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Modification of the fault logic circuit of a high‐energy linear accelerator to accommodate selectively coded, large‐field wedges
Author(s) -
Miller R. W.,
van de Geijn J.
Publication year - 1987
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596081
Subject(s) - linear particle accelerator , field (mathematics) , energy (signal processing) , particle accelerator , logic gate , physics , computer science , electrical engineering , optics , engineering , mathematics , beam (structure) , quantum mechanics , pure mathematics
A modification to the fault logic circuit that controls the collimator (COLL) fault is described. This modification permits the use of large‐field wedges by adding an additional input into the reference voltage that determines the fault condition. The resistor controlling the amount of additional voltage is carried on board each wedge, within the wedge plug. This allows each wedge to determine its own, individual field size limit. Additionally, if no coding resistor is provided, the factory‐supplied reference voltage is used, which sets the maximum allowable field size to 15 cm. This permits the use of factory‐supplied wedges in conjunction with selected, large‐field wedges, allowing proper sensing of the field size maximum in all conditions.