Electromagnetic and beam dynamics studies of a high current drift tube linac for LEHIPA

Roy, Shweta; Rao, S.V.L.S.; Pande, Rajni; Krishnagopal, S.; Singh, Pitamber

doi:10.1088/1748-0221/9/06/p06007

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…Using Superfish code from LANL, U.S.A. [24], 2D electromagnetic design optimizations are carried out for determining the DT width, nose angle, DT pitch, and PMQ ∫ 𝐺𝑑𝑙 by [26,27]. Figure 3 and figure 4 show the Superfish simulation results for DTL3 and DTL4 respectively [27].…”

Section: Beam Physics and 2d Em Designmentioning

confidence: 99%

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

Teotia,

Malhotra,

Kumar

et al. 2023

J. Inst.

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Bhabha Atomic Research Centre is developing Low Energy High Intensity Proton Accelerator (LEHIPA) as a pre-injector for proposed Accelerator Driven Sub-Critical Reactor Systems (ADSS). Drift Tube Linac is one of the two major accelerating structures of LEHIPA, the other being the Radio Frequency Quadrupole (RFQ). Like all particle accelerating structures, DTL needs multi-disciplinary expertise for design, production, qualification, and installation. This paper describes the comprehensive design, production, qualification, and installation of the ∼ 11–20 MeV section of DTL. It details the design of all sub-components which form part of the DTL RF cavity. Several novel concepts were implemented in course of this development. Important among them are DT-DTL alignment, referencing methodology, robust vacuum design and hermetically sealed DTs. This paper is a comprehensive coverage of design, development and installation aspects of Alvarez DTL. At present, the DTL is ready for beam commissioning.

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Section: Beam Physics and 2d Em Designmentioning

confidence: 99%

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

Teotia,

Malhotra,

Kumar

et al. 2023

J. Inst.

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“…This linac will consist of an ECR ion source which will provide 30 mA proton beam at 50 keV. This beam is then accelerated to 3 MeV using a four vane RFQ [3] and further to 20 MeV using an Alvarez DTL [4]. The two transport lines, Low Energy Beam Transport (LEBT) and Medium Energy Beam Transport (MEBT) will be used to match and transport the beam from the ion source to the RFQ and from the RFQ to the DTL respectively.…”

Section: Introductionmentioning

confidence: 99%

Optimization of solenoid based low energy beam transport line for high current H⁺beams

et al. 2015

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A 20 MeV, 30 mA CW proton linac is being developed at BARC, Mumbai. This linac will consist of an ECR ion source followed by a Radio Frequency Quadrupole (RFQ) and Drift tube Linac (DTL). The low energy beam transport (LEBT) line is used to match the beam from the ion source to the RFQ with minimum beam loss and increase in emittance. The LEBT is also used to eliminate the unwanted ions like H + 2 and H + 3 from entering the RFQ. In addition, space charge compensation is required for transportation of such high beam currents. All this requires careful design and optimization. Detailed beam dynamics simulations have been done to optimize the design of the LEBT using the Particle-in-cell code TRACEWIN. We find that with careful optimization it is possible to transport a 30 mA CW proton beam through the LEBT with 100% transmission and minimal emittance blow up, while at the same time suppressing unwanted species H + 2 and H + 3 to less than 3.3% of the total beam current.

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“…The core excitation energy becomes available for resonant build up of single particle oscillation. In the present paper we study the evolution of mismatch oscillation of beam core, and a consequent increase in emittance and halo growth in Low Energy High Intensity Proton Accelerator (LEHIPA) DTL [16].…”

Section: Introductionmentioning

confidence: 99%

Beam halo studies in LEHIPA DTL

Roy¹,

Pande²,

Rao³

et al. 2015

J. Inst.

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The Low Energy High Intensity Proton Accelerator (LEHIPA) project at Bhabha Atomic Research Centre (BARC) consists of a 20 MeV, 30 mA proton linac. The accelerator comprises of a 3 MeV Radio Frequency Quadrupole (RFQ) and a 20 MeV Drift Tube Linac (DTL). In such high intensity accelerators, beam halos are of concern as they not only cause an increase in emittance, but also lead to beam loss and radio activation. We have studied the effect of beam mismatch at the DTL input on halo formation and propagation. The particle core model is used to excite the three envelope eigen modes; the quadrupole mode, the fast mode and the slow mode by giving input beam mismatch. These modes get damped as the beam progresses through the DTL. The damping mechanism is clearly Landau damping and leads to increase in rms emittance of the beam. The evolution of these modes and the corresponding increase in beam emittance and maximum beam extent, as the beam propagates through the DTL, has been studied for different space charge tunes. The halo parameter based on the definition of Allen and Wangler has been calculated. It is seen that beam halos are very important for LEHIPA DTL, even at 20 MeV and leads to emittance and beam size increase and also to beam loss in some cases. The longitudinal halo is present even without mismatch and transverse halos arise in the presence of beam mismatch.

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Electromagnetic and beam dynamics studies of a high current drift tube linac for LEHIPA

Cited by 6 publications

References 22 publications

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

Optimization of solenoid based low energy beam transport line for high current H⁺beams

Beam halo studies in LEHIPA DTL

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Electromagnetic and beam dynamics studies of a high current drift tube linac for LEHIPA

Cited by 6 publications

References 22 publications

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

Optimization of solenoid based low energy beam transport line for high current H+beams

Beam halo studies in LEHIPA DTL

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Optimization of solenoid based low energy beam transport line for high current H⁺beams