Europhysics Letters

  Previous Article | Back to Volume | Next Article
  Abstract | References | Citation | Download | Preview | Statistics
Sample volume 1
Title New stopping cell capabilities: RF carpet performance at high gas density and cryogenic operation
Author M. Ranjan, S. Purushothaman, T. Dickel, H. Geissel, W. R. Plass, D. Schafer, C. Scheidenberger, J. Van de Walle, H. Weick, P. Dendooven
Abstract We have developed a stopping cell to be used at the FRS and Super-FRS (Super-conducting FRagment Separator) at the GSI Helmholtz Centre for Heavy-Ion Research and the Facility for Antiproton and Ion Research (FAIR), both in Darmstadt, Germany. The cell has a stopping volume with a length of 1 m and a diameter of 25 cm. It is aimed at operation with high-density helium gas (up to 0.2 mg/cm3). Ours is the first realisation of a stopping cell in which the required purity of the helium stopping gas is ensured by operation at cryogenic temperatures. On the exit side, the ions are guided to the exit hole by an RF carpet with 4 electrodes per mm, operating at a frequency of 5.8 MHz. We present the first commissioning results of the cryogenic stopping cell. Using 219Rn ions emitted as alpha-decay recoils from a 223Ra source, a combined ion survival and extraction efficiency between 10 and 25% is measured for helium gas at a temperature of 85 K and with a density up to 0.07 mg/cm3 (equivalent to a pressure of 430 mbar at room temperature). This density is almost two times higher than demonstrated up to now for RF ion repelling structures in helium gas. Given the operational and design parameters of the system, it is projected that this technology is useful up to a helium gas density of at least 0.2 mg/cm3.
Citation
References
[1] Arje J., ¨ Ayst ¨ o J., Hyv ¨ onen H., Taskinen P., Kopo- ¨nen V., Honkanen J., Hautojarvi A. ¨ and VierinenK., Phys. Rev. Lett., 54 (1985) 99.
[2] Ayst ¨ o J. ¨ , Nucl. Phys. A, 693 (2001) 477.
[3] Dendooven P., Nucl. Instrum. Methods Phys. Res. B,126 (1997) 182.
[4] Wada M., Ishida Y., Nakamura T., Yamazaki Y.,Kambara T., Ohyama H., Kanai Y., Kojima T.M., Nakai Y., Yoshida A., Kubo T., Matsuo Y.,
Fukuyama Y., Okada K., Sonoda T., Ohtani S.,Noda K., Kawakami H. and Katayama I., Nucl.Instrum. Methods Phys. Res. B, 204 (2003) 570.
[5] Petrick M., Plass W. R., Behr K.-H., Brunle ¨A., Caceres L., Clark J., Di Z., Elisseev S.,Facina M., Fettouhi A., Geissel H., Huller W., ¨Huyse M., Karagiannis C., Kindler B., Knobel R., ¨Kudryavtsev Y., Kurcewicz J., Levant T., Litvinov Y. A., Lommel B., Maier M., Morrissey D. J.,Munzenberg G., Portillo M., Savard G., Scheiden- ¨berger C., Van Duppen P., Weick H., Winkler M.
and Zabransky B., Nucl. Instrum. Methods Phys. Res.B, 266 (2008) 4493.
[6] Scheidenberger C., Geissel H., Maier M.,Munzenberg G., Portillo M., Savard G., Van ¨Duppen P., Weick H., Winkler M., Yavor M.,Attallah F., Behr K.-H., Chichkine V., EliseevS., Hausmann M., Hellstrom M., Kaza E., Kindler ¨B., Litvinov Y., Lommel B., Marx G., Matos M.,Nankov N., Ohtsubo T., Summerer K., Sun Z.-Y. ¨and Zhou Z., Nucl. Instrum. Methods Phys. Res. B, 204(2003) 119.
[7] Weick H., Geissel H., Scheidenberger C., AttallahF., Baumann T., Cortina D., Hausmann M., LommelB., Munzenberg G., Nankov N., Nickel F., Radon ¨T., Schatz H., Schmidt K., Stadlmann J., Summerer ¨K., Winkler M. and Wollnik H., Nucl. Instrum.Methods Phys. Res. B, 164-165 (2000) 168.
