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20% speed of light PowerPoint Presentation
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20% speed of light

20% speed of light

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20% speed of light

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  1. acceleration deflecting magnets focussing magnets Max. 90% speed of light 20% speed of light experiment UNILAC Primary Beam Intensity eff. puls width for injection: 47μs 36.2% efficiency 15.5% speed of light intensity[s-1]=0.5*intensity[spill-1] period of one revolution 4.7μs 10 turns will be accepted for injection acceleration: 0.5 s extraction: 1.0 s magnet resetting: 0.5 s

  2. 130μs 130μs 130μs > 200ms > 200ms UNILAC beam structure width of the beam pulse: 130μs repetition rate: >200 ms beam current of MEVVA source for 238U ions (73+): 900μA= =1.0•1010 particles/s beam energy: 11.4 MeV/u (v/c=0.155) MEVVA source for 238U ions (73+): 150μA=1.7•109 particles/s Penning source for 238U ions (73+): 30μA=3.3•108 particles/s

  3. 0.5s 0.5s SIS beam structure– single-shot injection eff. pulse width for injection: 47μs (36.2% efficiency) UNILAC v/c=0.155 SIS circumference: 216.720m period of one revolution: 4.7μs 10 turns will be accepted for injection time for acceleration: 0.5s beam extraction : 1-9s time for magnet resetting: 0.5s Standard Operation: dB/dt=1.3T/s → 1.38s SIS18 Modus: dB/dt=4T/s → 0.45s SIS12 Modus: dB/dt=10T/s → 0.12s Injection of 1 UNILAC beam pulse 1.0• 1010 particles Minimum time for acceleration, extraction and magnet resetting: 2s (spill-length) SIS beam:1.0•1010 •0.362/2=1.8•109 particles/s=3.6• 109 particles/spill

  4. 0.5s 0.5s SIS beam structure– multi-multi-turn injection eff. pulse width for injection: 47μs (36.2% efficiency) time for injection: 1-2s time for cooling: 3s time for acceleration: 0.5s beam extraction : 1-9s time for magnet resetting: 0.5s Injection of 10 UNILAC beam pulse 10•1.7• 109 particles (150μA) Minimum spill length: 6-7s SIS beam: 10•1.7• 109 •0.362/7=8.7• 108 particles/s multi-multi-turn injection 3.1• 108 particles/ssingle-turn injection The present currents reached from the high current injector and sources need no stacking by the electron-cooler If a future UNILAC source can fill SIS with 1 beam pulse up to the incoherent space charge limit (3•1010 particles/spill), the maximum theoretical 238U beam intensity is 1.5•1010 particles/s. (time for acceleration, extraction and magnet resetting is only 2s)

  5. Lifetime and Beam Loss -XHV is the key to heavy ion acceleration XHV ≡ extra high vacuum

  6. SIS– beam loss due to charge change