mode - CERN Accelerator School

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1. Four electrodes (vanes) between which we excite an RF Quadrupole Q p <strong>mode</strong> ( (TE210) ) → Electric focusing channel, alternating gradient with the period of the RF. RFQ Qpproperties p - 1 2. The vanes have a longitudinal g modulation with period = βλ → this creates a longitudinal component of the electric field. The modulation corresponds exactly to a series of RF gaps g p and can provide p acceleration. Opposite vanes (180º) Adjacent vanes (90º) + − − + + − 52
RFQ Qpproperties p - 2 3. The distance between peaks p of the modulation can be slightly adjusted to change the phase of the beam inside the RFQ cells, and the amplitude of the modulation can be changed to change the accelerating gradient → we can start at -90º phase p (linac) with some bunching g cells, progressively bunch the beam (adiabatic bunching channel), and only in the last cells switch on the acceleration acceleration. Longitudinal beam profile of a proton beam along the <strong>CERN</strong> RFQ2 RFQ2: ffrom a continuous ti beam b to t a bunched b h d accelerated beam in 300 cells. 53
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 and 24: Proton linac architecture - cell le
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: The Radio Frequency Quadrupole (RFQ
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

mode - CERN Accelerator School

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