Argonne PowerPoint Presentation

1
KEK/ISIS/ANL LOI Amplifier/Second Harmonic RF
Collaboration Meeting
Tuesday, 26th of June, 2007 PAC07, Albuquerque,
NM
2
IPNS RCS RF System Block Diagram
3
Third Cavity Installed in L6 Straight Section
4
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

5
Final Plate Supply, Cavity Bias Supply and
Filament and Grid Supply Cabinet
Cavity Bias Supply 0 to 1000 A DC Final Grid
and Filament Cabinet
Final Plate Supply 8 kV, 24 A DC
6
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

7
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.

8
Results with Second Harmonic
Rectified fundamental and second harmonic gap
voltage.
Single-turn, vector sum of gap voltages, at 1.8
ms after injection.
Bunch profile without second harmonic, at 1.8 ms
after injection.
Bunch profile with second harmonic, at 1.8 ms
after injection.
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.
9
Future Plans