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| WECAMH03 | Analysis of the Particle Dynamics Stability in the Penning-Malmberg-Surko Trap | dipole, cyclotron, experiment, plasma | 64 |
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| Present report refers to the problem of the study of charged particle dynamics in the Penning-Malmberg-Surko trap. Various models of particle dynamics describing the magnetron and cyclotron motions are considered. Representation of the solutions in the form of a series is used for the magnetron motion. The problems of the stability of the magnetron motion are investigated. | |||
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| TUPSA040 | S-Band Choke Mode Cavity for Low Energy Storage Ring | cavity, HOM, storage-ring, electron | 300 |
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Several variants of a low-energy storage ring for Thomson scattering X-ray source were considered in *. The most promising variant "C" of the ring with small dimensions and large dynamic aperture has also large momentum compaction factor, which would lead to too long bunches with RF cavity operating at 714 MHz, so shorter wavelength must be used. In this paper we present results of optimization of S-band double-cells cavity with parasitic mode damping by chokes similar to **. Interaction of the bunch circulating in the ring with cavity parasitic modes is simulated.
* L. Ovchinnikova, V. Shvedunov, A. Mikhailichenko et al.. A comparative study of low energy compact storage rings for a thomson scattering x-ray source. Proc. of IPAC-16, 2016, pp. 3308-3310. ** T. Shintake, The Choke Mode Cavity, Jpn. J. Appl. Phys, Vol. 31,1992, pp. L1567-L1570, No. 1lA |
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| WEPSB039 | New Techniques for Operation and Diagnostics of Relativistic Electron Coolers | electron, photon, laser, solenoid | 449 |
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| The Helmholtz Institut Mainz (HIM) performs experiments related to possible improvements of high-energy d.c.-electron coolers. Results and activities concerning non-invasive beam diagnostics and beam control at large operating currents will be shown. Furthermore, progress of our project to use turbo generators as a means for potential-free power generation in high-energy electron coolers is presented. | |||
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| WEPSB045 | The Way To Improve Conformity Of Proton Therapy | proton, target, radiation, ion | 464 |
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Funding: Institute for nuclear research of RAS (INR), Moscow 117312, Russia In the case of small tumors the pencil beam width may be comparable with the target size. In these cases the application of classic method of passive beam scattering with a one-stage formation of dose distribution may be reasonable. However, the last method in its standard implementation fails to provide the dose conformity: either the maximal dose exceeds the tumor volume on its proximate site or the dose deviates too much within the tumor. In order to overcome this shortcoming of the passive scattering method, we suggest a new construction of a two-component ridge filter (the corresponding patent is pending). We have performed a series of calculations with the Monte-Carlo code SRNA in order to find the optimal construction from the point of view of dose delivery accuracy and of the device manufacturability. With that ridge filter the 95% isodose does not notably leave the tumor volume. The usual 'wings' of isodoses on proximate side are now absent and the volume of irradiated healthy tissue is significantly reduced. The experimental tests with proton beams are now in progress. |
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| WEPSB071 | Charged Beams Optical Properties of Scattering Media | target, emittance, interface, optics | 521 |
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| In some accelerator based applications scattering media are placed on beam path. It may be internal beam target, dielectric film or metallic foil to separate volumes with different gas pressure during beam extraction from accelerator, roughing target in charge changing injection in circular accelerator and storage ring and so on. In particular cases detailed knowledge of beam dynamics in scattering media is necessary. This is especially true, for example, in the case of recovery energy accelerator where accelerated in superconducting linac high energy electron beam is directed again to accelerator after interaction with target. Distribution function for scattering angle and transverse displacement is used to derive the phase-plane portrait transformation in scattering medium for incoming charged particle beam. The phase-plane portrait of scattered beam depends strongly on incoming beam ellipse proportions and orientation, and simple matching conditions and expression has been derived. It is shown as well that in heterogeneous medium incident beam experiences trajectory refraction at the out coming medium border. Refraction factor has been calculated for an off-normal incidence of a beam. It is worth to note that refractive property of scattering media may for used for beam focusing. | |||
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| THPSC046 | High-Power High-Temperature Graphite Beam Dump for E-Beam Irradiation Test of Prototype IF Target in RISP | target, electron, simulation, experiment | 632 |
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| Nowadays project RISP is developed in IBS, Daejeon. One of the main project device is graphite target system meant for production of rare isotopes by means of the in-flight fragmentation (IF) technique. The power inside the target system deposited by the primary beam with energy of 200 MeV/u is estimated to be around 100 kW. The target represents rotating multi-slice graphite disc cooled by thermal radiation. Necessary step of target development is integrated test of target prototype under high power electron beam modelling real energy deposit into target. This test is planned to be held in BINP, Novosibirsk, with the use of ELV-6 accelerator. Heavy-ion beam will be modelled by the e- beam of ELV-6 accelerator with diameter down to ~1 mm and energy 800 keV (minimum possible). IF target is not full stopping target for an electron beam with energy 800 keV. Considerable part of beam energy will be not absorbed by a target material and must be deposited into special beam dump. In this paper the design of beam dump of the graphite cone geometry cooled by thermal irradiation is described. | |||
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| THPSC052 | The Longitudinal Broadband Impedance and Energy Spread Measurements at VEPP-4M | impedance, synchrotron, damping, electron | 650 |
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| The paper presents studies of the longitudinal broadband impedance of VEPP-4M and measurements of its bunch energy spread at different energies in range of 1.45 - 3.5 GeV. In order to measure the longitudinal bunch size at different currents we used PS-1/S1 streak camera with picosecond temporal resolution. Considering that influence of collective effects is negligible at low currents we determined bunch energy spread from its length at low currents. Collected bunch length data demonstrate microwave instability thresholds and potential well distortion lengthening. Potential well distortion was studied at 3 GeV and 3.5 GeV. Measured potential well distortion lengthening was used to estimate a value of the reactive part of the longitudinal impedance. Observed microwave instability thresholds was used to measure the value of broadband impedance. Measured value of the VEPP-4M is 7.9 ± 1.5 Ohm. | |||
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