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ISOLDE Technical report for INTC 21/5/2007

ISOLDE Technical report for INTC 21/5/2007. Mats Lindroos. Outline. Change of responsibilities at ISOLDE Shutdown work Off-line upgrade REX status Technical R&D at ISOLDE. New responsibilities at ISOLDE. Technical coordinator Richard Catherall REX ISOLDE superintendent Fredrik Wenander

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ISOLDE Technical report for INTC 21/5/2007

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  1. ISOLDETechnical report forINTC 21/5/2007 Mats Lindroos Mats Lindroos

  2. Outline • Change of responsibilities at ISOLDE • Shutdown work • Off-line upgrade • REX status • Technical R&D at ISOLDE Mats Lindroos

  3. New responsibilities at ISOLDE • Technical coordinator • Richard Catherall • REX ISOLDE superintendent • Fredrik Wenander • ISOLDE hall superintendent • Erwin Siesling • New projects and INTC matters • Mats Lindroos Mats Lindroos

  4. Major 2006/7 Shutdown tasks • Yearly facility maintenance: water and power (HT) • Instrumentation: migration to linux of scanners & wiregrids • Front-Ends: repair of the boris-tubes insulators (R. Catherall) • Mini-move: mini-ball into the extension 170 (D. Voulot) • REX maintenance: upgrades and repair (F. Wenander) • RFQ installation: prim pumps into HRS zone (E. Siesling) • Various work: laser windows, PLC update, ADC replace,etc. Mats Lindroos

  5. Improvement on the shutdown • Dedicated and responsible person appointed for each major task • Weekly technical shutdown meeting • Close follow-up and adaptation of the planning • Daily start-up meeting at beginning of the run Mats Lindroos

  6. Results • 2007 smooth start-up • No hardware failures or over-run of work • Expected software debugging (i.e. scanner & wiregrids applications) • BUT.. Unexpected (minor) controls problems (PS wide, AB/CO addressed) Mats Lindroos

  7. New magnet coils to replace old faulty coils Survey points for the alignment of the offline separator installed and documented New beam diagnostic chamber with mechanical slit system and “ISOLDE type” scanner installed Special thanks to Jerome Sarret, Erik Asen, Antony Newborough, Michel Duraffourg Off-line separator upgrade Mats Lindroos

  8. Automatic mass program 15 minutes for masses 0-160 with 0.1 mass unit resolution Labview based control system communicating directly to PLC’s via RPC server Response time: CCV to PLC <900ms Refresh rate 100ms Mats Lindroos

  9. REX low energy stage • Trap • Operational and in standby mode. Minor improvements during shutdown. Have delivered some stable beam to Witch. • EBIS • The general power cut in March partly vented the machine preventing us from doing further electron beam tests with the post anode. • The newly inserted cathode did not perform as expected and had to be exchanged.  • The machine is up running with a new cathode. Beam has been injected and extracted through the separator • The old control system has been exchanged to a AB supported system. • Still running with a temporary application programme Mats Lindroos

  10. Efficiencies for beams 2006 Tot. eff. = Trap × BTS × EBIS × Sep 27Al 116Cd 7Li 238U The constant “quest” for efficiency  REX low energy stage now covers A=7 to >200 with total efficiencies of at least 5%  High current beams can now be charge breed with some efficiency (e.g. 1.8% for a 3nA 7Li+ beam into 7Li3+)  Light ions still difficult to breed ≤5% -> Charge breeder : generally aiming for 10% total efficiency! -> Linac efficiency 70-85% (aim for >80% in 2007) Mats Lindroos

  11. Isotopes and elements run at REX so far… Mats Lindroos

  12. Installation in progress! New section Minimove - Phase 1 * Phase 1 = First phase of a full installation (linac upgrade, recoil separator, HIE-Isolde…) * Goals : 1. create space (linac upgrade, space around experiments) 2. improve shielding from X-ray background at Miniball 3. improve beam properties -> more focussing -> more beam diagnostics -> realignment of beamlines Mats Lindroos

  13. Beam optics calculation 9-GP to MB target • * 3MeV/u A/q3.5 • * 0.6π.mm.mrad normalised • * ±1% energy spread • Diploma Thesis by T. Arronsson Mats Lindroos

  14. Linac emittance measurements Results * Normalised transverse emittance (2σ RMS) = 0.21±0.07 π.mm.mrad at 2.2MeV/u * Low intensity few 100pA (no space charge effect in EBIS!) * Horizontal emittance larger than vertical after the bender (energy spread) * Emittance increased when going from 1.2 to 2.2 MeV/u (mismatch between IHS and 7gaps?) * Emittance increased with stripper foils Y direction after 2.5m drift 0.21 π.mm.mrad @ 2.2MeV/u Energy spread = ±0.03MeV/u @ 2.97MeV/u (±1%) Continuation 2007 * Verify results with uninterrupted measurement series * Verify influence of EBIS operation conditions on the emittance * Measure at 3MeV/u and 300keV/u Mats Lindroos

  15. Technical R&D at ISOLDE • Dual transfer lines • Merging of neutral beams • Mono ECR • Tendering for new solid state laser for RILIS • Progress on LARIS installation • ECR PHOENIX charge breeder development • RFQ cooler off-line commissioning Mats Lindroos

  16. CW 86Kr13+ 2.2% 132Xe18+ 1% Preliminary 4<A/q<8 h=2-7% Afterglow Results CW Pulsed 86Kr13+ Stable background DV tuning Background >5nA 2<A/q<7 P.Delahaye et al., RSI 77 03B105 (2006)

  17. ~5p·mm·mrad 90% emittance ~30p·mm·mrad 90% emittance as input RFQ cooler “ISCOOL” Continuous mode Emittance meter • Ongoing tests with the bunching mode • Last off-line tests with a FEBIAD source delivering noble gas ions RFQ cooler E. Mané, H. Frånberg, P. Delahaye Alkali ion source

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