IPAC2014 - List of Authors (Hayashizaki, N.)

Paper	Title	Page
MOPRI009	Study on New Method for Generating Highly Charged Ions with Double Pulse Laser Ion Source	595
SUSPSNE029	use link to see paper's listing under its alternate paper code
	T. Shibuya TIT, Tokyo, Japan N. Hayashizaki RLNR, Tokyo, Japan M. Yoshida KEK, Ibaraki, Japan
	Laser ion source capable of generating high intensity ions is best for the ion source of RI beam facilities. A great deal of effort has been made on particle number as DPIS. Only few attempts have so far been made at generating highly charged ions. One of previous research has reported that Au+53 ions are produced by PALS laser. "Nonlinear process" mechanisms such as resonance absorption and self-focusing were used for this. However, these methods have limitation due to low repetition rate of the laser. Nd (λ=1064nm, E<1.2J, t~10ns) and Yb laser(λ=1030nm, E<10J, t~500fs) systems is possible to operate at 10 - 50Hz repetition rate. This double pulse laser system, with attainable laser intensity up to about 1017[W/cm²], was used to generate highly charged ions of solid target. First, the Nd laser creates a plasma plume. Next, the Yb laser reheats plasma plume by high intensity pulse at delay time of nanosecond. The properties of ions were investigated mainly on the base of time-of-flight method.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI009
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MOPRI037	Development of Iridium Cerium Photocathode for the Generation of High-Charge Electron Beam	679
SUSPSNE033	use link to see paper's listing under its alternate paper code
	D. Satoh TIT, Tokyo, Japan N. Hayashizaki RLNR, Tokyo, Japan T. Natsui, M. Yoshida KEK, Ibaraki, Japan
	We developed an iridium cerium cathode material made by new production method for multi-purpose electron source. For multi-purpose electron source, we focused on the Ir5Ce compound which has a high melting point (> 2100 K) and a low work function (2.57 eV). This material has some excellent properties as both a thermionic cathode and a photocathode. For example, Ir5Ce thermionic cathode can generate one-order higher electrical current than a LaB6 cathode at the same temperature. Another advantage is that an Ir5Ce thermionic cathode has a lifetime two orders longer than that of a LaB6 thermionic cathode under the same conditions. Moreover, we discovered that this material has a reasonably high quantum efficiency (2.70 × 10−3 @213nm at 1000°C) and long-lifetime (> LaB6) as a photocathode. Our research shows that Ir5Ce compound is optimum material for a thermionic cathode and photocathode. We focused on this good emission properties under the high temperature and we tried to develop a backside electron beam heating system and demonstrate a laser pre-pulse heating for a high current thermionic gun system or high charge photocathode gun.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI037
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THPME025	Low Power Test of a Hybrid Single Cavity Linac	3274
	L. Lu, Y. He, Q. Jin, C.X. Li, G. Pan, A. Shi, L.B. Shi, L.T. Sun, L.P. Sun, Z.L. Zhang, H.W. Zhao, H. Zhao IMP, Lanzhou, People's Republic of China T. Hattori NIRS, Chiba-shi, Japan N. Hayashizaki RLNR, Tokyo, Japan
	We fabricated and assembled a hybrid single cavity (HSC) linac which is formed by combining a radio frequency quadrupole (RFQ) structure and a drift tube (DT) structure into one interdigital-H (IH) cavity. ]. The HSC linac was designed as an injector for a cancer facility and was able to be used as a neutron source for boron neutron capture therapy. The injection method of the HSC linac used a direct plasma injection scheme (DPIS), which is considered to be the only method for accelerating a high current heavy ion beam produced by a laser ion source. The input beam current was designed to be 20 mA, which could be produced by a laser ion source. According to the simulations and calculations, the HSC linac could accelerate a 6-mA C⁶⁺, beam which satisfies the particle number criteria for cancer therapy use (10⁸~9 ions/pulse). Details of the measurements and evaluations of the assembled HSC linac, and details of a DPIS test using a laser ion source are reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME025
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Paper

