Updating the CSNS injector linac to 250 MeV with superconducting double-spoke cavities

LI Zhi-Hui; FU Shi-Nian

doi:10.1088/1674-1137/39/3/037004

Chinese Physics C> 2015, Vol. 39> Issue(3) : 037004 DOI: 10.1088/1674-1137/39/3/037004

Updating the CSNS injector linac to 250 MeV with superconducting double-spoke cavities

LI Zhi-Hui ^, ,
FU Shi-Nian

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Abstract：
In order to update the beam power from 100 kW to 500 kW in the China Spallation neutron source (CSNS) Phase Ⅱ, one of the important measures is to replace the 80 long beam transport line between the present 80 MeV linac injector and the rapid cycling synchrotron (RCS) to another kind of acceleration structure. In this paper, we proposed a scheme based on 324 MHz double-spoke superconducting cavities. Unlike the superconducting elliptical cavity and normal conducting coupled cavity linac (CCL) structure, the double-spoke cavity belongs to the TE mode structure and has a smaller transverse dimension compared with that of the TH mode one. It can work at base frequency as the drift tube Linac (DTL) section, so that the cost and complexity of the RF system will be much decreased, and the behaviors of the beam dynamics are also improved significantly because of the low charge density and larger longitudinal acceptance. Furthermore, because of the relatively longer interactive length between the charged particle and the electromagnetic field per cell, it needs relatively less cell numbers and it has larger velocity acceptance compared with the double frequency TH structures. The superconducting section consists of 14 periods, each of which includes 3 superconducting cavities encapsulated in one cryomodule and a doublet in room temperate. The general considerations on cavity and beam dynamics design are discussed and the main results are presented.

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LI Zhi-Hui and FU Shi-Nian. Updating the CSNS injector linac to 250 MeV with superconducting double-spoke cavities[J]. Chinese Physics C, 2015, 39(3): 037004. doi: 10.1088/1674-1137/39/3/037004

LI Zhi-Hui and FU Shi-Nian. Updating the CSNS injector linac to 250 MeV with superconducting double-spoke cavities[J]. Chinese Physics C, 2015, 39(3): 037004. doi: 10.1088/1674-1137/39/3/037004 shu

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Received: 2014-05-04
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Updating the CSNS injector linac to 250 MeV with superconducting double-spoke cavities

LI Zhi-Hui ^,
FU Shi-Nian

Corresponding author: LI Zhi-Hui,

Received Date: 2014-05-04
Accepted Date: 1900-01-01
Available Online: 2015-03-05

Abstract: In order to update the beam power from 100 kW to 500 kW in the China Spallation neutron source (CSNS) Phase Ⅱ, one of the important measures is to replace the 80 long beam transport line between the present 80 MeV linac injector and the rapid cycling synchrotron (RCS) to another kind of acceleration structure. In this paper, we proposed a scheme based on 324 MHz double-spoke superconducting cavities. Unlike the superconducting elliptical cavity and normal conducting coupled cavity linac (CCL) structure, the double-spoke cavity belongs to the TE mode structure and has a smaller transverse dimension compared with that of the TH mode one. It can work at base frequency as the drift tube Linac (DTL) section, so that the cost and complexity of the RF system will be much decreased, and the behaviors of the beam dynamics are also improved significantly because of the low charge density and larger longitudinal acceptance. Furthermore, because of the relatively longer interactive length between the charged particle and the electromagnetic field per cell, it needs relatively less cell numbers and it has larger velocity acceptance compared with the double frequency TH structures. The superconducting section consists of 14 periods, each of which includes 3 superconducting cavities encapsulated in one cryomodule and a doublet in room temperate. The general considerations on cavity and beam dynamics design are discussed and the main results are presented.