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Beam dynamics and electromagnetic studies of a 3 MeV, 325 MHz radio frequency quadrupole accelerator

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We present the beam dynamics and electromagnetic studies of a 3 MeV, 325 MHz H radio frequency quadrupole (RFQ) accelerator for the proposed Indian Spallation Neutron Source project. We have followed a design approach, where the emittance growth and the losses are minimized by keeping the tune depression ratio larger than 0.5. | Beam dynamics and electromagnetic studies of a 3 MeV 325 MHz radio frequency quadrupole accelerator EPJ Nuclear Sci. Technol. 4 9 2018 Nuclear Sciences R. Gaur and V. Kumar published by EDP Sciences 2018 amp Technologies https doi.org 10.1051 epjn 2018004 Available online at https www.epj-n.org REGULAR ARTICLE Beam dynamics and electromagnetic studies of a 3 MeV 325 MHz radio frequency quadrupole accelerator Rahul Gaur1 2 and Vinit Kumar1 2 1 Homi Bhabha National Institute Mumbai 400094 India 2 Raja Ramanna Centre for Advanced Technology Indore 452013 India Received 27 June 2017 Received in final form 16 December 2017 Accepted 1 March 2018 Abstract. We present the beam dynamics and electromagnetic studies of a 3 MeV 325 MHz H radio frequency quadrupole RFQ accelerator for the proposed Indian Spallation Neutron Source project. We have followed a design approach where the emittance growth and the losses are minimized by keeping the tune depression ratio larger than 0.5. The transverse cross-section of RFQ is designed at a frequency lower than the operating frequency so that the tuners have their nominal position inside the RFQ cavity. This has resulted in an improvement of the tuning range and the efficiency of tuners to correct the field errors in the RFQ. The vane-tip modulations have been modelled in CST- MWS code and its effect on the field flatness and the resonant frequency has been studied. The deterioration in the field flatness due to vane-tip modulations is reduced to an acceptable level with the help of tuners. Details of the error study and the higher order mode study along with mode stabilization technique are also described in the paper. 1 Introduction larger size of the accelerating structure in the case of lower frequency option could be an advantage for CW machines Since its invention in 1970 1 and first demonstration in from the cooling point of view due to lower power density 1974 at the USSR Institute for High Energy Physics in at the surface. This is .