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Klystrons and RF Feed

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Klystrons and RF Feed. A. Moretti. March 15 , 2005. March 15-17, 2005 ... 325 MHz RF Distribution Layout and description. 1300 MHz RF Distribution Layout and ... – PowerPoint PPT presentation

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Title: Klystrons and RF Feed


1
Klystrons and RF Feed
  • A. Moretti
  • March 15 , 2005

2
Outline
  • Klystrons for the Proton Driver
  • 325 MHz RF Distribution Layout and description
  • 1300 MHz RF Distribution Layout and description
  • Conclusion

3
Layout of 0.5 MW Initial Linac
4
Klystrons
  • The 8 GeV Linac uses 12 Klystrons of 2 Types
  • 325 MHz JPARC Klystron (1-2 required for front
    end)
  • 1300 MHz TESLA Multi-Beam Klystron (11 required)
  • Both types are now Catalog Items

5
Toshiba E374A High Power Amplifier Klystron
Tube is designed for particle Accelerators Tube
tunable to 325 MHz Tube is in production for
J-Parc 17 tubes have recently been
delivered to J-Parc. Power Output 3.0 MW
Gain 50 dB
Efficiency 55 Duty Factor 2.6

Toshiba has verified to us that tube can meet
Baseline Specification of 4.5 ms at 2.5 Hz
and future requirement of 1.5 m.s 10 Hz
6
MBK Three Klystron Vendors
  • Thales Prototype in operation at DESY for
    18,000s hrs., 2 sent back because
  • of gun sparks-3000 hrs
    They have been modified and corrected, sent
  • back, met Spec at factory
    and no hint of problem at DESY. DESY has
  • ordered 8 more tubes.
    Cathode emission loading high compared to
  • other vendors predicted life
    of 40,000 hrs.
  • Looking at different
    dispenser Cathode materials for longer life.
  • CPI One tube has been shipped to DESY,
    Testing limited to 9 MW full
  • duty because of limitation
    factory PS, 58 efficiency measured,
  • study underway to increase
    efficiency, cathode Loading for long
  • life is low, tube has large
    Diameter.  
  • Toshiba RD phase has been tested to 10.3 MW , 1
    ms at 10 Hz needs PS
  • modification full pulse
    flattop length, low cathode Loading for long
    life.

7
Multi Beam Klystron THALES TH1801
Thales has verified to us that tube can meet
Baseline Specification of 4.5 ms at 2.5 Hz and
future requirement of 1.5 m.s 10 Hz.
8
CPI VKL-8301 MBK
9
Toshiba E3736 MBK
10
Klystron Pulse Width
  • The Initial Proton Driver scenario requires a
    4.5 msec RF pulse (3 msec beam pulse) at 2.5 Hz
  • Both Klystron manufacturers will deliver tubes to
    this pulse width, but cannot test this at the
    factory.
  • The 4.5 msec modulator being built for PD at SMTF
    will be used for this test.

11
1300 MHz RF Fanout
  • Fanout is nearly a copy of 361 TESLA RF fanout
  • Phase shifters used below 2 GeV
  • Components rated to handle Ultimate beam power

12
RF distribution 1300 MHz (Typical)


  • LL RF Drive
    Signal Input


  • 10 MW Klystron






  • Hybrid
    Coupler



  • Circulator
  • Load







Only used in the RD Phase
IQM Ferrite modulator




Phase Amplitude
One of 18 Cavities in Cryo Module
13
325 MHz RF System
14
RF Distribution 325 MHz (Typical)
Only used in the RD Phase
Hybrid Coupler
325MHz Klystron
Circulator
Load
IQM Ferrite Modulator




Phase Amplitude



















Cavity
15
Waveguide components near 1300 MHz Klystron at A0
Typical Components 5 MW at Output of the A0 High
Power Klystron Right Angle Bend
Straight Piece Flex Section
Directional Coupler

16
Typical Waveguide 1300MHz in A0
1300 MHz Coaxial Load Waveguide
Load 4 port Circulator 325 MHz
Components Available many Vendors.

17
High Power Components 1300 325 MHz
  • 5 MW Circulator Many vendors, Not used in the
    XFEL design
  • More Vendors Available for lower Power
    Circulators.
  • Hybrid Coupler Many vendors available High and
    low power, may require optimization for better
    specs in VSWR, etc.
  • Loads Many vendors available High and low power.
  • Other components Many vendors available High and
    low power.
  • IQM Vendor delivery in 2 months, High power,
    1300 MHz.
  • In House High and Low power _at_
    1300 325 MHz.

18
CONCLUSIONS
  • Components are commercially available from many
    Vendors to meet our requirements in a timely
    manner to complete the system as designed.
  • The only new component, the IQM for Phase and
    Amplitude control, is being developed both
    In-House Commercially. (see Terechkines talk)
  • The SMTF is a test bed for all the components and
    system will be used to test all components and
    qualify Vendors.
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