Extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell

被引：34

作者：

Eliseev, S. A.

Block, M.

Chaudhuri, A.

Di, Z.

Habs, D.

Herfurth, F.

Kluge, H. J.

Neumayr, J. B.

Plass, W. R.

Rauth, C.

Thirolf, P. G.

Vorobjev, G.

Wang, Z.

机构：

[1] Gesell Schwerionenforsch mbH, D-64291 Darmstadt, Germany

[2] St Petersburg Nucl Phys Inst, Gatchina, Russia

[3] Univ Greifswald, D-17489 Greifswald, Germany

[4] Univ Giessen, D-35392 Giessen, Germany

[5] Univ Munich, D-85748 Garching, Germany

[6] Univ Heidelberg, D-69120 Heidelberg, Germany

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2007年 / 258卷 / 02期

关键词：

gas-filled stopping cell; efficiency; extraction time; time-of-flight spectrometer; Exotic Nuclei;

D O I：

10.1016/j.nimb.2007.01.291

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell were measured and chemical processes occurring during extraction of the stopped ions were investigated. The measurements were performed using Rn-219 recoil ions from the alpha-decay of a calibrated point-like Ra-223 ion source. The extraction time was measured to be shorter than 10 ms at a helium gas pressure in the gas cell of 40 mbar. Thus, nuclides with half-lives on the order of a few milliseconds are accessible for the various precision experiments planned at SHIPTRAP. Extraction efficiencies of up to 30% were obtained at a helium pressure of 50 mbar. The estimated total efficiency of the gas cell, derived from the product of calculated stopping and measured extraction efficiency, amounts to about 10%. Factors limiting the efficiency are quantitatively understood. Under standard operating conditions, ion molecule reactions in the gas cell do not seem to limit the efficiency of the gas cell significantly. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：479 / 484

页数：6

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