Physics design of rod type proton Radio Frequency Quadrupole linac

Das, Chinmay; Dechoudhury, Siddhartha; Pandey, H.K.; Naik, Vaishali

doi:10.1088/1748-0221/12/02/t02005

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…Thus with external buncher, we get the rms longitudinal emittance at the RFQ exit to be 0.0369 π deg-MeV at 800 keV. As reported in reference [1] without any external buncher, for a beam of uniform distribution within ∆φ = ±120 deg and ∆W = ±1 keV around 60 keV the corresponding emittance is 0.041 π deg-MeV. For muon acceleration, a compact IH structure with alternative phase focusing scheme [15] has been designed.…”

Section: Tracking Of Charged Species Through Rfqmentioning

confidence: 78%

“…The RFQ should, thus be placed at 1.695 m from the ion source. The optimized magnetic field is 0.49 T. Figure 8 shows the transverse and longitudinal particle distribution of the tracked beam and the RFQ acceptance analyzed in reference [1]. Moreover using GPT we have calculated rms σ x /σ y for H + and H + 2 upto the slit position, while after the slit we have plotted the rms transverse and longitudinal beam size for the beam which are within ±120 deg at RFQ entry (shown in figure 9).…”

Section: Jinst 13 T10007mentioning

confidence: 99%

“…This would correspond to current of 7.88 mA. The 3D field of 3.44 m designed RFQ has already been simulated using CST [1]. In order to study the efficacy of the designed injection beam line, the proton beam has been tracked through the RFQ 3D field.…”

Section: Tracking Of Charged Species Through Rfqmentioning

confidence: 99%

“…The present paper deals with optimization and beam dynamics design of space charge dominated injection beam line from 60 keV Electron Cyclotron Resonance Ion Source (ECRIS) to a Radio Frequency Quadrupole (RFQ). The design of the 80 MHz rod type RFQ for accelerating proton beam of current 5 mA from 60 keV to 800 keV has already been reported [1]. This RFQ would act as the first injector of the final 50 MeV, 2 mA proton driver for the ANURIB project [2].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of space-charge dominated injection beam line of high current proton RFQ

2018

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Design of a space charge dominated proton beam-line from an ECR ion source to a high current RFQ has been carried out using analytical formulation. The parameters of the beam-line consisting of two solenoids, a slit for selecting H+ and rejecting H2+, and buncher are optimized to match the proton beam with the acceptance of RFQ . Analytical formulation for multispecies beam instead of conventional optical code has helped in simultaneously achieving different objectives within a compact but optimum length. Disc model having finite input energy width for longitudinal calculations and K-V transverse envelope equations for individual macro-discs including the bunching effect has been used. Selected parameters have been further corroborated by particle tracking using the 3D field of buncher and RFQ . Efficient selection/rejection of species has been verified with different type of input particle distributions in particle tracking. Finally the transmitted H+ and remaining H2+ has been tracked through the RFQ . The ratio of H+ to H2+, which is roughly 7:3 at exit of ECRIS could be reduced to 32:1 after the slit, while through RFQ remaining H2+ gets only transmitted but without any acceleration.

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Section: Tracking Of Charged Species Through Rfqmentioning

confidence: 78%

Section: Jinst 13 T10007mentioning

confidence: 99%

Section: Tracking Of Charged Species Through Rfqmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of space-charge dominated injection beam line of high current proton RFQ

2018

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Measurement of quadrupolar asymmetry in prototype rod-type radio frequency quadrupole linac for protons

Das

Dechoudhury

Mandi

et al. 2020

Review of Scientific Instruments

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An analytical and cold model study of a prototype extended vane rod-type RFQ (radio frequency quadrupole linac) is presented. The bead-pull measurement allowed us to experimentally determine the effect of shaping of the vane-supporting posts and, most interestingly, the size of the vacuum enclosure in the dipolar and quadrupolar field asymmetry. Disk shaped beads of BaTiO3 have been tailor made for this purpose. The special shape of the beads has allowed precise measurements of frequency shifts all along the length of the RFQ. The measured quadrupolar asymmetry and dipole component at a radial distance of 7 mm from the beam axis are within ±1% for the optimized structure. Particle tracking of a 10 mA proton beam with a simulated 3D field for the optimized full scale RFQ with modulated vanes has been carried out. Simulation shows vertical and horizontal shifts of only 0.01 mm and 0.03 mm, respectively, for the accelerated beam at the exit of RFQ. The percentage of accelerated particles lying within an energy width of ±40 keV about 800 keV is increased from 86% for the original enclosure to 88% for the reduced enclosure, whereas the transmission efficiency is 100% for both the cases.

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Theoretical and experimental studies of multi-port RF power feeding in rod-type radio frequency quadrupole (RFQ) linac

2022

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An analytical and experimental study of multi-port RF power feeding in a four rod-type radio frequency quadrupole (RFQ) has been discussed. First, we have derived generalized relations for multi-coupler power feeding based on S-parameters for n balanced couplers. Using simulation and measurements on a prototype, the optimum position and orientation of two and four couplers in an 80 MHz extended vane rod type RFQ have been determined. A low power RF test has been carried out to show the phase and power balancing using S parameter analysis for two and four mock-up couplers for the RFQ. As a corroborative study, the vane tip voltage measured with a vector voltmeter showed that voltage corresponding to power fed through a single coupler (β = 1) agrees with the value when the same power is fed using two or four couplers.

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Physics design of rod type proton Radio Frequency Quadrupole linac

Cited by 3 publications

References 21 publications

Optimization of space-charge dominated injection beam line of high current proton RFQ

Optimization of space-charge dominated injection beam line of high current proton RFQ

Measurement of quadrupolar asymmetry in prototype rod-type radio frequency quadrupole linac for protons

Theoretical and experimental studies of multi-port RF power feeding in rod-type radio frequency quadrupole (RFQ) linac

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