Vacuum Gage Polling Logic

  1. History
        a. Individual Ion Gage Noise Caused RF Trips
        b. Unnecessary Beam Dumps and Downtime
        c. Vacuum Interlock Required to Prevent Coupler Damage
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  2. Vacuum Hardware Configuration
        a. One Ion Gage Per Cavity
        b. Large Conductance Between Cavities
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  3. Vacuum Performance
        a. 1.0e-9 to 5.0e-9 Torr. Base Pressure
        b. 5.0e-9 to 1.0e-8 Torr. Operating Pressure
        c. Cavity Pressure Interlocked at 5.0e-7 Torr
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  4. Modification
        a. Tie Interlock Relays in Adjacent Cavities Together
        b. Lower Cavity Pressure Interlock Level to 1.0e-7 Torr
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  5. Results
        a. No Spurious Ion Gage Vacuum Trips
        b. Improved RF System Reliability
        c. No Noted Damage to Cavity Components
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  6. Successfully Implemented in Booster 5-Cell Cavities With Two Gages Per Cavity.

vacuumspike.jpg
Ion Gage noise during conditioning.  Gage polling interlock logic prevents a spurious power trip