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Status of X-Band PPM Klystron R&D for JLC. KEK Yong Ho Chin ISG9 KEK December 10-13 , 2002. Status of PPM-3. KEK PPM-3 klystron (JFY2001) Goal: 60% efficiency by installing two 2nd-harmonic cavities. Revision of water cooling system at the penultimate cavity area.

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status of x band ppm klystron r d for jlc

Status of X-Band PPM Klystron R&D for JLC

KEK

Yong Ho Chin

ISG9

KEK

December 10-13 , 2002

status of ppm 3
Status of PPM-3
  • KEK PPM-3 klystron (JFY2001)
    • Goal:
      • 60% efficiency by installing two 2nd-harmonic cavities.
      • Revision of water cooling system at the penultimate cavity area.
    • High power testing started in March 2002.
    • A feedback system was also installed at the testing set-up to speed up the conditioning process.
    • Observations
      • The efficiency is slightly lower than PPM-2.
        • 2nd-harmonic cavities suspected.
      • The Kazakov windows-3 show far better performance than the previous ones.
        • Almost no light emission at 60MW.
        • Very fast conditioning at long pulse.
      • The improved water cooling system helps to reduce the temperature rise in the penultimate cavity region.
        • Below 30 degree rise at 100Hz operation.
slide3
Just after ISG8 in June, PPM-3 achieved
    • Output power 65MW
    • Pulse length 1.5ms
    • Efficiency 53%
    • Repetition rate 50Hz
  • However, we suffered from one problem after another since then…
    • Modulator power supply failed in June
    • Pulse transformer broke down in June
    • RF discharge in the load dragged the conditioning out through the fall 2002.
      • BINP load started to degrade and the stable operation became difficult to maintain due to the reflected power from the load.
      • After exchange to the “dry loads”, a right window broke down, seemingly by a too high voltage at the window due to the reflected power from the loads.
      • We did monitor the reflected power from the load, but did not feed back it to the input power to TWT.
status of other ppms
Status of Other PPMs
  • Remodeled PPM-2
    • PPM-2 has shown the best performance so far.
    • To explore its performance, PPM-2 was remodeled with
      • Kazakov-3 windows (= PPM-3)
      • Improved water cooling system (=PPM-3)
      • Retuned output cavity (=PPM-3)
    • PPM-2 was shipped to SLAC for further testing and will be installed to NLCTA if available.
  • KEK PPM-4 (JFY2002)
    • Temporarily cease the quest for higher efficiency at 56% and direct efforts to high repetition rate.
    • Combination of the RF design of PPM-2 and the mechanical design of PPM-3.
      • No 2nd-harmonic cavity
      • Further improved water cooling system
      • Kazakov window-3
      • Stick to the integrated PPM stacking
    • It is schedule to be delivered to KEK in early January 2003.
other activities
Other Activities
  • Loads
    • We need new robust loads to test PPM-4 at KEK
      • Two rectangular loads are expected from SLAC soon (in December or early January?)
      • Two TE01 loads available at Toshiba (left-over from SLAC 50MW PPM).
        • Two mode-converters (HP) are being built for the new Kazakov TE01-window.
        • We need just tapers to connect them.
  • New TE01-window
    • Just for the case that more robust windows are needed, we are developing a new TE01-window.
      • Kazakov’s talk
  • High power testing facility in the AR south
    • For testing of structures and other RF components, we are investigating a possibility to upgrade the existing but unused high power testing facility in the AR south to produce pulses with
      • 50-100MW output power
      • 400ns pulse length
      • 25-50Hz rep. rate
items to be discussed
Items to be discussed
  • When will SLAC loads arrive at KEK?
    • Their performance
    • A possibility to buy two more in next FY
  • How long and how much should we test PPM-4 at KEK before shipping it to SLAC?
    • 3 months?
    • Till 75MW, 1.6 ms, and 50Hz achieved?
  • Precise plan and schedule of PPM-2 and PPM-4 testing at SLAC.
    • February (PPM-2) and June (PPM-4).
  • Check the preparation status for PPM-2
    • PPM-2 and its all magnets (PPM and electric) were shipped to SLAC already.
    • Main lead shield will be shipped in December.
    • The rest (small stuffs) will follow as well.
  • Check the plan, schedule and preparation status for installation of PPM-2 and 4 to NLCTA.
  • Set up milestones for 2003 and 2004.
  • Contingency and back-up plan

Marc says that “do not worry”

January till the end of April

New date

SLAC TE01 window spare

Test

At SLAC

KEK TE01 window spare