Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

Penescu, Liviu; Catherall, R.; Lettry, J.; Stora, T.

doi:10.1063/1.3271245

Cited by 88 publications

(71 citation statements)

References 9 publications

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“…The ions of interest, 35 Ar, were produced by ∼2 μA of protons at 1.4 GeV from the proton synchrotron booster (PSB) impinging on a CaO micro-structured target connected to a versatile arc discharge ion source (VADIS) [33]. With a cold transfer line elements other than noble gases were suppressed.…”

Section: Methodsmentioning

confidence: 99%

“…After the acceptance of the paper the authors became aware of the publication of new results regarding the effects of scattering limiting the attainable precision in nuclear beta decay measurements with implanted sources [57][58][59], and of the production of intense [31][32][33][34][35] Ar beams with a nanostructured CaO target [60].…”

Section: Note Added In Proofsmentioning

confidence: 99%

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First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

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Abstract. The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the β + decay of 35 Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2 ns and position resolution of 0.1 mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. The number of recoil ions was measured for more than 15 different settings of the retardation potential, complemented by dedicated background and half-life measurements. Previously unidentified systematic effects, including an energy-dependent efficiency of the main MCP and a radiation-induced time-dependent background, have been identified and incorporated into the analysis. However, further understanding and treatment of the radiation-induced background requires additional dedicated measurements and remains the current limiting factor in extracting a betaneutrino angular correlation coefficient for 35 Ar decay using the WITCH spectrometer.

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Section: Methodsmentioning

confidence: 99%

Section: Note Added In Proofsmentioning

confidence: 99%

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

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“…Currently this approach makes use of a standard ISOLDE FEBIAD (the VADIS) ion source [44] as a laser-atom interaction volume, as seen in figure 6(b). When operating at low anode voltage (<10 V), and with optimized cathode and magnetic field settings, the FEBIAD cavity becomes an effective environment for selective laser resonance ionization.…”

Section: Hybrid Plasma-laser Ion Source: Vadlismentioning

confidence: 99%

Ion beam production and study of radioactive isotopes with the laser ion source at ISOLDE

Fedosseev

Wendt

Rothe

et al. 2017

J. Phys. G: Nucl. Part. Phys.

122

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Ion beam production and study of radioactive isotopes with the laser ion source at ISOLDE At ISOLDE the majority of radioactive ion beams are produced using the resonance ionization laser ion source (RILIS). This ion source is based on resonant excitation of atomic transitions by wavelength tunable laser radiation.Since its installation at the ISOLDE facility in 1994, the RILIS laser setup has been developed into a versatile remotely operated laser system comprising state-of-the-art solid state and dye lasers capable of generating multiple high quality laser beams at any wavelength in the range of 210-950 nm. A continuous programme of atomic ionization scheme development at CERN and at other laboratories has gradually increased the number of RILIS-ionized elements. At present, isotopes of 40 different elements have been selectively laser-ionized by the ISOLDE RILIS. Studies related to the optimization of the laser-atom interaction environment have yielded new laser ion source types: the laser ion source and trap and the versatile arc discharge and laser ion source. Depending on the specific experimental requirements for beam purity or versatility to switch between different ionization mechanisms, these may offer a favourable alternative to the standard hot metal cavity configuration. In addition to its main purpose of ion beam production, the RILIS is used for laser spectroscopy of radioisotopes. In an ongoing experimental campaign the isotope shifts and hyperfine structure of long isotopic chains have been measured by the extremely sensitive in-source laser spectroscopy method. The studies performed in the lead region were focused on nuclear deformation and Made open access 7 August 2017Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.shape coexistence effects around the closed proton shell Z = 82. The paper describes the functional principles of the RILIS, the current status of the laser system and demonstrated capabilities for the production of different ion beams including the high-resolution studies of short-lived isotopes and other applications of RILIS lasers for ISOLDE experiments.

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“…The radioactive 60-keV 31 Ar beam used in the experiment was produced at the ISOLDE facility at the European research organization CERN, using a CaO target and a versatile arc discharge plasma ion source [17] coupled to the General Purpose Separator (GPS) [18]. The beam is produced by irradiating the target with short high-intensity proton pulses at low repetition rate [18].…”

Section: The Experimentsmentioning

confidence: 99%

Relative proton andγwidths of astrophysically important states in30S studied in theβ-delayed decay of
Koldste
¹
,
Blank
²
,
Borge
³

et al. 2013
Phys. Rev. C

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Resonances just above the proton threshold in 30 S affect the 29 P(p, γ ) 30 S reaction under astrophysical conditions. The (p,γ )-reaction rate is currently determined indirectly and depends on the properties of the relevant resonances. We present here a method for finding the ratio between the proton and γ partial widths of resonances in 30 S. The widths are determined from the β2p-and βpγ -decay of 31 Ar, which is produced at the ISOLDE radioactive ion beam facility at the European research organization CERN. Experimental limits on the ratio between the proton and γ partial widths for astrophysical relevant levels in 30 S have been found for the first time. A level at 4689.2(24) keV is identified in the γ spectrum, and an upper limit on the p / γ ratio of 0.26 (95% C.L.) is found. In the two-proton spectrum two levels at 5227(3) keV and 5847(4) keV are identified. These levels were previously seen to γ decay and upper limits on the γ / p ratio of 0.5 and 9, respectively, (95% C.L.) are found, where the latter differs from previous calculations.

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Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

Cited by 88 publications

References 9 publications

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

Ion beam production and study of radioactive isotopes with the laser ion source at ISOLDE

Relative proton andγwidths of astrophysically important states in30S studied in theβ-delayed decay of
Koldste
¹
,
Blank
²
,
Borge
³

et al. 2013
Phys. Rev. C

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Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE

Cited by 88 publications

References 9 publications

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

Ion beam production and study of radioactive isotopes with the laser ion source at ISOLDE

Relative proton andγwidths of astrophysically important states in30S studied in theβ-delayed decay ofKoldste1, Blank2, Borge3 et al. 2013Phys. Rev. C

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Relative proton andγwidths of astrophysically important states in30S studied in theβ-delayed decay of
Koldste
¹
,
Blank
²
,
Borge
³

et al. 2013
Phys. Rev. C