Plan for the extension of 12 month for JRA03

1. Plan for the extension of 12 month for JRA03 * Double frequency operation of PHOENIX at LPSC (chamber is now available, simpler setup than 28 GHz operation) * Further exploration of charge state manipulation and comparison with the new simulation tool CBSIM. * Efficiency exploration with BNL EBIS (can only be done in 2008) * Continuation of molecule break up and capture of decay products, which opens new possible beam development

2. Task 4: High-frequency exploration of ECRIS 4.1 Improving of breeding time of ECRIS already seen, to be measured systematically before interpratation 4.2 High frequency (14-28 GHz) exploration 28 GHz might be difficult before end 2008 4.3 Influence of ECRIS plasma volume Double frequency (14+18 GHz will be a good test) Modifications of the booster under fabrication, will installed by the end of September 2007

3. Afterglow Preglow Steady state Ar9+: 5 ms In ECR Charge state increase can be very fast ! -> But trapping very long ! RB1+ injection Rb15+ Afterglow Here 520 ms for Rb15+ Charge breeding time is a result of the ECRIS compromise, RF, B, Gas RF Power N. Chauvin et al., Nucl. Instrum. Meth. A, Vol 419, nb. 1, 1998 ECRIS charge breeders pulsed ECR charge breeding time LPSC 28 GHz, 3600 W 18 GHz, 950 W T. Thuillier et al., ICIS’07 Steady states reached at 3 ms for all charges !!

4. Shift of the charge state spectra to higher charge states Can be done by fast removalof hot low charged ions  cooling effect * In Bari  rf-excitation (BRIC) * MAXEBIS  reduced barrier * Uni Frankfurt  fast variation of electron beam current

5. Charge state manipulation methods? • Using atomic shell structure: Beneficial only for heavy ions until now (REXEBIS) Very high abundance in on charge states in EBIT, but at the expense of low efficiency • Using DR resonances: In principle possible (shown at Heidelberg EBIT), but efficiency spoiled by energy spread of the electron beam. • Cooling of highly charged ions: Works for medium heavy and heavy elements survey required

6. Simulation tool: CBSIM Included so far: Collision physics: Stepwise ionisation,charge exchange, RR Collision and trap physics: electron-ion-heating,ion-ion cooling Without charge exchange and recombination, but ion losses With charge exchange and recombination Included so far: Trap physics: space charge neutralisation andion losses Soon: atomic data tables

7. TOF out of the REXTRAP for stable SeCO beam injected Molecule breakup (EBIS) * Molecular sideband beams from ISOLDE to avoid isobaric contamination * e.g. 70SeCO to avoid 70Ge * Keep molecules inside trap, break them in EBIS (or break inside trap with different trap potential settings) Results * ~50% SeCO out of trap * 6.5% SeCO+ to Se19+ in EBIS (58 ms breeding time) * Problems inside the EBIS: ions with high electro-negative values escape the electron beam * Also tried SrF, BaF, AlF (>16% total efficiency for Al7+)

8. Gamma spectrum, 800ms trapping, 61Mn12+ and 61Fe12+ extracted Mn Mn cnts Fe Fe Fe Fe Fe Fe 0.71s 5.98m 1.65h From TOI, R.B. Firestone Energy (keV) 61Mn trapping and ejection • Measurement cycle: • RF on, plasma ignited • 61Mn injected into the ECR • RF is kept on for a time that can be varied (0s, 800ms…) • Ejection of the ions as a pulse

9. Emittance measurements ECRIS Two 1+ and two n+ identical emittancemeters are setup in the beam Line of LPSC and are working  RMS emittances absolute (20 kV*q) Xplane: 84Kr15+ Y plane: 84Kr15+ Xplane: 84Kr1+ Y plane: 84Kr1+ norm ~0.06 mm mrad norm. ~0.015 mm mrad