Design Status of IOT for ILC

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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).

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.

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).

Electron Beam Dynamics in 1-D

Output Power & Gap Field

Gap Field & Efficiency From resonator field theory,

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.