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LEIR Status

LEIR Status. C. Carli on behalf of the LEIR team. Summary of what happened since the January “shutdown” Outlook until completion of LEIR commissioning. Summary of what happened since the January “shutdown”. Start with beam on February 9 th (still doubts on charge state)

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LEIR Status

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  1. LEIR Status C. Carli on behalf of the LEIR team • Summary of what happened since the January “shutdown” • Outlook until completion of LEIR commissioning LEIR Commissioning Status

  2. Summary of what happened since the January “shutdown” • Start with beam on February 9th (still doubts on charge state) • Delay due to beam (mainly source) not available (in the shadow ER.SMH40 installation) • Controls (still a lot of debugging): • OASIS (blocked very often), • LSA based programs (magnetic cycle and orbit):New version of magnetic cycle programs (new data base) -> several times not available • Working sets and knobs:FESA 2.7 to allow PPM copies on some DSCs, knobs improved • In general, good collaboration with CO experts. • Ion source still often unavailable despite lower current (agreed for reliability) • Again difficulties with the injection line : • Thought to have a good setting (beam looked nice after septa on ER.MTV12), • But the beam size and dispersion was large (collimated by septum ?), • New setting (new measurements at Linac 3 and correcting wrong quad scaling factors) allowed to improve (best injection efficiency > 40%). • Still some room for improvements. • First injection and circulating again easy (on February 15th), but difficulties to increase efficiency due to line matching • Transverse damper setting-up crucial for cooling & accumulation studies LEIR Commissioning Status

  3. Summary of what happened since the January “shutdown” • Electron Cooling: • First clear signs on March 3rd • Accumulation of 9E8 Pb54+ ionson March 10th Time evolution of longitudinal Schottky spectra Dense cooled beam large mom. spread just after injection Accumulation of about the nominal intensity - within 6s instead of 1.6s (without. collimation), - emittances (vertical ?) not yet measured, - life-time of 6.5 s after accumulation and with cooling. LEIR Commissioning Status

  4. Outlook until completion of LEIR commissioning • Less than five weeks left until scheduled completion !! • Still to be done : • Optimization of cooling and accumulation : • Good overlap of electrons and ions, • Prove vertical cooling, • Accumulation (two or three shots) to compensate low intensity from source. • Collimation and scrubbing • Acceleration (RF system and optics perturbation due to Eddy current effect), • Further injection line studies ? • Ejection (tricky ejection bump) • Transfer towards the PS: • Up to TV station just before PS injection hardware, • Verify matching in the ETL line (afterwards smooth optics – problems unlikely ?) • It looks difficult to complete LEIR commissioning until April 21st, but with a bit of good luck and a lot of effort, we still may make it. LEIR Commissioning Status

  5. Injection efficicecy with improved injection line : - based on new Linac 3 measurements and correcting quad scaling factors, - low and high momenta injected (smaller dispersion), - still a (small) improvement needed, => injection line studies should continue. back LEIR Commissioning Status

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