High-voltage measurements on the 5 ppm relative uncertainty level with collinear laser spectroscopy

Krämer, Jörg; König, Kristian; Geppert, Ch.; Imgram, Phillip; Maaß, B.; Meisner, Johann; Otten, Ernst W.; Passon, Stephan; Ratajczyk, Tim; Ullmann, Johannes; Nörtershäuser, W.

doi:10.1088/1681-7575/aaabe0

Cited by 22 publications

(18 citation statements)

References 10 publications

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“…Unexpectedly, changes in the frequency discrepancy between comb and wavelength meter in the MHz regime were observed during this measurement. • Similar deviations have been observed during measurements at the collinear apparatus albeit without consequences for the experiments since they were conducted at a fixed frequency [19,20]. In these cases, the lasers were stabilized by wavelength meters but continuously measured with a comb.…”

Section: Introductionsupporting

confidence: 57%

On the performance of wavelength meters: Part 2—frequency-comb based characterization for more accurate absolute wavelength determinations

et al. 2020

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Wavelength meters are widely used for frequency determinations and stabilization purposes since they cover a large wavelength range, provide a high read-out rate and have specified accuracies of up to 10 −8 . More accurate optical frequency measurements can be achieved with frequency combs but only at the price of considerably higher costs and complexity. In the context of precise and accurate frequency determinations for high-resolution laser spectroscopy, the performance of five different wavelength meters was quantified with respect to a frequency comb. The relative precision as well as the absolute accuracy has been investigated in detail, allowing us to give a sophisticated uncertainty margin for the individual instruments. We encountered a prominent substructure on the deviation between both device types with an amplitude of a few MHz that is repeating on the GHz scale. This finally limits the precision of laser scans which are monitored and controlled with wavelength meters. While quantifying its uncertainty margins, we found a high temporal stability in the characteristics of the wavelength meters which enables the preparation of wavelength-dependent adjustment curves for wide-and short-ranged scans. With this method, the absolute accuracy of wavelength meters can be raised up to the MHz level independently from the wavelength of the reference laser used for calibrating the device. Since this technique can be universally applied, it can lead to benefits in all fields of wavelength meter applications.

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Section: Introductionsupporting

confidence: 57%

On the performance of wavelength meters: Part 2—frequency-comb based characterization for more accurate absolute wavelength determinations

et al. 2020

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“…In order to equip our collinear beamline COALA (COllinear Apparatus for Laser spectroscopy and Applied science) at TU Darmstadt [24][25][26] with a versatile ion source that will also serve the LASPEC experiment at FAIR [27], we are currently developing a laserablation ion source. The source is designed to reduce necessary DC fields to a minimum, but maintaining a high transport efficiency by He gas flow.…”

Section: Introductionmentioning

confidence: 99%

Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

et al. 2020

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Laser ablation opens a material-independent method to produce ions from transition metals for laser spectroscopy. To overcome some drawbacks of this process, an ion source is under development at TU Darmstadt. A distinctive feature of this source is that ions are produced via laser ablation in presence of helium buffer gas where they stop and cool in the process of their collisions with the buffer gas atoms and are then extracted by the gas flow into low-pressure conditions through the supersonic nozzle. The compact RF-only funnel ion guide placed on the axis behind the nozzle exit allows for effective extraction of highquality ion beams into a pressure region below 10 −4 mbar. The extraction is realized by using the gas flow trough a supersonic nozzle and an RF-only funnel ion guide, followed by a second nozzle and an RF+DC funnel representing two differential pumping stages. The technical details of this laser ablation ion source are described and the results of the first tests with the RF-only funnel are presented.

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“…The work functions of the source and spectrometer should be constant on the time scale of the measurements 4. With a very different technique[26], collinear laser spectroscopy on Doppler-shifted ions, an absolute high voltage calibration has been reported recently. This novel method profits from eliminating systematics by performing two measurements at two different Doppler-shifts similarly to the method reported here.…”

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confidence: 99%

Calibration of high voltages at the ppm level by the difference of $$^{83{\mathrm{m}}}$$Kr conversion electron lines at the KATRIN experiment

et al. 2018

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The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at − 18.6 kV of the main spectrometer. To monitor the stability, two custommade ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage dividers required bringing the equipment to the specialised metrology laboratory. Here we present a new method based on measuring the energy difference of two 83m Kr conversion electron lines with the KATRIN setup, which was demonstrated during KATRIN's commissioning measurements in July 2017. The measured scale factor M = 1972.449(10) of the highvoltage divider K35 is in agreement with the last PTB calibration 4 years ago. This result demonstrates the utility of the calibration method, as well as the long-term stability of the voltage divider.

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High-voltage measurements on the 5 ppm relative uncertainty level with collinear laser spectroscopy

Cited by 22 publications

References 10 publications

On the performance of wavelength meters: Part 2—frequency-comb based characterization for more accurate absolute wavelength determinations

On the performance of wavelength meters: Part 2—frequency-comb based characterization for more accurate absolute wavelength determinations

Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

Calibration of high voltages at the ppm level by the difference of $$^{83{\mathrm{m}}}$$Kr conversion electron lines at the KATRIN experiment

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