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Journal Articles

Development of laser system for laser stripping injection

Harada, Hiroyuki; Saha, P. K.; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Sato, Atsushi*; Kinsho, Michikazu

JPS Conference Proceedings (Internet), 33, p.011026_1 - 011026_6, 2021/03

The charge-exchange multi-turn injection by using a carbon stripper foil is adopted in high-intensity proton ring accelerators worldwide. It is a beneficial method to compress the pulsed proton beam with high intensity but there are serious issues for high intensity. First issue is a short lifetime of the foil by deformation or breaking itself. Another issue is high radiation dose corresponding to the scattered particles on the foil. Therefore, a non-destructive stripping injection method is required for higher intensity proton beam. We newly propose a non-destructive method of H$$^{-}$$ stripping by using only laser. The new method is called "laser stripping injection". To establish our method, we are preparing for a POP (Proof-of-Principle) experiment of 400 MeV H- stripping to proton at J-PARC. In our presentation we will present the current status of laser system development for laser stripping injection at J-PARC.

Journal Articles

Studies of laser power reduction for the laser stripping of 400 MeV $$H^{-}$$ beam at J-PARC RCS

Saha, P. K.; Harada, Hiroyuki; Kinsho, Michikazu; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Sato, Atsushi*; Liu, Y.*

JPS Conference Proceedings (Internet), 33, p.011025_1 - 011025_7, 2021/03

Journal Articles

Status of laser development for laser stripping experiment at J-PARC

Harada, Hiroyuki; Saha, P. K.; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Sato, Atsushi*; Shibata, Takanori*; Kinsho, Michikazu

Proceedings of 17th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.441 - 445, 2020/09

The high-intensity proton accelerator adopts a charge exchange injection scheme, which injects with exchanging from negative Hydrogen ion to proton by using carbon foil. This scheme is destructive-type method by using the foil and can accumulate high intensity proton beam. However, the uncontrolled beam losses by scattering at the foil and the foil breaking by the beam collision are a key issue of high-intensity proton accelerator. In order to realize higher intensity, new injection scheme of non-destructive type is needed instead of the foil. We newly propose laser stripping injection scheme by using laser pulse. We plan proof of principle experiment at J-PARC and are developing the laser system. In my presentation, we introduce the overview of laser stripping injection scheme and report the status of laser development.

Journal Articles

Status of the proof-of-principle demonstration of 400 MeV H$$^{-}$$ laser stripping at J-PARC

Saha, P. K.; Harada, Hiroyuki; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Sato, Atsushi*; Shibata, Takanori*; Kinsho, Michikazu

Proceedings of 17th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.436 - 440, 2020/09

Oral presentation

A Proof-Of-Principle (POP) experiment for laser stripping injection

Harada, Hiroyuki; Saha, P. K.; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Sato, Atsushi*; Kinsho, Michikazu

no journal, , 

The high-intensity proton accelerator adopts a charge exchange injection scheme, which injects with exchanging from negative Hydrogen ion to proton by using carbon foil. This scheme can realize high intensity proton beam but the uncontrolled beam losses are caused by scattering between beams and the foil. Additionally, the collision may occur the foil beak. Therefore, a new injection scheme for higher intensity is needed as an alternative to the foil. In the J-PARC, we newly propose a laser stripping injection scheme by using a laser and develop the laser system for a test. In my presentation, we introduce an overview of laser stripping injection and report the status of the development.

Oral presentation

Status of a proof-of-principle experiment for realizing laser stripping injection at high-intensity proton accelerator

Harada, Hiroyuki; Saha, P. K.; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Sato, Atsushi*; Shibata, Takanori*; Kinsho, Michikazu

no journal, , 

The high-intensity proton accelerator adopts a charge exchange injection scheme, which injects with exchanging from negative Hydrogen ion to proton by using carbon foil. This scheme is destructive-type method by using the foil and can accumulate high intensity proton beam. However, the uncontrolled beam losses by scattering at the foil and the foil breaking by the beam collision are a key issue of high-intensity proton accelerator in the world. In the J-PARC, we newly propose a laser stripping injection scheme of nondestructive-type method as an alternative to the foil and are under development for a proof-of-principle experiment of the method. In my presentation, we introduce an overview of laser stripping injection. Additionally, we report the status of the development and the schedule of the experiment.

Oral presentation

Development of high repetitive laser pulse system for charge exchange process of hydrogen beam in J-PARC

Fuchi, Aoi*; Yoneda, Hitoki*; Michine, Yurina*; Harada, Hiroyuki; Saha, P. K.; Sato, Atsushi*; Shibata, Takanori*; Kinsho, Michikazu

no journal, , 

In the J-PARC as high-intensity proton accelerator, beam injection into a synchrotron uses for charge exchange process from hydrogen to proton. For higher intensity beam, we study laser development and POP experiment for charge exchange by using laser. In our method, we consider doppler shift and multi process of electron stripping. Therefore, we are developing high power laser and the 5th harmonics. In order to reduce laser power, we must increase the utilization rate of laser. So, we develop multi-pass cavity and beam shaper. In our presentation, we will report about a status of high-repetition laser and optics devices under developing.

