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RFQ cooler and buncher project for ISOLDE

RFQ cooler and buncher project for ISOLDE. Present status and off-line test results. Hanna Fr ånberg, ISOLDE. Reduced transverse emittance Reduced energy spread Beam bunching capability. For a wide range of masses Relatively fast cooling (< ms). Why an RFQ CB for ISOLDE.

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RFQ cooler and buncher project for ISOLDE

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  1. RFQ cooler and buncher project for ISOLDE Present status and off-line test results Hanna Frånberg, ISOLDE

  2. Reduced transverse emittance Reduced energy spread Beam bunching capability For a wide range of masses Relatively fast cooling (< ms) Why an RFQ CB for ISOLDE H. Frånberg, INTAG workshop GSI May 24-25 2007

  3. Examples for applications • Injection into mass spectrometers e.g. ISOLTRAP, MISTRAL, JYFLTRAP • Laser spectroscopy • COLLAPS, JYFL • Injection into mass separators • HRS of ISOLDE, EURISOL H. Frånberg, INTAG workshop GSI May 24-25 2007

  4. Installation of RFQ Today: October 2007: 2nd step: future: EURISOL HIE Isolde: H. Frånberg, INTAG workshop GSI May 24-25 2007 Tim Giles

  5. Where at ISOLDE H. Frånberg, INTAG workshop GSI May 24-25 2007

  6. Cartoon of the RFQ installation RIB from HRS H. Frånberg, INTAG workshop GSI May 24-25 2007

  7. RFQ Cooler technique • RF for radial confinement • DC Segments for axial trapping • Gas for cooling H. Frånberg, INTAG workshop GSI May 24-25 2007

  8. Aims of the off-line tests • Transmission efficiency • As a function of the mass • Alkali ions Li,Na, K, Cs • Ar / noble gases from a FEBIAD source • CW and pulsed mode • Beam quality improvements • Emittance measurements • Time and energy spread of the bunches • Specific issues • Space charge limit with bunched beams • Recombination of noble gases with impurities H. Frånberg, INTAG workshop GSI May 24-25 2007

  9. ISCOOL off-line tests • RFQ • RF Oscillator • Test ion source • 2 FCs for diagnostics • Quadrupole Triplet H. Frånberg, INTAG workshop GSI May 24-25 2007

  10. Optimized transmissions CW mode H. Frånberg, INTAG workshop GSI May 24-25 2007

  11. Ion cooling CW mode When optimizing the buffer gas pressure or the RF voltage the emittance decreases as transmission efficiency increases H. Frånberg, INTAG workshop GSI May 24-25 2007

  12. Example of emittance plots ~35p·mm·mrad 95% emittance ~2.2p·mm·mrad 95% emittance H. Frånberg, INTAG workshop GSI May 24-25 2007

  13. Bunched beams • Preliminary tests with Na ions • Transmission close to CW operation (>20%) • Space charge limits in transmission efficiency not seen up to 106-107 ions/bunch • BUT: long bunches >50ms • may be due to the (too) simple extraction scheme adopted up to now – pulsing of the extraction plate only H. Frånberg, INTAG workshop GSI May 24-25 2007

  14. Next steps • Off-line commissioning • Tests with a FEBIAD ion source (Ar) • ISOLDE-like ion source • Charge recombination in the buffer gas? • Tests of the bunching mode with a better extraction scheme • Pulsing the extraction plate and the last segments of the buncher • Installation • HV platform - next June • Installation of the RFQ - October H. Frånberg, INTAG workshop GSI May 24-25 2007

  15. P. Delahaye, R. Catherall, M. Lindroos, T. Giles, I. Podadera E. Mané, J. Billowes, F. Duval A. Jokinen 1 Schuster Laboratory , University of Manchester, United Kingdom CERN, CH-1211 Geneva 23, Switzerland 3 ISMRA, Caen, France 4 Department of Physics, University of Jyväskylä, Finland Thank you for your attention! In collaboration with: H. Frånberg, INTAG workshop GSI May 24-25 2007

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