High accuracy current measurement in the main power converters of the large hadron collider: tutorial 53

Bastos, M. Cerqueira; Fernqvist, G.; Hudson, G.; Pett, J.; Cantone, A.; Power, F.; Saab, A.; Halvarsson, Bjorn; Pickering, J.

doi:10.1109/mim.2014.6783001

Cited by 17 publications

(8 citation statements)

References 9 publications

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“…Two different sensors have been used for continuous and event-driven data acquisition, respectively, as shown in Figure 5 . Closed Loop Direct Current Current Transformers (DCCT) (1) have been used to measure the DC/low frequency components of the beamlet current, while current transformers (2) have been used to measure the high-frequency components [ 21 , 22 ].…”

Section: Applicationsmentioning

confidence: 99%

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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Section: Applicationsmentioning

confidence: 99%

A Versatile Board for Event-Driven Data Acquisition

Manduchi,

Rigoni,

Trevisan

et al. 2024

Sensors

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show abstract

“…All but the last requirement is defined for isothermal conditions. The first two parameters do not refer only to the measurement system, but also to the capabilities of the digital controller and the calibration infrastructure that was put in place for the LHC [1], [9]. The specifications are further subdivided into guidelines for the DCCT and the ADC; in this case ppm refers to the rated output voltage of the DCCT, 10 V, which is also the nominal full-scale input voltage of the ADC (henceforth 1 ppm = 10 µV).…”

Section: Requirementsmentioning

confidence: 99%

“…high precision measurement chain that consists of direct current current transformers (DCCTs) and analog-to-digital converters (ADCs) [1]. A special ADC, the DS22 [2] was developed at CERN in the 1990s and deployed prior to the startup of the LHC in 2008.…”

mentioning

confidence: 99%

Design and Metrological Characterization of a Digitizer for the Highest Precision Magnet Powering in the High Luminosity Large Hadron Collider

Beev,

Bastos,

Martino

et al. 2024

IEEE Trans. Instrum. Meas.

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A new digitizer, the HPM7177, which is a fundamental component of the signal chain for high precision measurement of particle accelerator magnet currents, is presented. It was designed to meet the unprecedented performance requirements for new 14 kA and 18 kA power converters (PCs) for the High Luminosity Large Hadron Collider (HL-LHC) project at CERN, particularly in terms of low-frequency noise and stability. To determine accurately the performance of the digitizer, which is on a similar level as state-of-the-art classical metrological equipment, we carried out a thorough characterization using the programmable Josephson voltage standard (PJVS) at PTB-Braunschweig. At its nominal full scale of 10 V, the digitizer has a white noise level of <175 nV Hz −1/2 , 1/ f noise floor ≈7 × 10 −8 V, and a 12-h peak-to-peak stability better than 2 µV or 0.2 parts per million (ppm). The static non-linearity from 0 V to +10 V is <1 ppm and remains stable to ≈10 −7 level in 12 months. The digitizer operates at a fixed rate of 10 kSamples/s and can be synchronized externally. Besides qualifying HPM7177 for its application, the characterization reveals important aspects of its operation, as well as some performance limitations.

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“…High-precision current control for accelerator magnets [14], as a sub-field of scientific applications, is particularly demanding. The simultaneous requirements for stability, linearity, and resolution are high, since they all determine the overall control loop performance.…”

Section: Applicationsmentioning

confidence: 99%

Analog-to-digital conversion beyond 20 bits

Beev

2018

2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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Analog-to-digital converters with resolution exceeding 20 bits are widely available today. They exist in two forms-flexible laboratory instruments and monolithic integrated circuits. We present an overview of application fields for such digitizers, the hardware architectures that implement them, and their limitations. We review the state of the art by comparing the best-performing devices reported in scientific literature, as well as those available commercially. Our focus is particularly on integrated circuit solutions, and among our aims are the disambiguation of the multiple performance metrics in use, as well as the presentation of a clear perspective on basic performance tradeoffs. Finally, we provide a discussion on the future prospects for highresolution digitizing measurement systems.

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High accuracy current measurement in the main power converters of the large hadron collider: tutorial 53

Cited by 17 publications

References 9 publications

A Versatile Board for Event-Driven Data Acquisition

A Versatile Board for Event-Driven Data Acquisition

Design and Metrological Characterization of a Digitizer for the Highest Precision Magnet Powering in the High Luminosity Large Hadron Collider

Analog-to-digital conversion beyond 20 bits

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