SNS Klystron Output DistortionSNS Klystron Output Distortion

THP099

M. McCarthy, M. Crofford, S. Kim

Managed by UT-Battellefor the Department of Energy

10-2-08

Ci l t

SNS SCL RF ArchitectureCirculator

Water

Directional Coupler

Load

To Cavity

Klystrons

2 Managed by UT-Battellefor the Department of Energy Presentation_name

Initial Klystron Fwd and Cavity Fwd Waveforms

Power Measured ~ 10us from end of

Open Loop

10us from end of pulse

cavity filling

Closed Loop Note different slopes on p

maintaining cavity field

peither side of the circulator

3 Managed by UT-Battellefor the Department of Energy Presentation_name

Waveguide Circulator and Modified Directional Coupler

FWDRFL

Phase

4 Managed by UT-Battellefor the Department of Energy Presentation_name

PhaseVariable attenuator

RF Pulse Spectrum: Normal & Parabolic

5 Managed by UT-Battellefor the Department of Energy Presentation_name

23b Cavity input full power normal bias

23b Cavity input full power parabolic shape

TCU bias adjustment using slope matching programslope matching program

Klystron Output

Klystron Output and Cavity Input after circulator bias coil current adjustment

Cavity Input

6 Managed by UT-Battellefor the Department of Energy Presentation_name

Cavity Input