Energy-varying beam extraction assisted by large momentum deviation and charge exchange

Takayama, Ken; Kawakubo, T.; Adachi, Toshikazu; Dixit, Tanuja; Shaikh, Aqsa

doi:10.1103/physrevaccelbeams.24.011601

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…C 4+ ions are accelerated to several MeV/u by a linear accelerator (injector), converted to C 6+ by a carbon thin film stripper, and injected into a high-frequency (RF) synchrotron. Takayama et al recently proposed a new cancer therapy system based on induction synchrotron technology [1,2]. Since the induction synchrotron can cover a much wider circulation frequency than the RF synchrotron, relatively low-energy carbon ions (~100 keV/u) can be injected directly from the ion source.…”

Section: Introductionmentioning

confidence: 99%

A Long-life Laser Ion Source Using a Reproducible Solidified Gas Target

Hasegawa,

Inoue,

Matsubara

et al. 2024

J. Phys.: Conf. Ser.

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A novel laser ion source using a reproducible cryogenic target has been developed for next-generation heavy-ion cancer therapy accelerators. A solid thin layer of butane formed on a cylindrical cold head cooled with liquid nitrogen is ablated by a frequency-doubled Nd:YAG laser to generate high-charged carbon ions. The properties and reproducibility of the carbon plasmas produced under various conditions are investigated.

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Section: Introductionmentioning

confidence: 99%

A Long-life Laser Ion Source Using a Reproducible Solidified Gas Target

Hasegawa,

Inoue,

Matsubara

et al. 2024

J. Phys.: Conf. Ser.

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Evolution of induction synchrotrons

Takayama

2023

Reviews in Physics

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Fourth generation switching power supply for circular induction accelerators

Liu

Okamura

Takayama

2023

Review of Scientific Instruments

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A switching power supply (SPS) was applied as the high-frequency bipolar high-voltage pulse source required to accelerate charged particles in the induction synchrotron, which was a novel synchrotron proposed at the High Energy Accelerator Research Organization (KEK) in 2006, and it was also used in other circular induction accelerators proposed thereafter, including the induction sector cyclotron and the induction microtron. As the heart of the circular induction accelerator, the SPS has recently been developed up to a fourth generation system that uses newly developed 3.3 kV high-speed SiC metal–oxide–semiconductor field-effect transistors(MOSFETs). The updates involved in this new SPS include the use of two parallel MOSFETs in each arm to shunt heat dissipation at high frequencies, optimization of the bus pattern, with low parasitic capacitance among the arms to improve the drain–source voltage (VDS) balance, and addition of current sampling circuits to provide an economical method to monitor the operating status in large-scale application scenarios. The heat power and temperature characteristics of the MOSFETs were studied specifically in both individual tests and SPS tests. To date, the new SPS has achieved 2.5 kV-17.4 A bipolar output at 350 kHz in continuous mode operation. The highest junction temperature of the MOSFETs was estimated to be 98 °C.

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Energy-varying beam extraction assisted by large momentum deviation and charge exchange

Cited by 3 publications

References 6 publications

A Long-life Laser Ion Source Using a Reproducible Solidified Gas Target

A Long-life Laser Ion Source Using a Reproducible Solidified Gas Target

Evolution of induction synchrotrons

Fourth generation switching power supply for circular induction accelerators

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