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Title: Optimization of 1 MeV RFQ accelerator parameters for 9Be(d,n)10B based pulsed neutron source
Authors: Singh, A K
Baskaran, R
Selvakumaran, T S
Rao Sista, V L S
Singh, P
Keywords: Neutron source;Linear accelerator;Radio frequency quadrupole;Beam simulation
Issue Date: Jan-2011
Publisher: NISCAIR-CSIR, India
Abstract: Compact radio frequency quadrupole (RFQ) LINAC based pulsed neutron source is being built using 9Be(d,n)10B reaction for neutron shielding experiments, activation analysis and standardizing the neutron measurement techniques. It consists of an ion source, low energy beam transport, 1 MeV RFQ accelerator and a Beryllium target. The results of optimization study on RFQ accelerator, operating at 352 MHz have been presented. The main constraint in the design of RFQ is its length which should be of the order of 1.2 m. This helps in the fabrication process and making the neutron source compact. The RFQ beam simulation has been carried out using LIDOS RFQ code. The beam simulations have been carried out with conventional as well as non-conventional approaches for normal Ekilp (~1.8) and higher Ekilp (~2.2) values. The effect of the higher and lower input beam energy and beam emittance on the RFQ length has been studied. The RFQ beam simulation has been finalized to accelerate 25 keV deuterium ions to a final energy of 1 MeV with the transmission efficiency of 95% and for RFQ length of 1.19 m (including front and end flanges). The effect of deviation of various RFQ input parameters from the optimized value on the transmission efficiency of RFQ is analyzed in the error analysis. The RFQ 2D vane shape is optimized for the Q-value of 9135 and normalized maximum electric field gradient of 12.8 MV/m on the axis of RFQ using SUPERFISH code. The maximum surface electric field obtained in SUPERFISH is 32.76MV/m (Ekilp ~1.78) which matches to the results of LIDOS beam simulation
Page(s): 13-20
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(01) [January 2011]

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