Design of a wideband HVDC reference divider

Hällström, Jari; Bergman, Anders; Dedeoğlu, Serkan; Elg, Alf‐Peter; Houtzager, E.; Lucas, W.; Merev, Ahmet; Meisner, Johann; Sardi, A.; Suomalainen, Esa-Pekka; Weber, Christian

doi:10.1109/cpem.2012.6250874

Cited by 11 publications

(14 citation statements)

References 3 publications

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“…The expanded measurement uncertainty for the modular divider, determined in a series of experiments in several configurations [1], is presented in Table IV.…”

Section: Intercomparison At Full Voltagementioning

confidence: 99%

“…The Caddock film resistors have been characterized to (−10 ± 4) µ / /kV. In the modular divider described in [1], this has an influence. However, in this reference divider with only three out 40 submodules using the Caddock resistors, the contribution is less than 0.8 µ / /kV and therefore negligible.…”

Section: Voltage Coefficientmentioning

confidence: 99%

“…Out of 40 modules, 37 modules are equipped with 25 pieces of the 10-M Vishay-Mann precision-wire-wound resistors and three modules are equipped with 10-M Caddock USF 370 precision resistors of the same type used in the design of a modular reference divider [1]. The capacitance of the polymethyl methacrylate (PMMA) center column support and stray capacitance to earth from the column form a parasitic capacitive divider that will put limitations in frequency response that is felt already in the millihertz range.…”

Section: A High-voltage Armmentioning

confidence: 99%

“…The full set of 40 modules needed to reach a nominal voltage of 1000 kV at 100 µA was realized by equipping three modules with the same resistor type used in the modular divider designed for the on-site application [1].…”

Section: Characterizationmentioning

confidence: 99%

“…This has recently been achieved by the design of a new modular reference divider for calibration of metering class HVDC dividers up to the highest transmission voltages in use world wide [1], [2], [9]. For accuracy class 0.2%, a reference system should have an uncertainty less than 0.02%.…”

Section: Introductionmentioning

confidence: 99%

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Traceability and Characterization of a 1000 kV HVDC Reference Divider

Elg

Bergman

Hällström

et al. 2015

IEEE Trans. Instrum. Meas.

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This paper presents the characterization of a resistive high-voltage dc (HVDC) reference divider and methods to establish traceability. The divider is designed for use as a laboratory reference for calibration of HVDC measuring systems up to 1000 kV. Targeting a measurement uncertainty of 20 µV/V at full voltage has put a focus on the temperature coefficients of the resistors, elimination of humidity dependence, and control of leakage currents in the high-voltage arm. A scale factor calibration against a 50 kV divider at 10 kV leads to an expanded uncertainty of 15 µV/V.

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“…The expanded measurement uncertainty for the modular divider, determined in a series of experiments in several configurations [1], is presented in Table IV.…”

Section: Intercomparison At Full Voltagementioning

confidence: 99%

Section: Voltage Coefficientmentioning

confidence: 99%

Section: A High-voltage Armmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Traceability and Characterization of a 1000 kV HVDC Reference Divider

Elg

Bergman

Hällström

et al. 2015

IEEE Trans. Instrum. Meas.

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An improved value for the hyperfine splitting of hydrogen-like²⁰⁹Bi⁸²⁺

Ullmann

Andelkovic

Dax

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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We report an improved measurement of the hyperfine splitting in hydrogen-like bismuth (209Bi82+) at the experimental storage ring ESR at GSI by laser spectroscopy on a coasting beam. Accuracy was improved by about an order of magnitude compared to the first observation in 1994. The most important improvement is an in situ high voltage measurement at the electron cooler (EC) platform with an accuracy at the 10 ppm level. Furthermore, the space charge effect of the EC current on the ion velocity was determined with two independent techniques that provided consistent results. The result of nm provides an important reference value for experiments testing bound-state quantum electrodynamics in the strong magnetic field regime by evaluating the specific difference between the splittings in the hydrogen-like and lithium-like ions.

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