulses. [12][13][14][15][16] The RF gun was equipped with a multibunch 266 nm UV laser system for photocathode-mode operation. 17,18) The macropulse energy, macropulse duration and micropulse repetition rate of the UV laser used in this study were ∼5 mJ, 7 μs, and 29.75 MHz, respectively.…”

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confidence: 99%

Record high extraction efficiency of free electron laser oscillator

Zen

Ohgaki

Hajima

2020

Appl. Phys. Express

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The highest extraction efficiency (9.4%) of a free electron laser (FEL) oscillator has been achieved at the midinfrared FEL facility of Kyoto University. Because of the interaction between the electron beam and FEL electromagnetic field, a maximum electron energy decrease of 16% was observed. The measured energy decrease was consistent with the measured FEL spectrum. An FEL micropulse energy of ∼100 μJ with the expected few-cycle pulse duration at a wavelength of 11 μm was observed. This result is an important milestone for the high-extraction-efficiency FEL oscillator and will contribute to the strong-field physics of atoms and molecules.

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confidence: 99%

Record high extraction efficiency of free electron laser oscillator

Zen

Ohgaki

Hajima

2020

Appl. Phys. Express

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“…1d), the large drop in Z will more than offset these gains. 62,63 Therefore, another parameter must be adjusted in order to again increase I pe , likely again at the expense of another beam property. These synergistic effects illustrate the need for a detailed, methodical, and systematic approach, as taken here.…”

Section: Ce As a Function Of D W For A Fixed Laser Spot Sizementioning

confidence: 99%

Single-photoelectron collection efficiency in 4D ultrafast electron microscopy

Curtis

Willis

Flannigan

2022

Phys. Chem. Chem. Phys.

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“…Lanthanum hexaboride () was eventually selected for its low work function (2.7 eV) (Torgasin et al. 2017); also has a high electroemissivity and is regularly used as a base material for cathodes. This selection of material satisfied our optimization criteria, however, it also introduced a new obstacle.…”

Section: Experimental Set-upmentioning

confidence: 99%

Controlled photo-discharge of dust in a complex plasma

McKinlay

Thomas

2021

J. Plasma Phys.

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One of the limitations in studying dusty plasmas is that many of the important properties of the dust (like the charge) are directly coupled to the surrounding plasma conditions rather than being determined independently. The application of high-intensity ultraviolet (UV) sources to generate discharging photoelectric currents may provide an avenue for developing methods of controlling dust charge. Careful selection of the parameters of the UV source and dust material may even allow for this to be accomplished with minimal perturbation of the background plasma. The Auburn Magnetized Plasma Research Laboratory (MPRL) has developed a ‘proof-of-concept’ experiment for this controlled photo-discharging of dust; a high-intensity, near-UV source was used to produce large changes in the equilibrium positions of lanthanum hexaboride ( $\textrm {LaB}_6$ ) particles suspended in an argon DC glow discharge with negligible changes in the potential, density and temperature profiles of the background plasma. The shifts in equilibrium position of the dust are consistent with a reduction in dust charge. Video analysis is used to quantify the changes in position, velocity and acceleration of a test particle under the influence of the UV and Langmuir probes are used to measure the effects on the plasma.

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Thermally assisted photoemission effect on CeB6 and LaB6 for application as photocathodes

Cited by 19 publications

References 11 publications

Record high extraction efficiency of free electron laser oscillator

Record high extraction efficiency of free electron laser oscillator

Single-photoelectron collection efficiency in 4D ultrafast electron microscopy

Controlled photo-discharge of dust in a complex plasma

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