Device and method for regulating intensity of a beam...

H - Electricity – 05 – H

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H05H 13/00 (2006.01) H05H 7/00 (2006.01)

Patent

CA 2449307

The invention concerns a device (10) for regulating the intensity of a beam extracted from a particle accelerator, such as a cyclotron, used for example for protontherapy, said particles being generated from an ion source. The invention is characterised in that it comprises at least: a comparator (90) determining a difference .epsilon. between a digital signal I¿R? representing the intensity of the beam measured at the output of the accelerator and a setpoint value I¿C? of the beam intensity: a Smith predictor (80) which determines on the basis of the difference .epsilon., a corrected value of the intensity of the beam I¿P?; an inverted correspondence table (40) supplying, on the basis of the corrected value of the intensity of the beam I¿P? a setpoint value I¿A? for supplying arc current from the ion source (20).

La présente invention se rapporte ô un dispositif (10) de régulation de l'intensité du faisceau extrait d'un accélérateur de particules, tel qu'un cyclotron, utilisé par exemple pour la protonthérapie, lesdites particules étant générées à partir d'une source d'ions, caractérisé en ce qu'il comporte au moins :- un comparateur (90) déterminant un écart e entre un signal digital IR représentatif de l'intensité du faisceau mesurée à lasortie de l'accélérateur et une valeur de consigne IC de l'intensité du faisceau;- un prédicteur de Smith (80), qui détermine partir de l'écart e, une valeur corrigée de l'intensité de faisceau IP;- une table de correspondance inversée (40), fournissant, ô partir de la valeur corrigée de l'intensité de faisceau IP, une valeur de consigne IA pour l'alimentation du courant d'arc de la source d'ions (20).

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