An ion cooler-buncher for high-sensitivity collinear laser spectroscopy at ISOLDE

被引：95

作者：

Mane, E. ^{[1
]}

Billowes, J. ^{[1
]}

Blaum, K. ^{[2
]}

Campbell, P. ^{[1
]}

Cheal, B. ^{[1
]}

Delahaye, P. ^{[3
]}

Flanagan, K. T. ^{[4
]}

Forest, D. H. ^{[5
]}

Franberg, H. ^{[3
]}

Geppert, C. ^{[6
]}

Giles, T. ^{[3
]}

Jokinen, A. ^{[7
,8
]}

Kowalska, M. ^{[3
]}

Neugart, R. ^{[6
]}

Neyens, G. ^{[9
]}

Noertershaeuser, W. ^{[6
]}

Podadera, I. ^{[10
]}

Tungate, G. ^{[5
]}

Vingerhoets, P. ^{[9
]}

Yordanov, D. T. ^{[2
]}

机构：

[1] Univ Manchester, Manchester M13 9PL, Lancs, England

[2] Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany

[3] CERN, ISOLDE, CH-1211 Geneva 23, Switzerland

[4] IPN, IN2P3, CNRS, F-91406 Orsay, France

[5] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

[6] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[7] Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland

[8] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[9] Katholieke Univ Leuven, IKS, B-3001 Heverlee, Belgium

[10] CIEMAT, Accelerator Grp, Madrid 28040, Spain

来源：

EUROPEAN PHYSICAL JOURNAL A | 2009年 / 42卷 / 03期

关键词：

NUCLEAR-PHYSICS; BEAM; ISOTOPES; MOMENTS; RADII; TRAP;

D O I：

10.1140/epja/i2009-10828-0

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A gas-filled segmented linear Paul trap has been installed at the focal plane of the high-resolution separator (HRS) at CERN-ISOLDE. As well as providing beams with a reduced transverse emittance, this device is also able to accumulate the ions and release the sample in bunches with a well-defined time structure. This has recently permitted collinear laser spectroscopy with stable and radioactive bunched beams to be demonstrated at ISOLDE. Surface-ionized K-39,K-44,K-46 and Rb-85 beams were accelerated to 30 keV, mass separated and injected into the trap for subsequent extraction and delivery to the laser setup. The ions were neutralized in a charge exchange cell and excited with a co-propagating laser. The small ion beam emittance allowed focussing in the ion-laser overlap region, which is essential to achieve the best experimental sensitivity. Fluorescent photons were detected by a photomultiplier tube as a frequency scan was taken. A gate (typically 7-12 mu s wide) was set on the photomultiplier signal to accept the fluorescent photons within the time window defined by the bunch. Thus, using accumulation times of 100 ms, the dominant contribution to background due to continuous laser scattering could be reduced by a factor of up to 4 x 10(4).

引用

页码：503 / 507

页数：5

共 13 条

[1] HIGH-RESOLUTION LASER SPECTROSCOPY FOR THE STUDY OF NUCLEAR SIZES AND SHAPES [J].