Improvement in beam quality of the JAEA AVF cyclotron for focusing heavy-ion beams with energies of hundreds of MeV

Kurashima, Satoshi; Miyawaki, Nobumasa; Okumura, Susumu; Oikawa, Masakazu; Yoshida, Kazuo; Kamiya, Tomihiro; Fukuda, Mitsuhiro; Satoh, Takahiro; Nara, T.; Agematsu, Takashi; Ishibori, I.; Yokota, W.; Nakamura, Y.

doi:10.1016/j.nimb.2007.01.278

Cited by 15 publications

(3 citation statements)

References 10 publications

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“…4,20) Up to few years ago single-ion experiments have been performed mainly by collimating ion beams by small aperture of micrometer dimensions. Currently in Europe the mechanical collimation is used at INFN-LNL and CEA-LPS facilities.…”

Section: Microbeam Formationmentioning

confidence: 99%

Ionizing Radiation Microbeam Facilities for Radiobiological Studies in Europe

Gerardi¹

2009

JRR

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A growing body of experimental evidence gathered in the last 10-15 years with regard to targeted and non-targeted effects of low doses of ionizing radiation (hyper-radiosensitivity, induced radio-resistance, adaptive response, genomic instability, bystander effects) has pushed the radiobiology research towards a better understanding of the mechanisms underlying these phenomena, the extent to which they are active in-vivo, and how they are inter-related. In such a way factors could be obtained and included in the estimation of potential cancer risk to the human population of exposure to low levels of ionizing radiation. Different experimental approaches have been developed and employed to study such effects in-vitro (medium transfer experiments; broad-field irradiation at low doses also with insert or shielding systems...). In this regard, important contributions came from ionizing radiation microbeam facilities that turn to be powerful tools to perform selective irradiations of individual cells inside a population with an exact, defined and reproducible dose (i.e. number of particles, in case of charged particle microbeams). Over the last 20 years the use of microbeams for radiobiological applications increased substantially and a continuously growing number of such facilities, providing X-rays, electrons, light and heavy ions, has been developing all over the world. Nowadays, just in Europe there are 12 microbeam facilities fully-operational or under-development, out of more than 30 worldwide. An overview of the European microbeam facilities for radiobiological studies is presented and discussed in this paper.

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Section: Microbeam Formationmentioning

confidence: 99%

Ionizing Radiation Microbeam Facilities for Radiobiological Studies in Europe

Gerardi¹

2009

JRR

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“…Possible sources include the acceleration voltage drift ͑⌬V / V͒ and the magnetic field drift ͑⌬B / B͒, which were reduced to less than 0.02% and 1 ϫ 10 −5 , respectively, by temperature stabilization of the rf system and magnet yoke. 3,4 Possible causes of changes observed as beam intensity fluctuation that may be attributed to a couple of room-temperature ECRISs ͑Ref. 5͒ currently in use for the cyclotron are a change in magnetic field due to heat from coils and drift in coolant temperatures.…”

Section: Introductionmentioning

confidence: 99%

Stability study of all-permanent-magnet electron cyclotron resonance ion source

Yoshida

Nara

Saitoh

et al. 2010

Review of Scientific Instruments

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Beam intensity fluctuation was investigated using an electron cyclotron resonance ion source of an all-permanent-magnet type under development for highly stable beam intensity. While the source achieved a stability of better than 3.2% by strict regulation of the coolant temperature change within +/-0.1 degrees C, the intensity varies strongly with intentional changes in the temperature of the plasma chamber coolant. The influence of the temperature on chamber expansion, magnetic field strength, and vacuum was measured or estimated in detail. The result shows that a slight change in vacuum and magnetic field strength has considerable influence on the intensity fluctuation.

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“…The IEEM is a compact and relatively inexpensive alternative. The very best longstanding SEE microbeam facilities achieve routine lateral resolutions of 0.5-1 m [4]- [6]. Theoretically the intrinsic resolution of an IEEM is better than 1 m [3].…”

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confidence: 99%

Ion Impact Detection and Micromapping With a SDRAM for IEEM Diagnostics and Applications

Bertazzoni

Bisello²,

Giubilato³

et al. 2009

IEEE Trans. Nucl. Sci.

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Ion Electron Emission Microscopy (IEEM) can provide an alternative approach to microbeams for micrometric characterization of the sensitivity map to Single Event Effects (SEE) of an electronic device. In IEEM technique, a broad (not focused) ion beam is sent onto the Device Under Test (DUT). Secondary electrons emitted by the target surface during each ion impact are collected and focused by a system of electrostatic lenses and finally imaged by a high-rate and high-resolution position detector. We will report on the IEEM working at the SIRAD irradiation facility located at the 15 MV Tandem of INFN Legnaro National Laboratories. To estimate the IEEM resolution, a SDRAM is a good candidate to be used as a reference target, thanks to the micrometric feature size of the array of memory cells and the precise knowledge of their physical locations. Since an electronic device is not a good secondary electrons emitter, to ensure a copious and uniform emission of secondary electrons from the DUT, a very thin (100 nm) self-standing Silicon Nitride (Si 3 N 4 ) membrane with a Au deposition (40 nm) is mounted on the top of the SDRAM. The Au/Si 3 N 4 membrane and the underlying SDRAM are irradiated with a heavy ion beam. The physical map of ion impacts detected by the SDRAM is then compared with the one reconstructed by the IEEM in the same 500 ms time interval. Index Terms-Ion electron emission microscopy, radiation effects, SDRAM, single event upset (SEU).

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Improvement in beam quality of the JAEA AVF cyclotron for focusing heavy-ion beams with energies of hundreds of MeV

Cited by 15 publications

References 10 publications

Ionizing Radiation Microbeam Facilities for Radiobiological Studies in Europe

Ionizing Radiation Microbeam Facilities for Radiobiological Studies in Europe

Stability study of all-permanent-magnet electron cyclotron resonance ion source

Ion Impact Detection and Micromapping With a SDRAM for IEEM Diagnostics and Applications

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