0000000000383086

AUTHOR

R.c.a. Thompson

showing 3 related works from this author

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

2015

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 t…

Physicschemistry.chemical_elementElectronCondensed Matter PhysicsSpace chargeAtomic and Molecular Physics and OpticsMagnetic fieldBismuthIonchemistryAtomic physicsSpectroscopyHyperfine structureOrder of magnitudeJournal of Physics B: Atomic, Molecular and Optical Physics
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Hyperfine transition in209Bi80+—one step forward

2015

The hyperfine transitions in lithium-like and hydrogen-like bismuth were remeasured by direct laser spectroscopy at the experimental storage ring. For this we have now employed a voltage divider which enabled us to monitor the electron cooler voltage in situ. This will improve the experimental accuracy by about one order of magnitude with respect to our previous measurement using the same technique.

Materials scienceVoltage dividerchemistry.chemical_elementElectronCondensed Matter PhysicsAtomic and Molecular Physics and OpticsBismuthchemistryPhysics::Atomic PhysicsAtomic physicsNuclear ExperimentSpectroscopyHyperfine structureMathematical PhysicsStorage ringOrder of magnitudeVoltagePhysica Scripta
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HITRAP – a facility for experiments on heavy highly charged ions and on antiprotons

2009

HITRAP is a facility for very slow highly-charged heavy ions at GSI. HITRAP uses the GSI relativistic ion beams, the Experimental Storage Ring ESR for electron cooling and deceleration to 4 MeV/u, and consists of a combination of an interdigital H-mode (IH) structure with a radiofrequency quadrupole structure for further deceleration to 6 keV/u, and a Penning trap for accumulation and cooling to low temperatures. Finally, ion beams with low emittance will be delivered to a large variety of atomic and nuclear physics experiments. Presently, HITRAP is in the commissioning phase. The deceleration of heavy-ion beam from the ESR storage ring to an energy of 500 keV/u with the IH structure has be…

PhysicsHistoryLow emittancePenning trapComputer Science ApplicationsEducationIonlaw.inventionNuclear physicslawAntiprotonQuadrupolePhysics::Accelerator PhysicsPhysics::Atomic PhysicsAtomic physicsNuclear ExperimentBeam (structure)Storage ringElectron coolingJournal of Physics: Conference Series
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