Abstract
We report on the realization and operation of a fast ion beam trap of the linear electrostatic type employing liquid helium cooling to reach extremely low blackbody radiation temperature and residual gas density and, hence, long storage times of more than 5 min which are unprecedented for keV ion beams. Inside a beam pipe that can be cooled to temperatures <15 K, with 1.8 K reached in some locations, an ion beam pulse can be stored at kinetic energies of 2-20 keV between two electrostatic mirrors. Along with an overview of the cryogenic trap design, we present a measurement of the residual gas density inside the trap resulting in only 2× 103 cm-3, which for a room temperature environment corresponds to a pressure in the 10-14 mbar range. The device, called the cryogenic trap for fast ion beams, is now being used to investigate molecules and clusters at low temperatures, but has also served as a design prototype for the cryogenic heavy-ion storage ring currently under construction at the Max-Planck Institute for Nuclear Physics.
| Original language | English |
|---|---|
| Article number | 055105 |
| Journal | Review of Scientific Instruments |
| Volume | 81 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2010 |
| Externally published | Yes |
Bibliographical note
Funding Information:We would like to acknowledge the good collaboration with H. Quack and his co-workers from the Technische Universität Dresden and their invaluable assistance concerning the cryogenic design of both the CSR and the CTF. We also thank C. Day from the Karlsruher Institut für Technologie for sharing his expertise in the development of the bakeable cryopump, and in particular for his contribution of the actual charcoal carrier installed in the CTF. The commitment of the technical and engineering staff both at the Max-Planck-Institut für Kernphysik and the Weizmann Institute of Science is also greatly appreciated. Their support and attention to detail over the design and testing phase of the CTF, in particular the efforts of D. Kaiser and M. Frauenfeld relating to the helium refrigeration system, have been a key factor in bringing this complex apparatus to operation and continue to be for the CSR. We also greatly acknowledge the advice gained in fruitful discussions with C. Benvenuti and C. Rathjen from CERN (AT/VAC), B. Petersen from DESY, Hamburg, and C. Schröder from GSI, Darmstadt. F. Laux and S. Menk acknowledge support from the Alliance Program of the Helmholtz Association (HA216/EMMI). Finally we would like to thank both the European Commission, who supported the CTF/CSR project within the framework of the ITS-LEIF (Ion Technology and Spectroscopy at Low Energy Ion Beam Facilities) initiative, and the German Israel Foundation (GIF) who funded the project under Contract No. I-900-231.7/2005.
Funding
We would like to acknowledge the good collaboration with H. Quack and his co-workers from the Technische Universität Dresden and their invaluable assistance concerning the cryogenic design of both the CSR and the CTF. We also thank C. Day from the Karlsruher Institut für Technologie for sharing his expertise in the development of the bakeable cryopump, and in particular for his contribution of the actual charcoal carrier installed in the CTF. The commitment of the technical and engineering staff both at the Max-Planck-Institut für Kernphysik and the Weizmann Institute of Science is also greatly appreciated. Their support and attention to detail over the design and testing phase of the CTF, in particular the efforts of D. Kaiser and M. Frauenfeld relating to the helium refrigeration system, have been a key factor in bringing this complex apparatus to operation and continue to be for the CSR. We also greatly acknowledge the advice gained in fruitful discussions with C. Benvenuti and C. Rathjen from CERN (AT/VAC), B. Petersen from DESY, Hamburg, and C. Schröder from GSI, Darmstadt. F. Laux and S. Menk acknowledge support from the Alliance Program of the Helmholtz Association (HA216/EMMI). Finally we would like to thank both the European Commission, who supported the CTF/CSR project within the framework of the ITS-LEIF (Ion Technology and Spectroscopy at Low Energy Ion Beam Facilities) initiative, and the German Israel Foundation (GIF) who funded the project under Contract No. I-900-231.7/2005.
| Funders | Funder number |
|---|---|
| German Israel Foundation | I-900-231.7/2005 |
| Center for Strategic Research | |
| Cyrus Tang Foundation | |
| European Commission | |
| Helmholtz Association | HA216/EMMI |