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The ISCOOL project

The ISCOOL project. Goals. Improvement of the ISOLDE beam quality. To maximize the efficiency of the beam transport. Bunched beam: short time width ( m s) and low energy spread (eV).

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The ISCOOL project

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  1. The ISCOOL project ISOLDE workshop and users meeting

  2. Goals • Improvement of the ISOLDE beam quality. • To maximize the efficiency of the beam transport. • Bunched beam: short time width (ms) and low energy spread (eV). • To adapt the beam optics to the requirements of present and new experiments (e.g. REX-ISOLDE, collinear laser spectroscopy). general purpose Radio Frequency Quadrupole Ion Cooler and Buncher (RFQCB) ISOLDE workshop and users meeting

  3. Where at ISOLDE? Project started during 2002 Cooled and bunched beams for all experiments connected to HRS ISCOOL(ISolde COOLer) HRS F. Herfurth et al., Nucl. Instrum. Methods A, 469, 254-275 (2001) C. Guenaut, PhD thesis, 2005 Existing beam line to replace ISOLDE workshop and users meeting

  4. The new beam line User’s beam gate Extraction quadrupoletriplet HV cage wall Movable part Doublequadrupoletriplet ISCOOL Injection quadrupoletriplet Focus HRS ISOLDE workshop and users meeting

  5. The new ISCOOL beam line 3360 mm 300 mm 330 mm 830 mm HRS beam 320 mm Diagnostic box &focus point HRS experiments Diagnostic box before merging switchyard Injection quadrupole triplet ISCOOL Extraction quadrupole triplet Transport calculations: T. Fritioff, T. Giles I. Podadera, N. Chritin ISOLDE workshop and users meeting

  6. Radio Frequency Quadrupole ion Coolers and Bunchers (RFQCBs) x z y Device developed from the Paul traps Bunched beam e90% ≈ 1 p mm mrad buffergas 60 kV Stability parameter (0÷0.91) Axial electrode RFelectrode ±V0cos(ωt) axial electric field ~0,1 V/cm Mion>mgas ISOLDEHRS beam I. Podadera Aliseda, 9-2-2005 ISOLDE workshop and users meeting

  7. ISCOOL: design parameters ISOHRS DUMP ISOHRS ? ISOLDE HV BEAM GATE 100 ms 1ms RFQ END PLATE collect RFQ SEGMENT 21 1,2 s Example of timing A. Jokinen et al, NIM B, 204, 86 (2003) Normal extraction “Kick” extraction ISOLDE workshop and users meeting

  8. ISCOOL: design parameters II Stopping distance ions (A=100) in He gas (A=4) M. Petersson, Master’s Thesis, IFM, 2002 • Pressure inside RFQCB chamber: 0.01-0.1 mbar (He). • 3 turbopumps (fully integrated in the ISOLDE vacuum system). • Differential pumping (from 0.1 mbar to 10-7 mbar). • Purified helium. ISOLDE workshop and users meeting

  9. ISCOOL: design parameters III Axial electrodes (for longitudinal axial electric field) and RF electrodes (to RFQ electric field) are separated Easy electronics 25 segments with individual power supplies Full control cooling and bunch extraction to the experiments ISOLDE workshop and users meeting

  10. Issues for the on-line installation • Off-line ion source before ISCOOL for optimization? • User’s beam gate removed but transparent for the users: same job by the beam gate before HRS. • Possibility to remove ISCOOL and work without with the injection and extraction quadrupole triplets. ISOLDE workshop and users meeting

  11. Status: The assembly • P. Delahaye took over the project since November. • Mechanical assembly finished. • Electrical vacuum connections finished. ISOLDE workshop and users meeting

  12. Status- II: The off-line test bench • Installation in 275: RF and vacuum in progress. • LPC ion source to be installed. • First tests planned with K1+ at low energy (1 keV). ISOLDE workshop and users meeting

  13. Planning • Tests until November 2006. • Installation at ISOLDE during next shutdown (HIE-ISOLDE). ISOLDE workshop and users meeting

  14. Acknowledgements Thanks to the institutions which have supported the project: C. Bachelet, E. Barbero, J. Billowes, K. Blaum, P. Butler, D. Carminati, R. Catherall, B. Cheal, N. Chritin, P. Delahaye, L. M. Fraile, K. Flanagan, T. Fritioff, T. Giles, J-F. Kepinski, O. Kester, J. Koivisto, A. Jokinen, J. Lettry, M. Lindroos, F. Locci, D. Lunney, E. Mané, S. Meunier, J. Parra-Lopez, M. Petersson, J. Pier-Amory, D. Porret, K. Riisager, K. Rudolph, T. Tallinen, F. Wenander… …my sincere apologies if I have forgotten someone… and thanks for your attention!!! ISOLDE workshop and users meeting

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