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Institute of Electronics, Chinese Academy of Sciences Beijing, China November 7, 2007

Institute of Electronics, Chinese Academy of Sciences Beijing, China November 7, 2007. The selection of operating mode for 10MW L-band MBK with high efficiency. Yaogen Ding, Yong Wang, Zhaozhuan Zhang. Introduction. The requirement of ILC 10MW L-band MBK Peak power: 10MW

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Institute of Electronics, Chinese Academy of Sciences Beijing, China November 7, 2007

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  1. Institute of Electronics, Chinese Academy of Sciences Beijing, China November 7, 2007 The selection of operating mode for 10MW L-band MBK with high efficiency Yaogen Ding, Yong Wang, Zhaozhuan Zhang

  2. Introduction The requirement of ILC 10MW L-band MBK Peak power: 10MW Average power: 150kW High efficiency for saving energy Long lifetime

  3. Introduction Recent progress of 10MW L-band MBK

  4. CPI VKL－8301 KEK and Toshiba E 3736 Thales TH 2108

  5. The choice of beam perveance Low beam perveance for getting high efficiency The relationship between efficiency and beam perveance η (%) = 90 − 20 × Per(μP)

  6. The choice of beam perveance Low frequency, high efficincy CW klystron 60～70％ of efficiency have been reached for klystron with beam perveance 0.6~0.9μP 。

  7. The choice of beam parameters The beam parameters for 10MW L-band MBK Beam Number: 6 Total beam perveance: 3.6μP Single beam perveance: 0. 6μP Beam voltage: 113kV (for efficiency of 65%) Beam current: 136.1A The beam parameters for 10MW L-band single beam klystron Beam perveance: 2.0μP Beam voltage: 158kV(for efficiency of 50%) Beam current: 126.6A Beam perveance: 0.6μP Beam voltage: 231kV(for efficiency of 65%) Beam current: 66.6A

  8. The choice of cathode loading The relationship between cathode loading and lifetime for M-type cathode Klystron (given by CPI) Emission current densityLifetime 2.0A/cm2, 145,000 hrs 4.0A/cm2, 85,000 hrs 8.0A/cm2, 27,000 hrs Life test evaluation of 411M cathode for highly reliable satellite TWTs Lifetime can reach 200,000 hrs.(given by NEC) Coated （Os）Impregnated Cathode, loading 4A/cm2，Temperature 9850C, Lifetime: 150.000 hrs. (IOT)。(Thales)

  9. The choice of focusing system • In order to obtain high peak power and high average power, high beam transmission for both DC and RF state is necessary. • Electromagnet focusing system is adopted for getting high beam transmission. • It is necessary to reduce the transverse field at the beam location for getting high beam transmission. • The distance from the axis to beam location have big influence on the weight and volume of tube and focusing system.

  10. The selection of operating mode Coaxial cavity TM010mode TM310 mode Cylinder cavity TM010 mode TM020 mode TM310 mode Rectangular cavity TM210 mode TM220 mode

  11. Cylinder cavity TM010 mode Diameter of cavity: 140mm Height of cavity: 50mm， Location of drift tube: 90mm Gap distance: 15mm Size of drift tube：Φ 16×Φ 24 Frequency:1316MHz R/Q=26.9(R=45), R/Q=30(R=35), R/Q=18(R=55), Radius of cathode：15~17.5mm Current density：3.2~2.36A/cm2 TM110 : F=1752MHz, 1754.8MHz TM210: F=2148.6MHz, 2150.8MHz

  12. Cylinder cavity TM310 mode Diameter of cavity:240mm Height of cavity: 70mm， Location of drift tube: 168mm Gap distance: 15mm Size of drift tube：Φ 20×Φ 28 Frequency:1346MHz R/Q=21.7(R=84), Radius of cathode：28~35mm Current density：0.92~0.59A/cm2

  13. Coaxial cavity TM010 mode Outer diameter of cavity: 150mm Inner Diameter of cavity: 40mm Height of cavity: 65mm， Location of drift tube: 90mm Gap distance: 12mm Size of drift tube：Φ 16×Φ 24 Frequency:1319MHz R/Q=26.2, Radius of cathode：28mm Radius of cathode：15~17.5mm Current density：3.2~2.36A/cm2 TM110 : F=1424MHz, 1427MHz TM210: F=1623MHz, 1625MHz

  14. Cylinder cavity TM020 mode Diameter of cavity:240mm Height of cavity: 70mm， Location of drift tube: 168mm Gap distance: 15mm Size of drift tube：Φ 20×Φ 28 Frequency:1685MHz R/Q=6.61(R=84), Radius of cathode：28~35mm Current density：0.92~0.59A/cm2

  15. Coaxial cavity TM010 mode Outer diameter of cavity:240mm Inner diameter of cavity: 90mm Height of cavity:60mm， Location of drift tube: 168mm Gap distance: 15mm Size of drift tube：Φ 20×Φ 28 Frequency:1316MHz R/Q=26(R=84), Radius of cathode：28~35mm Current density：0.92~0.59A/cm2 TM110， F＝1363MHz, 1366 MHz TM210， F＝1463MHz, 1467MHz TM310， F＝1520MHz,

  16. Rectangular cavity TM210 mode Size of cavity:220×57.5×50 Maximum distance among drift tubes: 162mm Gap distance: 15mm Size of drift tube：Φ 20×Φ 28 Frequency:1295MHz R/Q=24.76, (X=-26,Y=0), R/Q=27.93, (X=-13,Y=22.5), Radius of cathode：15~17.5mm Current density：3.2~2.36A/cm2 TM110， F＝1363MHz, 1366 MHz TM210， F＝1463MHz, 1467MHz TM310， F＝1520MHz,

  17. The selection of operating mode

  18. Multi-Beam Klystrons of IECAS

  19. C band MBK(IECAS) L band MBK(IECAS) S band MBK(IECAS)

  20. 100kW L-band CW MBK (IECAS ) A L-band 100 kW CW Broadband Multi-Beam Klystron with bandwidth of 12% is currently being developed at IECAS. The main design • 18 beams • 6 buncher cavities • Filter-loaded double-gap coupling cavity • Coil focusing The main technical difficulties • High CW output power • Wide bandwidth(12%) • Instability and oscillation of parasitic modes in CW state

  21. L-band high power klystron L-band high power klystron KL4003 Peak power：1MW Average power：100kW Technology properties： Hollow beam Anode modulation High power output window Supper evaporation collector

  22. L-band high power klystron KL4028 Peak power 3.5MW KL4038 Peak power 1.0MW

  23. S-band high power klystron KS4119 50MW KS4064 5MW, 15kW KS4121 1.8MW, 50kW

  24. Thanks！！！

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