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On-line tests RFQ cooler ISCOOL A quick summary

On-line tests RFQ cooler ISCOOL A quick summary. P. Delahaye, H. Fr å nberg, I. Podadera ISCOOL, COLLAPS, ISOLDE collaboration. Where at ISOLDE. Installation in pictures. Principle. Three elements: RF quadrupolar field Radial confinement DC potentials

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On-line tests RFQ cooler ISCOOL A quick summary

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  1. On-line tests RFQ coolerISCOOLA quick summary P. Delahaye, H. Frånberg, I. Podadera ISCOOL, COLLAPS, ISOLDE collaboration

  2. Where at ISOLDE

  3. Installation in pictures

  4. Principle • Three elements: • RF quadrupolar field • Radial confinement • DC potentials • Extracting ion in bunches or in continuos mode • Buffer gas •  Ion motion cooling

  5. Emittance measurements ~35p·mm·mrad 95% emittance ~2.2p·mm·mrad 95% emittance

  6. Transmissions • Potentials along the axis • Transmissions in DC • 23Na: 50% • 39K: >75% • 85Rb: >75% 50V (30V enough) 5-2V/cm 80eV TRAPPING ~1E-2 mbar 4He 10-2mbar l/s INJECTION EXTRACTION Better than the off-line tests! Smaller emittances from ISOLDE surface ion sources than from the ion source used during off-line tests.

  7. Cooling time • TOF < 1ms from the entrance to the exit of the RFQ • 1 passage is enough to get a cold beam • as measured off-line, and other labs as predicted by simulations for other systems

  8. 50V (30V enough) 5-2V/cm 80eV TRAPPING ~1E-2 mbar 4He 10-2mbar l/s INJECTION EXTRACTION Bunching mode 30keV

  9. Space charge limits • Up to 108/s!! As measured with FC (data under analysis with MCP) 39K 85Rb

  10. Bunch width • Depends on the space charge and cooling time Collection / cooling time

  11. Preliminary results • Data from 26Na needs to be analyzed • Losses due to trapping time (analysis in progress) • Chemistry, noble gases, reactive elements • More data needed for more masses (light ions) • CaO target + plasma ion source should provide some answers

  12. ISCOOL TEST 46K Beam 1E5 ions/s after the cooler. Collection time 20 minutes, with 300ms bunching and a 12us gate and 2mW of laser power. Singles (continuous counting) Bunched:12us gated spectra Background suppression factor~1E4

  13. AB-OP-PSB-iso team: Pascal, Erwin, Magnus, Emiliano and Tim. AB/ATB AB/CO AB/PO AB/VAC SC/RP ISOLDE collaboration COLLAPS collaboration ISCOOL collaboration Thanks to:

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