Multipole correction of stretched-wire measurements of field-gradients in quadrupole accelerator magnets

Arpaïa, Pasquale; Buzio, Marco; Petrone, Carlo; Russenschuck, Stephan; Walckiers, L.

doi:10.1088/1748-0221/8/08/p08010

Cited by 13 publications

(6 citation statements)

References 13 publications

(19 reference statements)

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“…Table IV lists the integral field averaged from ramping the current up and down including the measurement precision given at 1σ performed on five repetitions. Due to the small effect of the multipoles, no correction is required on the gradient field measurement, see reference [9].…”

Section: B Magnetic Measurements Resultsmentioning

confidence: 99%

Performance of the Optimized Mechanical Design of the CLIC Main-Beam Quadrupole Magnet Prototype

Modena

Petrone

2020

IEEE Trans. Appl. Supercond.

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The Main-Beam Quadrupole (MBQ) magnets of CLIC, the Compact Linear Collider understudy at the CERN Laboratory in Geneva, are part of a critical magnet family, considering the industrial production challenges. An R&D program on the MBQ magnets was launched in 2010 for studying and investigating several assembly solutions in order to minimize the procurement cost of a large series of magnets comprising more than 4000 units. In this paper, the performance of the latest configuration is presented, comparing the results of magnetic measurements with previous magnet model variants. Innovative solutions for an efficient and fast fiducialization of the MBQ quadrupoles and alignment with respect to beam trajectory were also studied and developed inside the PACMAN Project, a CERN project supported by the European Union via the 7 th Framework Programme Marie Curie actions. The advantages of the mechanical design of the iron yoke and the assembly and alignment procedures are presented and discussed.

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Section: B Magnetic Measurements Resultsmentioning

confidence: 99%

Performance of the Optimized Mechanical Design of the CLIC Main-Beam Quadrupole Magnet Prototype

Modena

Petrone

2020

IEEE Trans. Appl. Supercond.

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“…In the literature [21][22][23], the typical requirements of magnetic field quality state that the amplitudes of the relative coefficients of the high order multipoles in magnets are:…”

Section: High Order Multipole Fieldsmentioning

confidence: 99%

Beam physics design of a 30-MW beam transport to the target for an accelerator-driven subcritical system

et al. 2022

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The Japan Atomic Energy Agency's accelerator-driven subcritical system (JAEA-ADS) proposes the reduction of nuclear waste through the transmutation of minor actinides. The JAEA-ADS drives a 30-MW proton beam to a spallation target to produce neutrons for a subcritical 800-MWth reactor. The beam must be transported from the end of the linear accelerator (linac) to the target located inside the reactor core with high beam power stability and low peak density to ensure beam window integrity, which is a primary concern for the ADS project. Additionally, the design of the beam transport to the target (BTT) must be compatible with the established reactor design, and the elements that comprise the BTT must facilitate the maintenance and replacement of the fuel and the beam window. To this end, a robust-compact BTT design was developed through massive multiparticle simulations. First, the beam optics was optimized to guarantee beam window feasibility requirements by providing a low peak density of less than 0.3 μA/mm2. Then, beam stability was evaluated and improved by a simultaneous application of input beam and element errors. The input beam errors were based on the beam degradation obtained by implementing fast fault compensation in the linac, which is a key strategy to attain high-reliability operation. The results show that the BTT design fulfills reactor and beam window requirements for JAEA-ADS.

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“…They guarantee more stable measurement performance with compensation for the main field component, easy calibration procedures, and additional information on the multipole field components. At CERN, for the Large Hadron Collider (LHC) [14], transducers based on fixed or rotating coils have been used as valid alternative to single-stretched wires [15] for integral field measurements and to intercept manufacturing defects by longitudinal scanning of straight magnets [16]. Wire-based systems [17] are used only for straight geometries and are not generally suited for local magnetic field measurements.…”

Section: Jinst 10 P06006mentioning

confidence: 99%

A rotating coil transducer for magnetic field mapping

et al. 2015

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A rotating coil transducer for local measurements of magnetic field quality in magnets is proposed. The transducer is based on (i) reduced-dimension rotating coils, as required e.g. for space charge computations, (ii) accurate transport, for longitudinal displacements inside the magnet aperture, and (iii) components with magnetic compatibility for negligible interference of the measurand field. This allows magnetic measurement requirements arisen from recently developed compact accelerator systems (with curvature radii of less than 5 m) for biomedical applications and physics research to be satisfied. In the paper, after presenting requirements and conceptual design, the architecture of the transducer is illustrated. Then, the experimental validation by tests of magnetic compatibility and rotation uniformity is reported. Finally, experimental results of repeatability, accuracy, and resolution in comparison with a reference system are discussed.

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Multipole correction of stretched-wire measurements of field-gradients in quadrupole accelerator magnets

Cited by 13 publications

References 13 publications

Performance of the Optimized Mechanical Design of the CLIC Main-Beam Quadrupole Magnet Prototype

Performance of the Optimized Mechanical Design of the CLIC Main-Beam Quadrupole Magnet Prototype

Beam physics design of a 30-MW beam transport to the target for an accelerator-driven subcritical system

A rotating coil transducer for magnetic field mapping

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