Beam diagnostics and emittance measurement of H− multicusp ion source
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An H− multicusp ion source has been designed and constructed for CYCLONE30 commercial cyclotron. The emittance is an important physical parameter for the beam from the ion source. Moreover, there are many methods to measure the emittance of a beam in x–x′ and y–y′ planes. A wire scanner was designed and constructed to measure the emitted proton beam profiles and its specifications in both the transverse and longitudinal phase space.
A new ion source has been constructed already. Since this source will be used in cyclotron accelerator injection system, emittance is one of the important beam specifications. Our aim in this paper is to find a way and construct an instrument to measure this parameter.
Methods and materials
A cubic aluminum box with 15 cm length and width and 35 cm height is constructed. This profile monitor system is based on placing two separate isolated 0.6-mm-thick and 80-mm-long copper wires that are mounted installed in the path of the beam for scanning it in the both x- and y-directions. The wires can be moved in and out of the beam remotely with a pair of step-motor-operated pistons through a vacuum feedthrough attached to the flange and connected to the current monitor system.
An emittance measurement of the filament H− ion source has been performed with an electrical wire scanner. The measured rms beam emittance is concluded to be 0.38 π mm mrad for 5 mA H− beam of multicusp ion source.
KeywordsBeam diagnostic Multicusp ion source Wire scanner Emittance measurement
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