Multi-Turn Extraction

 Measurements Movies

 Some experimental results are shown here. They refer to the proposed adiabatic capture of charged particles in stable islands of transverse phase space.

• Year 2007
  • Exciting the unstable 1/3rd resonance the central island (beam core) is depleted. In the movie the evolution of the beam profile is shown.
    It was measured at a single machine section by means of horizontal flying wire installed in section 54 of the CERN Proton Synchrotron. Essentially no losses are observed for a moderate separation of the beamlets. No optimization of the working point was performed due to problems with the beam instrumentation.
    The beam used is a single-bunch, medium-intensity (about 2.6x10¹²) proton beam (movie section 54).
  • The 1/5th stable resonance was also crossed. No beam losses were observed. The beam used is a single-bunch, medium-intensity (about 2.6x10¹²) proton beam. The movie shows a superposition of different measurements in terms of the octupole settings during the trapping process (movie section 54).
  Year 2006
  • Exciting an unstable resonance the central island (beam core) is depleted.
  • In the movie the evolution of the beam profile is shown. It was measured at two different machine sections by means of horizontal flying wires installed in section 54 and 64 of the CERN Proton Synchrotron.
  • The beam used is a single-bunch, medium-intensity (about 2.6x10¹²) proton beam
    (movie section 54, movie section 64).
  • The residual central island (beam core) has been observed by scraping the outer four islands (image section 54).
• Year 2004
• In the movie the evolution of the beam profile is shown. It was measured at two different machine sections by means of horizontal flying wires installed in section 54 and 64 of the CERN Proton Synchrotron.
• The beam used is a single-bunch, high-intensity (about 6x10¹²) proton beam
  (movie section 54, movie section 64).
• Year 2002
  • In the movie the evolution of the beam profile is shown. It was measured by means of a horizontal flying wire installed in section 64 of the CERN Proton Synchrotron.
  • The beam used is a single-bunch, low-intensity (about 5x10¹¹) proton beam
    (movie).