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cyclotron

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CT10 Beam Diagnostics in the AGOR Cyclotron diagnostics, instrumentation, ion 80
 
  • S. Brandenburg, W.K. van Asselt, H. Post, H.W. Schreuder
    KVI, Kernfysisch Versneller Instituut, Groningen, The Netherlands
  • B. Launé
    IPN, Institut de Physique Nucléaire, Orsay, France
  The beam diagnostics equipment in modern multi-particle, multi-energy cyclotrons for research in nuclear physics is reviewed, using the superconducting cyclotron AGOR at the KVI as an example. An extensive set of diagnostics tools has been integrated already in the design stage. It includes three scanning probes for beam centering, a scanning probe for the measurement of radial and vertical beam oscillations and beamlosses, beam phase pick-ups to optimize isochronism of the magnetic field and profile and current measurements along the beam path through the four movable extraction elements. The operating experience gained since the start-up of the cyclotron in 1996 is discussed for the various diagnostics tools and improvements are described.  
 
PM26 A System For Beam Diagnostics in the External Beam Transportation Lines of the DC-72 Cyclotron diagnostics, instrumentation, medical accelerators, emittance, pick-up, DC-72 155
 
  • A. Gall
    DNPT, FEI STU Bratislava, Slovakia
  • G.G. Gulbekian, B.N. Gikal, I.V. Kalagin, V.I. Kazacha
    JINR, FLNR JINR Dubna, Russia
  The isochronous four-sector Cyclotron DC-72 will serve as the basic facility of the Cyclotron Center of the Slovak Republic in Bratislava. It will be used for accelerating ion beams of H- to Xe up to energy of 72-2.7 MeV/nucleon. In the present work a system for external beam diagnostics is presented, which is intended for on-line acquisition of data on the main parameters of accelerated beams (current, position, profile, emittance and energy of the ion beams) to allow effective tuning of the accelerator operation regime as well as ion beam transport along the transport lines through the ion optical systems to physical targets and set-ups.  
 
PT12 Beam Phase Measurements in the AGOR Cyclotron diagnostics, instrumentation, ion, longitudinal-dynamics 193
 
  • S. Brandenburg, H.W. Nijboer, W.K. van Asselt
    KVI, Kernfysisch Versneller Instituut, Groningen, The Netherlands
  Beamphase measurement to optimize the isochronism is an essential part of the diagnostics in multi-particle, multi-energy cyclotrons. In the AGOR cyclotron an array of 13 nondestructive beamphase pick-ups is installed. To reduce the large disturbances from the RF-system the measurements are traditionally performed at the 2nd harmonic of the RF-frequency. To further improve the sensitivity intensity modulation of the beam has been introduced. This creates side-bands in the Fourier spectrum, that are completely free of interference from the RF-system. These side-bands contain information on both the beamphase with respect to the accelerating voltage and the number of revolutions up to the radius of the measurement. A specific case is intensity modulation at the orbital frequency, where the side-bands contain only information on the beamphase. Measurements with the different methods will be presented, demonstrating that the intensity modulation strongly improves the sensitivity of the measurement. Useful beamphase measurements can now be made for beam intensities down to 10 nA.