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IH-structure PowerPoint Presentation
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IH-structure

IH-structure

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IH-structure

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  1. IH-structure The second acceleration stage, the IH-structureaccelerates the ions from 0.3 MeV/u to an extraction energy between 1.1 and 1.2 MeV/u. The variation of the final energy of the IH-structure can be achieved by adjusting the gap voltage distribution via capacitive plungers. • Theory • Inside the resonator tank cylindrical cavity drift tubes of varying length (matching the ion velocity) are mounted alternating on opposite sides. The magnetic field lines are parallel to the beam axis and the induced currents flow azimuthally on the wall, creating electric fields of alternating direction between the drift tubes. This field forces the ions forward. end view side view • Matching section • To match the beam into the acceptances of the IH-structure a section consisting of two magnetic quadrupole triplet lenses and a rebuncher is required. The rebuncher is a two gap spiral resonator. • IH-structure data • Energy Ein = 300 keV/u, Eout = 1.1-1.2 MeV/u • Electrode voltage Veff = 4.05 MV • Tank length L = 1.5 m • Number of gaps = 20 • Peak power consumption Wpeak = 36 kW