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361 results on '"Biri, S."'

113. Development of Electron Cyclotron Resonance Ion Source for Synthesis of Endohedral Metallofullerenes

Author

Tanaka, K., primary, Muramatsu, M., additional, Uchida, T., additional, Biri, S., additional, Asaji, T., additional, Shima, K., additional, Hanajiri, T., additional, Kitagawa, A., additional, Kato, Y., additional, Yoshida, Y., additional, Seebauer, Edmund G., additional, Felch, Susan B., additional, Jain, Amitabh, additional, and Kondratenko, Yevgeniy V., additional

Published
2008
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114. Conclusions from recent pionic—atom experiments

Author

Gotta, D., primary, Amaro, F., additional, Anagnostopoulos, D. F., additional, Biri, S., additional, Covita, D. S., additional, Gorke, H., additional, Gruber, A., additional, Hennebach, M., additional, Hirtl, A., additional, Ishiwatari, T., additional, Indelicato, P., additional, Jensen, Th., additional, Le Bigot, E.-O., additional, Marton, J., additional, Nekipelov, M., additional, dos Santos, J. M. F., additional, Schlesser, S., additional, Schmid, Ph., additional, Simons, L. M., additional, Strauch, Th., additional, Trassinelli, M., additional, Veloso, J. F. C. A., additional, Zmeskal, J., additional, Kanai, Yasuyuki, additional, and Yamazaki, Yasunori, additional

Published
2008
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120. Imaging of ECR plasmas with a pinhole x-ray camera

Author

Biri, S., primary, Valek, A., additional, Suta, T., additional, Takács, E., additional, Szabó, Cs., additional, Hudson, L. T., additional, Radics, B., additional, Imrek, J., additional, Juhász, B., additional, and Pálinkás, J., additional

Published
2004
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121. Electron cyclotron resonance ion source developments at Louvain-la-Neuve

Author

UCL - Autre, Barue, C, Biri, S., Cherkani-Hassani, S., Gaelens, M., Loiselet, Marc, Ryckewaert, Guido, 7th International Conference on Ion Sources (ICIS 97), UCL - Autre, Barue, C, Biri, S., Cherkani-Hassani, S., Gaelens, M., Loiselet, Marc, Ryckewaert, Guido, and 7th International Conference on Ion Sources (ICIS 97)

Abstract

A new 6 GHz electron cyclotron resonance (ECR) ion source has been developed and installed at Louvain-la-Neuve. It replaces the previous ECR ion source OCTOPUS and routinely produces highly charged ion beams from gaseous elements with a better intensity and stability. The magnetic configuration of the ion source and results obtained for the production of gaseous (O,Ar,Xe) and metallic (Ni) ions are presented. The possibility to use the sputtering method to ionize radioactive elements has been tested on F-18(T-1/2 = 110 min). Ionization efficiency measurements for F-18(1+) are reported. (C) 1998 American Institute of Physics.

Published
1998

122. Measurement of the Strong Interaction Shift and Width of the Ground State of Pionic Hydrogen

Author

Manil, B., primary, Anagnostopoulos, D. F., additional, Biri, S., additional, Borchert, G. L., additional, Breunlich, W., additional, Egger, J. P., additional, Gotta, D., additional, Gruber, A., additional, Hennebach, M., additional, Indelicato, P., additional, Jensen, T., additional, Liu, Y. W., additional, Markushin, V., additional, Nelms, N., additional, Simons, L. M., additional, and Zmeskal, H., additional

Published
2003
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127. High Resolution He-like Argon And Sulfur Spectra From The PSI ECRIT.

Author

Trassinelli, M., Biri, S., Boucard, S., Covita, D. S., Gotta, D., Leoni, B., Hirtl, A., Indelicato, P., Le Bigot, E.-O., dos Santos, J. M. F., Simons, L. M., Stingelin, L., Veloso, J. F. C. A., Wasser, A., and Zmeskal, J.

