Transcript IH structure

IH-structure
The second acceleration stage, the IH-structure accelerates 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