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Sequence q of PIMS cavities Cells have same length inside a cavity (7 cells) but increase from one cavity to the next. At high g energy gy (>100 ( MeV) ) beta changes g slowly y and phase p error (“phase ( p slippage”) pp g ) is small. 160 MeV, 155 cm 100 MeV, 128 cm Focusing quadrupoles bbetween t cavities iti (v/c)^2 PIMS range g 0 0 100 200 300 Kinetic Energy [Me 22
Proton linac architecture – cell length, length focusing period EXAMPLE: the Linac4 project at <strong>CERN</strong>. H-, 160 MeV energy, 352 MHz. A 3 MeV injector + 22 multi-cell standing wave accelerating structures of 3 types DTL: every cell is different, focusing quadrupoles in each drift tube CCDTL: sequences of 2 identical cells, quadrupoles every 3 cells PIMS: sequences of 7 identical cells, quadrupoles every 7 cells Injector Two basic principles to remember: 1. As beta increases, phase p error between cells of identical length becomes small → we can have short sequences q of identical cells (lower construction costs). 2. As beta increases, the distance between focusing elements can increase (more details in 2nd lecture!). 23
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: eam Multigap linac structures: the
Page 25 and 26: Multi-gap Superconducting linac str
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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