Tuning of the first 805 MHz side-coupled cavity module for the Fermilab upgrade

The Module 1 side-coupled cavity with bridge couplers was given its final tuning during April 1990 in the low-level RF tuning lab. The pi /2 frequency with power iris cut is 805.001 MHz. The stop band is +246 kHz. Driven at the waveguide port, the reflected power is -45 dB (VSWR=1.01). The loaded Q is 9544. The individual cell field RMS deviation from average in each section is less than 1%. The average field in each section agrees with the theoretical value calculated. The peak field decreases 0.5% over the module length due to gap spacing as beta increases. The four sections were checked at a single temperature (keeping the pi /2 frequency constant). The field tilt from R1 end to R4 end was 5%.<>