Subjects
*SPECTRUM analysis, *ELECTRIC equipment, *PHYSICS instruments, *OPTICS, *X-ray spectroscopy, *RESONANCE
Abstract

We present new results on the X-ray spectroscopy of multicharged argon, sulfur and chlorine obtained with the Electron Cyclotron Resonance Ion Trap (ECRIT) in operation at the Paul Scherrer Institut (Villigen, Switzerland). We used a Johann-type Bragg spectrometer with a spherically-bent crystal, with an energy resolution of about 0.4 eV. The ECRIT itself is of a hybrid type, with a superconducting split coil magnet, special iron inserts which provides the mirror field, and a permanent magnetic hexapole. The high frequency was provided by a 6.4 GHz microwave emitter. We obtained high intensity X-ray spectra of multicharged F-like to He-like argon, sulfur and chlorine with one 1s hole. In particular, we observed the 1s2s 3S1 → 1s2 1S0 M1 and 1s2p 3P2 → 1s2 1S0 M2 transitions in He-like argon, sulfur and chlorine with unprecedented statistics and resolution. The energies of the observed lines are being determined with good accuracy using the He-like M1 line as a reference. We surveyed the He-like M1 transition intensity as a function of the ECRIT working conditions. In particular we observed the M1 intensity dependency on the coil current and on the injected microwave power. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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132. Experiments with biased side electrodes in electron cyclotron resonance ion sources.

Author

Drentje, A. G., Kitagawa, A., Uchida, T., Rácz, R., and Biri, S.

Subjects
ELECTRON cyclotron resonance sources, ION sources, NUCLEAR physics instruments, ELECTRODES, IONS, ELECTRONS
Abstract

The output of highly charged ions from an electron cyclotron resonance ion source (ECRIS) consists of ionic losses from a highly confined plasma. Therefore, an increase of the output of the ions of interest always is a compromise between an increase in the confinement and an increase of the losses. One route towards a solution consists of attacking the losses in directions -- i.e., radial directions -- that do not contribute to the required output. This was demonstrated in an experiment (using the Kei ECRIS at NIRS, Japan) where radial losses were electrostatically reduced by positively biasing one set of six "side" electrodes surrounding the plasma in side-ward directions attached (insulated) to the cylindrical wall of the plasma chamber. Recently new studies were performed in two laboratories using two essentially different ion sources. At the BioNano ECRIS (Toyo University, Japan) various sets of electrodes were used; each of the electrodes could be biased individually. At the Atomki ECRIS (Hungary), one movable, off-axis side electrode was applied in technically two versions. The measurements show indeed a decrease of ionic losses but different effectivities as compared to the biased disk. [ABSTRACT FROM AUTHOR]

Published
2014
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147. Fullerenes in electron cyclotron resonance ion sources.

Author

Biri, S., Fekete, É., Kitagawa, A., Muramatsu, M., Jánossy, A., and Pálinkás, J.

Subjects
*ELECTRON cyclotron resonance sources, *ION sources, *IONS, *MULTIPLY charged ions, *INDUSTRIAL applications of electron beams, *SOLENOID magnetic fields, *FULLERENES, *PLASMA electrodynamics, *QUANTUM electrodynamics
Abstract

Fullerene plasmas and beams have been produced in our electron cyclotron resonance ion sources (ECRIS) originally designed for other purposes. The ATOMKI-ECRIS is a traditional ion source with solenoid mirror coils to generate highly charged ions. The variable frequencies NIRS-KEI-1 and NIRS-KEI-2 are ECR ion sources built from permanent magnets and specialized for the production of carbon beams. The paper summarizes the experiments and results obtained by these facilities with fullerenes. Continuous effort has been made to get the highest C60 beam intensities. Surprisingly, the best result was obtained by moving the C60 oven deep inside the plasma chamber, very close to the resonance zone. Record intensity singly and doubly charged fullerene beams were obtained (600 and 1600 nA, respectively) at lower C60 material consumption. Fullerene derivatives were also produced. We mixed fullerenes with other plasmas (N, Fe) with the aim of making new materials. Nitrogen encapsulated fullerenes (mass: 720+14=734) were successfully produced. In the case of iron, two methods (ferrocene, oven) were tested. Molecules with mass of 720+56=776 were detected in the extracted beam spectra. [ABSTRACT FROM AUTHOR]

Published
2006
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148. Status report on ECR ion sources at HIMAC.

