A Metrology-grade Digitizer for Power Converters in the High Luminosity Large Hadron Collider

Beev, Nikolai; Bastos, M. Cerqueira; Martino, Michele; Valuch, Daniel

doi:10.1109/i2mtc48687.2022.9806573

Cited by 2 publications

(5 citation statements)

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“…The asymmetric shape of the non-linearity curve appears to be a feature of the ADC. Its positive section (0 V to +10 V referred to the digitizer input) has better unit-to-unit repeatability than the negative part (see [8,Fig. 4]).…”

Section: Linearitymentioning

confidence: 99%

“…Fig. 4, [8]) and specifications of the voltage reference [14] suggest that the target of 4 ppm/year should be easily reached once the devices pass the period of initial settling. In all prototype units tested so far, the same pattern of gain settling was observed, which is consistent with the settling of the ADR1000 voltage reference toward lower absolute values over a period of several months.…”

Section: H Long-term Stabilitymentioning

confidence: 99%

“…The effect of ambient temperature variations is mitigated by the use of temperature-stabilized racks for the Accuracy Class 0 systems, together with the very low temperature dependence of HPM7177. All prototypes tested so far had thermal drifts at least a factor of four below the target of 0.2 ppm/°C; the results for four units were reported in [8]. "Fill-to-fill repeatability" is likely to be affected by component aging, particularly in the period of initial settling of the voltage reference [14] and other components recovering from stresses induced by soldering and mechanical assembly.…”

Section: H Long-term Stabilitymentioning

confidence: 99%

“…Good EMI immunity is needed for this potentially noisy environment. Earlier results from electromagnetic compatibility tests showed low sensitivity to common disturbances, with reversible loss of measurement accuracy being the worst effect [8]. Further tests were carried out both at CERN and externally to ensure compliance with IEC/EN 61000 for emissions and susceptibility according to the levels specified for industrial environments.…”

Section: H Long-term Stabilitymentioning

confidence: 99%

“…This work, which is an extension of the IEEE I2MTC proceedings paper [8], presents the metrological characterization of the HPM7177 digitizer conducted using the programmable Josephson voltage standard (PJVS) at PTB-Braunschweig.…”

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confidence: 99%

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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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Section: Linearitymentioning

confidence: 99%

Section: H Long-term Stabilitymentioning

confidence: 99%

Section: H Long-term Stabilitymentioning

confidence: 99%

Section: H Long-term Stabilitymentioning

confidence: 99%

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confidence: 99%

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