ESR Status February 18, 2020 first beam of C 6+ 400 MeV/u was stored - PowerPoint PPT Presentation

ESR Status February 18, 2020 first beam of C 6+ 400 MeV/u was stored and cooled last Friday, • ESR could not continue due to adverse effects on other users • after establishing stable beam conditions ESR operation continued Tuesday afternoon with commissioning of stochastic cooling system • no tests with beam for user operation were possible for lack of time GSI Helmholtzzentrum für Schwerionenforschung GmbH

Engineering Run Summary a total of 175 hours with beam was spent for machine development, less than half the recommissioning work (to achieve 2016 performance) is finished • only a few aspects required for 2020 user beamtime could be tested e.g. deceleration of highly charged ions still has to be developed incl. stochastic cooling • storage ring mode worked satisfactorily, but ESR operation in this mode still has to be learned • various beam diagnostic tools are under developments, but only as expert tools, not for routine operation • response time of control system is not satisfactory ⇒ setting up and tuning for user operation will require increased time • read back of actual values would be useful for efficient operation and precise machine monitoring during user operation GSI Helmholtzzentrum für Schwerionenforschung GmbH

Deceleration Cycle 50 cycles with cycle of 1 min. efficiency for deceleration of Ar 18+ form 70 to 13 MeV/u efficiency percentage of decelerated particles 100,00 90,00 80,00 70,00 60,00 50,00 reliable deceleration and fast 40,00 extraction over several hours 30,00 in storage mode 20,00 cycle time 1 minute 10,00 0,00 efficiency decreases with 2,50E+07 7,50E+07 1,25E+08 1,75E+08 2,25E+08 number of injected particles number of injected particles GSI Helmholtzzentrum für Schwerionenforschung GmbH