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You searched for subject:(superconducting synchrocyclotron). One record found.

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EPFL

1. Garonna, Adriano. Cyclotron Designs for Ion Beam Therapy with Cyclinacs.

Degree: 2011, EPFL

This thesis presents new superconducting compact (as opposed to separated-sector ) cyclotron designs for injection in CABOTO, a linac developed by the TERA Foundation delivering C6+/H2+ beams up to 400 MeV/u for ion beam therapy. This association of a variable energy linac injected by a fixed energy cyclotron is called cyclinac. Two superconducting cyclotron designs are compared under the same design constraints and methods: a synchrocyclotron and an isochronous cyclotron, both at the highest possible magnetic field and with an output energy of 230 MeV/u. This energy allows to use the cyclotron as a stand-alone accelerator for protontherapy. Once the optimal cyclotron is determined, lower energy cyclotrons can easily be designed. The short pulse length (1.5 µs), fast repetition rate (100-300 Hz) and small beam transmission of the cyclinac (0.2%) require intense pulsed ion sources. To deliver the desired clinical dose rate, the average pulse current of 60 eµA of C6+ at 300 Hz can be produced by three commercial EBIS (EBIS-SC by Dreebit Gmbh) operating at 100 Hz and connected to the beamline in alternating mode. A multicusp ion source is sufficient to produce compatible H2+ beams. The synchrocyclotron design features a central magnetic field of 5 T, an axisymmetric pole and a constant field index of 0.02. The beam is injected axially with a spiral inflector (K = 1.4). A static magnetic perturbation of 0.1 T and 5° width boosts the beam radial gain per turn (with no emittance degradation) by exciting the first radial integer resonance and thus allows beam ejection with moderate beam losses (30%). The RF system operates in first harmonic (Q = 2500). The 180° Dee provides 28 kV peak voltage and the RF is modulated (30-38 MHz) by a rotating capacitor (90-900 pF). The synchrocyclotron's best features are the simple and compact magnet (300 tons) and the low RF power requirements (30 kW power supply). The isochronous cyclotron design features a 3.2 T central magnetic field, four sectors and a pole characterized by elliptical gaps in the hills (3-30 mm) and in the valleys (11-50 cm). Spiraling is minimized (80° total hill axis rotation) and beam ejection is achieved with a single electrostatic deflector placed inside an empty valley. The two RF cavities operate in fourth harmonic at 98 MHz (Q = 7100). The RF system provides peak voltages of 70-120 kV and is powered by a single 100 kW unit. The synchrocyclotron reliability is brought into question by the need of a rotating capacitor and by the complexity of the injection and ejection systems. However, the isochronous cyclotron requires a much more complex magnet. Overall, the isochronous cyclotron is a better solution compared to the synchrocyclotron, because it is as compact but more reliable.… Advisors/Committee Members: Rivkin, Leonid, Amaldi, Ugo.

Subjects/Keywords: carbon ion therapy; cyclinac; hadrontherapy; particle therapy; superconducting cyclotron; superconducting synchrocyclotron

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APA (6th Edition):

Garonna, A. (2011). Cyclotron Designs for Ion Beam Therapy with Cyclinacs. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/167906

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Garonna, Adriano. “Cyclotron Designs for Ion Beam Therapy with Cyclinacs.” 2011. Thesis, EPFL. Accessed December 05, 2019. http://infoscience.epfl.ch/record/167906.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Garonna, Adriano. “Cyclotron Designs for Ion Beam Therapy with Cyclinacs.” 2011. Web. 05 Dec 2019.

Vancouver:

Garonna A. Cyclotron Designs for Ion Beam Therapy with Cyclinacs. [Internet] [Thesis]. EPFL; 2011. [cited 2019 Dec 05]. Available from: http://infoscience.epfl.ch/record/167906.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Garonna A. Cyclotron Designs for Ion Beam Therapy with Cyclinacs. [Thesis]. EPFL; 2011. Available from: http://infoscience.epfl.ch/record/167906

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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