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Wyświetlanie 1-15 z 79
Tytuł:
The proton beam energy measurement by a time-of-flight method
Autorzy:
Kisieliński, M.
Wojtkowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/148266.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
beam diagnostics
cyclotron
ion beam
Opis:
A simple TOF equipment for cyclotron protons beam energy measurement was constructed. For short distance of 165 cm between capacitive pick-up probes, the accuracy of proton beam energy is below 1% for mean beam currents above 200 nA and within the energy range 20 30 MeV.
Źródło:
Nukleonika; 2007, 52, 1; 3-5
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a large beam facility
Autorzy:
Oh, B.
In, S.
Lee, K.
Jeong, S.
Seo, C.
Chang, D.
Powiązania:
https://bibliotekanauki.pl/articles/147420.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
beam facility
high power ion beam
o neutral beam
beam line component
cryosorption pump
Opis:
A large beam facility for the application of high power ion beams has been developed at the Korea Atomic Energy Research Institute (KAERI). The primary usage of this facility is to develop an 8 MW neutral beam heating system for a tokamak, but other applications using a large beam would also be possible in the near future. The facility is composed of a bucket ion source (120 kV, 65 A), related beam line components including a large vacuum chamber (3 m x 4 m x 5 m), power supplies for the ion source, control and DAS (Data Acquisition System), beam diagnostics system, and a water circulation system (2 MW) for cooling of the beam line components. The maximum beam parameters at present are a beam energy of 87 kV and a beam current of 17.5 A with a beam size of 13 x 45 cm2. A maximum pulse length of 10 s could be achieved with a 1 MW beam power. The beam power with a hydrogen ion will be increased up to 7.5 MW during 5 s.
Źródło:
Nukleonika; 2006, 51, 1; 37-42
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The photon beam characteristics of linear accelerator equipped with additional narrow beam collimator
Autorzy:
Wysocka, A.
Maciszewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/147557.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
collimator
linear accelerator
narrow beam
photon beam
Opis:
In this paper a laboratory set-up with an electron linac installed in this Institute, and an attached narrow-beam collimator for photon beam are presented. Characteristics of the circular photon beams of diameters ranging from 10 to 30 mm at the isocentre are reported. The specific quantities measured include: relative output factors, beam profiles (off axis factors), and a central axis attenuation of beams. Measurements of these parameters were performed in a water phantom using small cylindrical ionisation chambers.
Źródło:
Nukleonika; 2001, 46, 3; 91-93
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of the basic photon and electron dosimetry data for Neptun 10PC linear accelerators
Autorzy:
Shokrani, P.
Monadi, S.
Powiązania:
https://bibliotekanauki.pl/articles/147666.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dosimetry
photon beam
electron beam
linear electron accelerator
Opis:
. In recent years the similarity of dosimetric characteristics of modern linear accelerators with the same make, model and nominal energy, has become more common. The goal of this study was to quantitatively investigate the reproducibility of the basic photon and electron dosimetry data from Neptun 10PC accelerators across the institutions. In the current study, the photon and electron dosimetry data collected during acceptance and initial commissioning of six Neptun 10PC linear accelerators are analyzed. The dates of original installations of these six machines were evenly spread out over a 5 year period and the series of measurements were conducted during an average of 1-2 months after original installations. All units had identical energies and beam modifiers. For photon beams, the collected data include depth dose data, output factors and beam profile data in water. For electron beams, in addition to depth dose data and output factors, the effective source skin distance for 10 × 10 cm field size is also presented. For most beam parameters the variation (one standard deviation), was less than 1.0% (less than 2% for 2 parameters). A variation of this magnitude is expected to be observed during annual calibration of well-maintained accelerators. In conclusion, this study is presenting a consistent set of data for Neptun 10PC linear accelerators. This consistency implies that for this model, a standard data set of basic photon and electron dosimetry could be established, as a guide for future commissioning, beam modeling and quality assurance purposes.
Źródło:
Nukleonika; 2008, 53, 4; 181-185
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AIC-144 cyclotron: present status
Autorzy:
Budzanowski, A.
Taraszkiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/148650.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cyclotron
extraction system
HF generator
proton beam
deuteron beam
Opis:
The presented AIC-144 cyclotron was designed and constructed 20 years ago in the Institute of Nuclear Physics in Kraków (Poland). Later on it was modernized, after the decision of creating the Hadron Radiotherapy Centre in Kraków was taken by the government. At present, the cyclotron is capable to deliver beams of protons (with energy up to 60 MeV), deuterons (with energy up to 30 MeV) and a-particles (with energy up to 60 MeV). The magnetic structure and the RF system were modernized (a new HF generator with output power 120 kW and frequency range 10-27 MHz was installed; an RF cavity resonator was reconstructed to improve the Q-factor at the highest frequencies). The new PIG source and system of central diaphragms was built to improve beams quality on the first turns. The single lamella and multilamella probes were fully reconstructed. Special effort was put on a highly efficient extraction system. The precession method for particles extraction was chosen as the best one. All computer simulations and experimental runs were done in close cooperation with specialists from the Laboratory of Nuclear Problems JINR, Dubna. The extraction system consists of 2 electrostatic deflectors, 3 magnetic channels (passive) and 4 coils for shaping of the 1st harmonic. So far, the beam extraction experiments were carried out for the proton beams with the final energy of 35 MeV, 48 MeV and 60 MeV. For all these energies the efficiency of extraction was above 50%. A computer remote control of the main magnet power supply and of the 24 correction coils was installed and put into operation. In the last 3 years, the internal beams of protons and a-particles were used to produce radioisotopes like 11C, 57Co, 83-85Sr, 102Rh, 111In, 173-175Hf, 178-181W.
Źródło:
Nukleonika; 2003, 48,suppl.2; 117-121
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accelerators in materials research
Autorzy:
Turos, A.
Powiązania:
https://bibliotekanauki.pl/articles/147928.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
materials research
accelerators
ion beam modification
ion beam analysis
Opis:
Abstract Since at least forty years accelerators of charged particles no longer belong to nuclear physics exclusively. This is especially true for accelerators at energies below 1 GeV. The vast majority of accelerators in this energy range is used for materials research and medicine. In materials research the applications are principally twofold: modifications of solids and surface layer microanalysis. Two most important challenges for materials research at the beginning of XXI century as determined by the Materials Research Society are: development of materials able to repair human body and development of materials for new electronic devices able to cope with the enormous amount of information to be stored and transmitted. The role of accelerators with regard to the challenges of modern technology will be discussed.
Źródło:
Nukleonika; 2005, 50,suppl.3; 11-15
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy composition of high-energy neutral beams on the COMPASS tokamak
Autorzy:
Mitosinkova, A.
Stöckel, J.
Varju, J.
Weinzettl, V.
Powiązania:
https://bibliotekanauki.pl/articles/147959.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
tokamak
neutral beam injection (NBI)
Doppler effect
beam composition
beamlet divergence
Opis:
The COMPASS tokamak is equipped with two identical neutral beam injectors (NBI) for additional plasma heating. They provide a beam of deuterium atoms with a power of up to ~(2 × 300) kW. We show that the neutral beam is not monoenergetic but contains several energy components. An accurate knowledge of the neutral beam power in each individual energy component is essential for a detailed description of the beam- -plasma interaction and better understanding of the NBI heating processes in the COMPASS tokamak. This paper describes the determination of individual energy components in the neutral beam from intensities of the Doppler-shifted Dα lines, which are measured by a high-resolution spectrometer viewing the neutral beam-line at the exit of NBI. Furthermore, the divergence of beamlets escaping single aperture of the last accelerating grid is deduced from the width of the Doppler-shifted lines. Recently, one of the NBI systems was modifi ed by the removal of the Faraday copper shield from the ion source. The comparison of the beam composition and the beamlet divergence before and after this modifi cation is also presented.
Źródło:
Nukleonika; 2016, 61, 4; 419-423
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slow positron beam at the JINR, Dubna
Autorzy:
Horodek, P.
Kobets, A. G.
Meshkov, I. N.
Sidorin, A. A.
Orlov, O. S.
Powiązania:
https://bibliotekanauki.pl/articles/147134.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
positron beam
positron injector
Opis:
The Low Energy Positron Toroidal Accumulator (LEPTA) at the Joint Institute for Nuclear Research (JINR) proposed for generation of positronium in flight has been adopted for positron annihilation spectroscopy (PAS). The positron injector generates continuous slow positron beam with positron energy range between 50 eV and 35 keV. The radioactive 22Na isotope is used. In distinction to popular tungsten foil, here the solid neon is used as moderator. It allows to obtain the beam intensity of about 105 e+/s width energy spectrum characterized by full width at half maximum (FWHM) of 3.4 eV and a tail to lower energies of about 30 eV. The paper covers the characteristic of variable energy positron beam at the LEPTA facility: parameters, the rule of moderation, scheme of injector, and transportation of positrons into the sample chamber. Recent status of the project and its development in the field of PAS is discussed. As an example, the measurement of the positron diffusion length in pure iron is demonstrated.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 725-728
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation processing of polymers and semiconductors at the Institute of Nuclear Chemistry and Technology
Autorzy:
Zimek, Z.
Przybytniak, G.
Kałuska, I.
Powiązania:
https://bibliotekanauki.pl/articles/146107.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron beam accelerators
radiation processing
Opis:
R&D studies in the field of radiation technology in Poland are mostly concentrated at the Institute of Nuclear Chemistry and Technology (INCT). The results of the INCT works on polymer and semiconductor modification have been implemented in various branches of national economy, particularly in industry and medicine. Radiation technology for polymer modification was implemented in the middle of the 1970-ties. Among others, the processes of irradiation and heat shrinkable products expansion have been developed. The transfer of this technology to Polish industry was performed in the middle of the 1980-ties. The present study aims at the formulation of new PE composites better suited to new generation of heat shrinkable products, for example, a new generation of hot-melt adhesives has been developed to meet specific requirements of customers. Modified polypropylene was used for the production of medical devices sterilized by radiation, especially disposable syringes, to overcome the low radiation resistance of the basic material. Modified polypropylene (PP-M) has been formulated at the INCT to provide material suitable for medical application and radiation sterilization process. Modification of semiconductor devices by EB was applied on an industrial scale since 1978 when the INCT and the LAMINA semiconductor factory successfully adopted that technology to improve specific semiconductor devices. This activity is continued on commercial basis where the INCT facilities served to contract irradiation of certain semiconductor devices according to the manufacturing program of the Polish factory and customers from abroad.
Źródło:
Nukleonika; 2006, 51,suppl.1; 129-132
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Status of ISL
Autorzy:
Homeyer, H.
Powiązania:
https://bibliotekanauki.pl/articles/146213.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
accelerator operations
ion beam technologies
Opis:
The Ion Beam Laboratory (ISL), operated by the Hahn-Meitner-Institut, Berlin, is exclusively dedicated to ion beam applications-technologies in materials science and medicine. ISL provides beams of light and heavy ions from various accelerators, and combinations of accelerators, with energies ranging from 10 eV to several 100 MeV. It operates various permanently installed target areas equipped with specific instruments for the different ion beam applications and fundamental ion solid state interaction research.
Źródło:
Nukleonika; 2003, 48,suppl.2; 127-130
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of stainless steel exposed to sandblasting
Autorzy:
Horodek, P.
Eseev, M. K.
Kobets, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/147075.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
stainless steel
sandblasting
defects
positron beam
Opis:
The influence of sandblasting on surface and subsurface of stainless steel is investigated using variable energy positron beam (VEP), positron annihilation spectroscopy (PAS), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Samples of stainless steel were blasted using 110 μm particles of Al2O3 under different pressure and time duration. In the case of sandblasting for 90 s, the reduction of positron diffusion length depending on the applied pressure was observed. Sandblasting during 30 s leads only to the reduction of positron diffusion length to about 60 nm for all samples. Positron lifetimes close to 170 ps measured using positrons emitted directly from the source point to the presence of vacancies on the dislocation lines. SEM and AFM images show that surface roughness depends rather on pressure of sandblasting than time of exposition.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 721-724
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of scintillator response to 60 MeV protons in a proton beam imaging system
Autorzy:
Rydygier, M.
