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TUP05 |
Towards Laser Cooling of Relativistic 16O5+ Ion Beams at the CSRe | |
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Laser cooling is one of the most promising techniques to achieve high phase-space densities or even crystalline beams for relativistic heavy ion beams at storage rings [*]. In addition, precision laser spectroscopy of relevant transitions in highly charged ions can also be performed simultaneously during the laser cooling experiments [**]. In the storage ring CSRe at IMP, a new laser cooling experiment for Li-like 16O5+ ion beams is currently being prepared and will be carried out at the end of the year 2017 under the Laser-cooling Collaboration. During the experiment, a CW laser with a wavelength of 220 nm will be used to cool the 16O5+ ion beams with an energy of 280 MeV/u. The 16O5+ ion beams will be the highest charge state and highest energy ions ever used for laser cooling at the storage rings. In the experiment, the longitudinally dynamics of ultra-cold ion beams will be investigate systematically towards the transition of the space charge dominated regime. Precision laser spectroscopy of 16O5+ ions for measuring the transition energy of 2s1/2'2p1/2 and 2s1/2'2p3/2 is foreseen.
[*] U. Schramm et al., Progress in Particle and Nuclear Physics, 53 (2004) 583-677. [**] U. Schramm et al., Hyperfine Interactions 162(1) (2005), 181-188 |
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TUP18 |
Stochastic Cooling Developments for the Spectrometer Ring (Sring) in the HIAF Project at IMP | |
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| We report on the preliminary design of Slot-ring and Faltin type pickups and kickers for stochastic pre-cooling of rare isotope beams from 625 MeV/u to 840 MeV/u (\beta: 0.80-0.85), or from 400 MeV/u to 625 MeV/u (\beta: 0.71-0.80), using a bandwidth of 1-2 GHz (or 0.6-1.2 GHz) for Spectrometer ring (Sring) in the HIAF project at IMP. The kicker shunt impedance and signal output phase of Slot-ring and Faltin type are calculated by HFSS. From the simulation results, Slot-ring structure is better for higher \beta (0.80-0.85), and Faltin type will be a better choice for \beta from 0.71 to 0.80 when the beam aperture is 200 mm*120 mm. | ||
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Poster TUP18 [2.015 MB] | |
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THA12 |
Stochastic Cooling Plan and Experiments for HIAF and CSRe | |
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| In December 2015 stochastic cooling of heavy ions was successfully applied for the first time at the CSRe storage ring of IMP in Lanzhou, China. During four days of commissioning, three-dimensional cooling could be observed. Both the time-of-flight and the notch filter methods were used for longitudinal cooling. The measured cooling rates are presented. In the end of December 2015, the project HIAF'High Intensity heavy ion Accelerator Facility was approved by the Chinese government. The project will be started to construct in 2018. Stochastic cooling will be built at the spectrometer ring (SRing) mainly for experiments with radioactive fragment beams with a large phase space, which is very similar to CSRe. After the stochastic pre-cooling, the subsequent electron cooling will further cool down the emittance and Dp/p to get extremely well-cooled beams. The primary design and the simulation results will be presented at the conference. | ||
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Slides THA12 [16.374 MB] | |
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