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

GSI Helmholtzzentrum für Schwerionenforschung GmbH

ESR Status February 18, 2020

• first beam of C6+ 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

a total of 175 hours with beam was spent for machine development, less than half the recommissioning work (to achieve 2016 performance) is finished

• nly 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

Engineering Run Summary

GSI Helmholtzzentrum für Schwerionenforschung GmbH

Deceleration Cycle

0,00 10,00 20,00 30,00 40,00 50,00 60,00 70,00 80,00 90,00 100,00 2,50E+07 7,50E+07 1,25E+08 1,75E+08 2,25E+08

efficiency 50 cycles with cycle of 1 min. efficiency for deceleration of Ar18+ form 70 to 13 MeV/u

percentage of decelerated particles

number of injected particles

reliable deceleration and fast extraction over several hours in storage mode cycle time 1 minute efficiency decreases with number of injected particles