Mierzwińska, G.
Czaderna, A.
Swakoń, J.
Waligórski, M. P. R.
Powiązania:
https://bibliotekanauki.pl/articles/146249.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
beam imaging
CCD camera
scintillation detector
Opis:
A Proton Beam Imaging System (ProBImS) is under development at the Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN). The ProBImS will be used to optimize beam delivery at IFJ PAN proton therapy facilities, delivering two-dimensional distributions of beam profiles. The system consists of a scintillator, optical tract and a sensitive CCD camera which digitally records the light emitted from the proton-irradiated scintillator. The optical system, imaging data transfer and control software have already been developed. Here, we report preliminary results of an evaluation of the DuPont Hi-speed thick back screen EJ 000128 scintillator to determine its applicability in our imaging system. In order to optimize the light conversion with respect to the dose locally deposited by the proton beam in the scintillation detector, we have studied the response of the DuPont scintillator in terms of linearity of dose response, uniformity of light emission and decay rate of background light after deposition of a high dose in the scintillator. We found a linear dependence of scintillator light output vs. beam intensity by showing the intensity of the recorded images to be proportional to the dose deposited in the scintillator volume.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 683-687
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical study of dose and dose rate effect on trichloroethylene (HClC=CCl2) decomposition in dry and humid air under electron beam irradiation
Autorzy:
Nichipor, H.
Yacko, S.
Sun, Y.
Chmielewski, A. G.
Zimek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/146819.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
trichloroethylene
electron beam decomposition
computer simulation
Opis:
Experimental data related to C2HCl3 (TCE) removal in dry and humid (200-1000 ppm of H2O) air, respectively, in ambient conditions under electron beam irradiation in the dose range of 1-40 kGy has been published in the literature. Based on the experimental results a theoretical model of C2HCl3 decomposition was proposed for the kinetic mechanism of such process. The active radicals of Cl, O and OH play an important role in the decomposition of TCE. According to the calculations performed, the Cl- dissociative electron attachment predominates in the initial stage of C2HCl3 decomposition. Cl radical accelerates this degradation by chain process in both humid and dry air, respectively. The OH radical produced in humid air also enhances the decomposition process of TCE.
Źródło:
Nukleonika; 2008, 53, 1; 11-16
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decomposition of toluene in air mixtures under electron beam irradiation
Autorzy:
Sun, Y.
Chmielewski, A. G.
Bułka, S.
Zimek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/148028.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
toluene
4-chlorotoluene
decomposition
electron beam
Opis:
The model gases of toluene-air mixtures were prepared by blowing technical air into liquid toluene and then irradiated with an ILU-6 accelerator located at the Institute of Nuclear Chemistry and Technology (INCT), Poland. It was found that the decomposition efficiency of toluene increases with absorbed dose and decreases with initial concentration of toluene. At 14.5 kGy dose, the decomposition efficiencies of toluene were 50, 37 and 34.5% for the initial concentrations of toluene 32.0, 63.4 and 78.0 ppm, respectively. At 58.0 kGy dose, the decomposition efficiencies of toluene were 93.8 and 78.1%, the initial concentrations of toluene being 32.0 and 63.4 ppm, respectively. Benzaldehyde was identified as one of the by-products of toluene decomposition in an air mixture. The decomposition efficiency and by-product formation under EB irradiation were compared between toluene and 4-chlorotoluene.
Źródło:
Nukleonika; 2009, 54, 2; 65-70
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On possible formulation of problems of a Dense Plasma Focus used in material sciences
Autorzy:
Gribkov, V.
Powiązania:
https://bibliotekanauki.pl/articles/146787.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cumulative plasma streams
dense plasma focus (DPF)
electron beam
ion beam
material sciences
neutrons
X-rays
Opis:
The paper describes various possibilities at can be given by the use of dense plasma focus (DPF) device in material sciences. Main distinguishing features of such a device – availability of several different types of hard radiation and its high power flux density – determine the niche of applications of this type devices in the field. Some directions of materials investigation and treatment, which can be developed at present time, are discussed.
Źródło:
Nukleonika; 2000, 45, 3; 149-153
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 79

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