Characterization of Graphene Stripper Foils in 11-MeV Cyclotrons

Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): Sergey Korenev, Rick Dishman, Alberto Yebra, Nikolay Meshcheryakov, Ilya Smirnov, Igor Pavlovsky, Richard Fink An experimental study of the use of graphene as an extractor (stripper) foil in the 11-MeV Siemens Eclipse Cyclotron is discussed in this paper. The main advantage of graphene is its high thermal conductivity compared to that of amorphous carbon films. Graphene also has significant mechanical strength. The lifetime of the graphene foils under proton bombardment exceeded 16,000μAh. Graphene-based stripper foils demonstrated a significant increase in the transmission factor (defined as the ratio of the beam current on the target to the beam current on the stripper foil), which was approximately 90%. Fabrication of the graphene-based foils is discussed. The pros and cons of using the graphene material as a stripper foil in cyclotrons are analyzed.

Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research