KEK/ISIS/ANL LOI Amplifier/Second Harmonic RF Collaboration Meeting
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Transcript of KEK/ISIS/ANL LOI Amplifier/Second Harmonic RF Collaboration Meeting
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KEK/ISIS/ANL LOI Amplifier/Second Harmonic RF Collaboration Meeting
Tuesday, 26th of June, 2007
PAC07, Albuquerque, NM
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IPNS RCS RF System Block Diagram:
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Third Cavity Installed in L6 Straight Section:
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Third Cavity and Final Amplifier:
Final amplifier uses two Eimac 3CW150000H3 water-cooled power triodes in a grounded-grid, cathode-driven, push-pull topology.• Operated Class A.• Plate power supplied by an 8 kV, 24 A DC power supply.• Typical operating point:
•Vplate = 8 kVDC•Vgrid = -320 VDC• Zero-signal plate current/tube ~ 5 A
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Final Plate Supply: 8 kV, 24 A DC Cavity Bias Supply: 0 to 1000 A DC
Final Grid and Filament Cabinet
Final Plate Supply, Cavity Bias Supply and Filament and Grid Supply Cabinet:
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Predriver and Driver Amplifiers:
Predriver amplifier uses two Eimac YU-106 water-cooled power triodes in a grounded-grid, cathode-driven, push-pull topology.• Operated Class A.• Plate power supplied by a 5 kV, 4 A DC power supply.• Typical operating point:
• Vplate= 5 kVDC• Vgrid = +35 VDC• Zero-signal plate current/tube ~ 1 A
Driver amplifier uses two Eimac 4CW25000A water-cooled power tetrodes in a grid-driven, push-pull topology. • Operated Class A.• Plate power supplied by a 5 kV, 10 A DC power supply.• Typical operating point:
• Vplate = 5 kVDC• Vscreen = 1.5 kVDC • Vgrid = -300 VDC• Zero plate current/tube ~ 3 A
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Timeline:• Summer Shutdown, 2005: Disassembled test stand and moved equipment into place.
• Winter Shutdown, 2005-2006: Installed third cavity in RCS.
• March, 2006: Operated all three cavities with beam (3rd cavity operated in fundamental mode).
• Septemember, 2006: Operated 3rd cavity in second harmonic mode (for first ~4ms of cycle) with beam.
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3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 170
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Fundamental Rectified Gap VoltageSecond Harmonic Recitified Gap Voltage
Cycle Time (ms)
Rec
tifie
d G
ap V
olta
ge (
kV)
Vfi
V2fi
T i( )
0 90 180 270 3601.5
1
0.5
0
0.5
1
1.5
Fundamental Gap VoltageSecond Harmonic Gap VoltageTotal Vector Sum Gap Voltage
Degrees
Volta
ge (R
elat
ive
Uni
ts) Vf
t
V2ft
VTotalt
t
Time
Injection
Mountain range plot starting at injection without second harmonic, duration ~4 ms.
Mountain range plot starting at injection with second harmonic, duration ~4 ms.
Bunch profile without second harmonic, at ~1.8 ms after injection. Bunch profile with second harmonic, at ~1.8 ms after injection.
Rectified fundamental and second harmonic gap voltage. Single-turn, vector sum of gap voltages, at ~1.8 ms after injection.
Results with Second Harmonic:
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Future Plans: