11,856 research outputs found
Contribution IFJ PAN to the construction of the WENDELSTEIN 7-X stellarator (2008-2009)
No full textThe Wendelstein 7-X stellarator is now being assembled at the Max Planck Institute for Plasma Physic (IPP), Greifswald, Germany. The Agreement on Cooperation between the Max-Planck-Institut fur Plasmaphysik in Garching and the Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences in Krakow (IFJ PAN) was signed off in 2007. The intention of the agreement is to cover the whole period of the W7-X construction. According to the agreement IFJ PAN has taken over the following tasks:
1. to assembly of the bus bar system powering the superconducting coils of the stellarator;
2. to take part in design of equipment used during handling, transportation and assembly of outer vessels;
3. to manufacture 30 polichromators used for plasma diagnostics.
Task No 2 was completed in 2008 while tasks No 1 and 3 are to be continued
Contribution of IFJ PAN to the construction of the WENDELSTEIN 7-X stellarator (continuation 2010-2012)
No full textThe Wendelstein 7-X stellarator is now being assembled at the Max Planck Institute for Plasma Physic (IPP), Greifswald, Germany (branch of MP IPP Garching). The Agreement on Cooperation between the MP IPP and the Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences in Krakow (IFJ PAN) was signed in 2007. Within that agreement IFJ PAN has taken over the following tasks: 1. to assembly of the bus bar system powering the superconducting coils of the stellarator; 2. to take a part in design of equipment for handling, transportation and assembly of outer vessel; 3. to manufacture 30 sets of mechanics for polichromators used in plasma diagnostics; 4. to connect the bus bar systems between modules (at so called Module Separation Planes). The Task No 2 was completed in 2008, tasks No 1 and 3 – in 2011 and the Task No 4 - in 2012. General scope of the tasks 1, 2, 3 and the detail description of work done in 2008 – 2009 were presented in [1], [2], [3]. Work done in 2010 – 2011 was periodically reported in [4], [5]
Badanie właściwości termoluminescencyjnych polikrystalicznej struktury diamentowej wytworzonej metodą CVD w IFJ PAN
No full textW IFJ PAN wytworzono strukturę diamentu polikrystalicznego na 2” podkładzie krzemowym o grubości 2 mm w reaktorze CVD produkcji Seki Technotron. Średnia grubość utworzonej warstwy wynosi 118.9 μm. W celu zbadania właściwości termoluminescencyjnych naświetlono strukturę dawkami z zakresu 0.25 - 60 Gy, stosując aparat Theratron 780E ze źródłem Co-60. Sygnał TL mierzono planarnym czytnikiem detektorów termoluminescencyjnych. Próbka charakteryzuje się rozrzutem czułości na poziomie 280%. W widmie termoluminescencyjnym zaobserwowano 2 wyraźne piki w temperaturze 96ºC, 220ºC. W przedziałach dawek 0.25 – 2 Gy oraz 20 – 60 Gy stwierdzono liniową zależność od dawki, po anilacji próbki w temperaturze 400ºC czułość zmniejszyła się
Optymalizacja elementów układu formowania wiązki dla stanowiska radioterapii protonowej w IFJ PAN metodami symulacji Monte Carlo
No full textThe work is aimed at optimizing the proton beam spreading system at the IFJ PAN radiotherapy of ocular melanoma facility. Single scattering foil and double scattering foil systems have been investigated by Monte Carlo simulations. In the case of single scattering foil system dose distributions were uniform to within ± 1 % over a 4-cm-diameter region, whereas in the case of double scattering foil system the same uniformity was achieved in a region up to 3.6 cm in diameter, but its efficiency of dose rates was 5.7 times better. Since the total thickness of foils in the single and the double foil systems was equivalent, in both cases the energy loss was the same
The Plasma-Focus device at IFJ PAN Kraków: Status and Perspectives
No full textThe report presents the principle of operation of the Plasma Focus (PF) device and a description of the phenomena in the generation of hot, dense magnetized plasma. Here is a brief outline of its history and the current state of research conducted on these systems in various laboratories around the world. Against this background, the specification and operating parameters of PF-24, operating at the Laboratory of Neutron Sources (IFJ PAN) since 2014, have been described. The current state of the diagnostic systems used was presented as well as the main research objectives illustrated by the results obtained. Plans and perspectives for future experiments as well as related topics of doctoral dissertations were presented