Author

Kitagawa, A., Muramatsu, M., Sasaki, M., Yamada, S., Sakuma, T., Sasaki, N., Takahashi, H., Takasugi, W., Yamamoto, M., Biri, S., Sudlitz, K., and Drentje, A. G.

Subjects
HEAVY ion accelerators, CANCER treatment, RADIOTHERAPY, ION sources, ION bombardment, CANCER radiotherapy
Abstract

The Heavy Ion Medical Accelerator in Chiba (HIMAC) at the National Institute of Radiological Sciences (NIRS) is the first heavy-ion accelerator complex dedicated to cancer therapy. Over 1600 patients have already been treated with 140–400 MeV/amu carbon beams since 1994. The production of carbon ions for medical applications has been established. It is quite obvious from our experiences that the ECR ion source is an extremely suitable type of ion source for this purpose. An 18 GHz ECR ion source is mainly operated to offer various heavy-ion beams for basic experiments of biomedical science, physics, chemistry, etc. The results of recent developments, a thermal-controlled MIVOC system, and an electron bombardment evaporator are also reported. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2004
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149. Compact ECR ion source with permanent magnets for carbon therapy.

Author

Muramatsu, M., Kitagawa, A., Sakamoto, Y., Sato, Y., Yamada, S., Ogawa, H., Drentje, A. G., Biri, S., and Yoshida, Y.

Subjects
ION sources, IONS, NUCLEAR physics instruments, ELECTRON cyclotron resonance sources, PERMANENT magnets, MAGNETS, NUCLEAR physics, PHYSICS
Abstract

Ion sources for the medical facilities should have the following characteristics of easy maintenance, low electric power, good stability, and long operation time without trouble (1 year or longer). For this, a 10 GHz compact electron cyclotron resonance ion source (ECRIS) with all permanent magnets was developed. The beam intensity and stability for C4+ were 280 e μA and better than 6% during 20 h with no adjustment of any source parameters. These results were acceptable for the medical requirements. Recently, many plans were proposed to construct the next generation cancer treatment facility. For such a facility we have designed an all permanent magnet ECRIS, in which a high magnetic field is chosen for increasing the beam intensity. The maximum mirror magnetic fields on the beam axis are 0.59 T at the extraction side and 0.87 T at the gas injection side, while the minimum B strength is 0.25 T. The source has a diameter of 32 cm and a length of 29.5 cm. Details of the design of this source and its background are described in this article. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2004
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150. Diagnostic research of plasmas generated by a 14.5 GHz ECR ion source using Langmuir-probe.

Author

Kene´z, L., Biri, S., Kara´csony, J., Valek, A., Nakagawa, T., Stiebing, K. E., and Mironov, V.

Subjects
*ELECTRON cyclotron resonance sources, *PLASMA gases
Abstract

Electron cyclotron resonance (ECR) plasmas have already been studied in many ways, mainly by x-ray and UV measurements. Langmuir-probes, however, have proven useful for other kind of plasmas, and have rarely been used to explore the ECR plasma. A diagnostics setup has been built at the 14.5 GHz ATOMKI-ECRIS. Results of the cold plasma region measurements are shown. A modified version of the original methods for characteristics analysis is reported. This includes the complex nature of the plasma ion component. Calculated electron densities yielded by the two compared theoretical models up to a factor of 3 were observed. This obviously shows the necessary consideration of this effect. Studies of two-faced external effects, e.g., biased-disk on/off, beam extraction on/off, have also started; first results are reported. [ABSTRACT FROM AUTHOR]

Published
2002

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