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Design Status of IOT for ILC

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Presentation on theme: "Design Status of IOT for ILC"— Presentation transcript:

1 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, 2007

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

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

4 Pros. and Cons. Pros. Cons. Low cost Easy installation in the tunnel
No expensive modulator Economic maintainability No L-band yet Not easy to increase freq. Need fund to make prototype and industrialize

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

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

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 Equivalent Circuit Approximation
Lumped-constant circuit i(t) V(t) C R 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) Ez field in the interaction region H field in the interaction region

10 Design Specifications
Beam Voltage 55 kV (nom) Beam Current 123 A (nom) Frequency 1.3 GHz Gain - dB (min) Efficiency ~70 % (nom) Cathode Loading <1.0 A/cm2

11 Pre-modulated Electron Beam
I0 I Electron Gun 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 Schematic Representation for Definition
ty tx t T0 t-T0 t ; snapshot time tx ; transit time ty ; departure time T0 ; gap (d) transit time t = ty + tx e- resonator grid 1 grid 2 z d 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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