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Proton linac architecture – Shunt impedance A third basic principle: Every yp proton linac structure has a characteristic curve of shunt impedance (=acceleration efficiency) as function of energy, which depends on the <strong>mode</strong> of operation. p 3MeV 50MeV 100MeV 160MeV DTL Drift Tube Linac 18.7 m 3 tanks 3 klystrons CCDTL PIMS Cell-Coupled Drift Tube Linac 25 m 7 tanks 7 klystrons Pi-Mode Structure 22 m 12 tanks 8 klystrons The choice of the best accelerating structure for a certain energy range g depends p on shunt impedance, p but also on beam dynamics and construction cost. 24
Multi-gap Superconducting linac structures (elliptical) Standing wave structures for particles at β>0.5-0.7, widely used df for protons (SNS (SNS, etc.) ) and electrons (ILC, etc.) f=350-700 MHz (protons), f=350 MHz – 3 GHz (electrons) Ch Chain i of f cells ll electrically l t i ll coupled, l d large apertures (ZT2 not a concern). Operating in π-<strong>mode</strong>, cell length βλ/2 IInput t coupler l placed l d at t one end. d 25
Page 1 and 2: Introduction to RF Linear Accelerat
Page 3 and 4: (v/c)^2 ( 1 Proton and Electron Vel
Page 5 and 6: Example: Superconducting Proton Lin
Page 7 and 8: RF input λ p TM01 field configurat
Page 9 and 10: Slowing down waves: the disc- loade
Page 11 and 12: eam Traveling wave linac structures
Page 13 and 14: mode 0 mode π/2 mode 2π/3 mode π
Page 15 and 16: Comparing traveling and standing wa
Page 17 and 18: Disc-loaded structures operating in
Page 19 and 20: Examples p of DTL Top; CERN Linac2
Page 21 and 22: eam Multigap linac structures: the
Page 23: Proton linac architecture - cell le
Page 27 and 28: Quarter Wave Resonators Simple 2-ga
Page 29 and 30: Focusing solenoids Examples: p an e
Page 31 and 32: Electron linac architecture EXAMPLE
Page 33 and 34: Heavy y Ion Linac Architecture EXAM
Page 35 and 36: Longitudinal g dynamics y → Ions
Page 37 and 38: Transverse dynamics - Space charge
Page 39 and 40: Transverse equilibrium in ion and e
Page 41 and 42: x_rms beaam size [m] High-intensity
Page 43 and 44: 55. DDouble bl periodic i di accele
Page 45 and 46: Mechanical errors differences in f
Page 47 and 48: The Side Coupled p Linac To operate
Page 49 and 50: The Cell-Coupled Drift Tube Linac W
Page 51 and 52: The Radio Frequency Quadrupole (RFQ
Page 53 and 54: RFQ Qpproperties p - 2 3. The dista
Page 55 and 56: How to create a quadrupole RF mode
Page 57 and 58: Electron sources: give energy to th
Page 59 and 60: Accelerating structure: the choice
Page 61 and 62: Mains Transforms mains power into D
Page 63: Bibliography g p y 1. Reference Boo

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