RuPAC2014 - List of Authors (Samsonov, E.)

Paper

Title

Page

Magnetic System of Isochronous Cyclotron F250 for Proton Therapy Applications

103

Yu.G. Alenitsky, E. Samsonov
JINR, Dubna, Moscow Region, Russia
N.L. Zaplatin
JINR/DLNP, Dubna, Moscow region, Russia

In the Laboratory of Nuclear Problems of the JINR the possibility of designing of the isochronous cyclotron F250 with the energy of protons 250 MeV on the basis of magnet with the diameter of pole 6 m, which is used for the synchro-cyclotron is examined. Synchro-cyclotron many years works for obtaining the protons with the energy 680 MeV and with the intensity of extracted beam 2.5 mkA. For the solution of medical problems the required energy of protons comprises not more than 250 MeV and depends on the depth of the tumor arrangement inside a patient. For determining the required energy of protons the information about the mean free path of protons in the correspondence for the position of Bragg's peak in each case is used. Necessary energy of protons is obtained by means of degrader system providing a retarding the extracted beam of protons with 680 MeV to 250 MeV and less. In this case the utilized for medical purposes intensity of beam does not exceed 50 nA. The proposed cyclotron F250 will make it possible to strongly decrease the electric power of magnet and to avoid the need of beam degradation from 680 MeV to 250 MeV. For creating the required magnetic field of the cyclotron F250 it is necessary to change the form of steel spiral shims and disks, located inside a vacuum chamber of synchro-cyclotron. The basic parameters of the magnetic system of the cyclotron F250 with the condition of retaining the vacuum chamber and the magnet yoke of synchro-cyclotron are given.

WEPSB28

Design Studies of the Superconducting Cyclotrons for Proton Therapy

G.A. Karamysheva, S.A. Kostromin, N.A. Morozov, E. Samsonov, E. Syresin
JINR, Dubna, Moscow Region, Russia
S.N. Dolya
JINR/DLNP, Dubna, Moscow region, Russia

Different projects of the cyclotrons for proton therapy were considered in order to provide Medical Technical Complex at JINR, Dubna by proton beam. Our projects can be used for development of the accelerator for proton therapy for the other medical centers. We propose project of the superconducting cyclotron accelerating protons up to energy 250 MeV and superconducting synchrocyclotron which can be used as the 70 MeV protons source for radiation therapy of the shallow-allocated tumors. Conceptual designs of cyclotrons are considered. Main parameters of the magnetic and accelerating systems are chosen. Main aspects of the beam dynamics are studied by means of simulation of the acceleration in the main region of radii, in the extraction region and simulation of the particles capture into acceleration in the very center of the machine.

Paper	Title	Page
TUPSA31	Magnetic System of Isochronous Cyclotron F250 for Proton Therapy Applications	103
	Yu.G. Alenitsky, E. Samsonov JINR, Dubna, Moscow Region, Russia N.L. Zaplatin JINR/DLNP, Dubna, Moscow region, Russia
	In the Laboratory of Nuclear Problems of the JINR the possibility of designing of the isochronous cyclotron F250 with the energy of protons 250 MeV on the basis of magnet with the diameter of pole 6 m, which is used for the synchro-cyclotron is examined. Synchro-cyclotron many years works for obtaining the protons with the energy 680 MeV and with the intensity of extracted beam 2.5 mkA. For the solution of medical problems the required energy of protons comprises not more than 250 MeV and depends on the depth of the tumor arrangement inside a patient. For determining the required energy of protons the information about the mean free path of protons in the correspondence for the position of Bragg's peak in each case is used. Necessary energy of protons is obtained by means of degrader system providing a retarding the extracted beam of protons with 680 MeV to 250 MeV and less. In this case the utilized for medical purposes intensity of beam does not exceed 50 nA. The proposed cyclotron F250 will make it possible to strongly decrease the electric power of magnet and to avoid the need of beam degradation from 680 MeV to 250 MeV. For creating the required magnetic field of the cyclotron F250 it is necessary to change the form of steel spiral shims and disks, located inside a vacuum chamber of synchro-cyclotron. The basic parameters of the magnetic system of the cyclotron F250 with the condition of retaining the vacuum chamber and the magnet yoke of synchro-cyclotron are given.

WEPSB28	Design Studies of the Superconducting Cyclotrons for Proton Therapy
	G.A. Karamysheva, S.A. Kostromin, N.A. Morozov, E. Samsonov, E. Syresin JINR, Dubna, Moscow Region, Russia S.N. Dolya JINR/DLNP, Dubna, Moscow region, Russia
	Different projects of the cyclotrons for proton therapy were considered in order to provide Medical Technical Complex at JINR, Dubna by proton beam. Our projects can be used for development of the accelerator for proton therapy for the other medical centers. We propose project of the superconducting cyclotron accelerating protons up to energy 250 MeV and superconducting synchrocyclotron which can be used as the 70 MeV protons source for radiation therapy of the shallow-allocated tumors. Conceptual designs of cyclotrons are considered. Main parameters of the magnetic and accelerating systems are chosen. Main aspects of the beam dynamics are studied by means of simulation of the acceleration in the main region of radii, in the extraction region and simulation of the particles capture into acceleration in the very center of the machine.