It is proposed to use a Side Coupled Linac (SCL), starting at 30MeV, up to 230MeV for protontherapy. The linac consists of 25 modules (two tanks each). Twelve 3GHz power generators feed two modules each in parallel and one power generator feeds the last module. The SCL is designed, assuming a mean accelerating field in the cavities of 16,5MV/m. The longitudinal and transverse beam dynamics have been studied, assuming that the input parameters emittance, energy spread and mean current are those of commercial 30MeV cyclotrons. The characteristics of the output beam were analysed: the transmittance value is largely sufficient to deliver a correct dose for therapy; the beam line activation is kept largely below allowed levels; the output energy spread is sufficiently small. The first prototype module is under construction and a second one is under design. Contacts with e2v have been established for defining an agreement, which foresees to use magnetrons as feeders for the acceleration tests. Attention was therefore paid to phase locking constraints among feeders. Theoretical studies suggest that transmittance is not significantly affected if de-phasing is kept into values that seem attainable with phase-locked magnetrons. A first investigation was performed on the possibility of resorting to a 18MeV cyclotron. The results were stimulating.
|Titolo:||Optimization design of a side coupled linac (SCL) for protontherapy : a new feeding solution|
MAURI, MARCO (Penultimo)
|Parole Chiave:||SCL linac; hadrontherapy; beam dynamics|
|Settore Scientifico Disciplinare:||Settore ING-INF/01 - Elettronica|
|Data di pubblicazione:||2006|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|