First characterization of the SPIDER beam AC component with the Beamlet Current Monitor

Duteil, Basile Pouradier; Shepherd, A.; Patton, T.; Garola, Andrea Rigoni; Casagrande, Riccardo

doi:10.1016/j.fusengdes.2023.113529

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…The first feature perm The BCMs were used to perform an in-depth characterization of the AC component of the SPIDER beam during the first campaign with cesium evaporation. Recurring oscillations were found, their amplitudes were measured and compared to the DC values of the beamlet currents and the frequencies were correlated with those of the RF oscillators and other power supplies when possible [35].…”

Section: Discussionmentioning

confidence: 99%

Design and Development of a Diagnostic System for a Non-Intercepting Direct Measure of the SPIDER Ion Source Beamlet Current

Patton¹,

Shepherd

Duteil

et al. 2023

Sensors

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Stable and uniform beams with low divergence are required in particle accelerators; therefore, beyond the accelerated current, measuring the beam current spatial uniformity and stability over time is necessary to assess the beam performance, since these parameters affect the perveance and thus the beam optics. For high-power beams operating with long pulses, it is convenient to directly measure these current parameters with a non-intercepting system due to the heat management requirement. Such a system needs to be capable of operating in a vacuum in the presence of strong electromagnetic fields and overvoltages, due to electrical breakdowns in the accelerator. Finally, the measure of the beam current needs to be efficiently integrated into a pulse file with the other relevant plant parameters to allow the data analyses required for beam optimization. This paper describes the development, design and commissioning of such a non-intercepting system, the so-called beamlet current monitor (BCM), aimed to directly measure the electric current of a particle beam. In particular, the layout of the system was adapted to the SPIDER experiment, the ion source (IS) prototype of the heating neutral beam injectors (HNB) for the ITER fusion reactor. The diagnostic is suitable to provide the electric current of five beamlets from DC up to 10 MHz.

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Section: Discussionmentioning

confidence: 99%

Design and Development of a Diagnostic System for a Non-Intercepting Direct Measure of the SPIDER Ion Source Beamlet Current

Patton¹,

Shepherd

Duteil

et al. 2023

Sensors

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“…aperture and uses a combination of fluxgate (DC) and current transformer (AC) technologies to measure the beamlet current using the resultant magnetic flux. These sensors measure the current of five beamlets, from DC to several MHz AC [12][13][14].…”

Section: Jinst 18 C07019mentioning

confidence: 99%

Direct current measurements of the SPIDER beam: a comparison to existing beam diagnostics

Shepherd,

Patton,

Pimazzoni

et al. 2023

J. Inst.

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For negative ion beam sources there are several methods of measuring the accelerated beam current, most commonly electrical measurements at the power supply and calorimetric measurements. On SPIDER, the ITER Heating Neutral Beam full-scale beam source prototype, electrical measurements at the acceleration grid power supply (AGPS) are complemented by polarizing the diagnostic calorimeter STRIKE to provide an additional electrical measurement of the accelerated current. This is in addition to the calorimetric measurements provided by STRIKE. These diagnostics give differing measurements of the beam current. Exploiting the reduced number of open apertures on SPIDER a new beam diagnostic has been installed to measure the individual beamlet currents directly. The so called Beamlet Current Monitor (BCM) has been used to measure the current of five beamlets during the most recent SPIDER campaign. This work compares the BCM current to the electrical measurements at the AGPS and STRIKE. The average BCM current agrees well with the STRIKE electrical measurements, indicating that the AGPS overestimates the beam current. The individual beamlets are compared to the STRIKE calorimetric measurements, showing similar current trends with the source parameters.

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“…The ions are extracted from the Ion Source (biased by the AGPS power supply with respect to ground) by the Extraction Grid, which Beamlet currents in different positions have been measured using two different configurations of the RP board. Continuous data acquisition provides information about the average current density and uniformity [18], whereas the event-driven acquisition provides information about the beam current fluctuations (MHz range) due to the plasma oscillations produced by the RF field generating the plasma [19,20]. Two different sensors have been used for continuous and event-driven data acquisition, respectively, as shown in Figure 5.…”

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confidence: 99%

“…Other applications concerning the FAST acquisition mode are shown i Finally, the internal assembly of the data acquisition module is show where the layout of the six RP boards also assures high insulation capabilit case) among the channels. Other applications concerning the FAST acquisition mode are shown in detail in [20]. Finally, the internal assembly of the data acquisition module is shown in Figure 8, where the layout of the six RP boards also assures high insulation capability (5 kV for this case) among the channels.…”

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A Versatile Board for Event-Driven Data Acquisition

Manduchi,

Rigoni,

Trevisan

et al. 2024

Sensors

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Event-driven data acquisition is used to capture information from fast transient phenomena typically requiring a high sampling speed. This is an important requirement in the ITER Neutral Beam Test Facility for the development of one of the heating systems of the ITER nuclear fusion experiment. The Red Pitaya board has been chosen for this project because of its versatility and low cost. Versatility is provided by the hosted Zynq System on Chip (SoC), which allows full configuration of the module architecture and the OpenSource architecture of Red Pitaya. Price is an important factor, because the boards are installed in a hostile environment where devices can be damaged by EMI and radiation. A flexible solution for event-driven data acquisition has been developed in the Zynq SoC and interfaced to the Linux-based embedded ARM processor. It has been successfully adopted in a variety of data acquisition applications in the test facility.

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First characterization of the SPIDER beam AC component with the Beamlet Current Monitor

Cited by 4 publications

References 16 publications

Design and Development of a Diagnostic System for a Non-Intercepting Direct Measure of the SPIDER Ion Source Beamlet Current

Design and Development of a Diagnostic System for a Non-Intercepting Direct Measure of the SPIDER Ion Source Beamlet Current

Direct current measurements of the SPIDER beam: a comparison to existing beam diagnostics

A Versatile Board for Event-Driven Data Acquisition

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