Booster Cavity 2002_3-7-2012.ppt - Fermilab

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Booster Cavity 2002_3-7-2012.ppt - Fermilab Powered By Docstoc
					First Refurbished Booster
    RF Cavity for 15Hz

        John Reid

       March 7, 2012
                                                                      f
                                                                  Fermilab




• Booster RF Cavity removed from Station 8
   – Removed October 3, 2011
   – This cavity was picked to be first for the following:
          • One of the lowest for radioactivity.
          • Cavity had a suspected small vacuum leak.
          • Cavity had performance issues when cold.
   – Shipped cavity to MI-60 for initial testing before
     disassembly.
   – Cavity moved into cave at MI-60 for high power testing.
   – Cavity leak checked and found to have a vacuum leak on
     upstream end flange.
   – Temporary repair was performed to allow cavity to under go
     initial testing at 15Hz.
   – Cavity run at 15Hz with reduced gradient to measure
     temperature rise of critical components.
                                     in Reid
          • Stem temperature > 200 FJohn 15 minutes running
 March 7, 2012                                                    2
         Leaking Cavity End Flange       f
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March 7, 2012        John Reid       3
                Standard Ferrite Tuner       f
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                Cavity End Cut Open       f
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       Bad Tuner Stem Connection       f
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                Burnt Tuner Cone       f
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March 7, 2012          John Reid   7
                Burnt Fingers on Cone       f
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March 7, 2012             John Reid     8
                Inside Center of Cavity       f
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         Anode Blocking Capacitor        f
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          Anode Blocking Capacitor        f
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March 7, 2012   John Reid   12
          Std Operating Waveforms                                    f
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                                 Phase Det Error – Light Blue
                                 Anode Prog – Purple –
                                 23kVpk
                                 RF Gap Envelope – Drk Blue
                                 PA Screen I - Green




March 7, 2012        John Reid                                  13
          Std Operating Waveforms                         f
                                                     Fermilab




                                    FBI – Yellow
                                    FBV – Green
                                    Plate I - Blue




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                Stem Temp vs Anode        f
                      Voltage        Fermilab




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                                                                f
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• Parameters at 23kV anode voltage @15Hz for 12 hours.
  –   Gradient ~52.9kV peak accelerating voltage
  –   Blocking capacitor temperature = 140 F
  –   High voltage filter chokes – 150 F
  –   Inside drift tube temperature = 145 F
  –   Drift tube temperature = 140 F
  –   Beam tube temperature (on Mu-metal shield) = 150 F
  –   Cavity outer shell temperature by PA = 114 F
  –   Ceramic window outer ring temperature = 106 F
  –   Ferrite Power removed to water = 5.9kW per tuner
  –   Back tuner stem temperature = 165 F
  –   Front tuner stem temperature = 175 F
  –   Bottom tuner stem temperature = 179 F
  –   Cavity vacuum = 1.17 x 10-7 Torr
  March 7, 2012                 John Reid                  16
                    Conclusions                                         f
                                                                   Fermilab




• Cavity does operate at 15Hz full gradient, BUT
      – Need to reduce stem temperatures
      – Elevated temperatures are in part due to a very small
        gap (0.001 to 0.002 inches) on stem vertical connection
        to center section.
      – Going to make a 0.005 inch tin gasket to help in sealing
        this high rf current connection.
• Want to do longer continuous running starting as
  soon as gaskets are installed.
• Consider installing cavity back in Station 8 before
  the end of March.




March 7, 2012                   John Reid                          17

				
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