WEM13
MPI-K, Heidelberg, Germany
*R. von Hahn et al., Rev. Sci. Instr. 87, 063115 (2016)
**A. O'Connor et al., PRL 116, 113002 (2016)
***C. Meyer et al., PRL 119, 023202 (2017)
****D. Orlov et al., J. Appl. Phys. 106, 054907(2009)
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WEM13 |
Electron Cooling of Bunched Ion Beams and Recent Results at the Heidelberg Cryogenic Storage Ring (CSR) | |
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The cryogenic storage ring CSR is an electrostatic machine of 35 m circumference for positive and negative ions at up to 300 keV kinetic energy per charge. Vacuum chambers and ion optics are cooled to well below 10 K by a closed-cycle He system. Rest gas densities down to a room-temperature equivalent pressure of <10-14 mbar and 1/e ion-beam lifetimes up to ~45 min were observed*. With rotationally cold diatomic ions, photodissociation Feshbach resonances of CH+ (J=0,1,2) were reported**. By time-dependent laser photodetachment, free-space radiative lifetimes of OH− ions (J=1,2) up to ~190 s were measured***. An electron cooling device with a cryogenic (high-temperature superconducting) magnet and beam-merging system was taken into operation with an electron beam of ~40 eV from the TSR GaAs photocathode system****. It was applied to perform bunched-beam electron cooling of 1200 keV F(6+) ions. Future research will be devoted to interaction studies between stored atomic, molecular and cluster ions and laser, electron and neutral particle beams. Electron-beam studies (meV relative energies) will focus on dissociative recombination and state-changing collisions of molecular ions.
*R. von Hahn et al., Rev. Sci. Instr. 87, 063115 (2016) **A. O'Connor et al., PRL 116, 113002 (2016) ***C. Meyer et al., PRL 119, 023202 (2017) ****D. Orlov et al., J. Appl. Phys. 106, 054907(2009) |
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Slides WEM13 [9.830 MB] | |
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