• Y. Shoji
  LASTI, Hyogo

　Sub-THz coherent synchrotron radiation (CSR) from the SPing-8 linac beam was observed after the injection into the NewSUBARU storage ring. The beam from the linac has much sorter bunch length than the stationary stored bunch in the ring. It had been reported that the injected linac beam emits CSR at just after the injection until it diluted to a longer bunch by its energy spread. However we observed CSR at after more revolutions. At some tens of microseconds after the injection we observed CSR produced by a fine time structure in a bunch. At after more revolutions, a half of the synchrotron oscillation period (0.1 ms), CSR was back because the bunch length became shorter again. At this timing we also expect CSR emitted from a structure produced by longitudinal and transverse coupling, which should depend on the chromaticity. We report results of CSR observation through these periods.

• S. Okuda, T. Kojima, R. Taniguchi
  Osaka Prefecture University, Sakai

Transient phenomena induced by pulsed electron beams have been investigated with a pulse-radiolysis system with a 18 MeV S-band electron linac at Osaka Prefecture University (OPU). In our recent work the coherent transition radiation from the electron bunches of linac beams, which is highly intense pulsed light in a submillimeter to millimeter wavelength range, has been applied to absorption spectroscopy with an L-band electron linac in the Research Reactor Institute, Kyoto University. In these experiments the effect of intensity of the radiation has been observed for several kinds of matters. In this work a new pump-probe system has been developed to investigate the transient phenomena induced by the pulsed coherent radiation by improving the OPU pulse-radiolysis system. The transition radiation is emitted from an Al foil. A part of the coherent radiation is also used as probe light. The pulse lengths of the radiation are from 5 ns to 4 μs. The characteristics of the system have been measured and the system has been optimized. The coherent synchrotron radiation source is under preparation in order to obtain half-cycle light.

• O. A. Konstantinova
  Tomsk State University, Tomsk

In this paper the new phenomenon of nature, called electromagnetic torque radiation from the relativistic charged particles is discussed. To begin it is shown that two well ' known alternative definitions of density of angular momentum of electromagnetic field by Ivanenko-Sokolov* and by Teitelboim and Villarroel** give the identical integral characteristics with application of the relativistic radiation theory. And both of it yield the same results for the total power of the angular momentum, which is characterized the torque of the radiation. Then we have found that the angular distribution of torque from the Linac has the azimuthal symmetry with respect to the direction of the velocity of the particle. It is also oppositely directed to the acceleration of the particle. On the condition of the high speed the angular distribution has an expressive relativistic effect of the sharp directed radiation. With the construction of a good detectors of the torque it is possible to measure such effect.

* D. Ivanenko, A. Sokolov, Classical Field Theory, GITTL, 1949.
** C. Teitelboim, D. Villarroel, Rivista Nuovo Cim. 3, 1, 1980.

• F. Klarner, O. Boldt, W. Hillert, N. Hofmann, D. Krönung
  ELSA, Bonn
• S. Aderhold
  DESY, Hamburg

In order to enhance the operating capabilities of the Bonn University Accelerator Facility ELSA, a new injector is currently under commissioning. Its purpose is to allow a single pulse mode as well as to increase the current of the unpolarized beam provided to the external hadron physics experiments. The injector will produce an up to 2 μs long pulse of 500 mA beam current or a single electron bunch with 2 A pulse current. Design and optimization of the injector were performed with Egun, PARMELA and numerical simulations based on the paraxial equation. A 1.5 ns long pulse is produced by a thermionic electron gun with 90 kV anode-cathode voltage, then compressed and pre-accelerated by a 500 MHz RF cavity and a four-cell travelling wave buncher. After acceleration of the electrons up to 25 MeV in the main linac the natural broadening of the energy distribution in the particle ensemble due to the acceleration process will be reduced by an energy compression system. Studies have been conducted concerning the adaptation of the optical elements in the transfer beamline to the booster synchrotron with respect to the new requirements of the injection into the synchrotron and its acceptance.

• S. Emhofer, O. Chubarov, I. Hollenborg, C.M. Kleffner, V.L. Lazarev, M.T. Maier, H. Rohdjess, B. Schlitt, T. Sieber, B. Steiner, P. Urschütz
  Siemens Med, Erlangen
• H.K. Andersen, M. Budde, F. Bødker, J.S. Gretlund, H.B. Jeppesen, L. Kruse, C.V. Nielsen, C.G. Pedersen, Ka.T. Therkildsen, S.V. Weber
  Siemens DK, Jyllinge

Siemens is currently preparing, installing and commissioning three IONTRIS particle therapy accelerator systems - two in Germany, in Marburg and Kiel, and one in Shanghai, China. Siemens IONTRIS is based on a synchrotron to accelerate protons and carbon ions for clinical applications up to 250 MeV resp. 430 MeV/u. The injector part consists of an RFQ to accelerate protons and light ions up to 400 keV/u followed by an IH-cavity, wherein the particles achieve 7 MeV/u. The results of the commissioning of the RFQ in the test facility in Denmark will be presented.

*Particle Therapy is a work in progress and requires country-specific regulatory approval prior to clinical use.

• T. Roggen, H. De Gersem, J.P. Locquet, B. Masschaele
  KU Leuven, Kortrijk
• M. Zhukova
  Tomsk Polytechnic University, Nuclear Physics Institute, Tomsk

Large synchrotron radiation facilities have become one of the most powerful instruments for research today. All over the world new facilities are being constructed or designed. The biggest disadvantage of a large synchrotron facility is that the scientific experiments, which are often very sensitive and complex, have to be performed in a dedicated place, sometimes far away from the researcher's home laboratory. Promising compact synchrotron radiation sources, that fit in a typical research lab, have been proposed recently. In this paper results are presented of an initial study of a single body magnet, low electron energy storage ring, performed with the Finite Element (FE) and Finite Difference Time-Domain (FDTD) modeling possibilities in the CST Studio Suite 2010 software package. Insights were obtained for the most crucial components: the magnet yoke, the internal RF cavity and the resonance injection component. Finally, the model of the storage ring was verified using the particle tracker solver which tracks the injected electrons along the ring.