A highly selective laser ion source for bunched, low emittance beam release

Wendt, Κ.; Blaum, Klaus; Brück, K.; Geppert, Ch.; Kluge, H.‐J.; Mukherjee, Monika; Passler, G.; Schwarz, S.; Sirotzki, S.; Wies, K.

doi:10.1016/j.nuclphysa.2004.09.067

Cited by 17 publications

(7 citation statements)

References 7 publications

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“…The approach taken with the TRIUMF RFQ/laser ion source is to substitute the "hot" surface ionizer tube by a "cold" radiofrequency quadrupole as done in some LIST [8,9]. Figure 2 shows the modification to the existing standard laser ion source.…”

Section: The Radiofrequency Quadrupole and Removal Of Beam Contaminantsmentioning

confidence: 99%

“…The dominant characteristic of these devices is the use of alternating electric quadrupole fields providing radial confinement of charged particles traveling down the RFQ axis. A widely used configuration consist of segmenting the RFQ rods in multiple sections [1][2][3][4][5][6][7][8][9][10][11]. This allows not only for axial confinement via application of DC fields on the segments but also for operation in either continuous or bunched mode.…”

Section: Introductionmentioning

confidence: 99%

“…The project described here consists of combining the characteristics of a segmented linear RFQ used as ion guide with the TRIUMF resonant-ionization laser ion source (TRILIS) in order to obtain ion beams of high-intensity and high-purity. Such configuration, as proposed and built for use at other facilities is referred to as laser ion source trap (LIST) [8][9][10][11]. The TRIUMF RFQ/laser ion source does not constitute a LIST since the RFQ is strictly used as an ion guide and does not permit cooling, bunching or trapping of charged particles.…”

Section: Introductionmentioning

confidence: 99%

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Segmented linear radiofrequency quadrupole/laser ion source project at TRIUMF

et al. 2007

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Reactions such as 25 Al(p,γ ) 26 Si are the key to understand the production of 26g Al and 26m Al in our galaxy. Experimental results could provide important constraints on nova nucleosynthesis and modelling where 26 Al is believed to be produced. To achieve such measurements, high-intensity and high-purity radioactive beams are required. However, production targets at ISOL-type facilities such as ISAC at TRIUMF produce high-intensity alkali beams by surface ionization on hot transfer tubes hampering the measurement of isotopes of interest. To overcome this issue, an ion source combining a segmented linear radiofrequency quadrupole (RFQ) to a laser ion source is being built. Its main function is to suppress alkali impurities whilst allowing for fast-release of short-lived isotopes. The beam production method, the RFQ/laser ion source and the removal of alkali contaminants are discussed in this paper.

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Section: The Radiofrequency Quadrupole and Removal Of Beam Contaminantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Segmented linear radiofrequency quadrupole/laser ion source project at TRIUMF

et al. 2007

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“…It geometrically decouples the volume where the laser ionization takes place from where other ionization mechanisms occur. The LIST technology, proposed first in 2003 [24], was predominantly developed at the Johannes Gutenberg-Universität Mainz, consecutively undergoing a number of adaptations to match conditions and operation at on-line facilities [25,26]. In a slightly modified version using a sextupole structure, it was also applied to a laser ion source coupled with a gas catcher, first at the LISOL setup of the Cyclotron Research Centre (Louvain-La-Neuve, Belgium) [27] and more recently at the IGISOL facility of the University of Jyväskylä (Finland) [28,29].…”

Section: Introductionmentioning

confidence: 99%

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

Fink¹,

Cocolios²,

Andreyev³

et al. 2015

Phys. Rev. X

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A Laser Ion Source and Trap (LIST) for a thick-target, isotope-separation on-line facility has been implemented at CERN ISOLDE for the production of pure, laser-ionized, radioactive ion beams. It offers two modes of operation, either as an ion guide, which performs similarly to the standard ISOLDE resonance ionization laser ion source (RILIS), or as a more selective ion source, where surface-ionized ions from the hot ion-source cavity are repelled by an electrode, while laser ionization is done within a radiofrequency quadrupole ion guide. The first physics application of the LIST enables the suppression of francium contamination in ion beams of neutron-rich polonium isotopes at ISOLDE by more than 1000 with a reduction in laser-ionization efficiency of only 20. Resonance ionization spectroscopy is performed directly inside the LIST device, allowing the study of the hyperfine structure and isotope shift of 217 Po for the first time. Nuclear decay spectroscopy of 219 Po is performed for the first time, revealing its half-life, α-to-β-decay branching ratio, and α-particle energy. This experiment demonstrates the applicability of the LIST at radioactive ion-beam facilities for the production and study of pure beams of exotic isotopes.

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“…As a result the separation of the laser ionization area from the target/ion source assembly via a repeller electrode is intended for a complete suppression of surface ionized isobars [10]. The latter construction is conveniently operated only by incorporation of a radiofrequency (RF) quadrupole ion guide system in the form of the LIST project [11,12], described towards the end of this paper.…”

Section: Introductionmentioning

confidence: 99%

The selective and efficient laser ion source and trap project LIST for on-line production of exotic nuclides

et al. 2010

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Laser ion sources based on resonant excitation and ionization of atoms are well-established tools for selective and efficient production of radioactive ion beams. A recent trend is the complementary installation of reliable state-of-theart all solid-state Ti:Sapphire laser systems. To date, 35 elements of the Periodic Table are available at laser ion sources by using these novel laser systems, which complements the overall accessibility to 54 elements including use of traditional dye lasers. Recent progress in the field concerns the identification of suitable optical excitation schemes for Ti:Sapphire laser excitation as well as technical developments of the source in respect to geometry, cavity material as well as by incorporation of an ion guide system in the form of the laser ion source trap LIST.

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A highly selective laser ion source for bunched, low emittance beam release

Cited by 17 publications

References 7 publications

Segmented linear radiofrequency quadrupole/laser ion source project at TRIUMF

Segmented linear radiofrequency quadrupole/laser ion source project at TRIUMF

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

The selective and efficient laser ion source and trap project LIST for on-line production of exotic nuclides

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