Electron sources utilizing thin CsBr coatings

Maldonado, Juan R.; Liu, Zhi; Dowell, D.H.; Kirby, Robert E.; Sun, Yun; Pianetta, P.; Pease, Fabian

doi:10.1016/j.mee.2008.11.063

Cited by 15 publications

(20 citation statements)

References 6 publications

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“…Furthermore the photocathode was exposed to air several more times because the gun had a leak that required venting to fix. As expected, the CsBr survived these exposures [11], illustrating that CsBr photocathodes are well suited for rf guns that do not contain a photocathode transfer system.…”

Section: Methodssupporting

confidence: 75%

High gradient rf gun studies of CsBr photocathodes

Vecchione

Maldonado

Gierman

et al. 2015

Phys. Rev. ST Accel. Beams

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CsBr photocathodes have 10 times higher quantum efficiency with only 3 times larger intrinsic transverse emittance than copper. They are robust and can withstand 80 MV=m fields without breaking down or emitting dark current. They can operate in 2 × 10 −9 torr vacuum and survive exposure to air. They are well suited for generating high pulse charge in rf guns without a photocathode transfer system.

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Section: Methodssupporting

confidence: 75%

High gradient rf gun studies of CsBr photocathodes

Vecchione

Maldonado

Gierman

et al. 2015

Phys. Rev. ST Accel. Beams

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“…Current proposals for new photocathode materials include alkali halide films supported on metal substrates. It is thought that the F -centres are the main source of emitted electrons (Maldonado et al 2009). Our results suggest that the near-surface region in reduced C12A7 may host such vacancy-like gap states at concentrations of 10 21 cm −3 and, being interfaced with a metal substrate, may perform as a bright photocathode.…”

Section: (B) Surface Structuresmentioning

confidence: 99%

Models of stoichiometric and oxygen-deficient surfaces of subnanoporous 12CaO·7Al ₂ O ₃

et al. 2011

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Surface structures of stoichiometric and oxygen-deficient complex subnanoporous oxide 12CaO·7Al 2 O 3 (C12A7) are generated by simulating lattice rupture under the influence of an external strain. Extra-framework anions are found to serve as buffers, maintaining stability of the lattice cages in both elastic and inelastic stretching regimes. Modification of the local atomic structure in the near-surface region reduces the band gap in stoichiometric insulating C12A7. On the contrary, the band gap appears in the oxygendeficient form of C12A7, which is metallic in the bulk. This is due to formation of the surface electron traps, which differ both in the type of the local atomic structure and stability of the electronic states. The implications of this electronic structure for the surface chemical and electron emission properties are discussed.

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“…In order to overcome limitations of metal photocathodes, several approaches have been explored. These include incorporation of nanostructured features, such as gratings and nanohole arrays, to couple light efficiently into the metal and induce surfaceplasmon enhanced electric fields [2][3][4], utilizing ultrathin oxide layers to reduce work function [5], and deposition of alkali halide films to increase QE [6][7][8][9][10]. Alkali halide thin film deposition has been proven to be one of the most effective ways to lower work function and increase QE of metal photocathodes.…”

Section: Introductionmentioning

confidence: 99%

Quantum efficiency enhancement in CsI/metal photocathodes

Kong

Joly

Droubay

et al. 2015

Chemical Physics Letters

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a b s t r a c tHigh quantum efficiency enhancement is found for hybrid metal-insulator photocathodes consisting of thin films of CsI deposited on Cu(1 0 0), Ag(1 0 0), Au(1 1 1) and Au films irradiated by 266 nm laser pulses. Low work functions (near or below 2 eV) are observed following ultraviolet laser activation. Work functions are reduced by roughly 3 eV from that of clean metal surfaces. We discuss various mechanisms of quantum efficiency enhancement for alkali halide/metal photocathode systems and conclude that the large change in work function, due to Cs accumulation of Cs metal at the metal-alkali halide interface, is the dominant mechanism for quantum efficiency enhancement.

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Electron sources utilizing thin CsBr coatings

Cited by 15 publications

References 6 publications

High gradient rf gun studies of CsBr photocathodes

High gradient rf gun studies of CsBr photocathodes

Models of stoichiometric and oxygen-deficient surfaces of subnanoporous 12CaO·7Al ₂ O ₃

Quantum efficiency enhancement in CsI/metal photocathodes

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Electron sources utilizing thin CsBr coatings

Cited by 15 publications

References 6 publications

High gradient rf gun studies of CsBr photocathodes

High gradient rf gun studies of CsBr photocathodes

Models of stoichiometric and oxygen-deficient surfaces of subnanoporous 12CaO·7Al 2 O 3

Quantum efficiency enhancement in CsI/metal photocathodes

Contact Info

Product

Resources

About

Models of stoichiometric and oxygen-deficient surfaces of subnanoporous 12CaO·7Al ₂ O ₃