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JYFL ION COOLER AND BUNCHER

JYFL ION COOLER AND BUNCHER. The JYFL IGISOL facility. High Voltage. Cyclotron beam. Ion guide. Separator magnet. Beam switchyard. Ion Beam Cooler. 90  bend. High Voltage. Penning Trap. 2 m. 0. 1. Cooler layout. Ion beam cooler. Central beam line. Cooler beam line.

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JYFL ION COOLER AND BUNCHER

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  1. JYFL ION COOLER AND BUNCHER

  2. The JYFL IGISOL facility High Voltage Cyclotron beam Ion guide Separator magnet Beam switchyard Ion Beam Cooler 90 bend High Voltage Penning Trap 2 m 0 1

  3. Cooler layout Ion beam cooler Central beam line Cooler beam line Beam switchyard

  4. 89Y

  5. Energy spread Collinear laser spectroscopy setup Off-line Barium beam dEFWHM < 4 eV 20 MHz doppler broadening Beam intensity cut off vs. bias voltage. Intensive beams (129Xe, few nA) dEFWHM = 1.5 eV On-line beams 105 ions/s dEFWHM = 0.7 eV Off-line 129Xe+

  6. Delay time IGISOL delay time ~ms Without axial field: diffusion, space charge Depends on: - Einj - dEinj - pHe Without axial field up to hundreds of ms Shorter by axial electric field (down to ms region) Longer  beam bunching

  7. ii iii iv i

  8. Transmission - 29 MeV proton induced fission of 238U - Normal ion guide pressure 250 mbar - Skimmer voltage varied - A = 112 IGISOL beam (mostly 112Rh) - Beta count rate in two Si-detector setups, before and after the cooler - Transmission > 60 %

  9. Potential along z - axis +70 V (collect) 0 V (release) +2 V +1 V +0.5 V Z -1V Bunching - Separator beam on t = 0 - 1000 ms - Cooler end plate voltage down t = 3300-4000 ms

  10. LCR IONS LASER Delayed Ion-photon coincidence method Bunched beam method Photons gated on the ion bunch Singles photons Counts Photons gated on the ion bunch Ion Beam Energy Tuning (eV)

  11. 174Hf ttrap = 0.5 s Gate1 = 15 ms Gate1 = 30 ms Gate1 = 75 ms Hf 15(1) ms Ti 10(1) ms (with <10 000 ions/bunch) Bunch width - Mass and Space charge effects

  12. Ion survival in the Buncher

  13. P. Campbell et al. Hypf. Int. 127 (2000) On-line photon efficiency in collinear laser spectroscopy (ion survival) Without the buncher - Metastable population - IGISOL pressure With the buncher - Off-line efficiencies hold metastables reduced - No IGISOL pressure effects (below fig. pIG=450 mbar)

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