J. Heikkinen et al., BEAMLINE PULSING SYSTEM FOR CYCLOTRONS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 417(2-3), 1998, pp. 197-209
A beamline pulsing system for cyclotrons is presented. The function of
this system is to modify the structure of a cyclotron ion beam guided
to the desired research target by a beamline. In some in-beam experim
ents, an adjustment of the time structure of the beam is sometimes nee
ded. This kind of situation occurs if,for example, the life time of th
e target material is longer than the period corresponding to the beam
frequency. In this case, the frequency of the ion pulses hitting the t
arget is 10-21 MHz depending on the frequency of the acceleration volt
age. The adjustment of the ion beam pulse frequency is carried out by
a beamline deflector. Deflection is achieved by feeding a high-amplitu
de (10-15 kV) RF-signal between the deflection plates positioned into
the beamline. This signal is generated from the cyclotron reference si
gnal by frequency division, phase adjustment and amplification. Simula
tion and test results indicate that the specified deflection signal le
vel is achieved with 1 kW of RF-power. (C) 1998 Elsevier Science B.V.
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