Oral presentation

Status of laser stripping experiment in high-intensity proton accelerator

Harada, Hiroyuki; Saha, P. K.; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Shibata, Takanori*; Kinsho, Michikazu

no journal, , 

The high-intensity proton accelerator adopts a charge exchange injection scheme, which injects with exchanging from negative Hydrogen ion to proton by using carbon foil. This scheme is destructive-type method by using the foil and can accumulate high intensity proton beam. However, the uncontrolled beam losses by scattering at the foil and the foil breaking by the beam collision are a key issue of high-intensity proton accelerator in the world. In the J-PARC, we newly propose a laser stripping injection scheme of nondestructive-type method as an alternative to the foil and are under development for a proof-of-principle experiment of the method. In my presentation, we introduce an overview of laser stripping injection. Additionally, we report the status of the development and the results of the first experiment (day-1).

Oral presentation

Development of laser system for charge exchange negative hydrogen ion beam in high-intensity proton accelerator

Fuchi, Aoi*; Yoneda, Hitoki*; Michine, Yurina*; Harada, Hiroyuki; Saha, P. K.; Shibata, Takanori*; Kinsho, Michikazu

no journal, , 

In high-intensity proton accelerator, accelerated H- beams in linac are injected with charge exchange in the ring by using carbon foil. This scheme is destructive-type method by using the foil and can accumulate high intensity proton beam. However, the uncontrolled beam losses by scattering at the foil and the foil breaking by the beam collision are a key issue of high-intensity proton accelerator in the world. In the J-PARC, we newly propose a laser stripping injection scheme of nondestructive-type method as an alternative to the foil and are under development for a proof-of-principle experiment of the method. We developed laser system and optical cavity and started the first trial of the experiment. As this experimental result, we realized the charge exchange of 0.57% for final goal one of 99%. In our presentation, developed laser system and optics will be explained and we will report first results of the experiment.

Oral presentation

Development and calibration of Doppler shifted Balmer lines photometry system for 400 MeV $$H^0$$ atoms generated by laser $$H^-$$ stripping

Shibata, Takanori*; Harada, Hiroyuki; Saha, P. K.; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Kinsho, Michikazu

no journal, , 

In order to further increase the intensity of the proton beam at J-PARC, we are planning a laser charge conversion test to convert the proton beam to protons nondestructively instead of the current carbon film. In the laser charge conversion process, we are considering a scenario in which neutral hydrogen $$H^0$$ is passed through excited $$H^0*$$. For this experiment, it is necessary to understand the energy levels of $$H^0$$ and its excitation efficiency. In this study, we are developing a spectroscopic measurement system to spectroscopically detect the light emitted from the excited $$H^0$$. In this presentation, we will report on the development of the spectroscopic measurement system, which is important for laser charge conversion.

Oral presentation

Laser stripping experiment in J-PARC

Harada, Hiroyuki; Saha, P. K.; Yoshimoto, Masahiro; Kinsho, Michikazu; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Shibata, Takanori*

no journal, , 

In high-intensity proton accelerator, H$$^{-}$$ beams are injected with charge exchange into the ring by using a carbon foil. This scheme is destructive-type method and can accumulate high intensity proton beam. However, the uncontrolled beam losses by foil scattering and the foil breaking are a key issue in the world. In the J-PARC, we newly propose a laser stripping injection scheme of nondestructive-type method as an alternative to the foil and are under development for a proof-of-principle experiment of the method. We developed laser system and optical cavity and performed the second trial of the experiment. We were successfully matched laser pulse to ion beam one in time-space dimension. As this experimental result, we realized the charge exchange ratio of 16.8%, which is 30 times higher than first result of 0.57%. We present the experimental results with introducing the scheme.

Oral presentation

J-PARC charge exchange experiment with picosecond pulse train laser system

Fuchi, Aoi*; Harada, Hiroyuki; Yoneda, Hitoki*; Michine, Yurina*; Saha, P. K.; Yoshimoto, Masahiro; Kinsho, Michikazu; Shibata, Takanori*

no journal, , 

At the J-PARC, a non-destructive method of "laser charge exchange injection" has been proposed and is under development to replace the carbon foil. In addition, the development of a non-destructive beam profile monitor is also important to stabilize the beam operation. In this study, we developed a laser source and a multi-pass cavity for this purpose, and performed the second experiment. In the development of the laser source, the timing of each of the five laser amplifiers was staggered, and we succeeded in producing a laser with a flat pulse structure. In the development of the multi-pass cavity, we succeeded in focusing 16 pulses of laser simultaneously to the irradiation point. As a result, a charge exchange efficiency of 16.8%, 30 times higher than the previous efficiency of 0.57%, was achieved. In this presentation, we report the results of the laser source development and the multi-pass cavity development.

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