Design, development and characterization of tunable Permanent Magnet Quadrupole for Drift Tube Linac

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A stretch wire magnetometer is a versatile instrument and can be treated as the primary standard of magnetic qualification of accelerator magnets. Bhabha Atomic Research Centre has developed a Stretch wire magnetic measurement system to cater to the requirements of magnetic measurements on accelerator magnets. This bench also includes a vibrating wire system. The scheme used in this instrument for measurements of magnetic flux ensures drift compensations after each scan. This feature along with post-signal processing gives an accuracy of homogeneity measurements comparable to that of a rotating coil magnetometer. Unlike conventional stretch wire systems, wire moves in the r-z plane (along r-axis) at different azimuthal angles. This provides the opportunity for drift compensation at each scan. This has immensely enhanced the measurement accuracy of non-homogeneity of integral fields to less than 3 units. The same is cross-verified with a rotating coil system. The comparison between rotating coil and stretch wire is presented. The Paper gives the step-wise procedure for the measurement of key performance indicators of an accelerator magnet. This paper brings out salient features of the system along with design and calibration results.

Section: Uniformity Of Integral Strengthmentioning

confidence: 99%

Single Stretch Wire and vibrating wire measurement system for characterization of multipole accelerator magnets

Teotia

Malhotra

2023

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“…In contrast, other beam dynamics schemes [8] usually employ a synchronous phase around −30 • to bunch the beam, and the transverse focusing of the beam is achieved by the magnets installed inside the cavity. For instance, in the Alvarez type DTL, magnets are installed in DTs [9,10], which greatly increases the size and weight of the DTs and stems. As for the KONUS type DTL [11][12][13], quadrupoles are periodically arranged inside the tank, which increases the complexity of the DTL cavity.…”

Section: Alternating Phase Focusingmentioning

confidence: 99%

Beam dynamics and cavity design of an 8 MeV CW IH-DTL for SYSU-PAFA

Wang

et al. 2023

As a part of the Particle Accelerator Facility at Sun Yat-sen University (SYSU-PAFA), a 200 MHz drift tube linac (DTL), operating under continuous wave (CW) mode, has been designed. PAFA-DTL is expected to accelerate a 10 mA proton beam from 2.5 MeV to 8 MeV. Using the alternative phase focusing (APF) beam dynamics scheme, a compact cell array has been designed and optimized in order to limit the cavity length to 2.4 m with high acceleration efficiency. As a result, PAFA-DTL contains 31 acceleration cells with beam transmission efficiency reaches 100%, and better output beam quality is obtained by optimizing the input beam parameters. Interdigital H-mode (IH) structure is utilized in the PAFA-DTL cavity, which has achieved a high unloaded quality factor of 13987. Additionally, to ensure the stability of PAFA-DTL under CW operation, a low Kilpatrick factor (Kp) of 1.42 is obtained by adjusting the blending radius of the drift tubes (DTs) to reduce the risk of RF breakdown. The gap voltage distribution through RF design is compared with that from the beam dynamics, and the maximum absolute value of deviation is only 0.73%. In this paper, the detailed design and results of PAFA-DTL, including beam dynamics and RF design, are presented.

“…The design of permanent magnet Quadrupoles is given in [7]. The EM design of PMQ took care of the operating temperature, thermal stability, stability against demagnetizing fields, and irradiation effects [10][11][12][13].…”

Section: Magnetic Designmentioning

confidence: 99%

“…The DT houses the permanent magnet quadrupoles. The design of tunable permanent magnet quadrupoles is detailed in [7]. The requirement of fixed ∫ 𝐺𝑑𝑙 required the PMQs to be tunable.…”

Section: Introductionmentioning

confidence: 99%

“…They are housed inside hermetically sealed copper Drift Tubes. Owing to their numerous advantages, Sm 2 Co 17 rare earth permanent magnets are used [7,[9][10][11][12], The DTL is post-coupled for increasing the stability of the E-field with respect to perturbations [8]. Slug tuners are used for one-time correction of static offset in resonant frequency arising due to fabrication deviations [13].…”

Section: Introductionmentioning

confidence: 99%

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

Teotia,

Malhotra,

Kumar

et al. 2023

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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.