[8] Weissman L., Morrissey D. J., Bollen G., DaviesD. A., Kwan E., Lofy P. A., Schury P., SchwarzS., Sumithrarachchi C., Sun T. and Ringle R., Nucl.
Instrum. Methods Phys. Res. A, 540 (2005) 245.
[9] Savard G., Clark J., Boudreau C., BuchingerF., Crawford J. E., Geissel H., Greene J. P.,Gulick S., Heinz A., Lee J. K. P., Levand A.,Maier M., Munzenberg G., Scheidenberger C., ¨Seweryniak D., Sharma K. S., Sprouse G. D., Vaz J.,Wang J. C., Zabransky B. J., Zhou Z. and the S258Collaboration, Nucl. Instrum. Methods Phys. Res. B,204 (2003) 582.
[10] Takamine A., Wada M., Ishida Y., Nakamura T.,Okada K., Yamazaki Y., Kambara T., Kanai Y.,Kojima T. M., Nakai Y., Oshima N., Yoshida A.,
Kubo T., Ohtani S., Noda K., Katayama I., HostainP., Varentsov V. and Wollnik H., Rev. Sci. Instrum.,76 (2005) 103503.
[11] Huyse M., Facina M., Kudryavtsev Y., Van DuppenP. and Isolde Collaboration, Nucl. Instrum. MethodsPhys. Res. B, 187 (2002) 535.
[12] Facina M., Bollen G. and Morrissey D., HyperfineInteract., 174 (2007) 21.
[13] Kudryavtsev Y., Bruyneel B., Huyse M., GentensJ., Van den Bergh P., Van Duppen P. andVermeeren L., Nucl. Instrum. Methods Phys. Res. B,179 (2001) 412.
[14] Dendooven P., Purushothaman S. and Gloos K.,Nucl. Instrum. Methods Phys. Res. A, 558 (2006) 580.
[15] Purushothaman S., Dendooven P., Moore I.,Penttila H., Ronkainen J., Saastamoinen A., ¨ Ayst ¨ o¨J., Peraj ¨ arvi K., Takahashi N. ¨ and Gloos K., Nucl.
Instrum. Methods Phys. Res. B, 266 (2008) 4488.
[16] Purushothaman S., PhD Thesis, University of Groningen, 2008, ISBN 978-90-367-3651-0.
[17] Eliseev S., Block M., Dworschak M., Herfurth F.,Kluge H.-J., Martin A., Rauth C. and Vorobjev G.,Nucl. Instrum. Methods Phys. Res. B, 266 (2008) 4475.
[18] Bollen G., Campbell C., Chouhan S., Gunaut C.,Lawton D., Marti F., Morrissey D. J., Ottarson J.,Pang G., Schwarz S., Zeller A. F. and Zavodszky P.,
Nucl. Instrum. Methods Phys. Res. B, 266 (2008) 4442.
[19] Super-FRS Technical Design Report, www.gsi.de/nustar.
[20] Quality Products International, www.qpigroup.com.
[21] www.rogerscorp.com.
[22] Schafer D. ¨ , Diploma Thesis, Justus-Liebig-Universit¨atGieß; en, 2010.
[23] Huikari J., PhD Thesis, Department of Physics, University of Jyv¨askyl¨a, Research Report No. 10/2003, ISBN951-39-1632-4.
[24] Eliseev S. A., Block M., Chaudhuri A., Di Z., Habs D., Herfurth F., Kluge H.-J., Neumayr J. B., PlassW. R., Rauth C., Thirolf P. G., Vorobjev G. andWang Z., Nucl. Instrum. Methods Phys. Res. B, 258(2007) 479.
[25] Plass W. R., Dickel T., Czok U., Geissel H.,Petrick M., Reinheimer K., Scheidenberger C. andI.Yavor M., Nucl. Instrum. Methods Phys. Res. B, 266
(2008) 4560.
Keywords
Download Full PDF Download
  Previous Article | Back to Volume | Next Article
Share
Search in articles
Statistics
Journal Published articles
EPL 102
Journal Hits
EPL 211200
Journal Downloads
EPL 340
Total users online -