Title

Page

MOPRI009

Study on New Method for Generating Highly Charged Ions with Double Pulse Laser Ion Source

595

SUSPSNE029

use link to see paper's listing under its alternate paper code

T. Shibuya
TIT, Tokyo, Japan
N. Hayashizaki
RLNR, Tokyo, Japan
M. Yoshida
KEK, Ibaraki, Japan

Laser ion source capable of generating high intensity ions is best for the ion source of RI beam facilities. A great deal of effort has been made on particle number as DPIS. Only few attempts have so far been made at generating highly charged ions. One of previous research has reported that Au+53 ions are produced by PALS laser. "Nonlinear process" mechanisms such as resonance absorption and self-focusing were used for this. However, these methods have limitation due to low repetition rate of the laser. Nd (λ=1064nm, E<1.2J, t~10ns) and Yb laser(λ=1030nm, E<10J, t~500fs) systems is possible to operate at 10 - 50Hz repetition rate. This double pulse laser system, with attainable laser intensity up to about 1017[W/cm²], was used to generate highly charged ions of solid target. First, the Nd laser creates a plasma plume. Next, the Yb laser reheats plasma plume by high intensity pulse at delay time of nanosecond. The properties of ions were investigated mainly on the base of time-of-flight method.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI009

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRI037

Development of Iridium Cerium Photocathode for the Generation of High-Charge Electron Beam

679

SUSPSNE033

use link to see paper's listing under its alternate paper code

D. Satoh
TIT, Tokyo, Japan
N. Hayashizaki
RLNR, Tokyo, Japan
T. Natsui, M. Yoshida
KEK, Ibaraki, Japan

We developed an iridium cerium cathode material made by new production method for multi-purpose electron source. For multi-purpose electron source, we focused on the Ir5Ce compound which has a high melting point (> 2100 K) and a low work function (2.57 eV). This material has some excellent properties as both a thermionic cathode and a photocathode. For example, Ir5Ce thermionic cathode can generate one-order higher electrical current than a LaB6 cathode at the same temperature. Another advantage is that an Ir5Ce thermionic cathode has a lifetime two orders longer than that of a LaB6 thermionic cathode under the same conditions. Moreover, we discovered that this material has a reasonably high quantum efficiency (2.70 × 10−3 @213nm at 1000°C) and long-lifetime (> LaB6) as a photocathode. Our research shows that Ir5Ce compound is optimum material for a thermionic cathode and photocathode. We focused on this good emission properties under the high temperature and we tried to develop a backside electron beam heating system and demonstrate a laser pre-pulse heating for a high current thermionic gun system or high charge photocathode gun.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI037

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPME025

Low Power Test of a Hybrid Single Cavity Linac

3274

L. Lu, Y. He, Q. Jin, C.X. Li, G. Pan, A. Shi, L.B. Shi, L.T. Sun, L.P. Sun, Z.L. Zhang, H.W. Zhao, H. Zhao
IMP, Lanzhou, People's Republic of China
T. Hattori
NIRS, Chiba-shi, Japan
N. Hayashizaki
RLNR, Tokyo, Japan

We fabricated and assembled a hybrid single cavity (HSC) linac which is formed by combining a radio frequency quadrupole (RFQ) structure and a drift tube (DT) structure into one interdigital-H (IH) cavity. ]. The HSC linac was designed as an injector for a cancer facility and was able to be used as a neutron source for boron neutron capture therapy. The injection method of the HSC linac used a direct plasma injection scheme (DPIS), which is considered to be the only method for accelerating a high current heavy ion beam produced by a laser ion source. The input beam current was designed to be 20 mA, which could be produced by a laser ion source. According to the simulations and calculations, the HSC linac could accelerate a 6-mA C⁶⁺, beam which satisfies the particle number criteria for cancer therapy use (10⁸~9 ions/pulse). Details of the measurements and evaluations of the assembled HSC linac, and details of a DPIS test using a laser ion source are reported in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME025

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)