Monte Carlo simulations of neutron and photon radiation fields at the PF-24 plasma focus device at IFJ PAN in Krakow
No full textThe medium scale PF‐24 facility was installed at the Institute of Nuclear Physics of the Polish Academy of Sciences (IFJ PAN), Poland. The MCNP model of the PF ‐ 24 device in the main hall of the laboratory was elaborated. Two variants of the plasma source emitting particles were considered: a point neutron source and a volume source with photon and neutron emission. Based on presented calculations the influence of the laboratory construction (the walls, the ceiling and the floor) on neutron and photon space distributions in the main hall were assessed. A study of fast uncolided and collided neutrons contributions to the total field of neutrons was performed. The contribution of photons emitted directly from the source and created as the result of neutron scattering was established. Neutron spectra at selected points were calculated
Analiza deformacji 6 metrowego teleskopu CTA przy uzyciu MES
No full textObecnie trwają prace nad projektem nowego obserwatorium promieniowania
gamma - Cherenkov Telescope Array (CTA). W raporcie przedstawiono część prac zrealizowanych w IFJ PAN dla CTA. Polegały one na przeprowadzeniu
przy użyciu MES (Ansys) analizy wytrzymałościowo-odkształceniowej jednego z projektowanych teleskopów - teleskop o „średnicy” czaszy 6 m zaproponowany
przez MPI-K Heiedelberg. Obliczenia objęły analizę deformacji czaszy pod wpływem obciążenia własnego, wiatrowego i temperaturowego
Linia eksperymentalna do napromieniania pojedynczych żywych komórek przy stanowisku mikrowiązki rentgenowskiej w IFJ PAN. Opis techniczny
No full textX-ray experimental microbeam line for single live cells irradiation has been constructed at the Institute of Nuclear Physics PAN. The facility is based on an open type X-ray tube with microfocusing (the X-ray emission spot size is about 2 micrometers in diameter) and anode exchange ability. In the microdosimetry experiment a Titanium anode with the 4.5 keV energy of Ka characteristic radiation line is used. The X-ray radiation, emitted from the spot into a cone of 120 degrees angle, is focused on the sample using the X-ray focusing multilayer mirrors in the Montel geometry. The focusing distance is 32 mm, and the focal spot is about 20 micrometers in diameter. The beam image can be observed using the X-ray sensitive CCD camera, as well as with the use of an optical microscope and the P43 scintillator screen. Cells are seeded on a thin mylar foil, which is mounted on a drilled opening in the bottom of the Petri dish. After visual selection of cells dedicated to irradiate, and setting of experimental parameters, the irradiation process is carried out automatically, and cells are irradiated with a controlled X-ray dose.Praca finansowana ze środków MNiSW, grant nr NN 518 295 54
Ablacja laserowa tarczy grafitowej z uzyciem lasera Nd:YAG o długosci fali 1064 nm
No full textDiamentopodobne powłoki weglowe sa obecnie intensywnie badane jako materiały o wielorakich potencjalnych zastosowaniach w elektronice, optyce i trybologii. W raporcie
przedstawiamy pierwsze warstwy amorficznego wegla uformowane metoda PLD w IFJ
PAN. Powłoki deponowane były na podłozach krzemowych w komorze prózniowej pod
cisnieniem 5x10¡5 mbar przez ablacje laserowa tarczy grafitowej. W eksperymencie
uzyto lasera Nd:YAG o długosci fali 1064 nm i gestosci energii w zakresie 10-50 J/cm2.
Mikrostruktura uzyskanych powłok została przebadana przy uzyciu spektroskopii Ramana
Preliminary test of the scintillator with optical fiber (SOF) detector in a pulsed thermal neutron experiment
No full textA scintillator with an optical fiber detector (SOF) consists of a small amount of the
ZnS(Ag) scintillator mixed with a transparent adhesive material and a thermal neutron
converter (6LiF). It is tightly connected to the tip of an optical fiber. The other tip is optically
coupled with a small photomultiplier. The SOF detector was assembled and checked in
Institute of Nuclear Physics (IFJ PAN). A preliminary test has been done to compare the SOF detector and the 3He proportional counter which has been used for a long time in the pulsed neutron experiments carried out in the Neutron Transport Physics Laboratory (IFJ). It was find that the SOF detector may be used successfully instead of the 3He proportional detector. Small dimmensions of the detector (diameter is about 2 mm) allow to obtain accurate information on the spatial distribution of the thermal neutron flux inside a small investigated system
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