Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes

Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes

The thermally assisted photoemission (TAPE) effect was investigated for the hexaboride thermionic cathodes (LaB_{6} and CeB_{6}). It was found that the quantum efficiency of these cathodes can be increased by raising the cathode temperature along with the thermionic emission. In addition both materi...

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Main Authors: K. Torgasin, K. Morita, H. Zen, K. Masuda, T. Katsurayama, T. Murata, S. Suphakul, H. Yamashita, T. Nogi, T. Kii, K. Nagasaki, H. Ohgaki
Format: Article
Language:English
Published: American Physical Society 2017-07-01
Series:Physical Review Accelerators and Beams
Online Access:http://doi.org/10.1103/PhysRevAccelBeams.20.073401
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spelling doaj-ac2cff31e5f442ffbd0d1d28a4ca1b9f2020-11-25T01:42:31ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882017-07-0120707340110.1103/PhysRevAccelBeams.20.073401Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodesK. TorgasinK. MoritaH. ZenK. MasudaT. KatsurayamaT. MurataS. SuphakulH. YamashitaT. NogiT. KiiK. NagasakiH. OhgakiThe thermally assisted photoemission (TAPE) effect was investigated for the hexaboride thermionic cathodes (LaB_{6} and CeB_{6}). It was found that the quantum efficiency of these cathodes can be increased by raising the cathode temperature along with the thermionic emission. In addition both materials can emit a measurable photoemission current by being irradiated with a laser having a photon energy below the work function at sufficiently high cathode temperatures. Our measurements indicate that this process is linear. These results show the significance of the TAPE effect. An additional effect of cathode heating is surface cleaning. This effect was detected as the hysteresis of the quantum efficiency which can be observed by heating up and cooling down the cathode. This effect slightly changes the quantum efficiency but not as much as the TAPE effect.http://doi.org/10.1103/PhysRevAccelBeams.20.073401
collection DOAJ
language English
format Article
sources DOAJ
author K. Torgasin
K. Morita
H. Zen
K. Masuda
T. Katsurayama
T. Murata
S. Suphakul
H. Yamashita
T. Nogi
T. Kii
K. Nagasaki
H. Ohgaki
spellingShingle K. Torgasin
K. Morita
H. Zen
K. Masuda
T. Katsurayama
T. Murata
S. Suphakul
H. Yamashita
T. Nogi
T. Kii
K. Nagasaki
H. Ohgaki
Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes
Physical Review Accelerators and Beams
author_facet K. Torgasin
K. Morita
H. Zen
K. Masuda
T. Katsurayama
T. Murata
S. Suphakul
H. Yamashita
T. Nogi
T. Kii
K. Nagasaki
H. Ohgaki
author_sort K. Torgasin
title Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes
title_short Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes
title_full Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes
title_fullStr Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes
title_full_unstemmed Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes
title_sort thermally assisted photoemission effect on ceb_{6} and lab_{6} for application as photocathodes
publisher American Physical Society
series Physical Review Accelerators and Beams
issn 2469-9888
publishDate 2017-07-01
description The thermally assisted photoemission (TAPE) effect was investigated for the hexaboride thermionic cathodes (LaB_{6} and CeB_{6}). It was found that the quantum efficiency of these cathodes can be increased by raising the cathode temperature along with the thermionic emission. In addition both materials can emit a measurable photoemission current by being irradiated with a laser having a photon energy below the work function at sufficiently high cathode temperatures. Our measurements indicate that this process is linear. These results show the significance of the TAPE effect. An additional effect of cathode heating is surface cleaning. This effect was detected as the hysteresis of the quantum efficiency which can be observed by heating up and cooling down the cathode. This effect slightly changes the quantum efficiency but not as much as the TAPE effect.
url http://doi.org/10.1103/PhysRevAccelBeams.20.073401
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