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An Alternative RCS Solution: RF Cycle 20 Hz / h=1

An Alternative RCS Solution: RF Cycle 20 Hz / h=1. RF Voltage is dominated by the required bunch area and not by Bdot -> Same RF voltage (60 kV ) works also at 20 Hz Example: Racetrack Lattice C= 107.7m (NB. No Circumference Restrictions for h=1).

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An Alternative RCS Solution: RF Cycle 20 Hz / h=1

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  1. An Alternative RCS Solution:RF Cycle 20 Hz / h=1 RF Voltage is dominated by the required bunch area and not by Bdot -> Same RF voltage (60 kV) works also at 20 Hz Example: Racetrack Lattice C= 107.7m (NB. No Circumference Restrictions for h=1) PSB BoosterEnergy Upgrade WG H. Schönauer

  2. LHC Beam (=Bunch) ParametersRCS Bunch = ~ 4 x final LHC Bunch • Np = 1.04 E12 • n, rms= 2.5 mm mrad in x,y • L = 1.6 eVs PSB BoosterEnergy Upgrade WG H. Schönauer

  3. Example RCS Lattice C = 107.712 m 16 Cells, Cell Tune = 2/7 LongSS D=D’=0, L=5.3m Bmax = 1.226 T B’max = 13.8 T/m Lbend = 3.4m Lquad = 0.5m PSB BoosterEnergy Upgrade WG H. Schönauer

  4. Magnet Cycle, RF Voltage Magnet Cycle: Sinusoidal , Rise Fraction =0.75 VRF=60 kV const. Fill Factor = 0.95 const. Field Law : p ~B RF Voltage (MV) dE/turn (MV) PSB BoosterEnergy Upgrade WG H. Schönauer

  5. Bunch Height, Bunching FactorSpace-Charge Tune Shift dQx, dQz VRF=60 kV const. Fill Factor = 0.95 const. Bunch 1/2height % Bunching Factor -dQx,-dQz PSB BoosterEnergy Upgrade WG H. Schönauer

  6. Some Arguments for Harmonic Number h=1 and higher Rep-rate PRO: • h = 1 is most flexible – can adapt to all future evolutions • h=1 -> circumference not bound to PS circumference numerology • RF frequency is within range of Finemet cavities • Linac4 structure capable of 50Hz • Only one bunch -> less space charge tune-shift for given bunch intensity • Relaxed rise time for extraction kickers OPEN questions: • Max. Bdot a problem for power converters? • Eddy currents – metallic vacuum chamber feasible? • ISOLDE limits? • ? PSB BoosterEnergy Upgrade WG H. Schönauer

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