A New Method for Measurement of Proton Beam Energies
The absolute energy of an ion beam can be measured with the help of an electrostatic, a 180° magnetic or a velocity analyzer. Most commonly a 90° magnetic analyzer is used as a relative instrument that must be calibrated using the energies of certain known resonances or threshold energies. The deduced calibration parameters relate the proton beam energies to the field strength of the 90° magnetic analyzer. However, these parameters can change significantly with time and are critically dependent on the settings of the energy-defining input and output slits and the stabilizer of the accelerator. At any given time, a precise beam energy measurement requires one therefore to check the calibration parameters, a lengthy and inconvenient procedure. The present report describes a method which avoids these inconveniences and which determines the proton beam energy in a relatively short running period directly at any given value of interest to a precision of the order of 0.4 keV, using a Ge (Li) detector. This precision is well comparable with other techniques mentioned above.
KeywordsTarget Location Beam Energy Excitation Function Magnetic Analyzer Capture Reaction
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