Contact
Ion cooling and storage in the cold beam trap CTF
The Cryogenic Trap for Fast ion beams (CTF) [1] is a cryogenic Electrostatic Ion Beam Trap (EIBT) [2,3]. Ion beams with an energy of some keV can be trapped. The CTF has been initially designed to test vacuum and cooling concepts as well as the mechanical setup of the cryogenic storage ring (CSR).
Stored ions are reflected back and forth between two electrostatic mirrors. Einzellenses focus the ion beam towards the trap center. The cryogenic temperature of the environment (<15 K) leads to extremely low rest-gas densities of 2000 particles/cm-3 comparable to a pressure of 10-13 mbar at room temperature. Storage times of minutes have been realized. A pickup electrode is installed for non-destructive ion detection. The revolution frequency of the stored particles is used to determine their mass. Neutralized particles leaving the trap are detected by a microchannelplate (MCP) detector behind the trap electrodes.
The CTF is used to investigate dynamical processes of stored ion beams. In order to investigate the cooling of rotational and vibrational modes of molecules and metal cluster negatively charged ions are excited by a pulsed, tunable laser system (OPO). The neutralization rate is measured in dependence of laser wavelength and storage time allowing to draw conclusions about the internal structure of molecules and cluster.
Especially the optimal conditions of the CTF such as the cryogenic environment enable these experiments.
References
| [1] |
M. Lange et al., Rev. Sci. Instrum. 81 (2010) 055105.  |
| [2] | M. Dahan et al., Rev. Sci. Instrum. 69 (1998) 76. |
| [3] | D. Zaifman et al., Phys. Rev. A 55 (1997) 1577. |
Contact
List of publications
2016
| 9. | Decay processes and radiative cooling of small anionic copper clusters C. Breitenfeldt, K. Blaum, M. W. Froese, S. George, G. Guzmán-Ramírez, M. Lange, S. Menk, L. Schweikhard, and A. Wolf Phys. Rev. A 94, 033407 (2016)
|
| 8. | Spreading times of ion-bunches in the Cryogenic Trap for Fast ion beams C. Breitenfeldt, M. W. Froese, K. Blaum, S. George, M. Grieser, M. Lange, S. Menk, R. Repnow, D. Schwalm, L. Schweikhard, R. von Hahn, A. Wolf Int. J. Mass. Spectrom. 396, 1-4 (2016)
|
2014
| 7. | Vibrational autodetachment of sulfur hexafluoride anions at its long-lifetime limit S. Menk, S. Das, K. Blaum, M. W. Froese, M. Lange, M. Mukherjee, R. Repnow, D. Schwalm, R. von Hahn, and A. Wolf Phys. Rev. A 89, 022502 (2014)
|
2013
| 6. | Beam dynamics and internal cooling of ions stored in a cryogenic
electrostatic ion beam trap M. Lange AIP Conf. Proc. 1521, 220-229 (2013)
|
2012
| 5. | Radiative cooling of Al4- and Al5- in a cryogenic environment M. Lange, M. W. Froese, S. Menk, D. Bing, F. Fellenberger, M. Grieser, F. Laux, D. A. Orlov, R. Repnow, T. Sieber, Y. Toker, R. von Hahn, A. Wolf and K. Blaum New J. Phys. 14, 065007 (2012)
|
| 4. | The decay of ion bunches in the self-bunching mode M. W. Froese, M. Lange, S. Menk, M. Grieser, O. Heber, F. Laux, R. Repnow, T. Sieber, Y. Toker, R. von Hahn, A. Wolf and K. Blaum New J. Phys. 14, 073010 (2012)
|
2011
| 3. | Thermionic power-law decay of excited aluminum-cluster anions and its
dependence on storage-device temperature M. W. Froese, K. Blaum, F. Fellenberger, M. Grieser, M. Lange, F. Laux, S. Menk, D. A. Orlov, R. Repnow, T. Sieber, Y. Toker, R. von Hahn, and A. Wolf Phys. Rev. A 83, 023202 (2011)
|
2010
| 2. | A cryogenic electrostatic trap for long-time storage of keV ion beams M. Lange, M. Froese, S. Menk, J. Varju, R. Bastert, K. Blaum, J. R. Crespo López-Urrutia, F. Fellenberger, M. Grieser, R. von Hahn, O. Heber, K.-U. Kühnel, F. Laux, D. Orlov, M. L. Rappaport, R. Repnow, C. D. Schröter, D. Schwalm, A. Shornikov, T. Sieber, Y. Toker, J. Ullrich, A. Wolf, and D. Zajfman Rev. Sci. Instrum. 81, 055105 (2010)
|
2009
| 1. | Cryogenic ion beam storage M. Froese, K. Blaum, J.R. Crespo López-Urrutia, F. Fellenberger, M. Grieser, D. Kaiser, M. Lange, F. Laux, S. Menk, D.A. Orlov, R. Repnow, C.D. Schröter, D. Schwalm, A. Shornikov, T. Sieber, J. Ullrich, J. Varju, R. von Hahn, A Wolf, O. Heber, M. Rappaport, J. Toker, D. Zajfman Proceedings of PAC09, Vancouver, BC, Canada, May 2009 paper FR5REP041 (pdf, 4.85 MB)
|