Abstract
Sheet beam transport through closed periodic cusped magnet has been analysed. On the basis of analysis, closed PCM is designed to transport elliptical sheet beam of size 30 mm (width)×1.2 mm (thickness), beam voltage 120 kV, current density 600 A/cm2. This beam is selected for 30 GHz high power sheet beam klystron which has potential application for high gradient LINAC. Selection of aspect ratio of magnetic tunnel and magnetic period is the critical aspect. When aspect ratio of magnetic period is 4:1 and magnetic period is 10 mm, horizontal magnetic force profile matches nearly with horizontal space charge field profile. However, to get desired peak value of magnetic field is very critical. When magnetic period is 10 mm, cross-sectional size of magnetic tunnel is 42.4 mm (width) ×10.6 mm (height), axial thickness of each magnets is 4.2 mm, transverse thickness is 20 mm, the simulated value of magnetic field is 720 G. Above sheet beam with current density 100 A/cm2 transports up to 120 mm distance through this magnetic tunnel without any instability.
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