Electromagnetic radiation of relativistic channeling particles (the Kumakhov effect)

Desirable and inevitable phase-space modifications for heavy ions propagating through matter and ion-optical systems are described. Some aspects of the interaction of energetic ions with matter incorporated in ion-optical devices and the use of profiled targets at relativistic energies are discussed. A variety of measured and calculated results is presented which demonstrates interesting applications, including the interaction of heavy ions under channeling conditions or with free electron targets, and the separation and implantation of radioactive beams. As examples, some of the new GSI projects are briefly presented which illustrate the growing importance of non-Liouvillian ion-optics.

Ions penetrating through ion-optical systems and matter — non-liouvillian phase-space modelling

Spin precession of channeled particles in bent crystals has been observed for the first time. Polarized SIGMA+ were channeled using bent Si crystals. These crystals provided an effective magnetic field of 45 T which resulted in a measured spin precession of 60-degrees +/- 17-degrees. This agrees with the prediction of 62-degrees +/- 2-degrees using the world average of SIGMA+ magnetic moment measurements. This new technique gives a SIGMA+ magnetic moment of (2.40 +/- 0.46 +/- 0.40),mu(N), where the quoted uncertainties are statistical and systematic, respectively. We see no evidence of depolarization in the channeling process.

/pdf/first-observation-of-magnetic-moment-precession-of-channeled-1dpksq2iwt.pdf

First observation of magnetic moment precession of channeled particles in bent crystals

During the latest decade, experiments have been performed at the CERN SPS to investigate the use of high-energy channeled nuclei in bent crystals for extraction, beam splitting and beam bending. An understanding of channeling in a bent crystal with extraction and deflection efficiencies for different energies, crystal types and ions has been developed. Furthermore, the long-standing question of radiation damage has been addressed with encouraging outcome. This makes extrapolations possible for the construction of, e.g., an extraction device for the LHC at CERN, RHIC at Brookhaven or new splitting elements in high-energy beams.We present the main results obtained and discuss existing and future applications of bent crystals in high-energy physics.

Channeling of high-energy particles in bent crystals – Experiments at the CERN SPS

Bending of GeV particle beams by channeling in bent crystal planes

Steering of charged particle trajectories by a bent crystal

Steering of charged-particle trajectories by means of a curved single crystal

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Steering of charged particle trajectories by a bent crystal

Steering of charged-particle trajectories by means of a curved single crystal