An ion-guide technique for on-line isotope separation coupled with a recoil-type beam separator

doi:10.1016/0168-9002(88)90857-1

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 269, Issue 1, 1 June 1988, Pages 23-28

https://doi.org/10.1016/0168-9002(88)90857-1 Get rights and content

Abstract

The efficiency of an ion-guide isotope separator on-line has been shown to increase to a great extent when only nuclear reaction products of interest are guided into a gas region of the ion-guide system after separating them from beam particles using a gas-filled recoil beam separator. An effective volume to the present ion-guide system is larger than in usual, indicating that this method is very effective in heavy-ion reactions yielding high recoil velocities for reaction products.

References (10)

J. Ärje et al.
Nucl. Instr. and Meth.
(1986)
H. Miyatake et al.
Nucl. Instr. and Meth.
(1987)
K. Deneffe et al.
Nucl. Instr. and Meth.
(1987)
J. Ärje et al.
Phys. Rev. Lett.
(1985)
K. Morita et al.
Nucl. Instr. and Meth.
(1987)

There are more references available in the full text version of this article.

Cited by (18)

Genealogy of gas cells for low-energy RI-beam production
2013, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Citation Excerpt :
Another configuration is to combine IGISOL and a pre-separator that completely separates the primary beam from the reaction products. Nomura et al. used GARIS (GAs filled Recoil Ion Separator) [10] as a pre-separator. Such a configuration hinted at the possible combination of a projectile fragment separator and IGISOL.
In order to overcome serious limitations in the universality of the traditional isotope separator on-line technique, various endeavors have been made on gas catcher cells for converting relativistic RI-beams from in-flight separators to low-energy RI-beams. The origin of the gas catcher is found in the IGISOL (Ion guide isotope separator on-line) technique. Many developments have been made over the years to overcome the various difficulties and drawbacks found in the IGISOL technique.
Production of neutron deficient rare isotope beams at IGISOL; on-line and off-line studies
2004, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Citation Excerpt :
In the case of a fusion evaporation reaction, however, the reaction product distribution is forward peaked, thus, a special arrangement is needed. As a solution, both at RIKEN [9] and the Institute of Nuclear Study in University of Tokyo [10] the IGISOL system was installed at the focal plane of a gas filled recoil separator. An alternative arrangement is the shadow method, which takes advantage of the difference between the primary beam angular distribution and that of the reaction products after passing a relatively thick target (few mg/cm2).
This article reports on recent on-line yield measurements employing the light-ion and heavy-ion reaction-based ion guide systems and new results on α-recoil ion transport properties in ion guides with and without electric fields. In addition, the presently used ion guide designs for fusion evaporation reactions are introduced. The present study investigated different schemes for ion extraction from the gas cell. The addition of an extra ring electrode between the traditional skimmer electrode and the exit hole led to transmission independent of the primary beam intensity as opposed to strong intensity dependence observed earlier with the plain skimmer only. Furthermore, the mass resolving power of the IGISOL mass separator was increased to 1100 as compared to 250 with the skimmer system when using the RF-sextupole for the extraction from the heavy-ion ion guide. As a new method, the possibility to increase the ion guide efficiency by injecting electrons into the stopping volume is introduced. The efficiency of the electron emitter ion guide was a factor of ten higher in off-line conditions. Also, the influence of the buffer gas purity on the ion survival is discussed.
Development and applications of the IGISOL technique
2001, Nuclear Physics A
The development and present status of the Ion Guide Isotope Separator On-Line technique is presented. Applications to nuclear physics research include decay spectroscopy of proton- and neutron-rich nuclei of refractory elements and studies of their ground-state properties by collinear laser spectroscopy. Future developments, including ion-beam manipulations by linear RFQ and Penning traps, are discussed together with high-energy applications of the IGISOL technique.
Improved ion guide for heavy-ion fusion-evaporation reactions
1998, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
The ion guide for heavy-ion-induced reactions developed originally for the SARA facility in Grenoble has been implemented at the Jyväskylä IGISOL facility. For the ¹¹⁶Cd(⁴⁰Ar, 6n)¹⁵⁰Dy reaction an efficiency of 0.5% relative to the number of reaction products entering the stopping chamber was obtained. This is 3.5 times higher than previously obtained at SARA and corresponds to a yield of about 100 ions/(pμC mb). Mass-separated yields for the ³⁶Ar+⁹²Mo and ³⁶Ar+⁹⁴Mo reactions were measured.
Accumulation of ions from a recoil mass separator in a new type of linear ion trap
1997, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
A new type of linear ion trap system in combination with a sextupole ion beam guide (SPIG) has been developed for the accumulation of a continuous ion beam. An axial trapping potential is generated by three cylindrical electrodes mounted outside, but concentric to, the SPIG. The ions in a continuous beam are trapped in the potential well via collisions with He gas. This linear ion trap is called the “SPIG-trap”. The properties of the SPIG-trap were tested off-line with a discharge ion source in a gas cell. Up to 10⁶ ions were trapped and extracted as a bunch with an efficiency of 10% for 10 ms of accumulation. The SPIG-trap system was then connected to a gas filled recoil mass separator (GARIS) and tested with an energetic primary beam from a cyclotron (¹⁶O, 107 MeV). The overall efficiency of the SPIG-trap including ion losses in an energy degrader, which was placed in front of the He cell, was measured to be of the order of 10⁻⁵ for 10 ms accumulation.
The development and status of the IGISOL technique
1997, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

View all citing articles on Scopus

^∗: Present address: Department of Physics, University of Jyväskylä, Jyväskylä, Finland.

View full text

An ion-guide technique for on-line isotope separation coupled with a recoil-type beam separator

Abstract

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Phys. Rev. Lett.

Nucl. Instr. and Meth.