Design of magnet and control of the beam emittance for Penning H<SUP>－</SUP> ion source

OUYANG Hua-Fu; ZHANG Hua-Shun

doi:10.1088/1674-1137/32/8/017

Chinese Physics C> 2008, Vol. 32> Issue(8) : 668-672 DOI: 10.1088/1674-1137/32/8/017

Design of magnet and control of the beam emittance for Penning H^－ ion source

OUYANG Hua-Fu ^, ,
ZHANG Hua-Shun

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Abstract：

The design requirement and principle of the deflection magnet for Magnetron and Penning H^－ ion source are discussed. It is proved that there exists a maximum emittance for the beam that may be transformed by the magnet into a state with equal Twiss parameters of α_r=α_y and β_r=β_y, which is the requisite condition to get a minimum emittance at the entrance of RFQ after transporting by a LEBT with solenoids. For this maximum emittance, the corresponding magnetic field gradient index is 1.

References

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. ZHANG H S. Ion Sources. Beijing: Sicence Press, and Springer-Verlag Berlin Heidelberg, 19992. Thomason J W G, Faircloth D C et al. Proc. of EPAC 2004.1458-14603. Planner C W. Particle Accelerators, 1995, 48: 243-2504. LI J H, TANG J Y, Nucl. Instrum. Methods A, 2007, 574:221-2255. Reiser M. Theory and Design of Charged Particle Beams.John Wiley Sons Inc., 19946. Jolly S, Pozimski J et al. Proc. of EPAC 2006. 1714-17167. Letchford A P. Proc. of EPAC 2002. 927-9298. Brown K L, Servranckx R V. First- and Second-order Charged Particle Optics. Ed. Month M, Dahl P F et al.Physics of High Energy Particle Accelerators, AIP Confer-ence Proceedings. 127, 64-138

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OUYANG Hua-Fu and ZHANG Hua-Shun. Design of magnet and control of the beam emittance for Penning H^－ ion source[J]. Chinese Physics C, 2008, 32(8): 668-672. doi: 10.1088/1674-1137/32/8/017

OUYANG Hua-Fu and ZHANG Hua-Shun. Design of magnet and control of the beam emittance for Penning H^－ ion source[J]. Chinese Physics C, 2008, 32(8): 668-672. doi: 10.1088/1674-1137/32/8/017 shu

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Received: 2007-10-08
Revised: 2007-10-17

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Design of magnet and control of the beam emittance for Penning H^－ ion source

OUYANG Hua-Fu ^,
ZHANG Hua-Shun

Corresponding author: OUYANG Hua-Fu,

Received Date: 2007-10-08
Accepted Date: 2007-10-17
Available Online: 2008-08-05

Abstract:

The design requirement and principle of the deflection magnet for Magnetron and Penning H^－ ion source are discussed. It is proved that there exists a maximum emittance for the beam that may be transformed by the magnet into a state with equal Twiss parameters of α_r=α_y and β_r=β_y, which is the requisite condition to get a minimum emittance at the entrance of RFQ after transporting by a LEBT with solenoids. For this maximum emittance, the corresponding magnetic field gradient index is 1.