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Hyoung Suk KIM KNU KOREA CCAST ILC Accelerator Workshop and

Design Status of IOT for ILC. Hyoung Suk KIM KNU KOREA CCAST ILC Accelerator Workshop and 1st Asian ILC R&D Seminar under JSPS Core University November 7 , 200 7. MBK(Multi-Beam Klystron) for ILC. 10MW MBK parameters. ILC RDR. 5MW IOT. 10MW MBK (64kV). 10MW SBK. Pros. and Cons.

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Hyoung Suk KIM KNU KOREA CCAST ILC Accelerator Workshop and

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  1. Design Status of IOT for ILC Hyoung Suk KIM KNU KOREA CCAST ILC Accelerator Workshop and 1st AsianILC R&D Seminar under JSPS Core University November 7, 2007

  2. MBK(Multi-Beam Klystron) for ILC 10MW MBK parameters ILC RDR

  3. 5MW IOT 10MW MBK (64kV) 10MW SBK

  4. Pros. and Cons.

  5. Output Input - - - - + + + + - + Klystron Electron Beam Velocity Modulation Cathode Collector overtemp Filament Focusing Body current - + Interlocks Modulator

  6. Output Collector Input Cathode overtemp Filament - + Body current Bias Voltage - + Interlocks Power Supply - + - + IOT Electron Beam Density Modulation

  7. What’s new? • Planar IOT (Inductive Output Tube) • Horizontal Design • L-band (1.3GHz) 5MW Tube • Calculation of Design Parameters • Feasible RF interaction Cavity

  8. i(t) C R V(t) Lumped-constant circuit Equivalent Circuit Approximation • Capacitance • from Gauss’ Law • Inductance • from Ampere’s Law • Resonance Frequency • Unloaded Q L

  9. HOM IOT S-parameters of L-band HOM IOT L-band HOM IOT Cavity Ez field in the interaction region f(cold)=1.1GHz (MAGIC) H field in the interaction region Ez field in the interaction region

  10. Design Specifications

  11. I I0 Electron Gun t 0 T/2 T 3T/2 2T 5T/2 Pre-modulated Electron Beam Pre-modulated electron beam in current v.s. time ; cut-off sinusoidal current which is used in class B operation, I = I0 MAX(sinwt, 0).

  12. Cavity Design cathode area = 300cm2 S-parameters of the RF resonator ; real (red) and imaginary (blue) values which shows us its cold frequency is 1.255GHz. (TM01-mode) Electric field intensity in RF resonator on the gap-centered cross section. This shows the cavity has TM01-mode where the resonator frequency is 1.255GHz in the absence of conductivity of cavity and electron beam.

  13. e- e- resonator grid 1 e- resonator grid 2 e- e- e- z 0 d ty t t ; snapshot time tx ; transit time ty ; departure time T0 ; gap (d) transit time t = ty + tx t-T0 tx 0 T0 Schematic Representation for Definition Schematic representation for the definition of snap shot time (t), transit time (tx) to z, departure time (ty).

  14. Electron Beam Dynamics in 1-D

  15. Output Power & Gap Field

  16. Gap Field & Efficiency From resonator field theory,

  17. SUMMARY • Design efforts for IOT (ILC) started. • This feasibility study to design IOT for ILC looks very positive. • Design parameters are calculated along with its performance. • Final electrical design will be released soon. And industrialization will be considered. (Toshiba,CPI,…) • After fund is available, more flexible design will be performed and more resources will be put in.

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