I am an accelerator physicist with experience in theoretical and experimental accelerator physics in the fields of beam optics and particle tracking.My main research topics are beam optics and dynamics of the ions in the injection/extraction system and during acceleration. Numerical calculations of charged particle trajectories through electric and magnetic fields are essential for this kind of research. I am ably to design and test the ion beam transport line as well as each of its individual components. I have basic knowledge of electronics and related measurement techniques. I have very good experience with 2D and 3D electromagnetic field solvers and/or particle tracking codes. I am very good programmer (FORTRAN, C/C ) and I am ably to modify many of the particle tracking codes.I have been involved in design aspects of the International Linear Collider (ILC), focusing mainly on the beam delivery system and machine-detector interface (including the detailed layout of the interaction region). The latter work involves study of the beam-beam interaction and disrupted beam transport.
Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, de... more Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, describes the detectors which will record and measure the charged and neutral particles produced in the ILC's high energy e+ e-collisions. The physics of the ILC, and the environment of the machine-detector interface, pose new challenges for detector design. Several conceptual designs for the detector promise the needed performance, and ongoing detector R&D is addressing the outstanding technological issues. Two such detectors, ...
Ferromagnetism in Hf6Co23 intermetallic alloy at room temperature has been confirmed from perturb... more Ferromagnetism in Hf6Co23 intermetallic alloy at room temperature has been confirmed from perturbed angular correlation measurements using 181Hf probe. The strength of hyperfine magnetic field at room temperature for this intermetallic compound has been found to be B hf = 2.5 ( 2 ) T while the earlier report of hyperfine magnetic field in Hf6Co23 has discrepancy. The hyperfine magnetic field at Ta impurity site has also been calculated by density functional theory and the result is found to be B hf = - 4.964 T (at 0 K). This value is closer to the present experimental value measured at 298 K. The compound Hf6Co23 has been found to decompose reversibly to Hf2Co7 at 473 K. Ferromagnetism in this material has been found up to 423 K and its Curie temperature is, therefore, set as T C > 423 K. From recent measurements by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, electron probe microanalysis and differential scanning calorimetry, Hf6Co23 was rep...
Intermetallic compounds Zr9Ni11 and Hf9Ni11 have been studied by time-differential perturbed angu... more Intermetallic compounds Zr9Ni11 and Hf9Ni11 have been studied by time-differential perturbed angular correlation (TDPAC) spectroscopy. Multiphase components have been found in both these compounds. In Zr9Ni11, the phase Zr9Ni11 is found to be predominant (89%) at room temperature. Besides this, a secondary phase due to Zr8Ni21 is found (11%). From temperature-dependent TDPAC studies, it is found that Zr9Ni11 is unstable at higher temperature (>773 K). At 773 K, Zr9Ni11 partially decomposes to Zr7Ni10 and at 973 K, it is completely decomposed to ZrNi and Zr7Ni10. This compositional phase change from Zr9Ni11 to ZrNi and Zr7Ni10 is not reversible and we do not retrieve Zr9Ni11 at remeasured room temperature. In stoichiometric Hf9Ni11, the phase HfNi is found to be predominant (81%) while the phase due to Hf9Ni11 is found as a minor phase (19%). However, no compositional phase change at higher temperature is found in Hf9Ni11. After heating the sample at 873 K, the same two phases of ...
In this paper we compared analytical and numerical results of axial focusing in the acceleration ... more In this paper we compared analytical and numerical results of axial focusing in the acceleration gaps in the central region of the cyclotron. In the case of analytical method we considered only the electrical focusing properties of the acceleration gaps. In the case of numerical method we analysed the ion trajectories which include both the electric and magnetic fields data. The electrical field distribution in the four acceleration gaps has been numerically calculatied by program RELAX3D. The numerical orbit computations have been carried out by means of the computer code CYCLONE. The analytical and numerical calculation was done for protons and h=1 mode of acceleration.
In this memo we present new final doublet parameters for the small crossing angle layout of the In... more In this memo we present new final doublet parameters for the small crossing angle layout of the International Linear Collider. We use NbTi technology for the 500 GeV layout and Nb3 Sn technology for the 1 TeV machine. The charged beam and radiative Bhabha power losses for the new High Luminosity parameter set are also presented.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2002
ABSTRACT This paper describes the design of the central region in the Gustaf Werner cyclotron for... more ABSTRACT This paper describes the design of the central region in the Gustaf Werner cyclotron for h=1, 2 and 3 modes of acceleration. The electric field distribution in the inflector and in the four acceleration gaps has been numerically calculated from an electric potential map produced by the program RELAX3D. The geometry of the central region has been tested with the computations of orbits carried out by means of the computer code CYCLONE. The optical properties of the spiral inflector and the central region were studied by using the programs CASINO and CYCLONE, respectively.
