محاسبات دینامیک باریکۀ شبکۀ سینکروترون برای شتاب باریکۀ پروتون به منظور استفاده در پروتون‌تراپی

هدف این تحقیق طراحی سامانۀ شتابدهنده برای تولید پروتون‌های دارای انرژی حدود 250 میلیون الکترون‌ولت برای پروتون‌تراپی است. بدین منظور، سیکلوترون 30 مگا الکترون‌ولتی واقع در سازمان انرژی اتمی کرج که قادر است باریکۀ پروتون را حداکثر تا 30 مگا الکترون‌ولت شتاب دهد به یک شتاب‌دهندۀ سینکروترن پروتونکه برای اهداف پزشکی طراحی شده است تزریق می شود. برای این طراحی از دو کد کامپیوتری madxو agileاستفاده شده است.

Lattice Design of Synchrotron for Proton Beam

A compact model of synchrotron accelerator facility is proposed for the treatment of deepseated tumors with proton therapy. The extracted beam from the existing C30 cyclotron is first injected into the modelled synchrotron. The injected beam is specified with its longitudinal plane as well as its horizontal and vertical emittances. For this design to be compatible with the cyclotron C30, the synchrotron should be kept compact and the number of magnet components must be low. The modeled synchrotron layout is designed using the computer codes MADX and AGILE in order to accelerate the injection proton ions from 30 MeV to a maximum extraction energy of 250 MeV with magnetic rigidity of 2.433 Tm. In this lattice arrangement with phase advance of about 90 degrees in two horizontal and vertical planes doublet cells are utilized. This ring consists of two long straight sections for RF and injection/extraction equipment, as well as four short straight sections. For chromaticity correction, two families of sextupoles are used. To prohibit emittance growth, a matching at injection in longitudinal plane was performed. The proton beam energy spread of 2% can be improved to 0.1% at injection by using the designed achromatic system. For the proton beam acceleration, a RF cavity with an approximate voltage of 160 V with a frequency in the range of 2.3 up to 14 MHz is used.