Paper published in Applied Physics Letters
Non-interceptive beam profile monitors are highly desirable in almost all particle accelerators. Such techniques are especially valuable in applications where real time monitoring of the beam properties is required while beam preservation and minimal influence on the vacuum are of the greatest importance. This applies to many kinds of accelerators such as high energy machines where the normal diagnostics cannot withstand the beam's power, medical accelerators where treatment time is valuable and cannot be allocated to diagnostics and also low energy, low intensity accelerators where the beam's properties are difficult to measure.
In a paper that has just been published in Applied Physics Letters Vasilis Tzoganis et al. present proof-of-principle measurements with a gas-jet based beam profile monitor that was developed in the QUASAR Group.
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http://scitation.aip.org/content/aip/journal/apl/104/20/10.1063/1.4879285