The results of beam profile measurements of the proton beam of the ACCEL K250 superconducting cyc... more The results of beam profile measurements of the proton beam of the ACCEL K250 superconducting cyclotron at the Paul Scherrer Institute are presented in this paper. Beam emittances in both horizontal and vertical planes are estimated by the varying quadrupole method.
Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, de... more Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, describes the detectors which will record and measure the charged and neutral particles produced in the ILC's high energy e+ e-collisions. The physics of the ILC, and the environment of the machine-detector interface, pose new challenges for detector design. Several conceptual designs for the detector promise the needed performance, and ongoing detector R&D is addressing the outstanding technological issues. Two such detectors, ...
Ferromagnetism in Hf6Co23 intermetallic alloy at room temperature has been confirmed from perturb... more Ferromagnetism in Hf6Co23 intermetallic alloy at room temperature has been confirmed from perturbed angular correlation measurements using 181Hf probe. The strength of hyperfine magnetic field at room temperature for this intermetallic compound has been found to be B hf = 2.5 ( 2 ) T while the earlier report of hyperfine magnetic field in Hf6Co23 has discrepancy. The hyperfine magnetic field at Ta impurity site has also been calculated by density functional theory and the result is found to be B hf = - 4.964 T (at 0 K). This value is closer to the present experimental value measured at 298 K. The compound Hf6Co23 has been found to decompose reversibly to Hf2Co7 at 473 K. Ferromagnetism in this material has been found up to 423 K and its Curie temperature is, therefore, set as T C > 423 K. From recent measurements by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, electron probe microanalysis and differential scanning calorimetry, Hf6Co23 was rep...
Intermetallic compounds Zr9Ni11 and Hf9Ni11 have been studied by time-differential perturbed angu... more Intermetallic compounds Zr9Ni11 and Hf9Ni11 have been studied by time-differential perturbed angular correlation (TDPAC) spectroscopy. Multiphase components have been found in both these compounds. In Zr9Ni11, the phase Zr9Ni11 is found to be predominant (89%) at room temperature. Besides this, a secondary phase due to Zr8Ni21 is found (11%). From temperature-dependent TDPAC studies, it is found that Zr9Ni11 is unstable at higher temperature (>773 K). At 773 K, Zr9Ni11 partially decomposes to Zr7Ni10 and at 973 K, it is completely decomposed to ZrNi and Zr7Ni10. This compositional phase change from Zr9Ni11 to ZrNi and Zr7Ni10 is not reversible and we do not retrieve Zr9Ni11 at remeasured room temperature. In stoichiometric Hf9Ni11, the phase HfNi is found to be predominant (81%) while the phase due to Hf9Ni11 is found as a minor phase (19%). However, no compositional phase change at higher temperature is found in Hf9Ni11. After heating the sample at 873 K, the same two phases of ...
In this paper we compared analytical and numerical results of axial focusing in the acceleration ... more In this paper we compared analytical and numerical results of axial focusing in the acceleration gaps in the central region of the cyclotron. In the case of analytical method we considered only the electrical focusing properties of the acceleration gaps. In the case of numerical method we analysed the ion trajectories which include both the electric and magnetic fields data. The electrical field distribution in the four acceleration gaps has been numerically calculatied by program RELAX3D. The numerical orbit computations have been carried out by means of the computer code CYCLONE. The analytical and numerical calculation was done for protons and h=1 mode of acceleration.
In this memo we present new final doublet parameters for the small crossing angle layout of the In... more In this memo we present new final doublet parameters for the small crossing angle layout of the International Linear Collider. We use NbTi technology for the 500 GeV layout and Nb3 Sn technology for the 1 TeV machine. The charged beam and radiative Bhabha power losses for the new High Luminosity parameter set are also presented.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2002
ABSTRACT This paper describes the design of the central region in the Gustaf Werner cyclotron for... more ABSTRACT This paper describes the design of the central region in the Gustaf Werner cyclotron for h=1, 2 and 3 modes of acceleration. The electric field distribution in the inflector and in the four acceleration gaps has been numerically calculated from an electric potential map produced by the program RELAX3D. The geometry of the central region has been tested with the computations of orbits carried out by means of the computer code CYCLONE. The optical properties of the spiral inflector and the central region were studied by using the programs CASINO and CYCLONE, respectively.
The results of beam profile measurements of the proton beam of the ACCEL K250 superconducting cyc... more The results of beam profile measurements of the proton beam of the ACCEL K250 superconducting cyclotron at the Paul Scherrer Institute are presented in this paper. Beam emittances in both horizontal and vertical planes are estimated by the varying quadrupole method.
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Papers by Dragan Toprek