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High precision vacuum measurement system based on Bayard-Alpert ionization gauge

High precision vacuum measurement system based on Bayard-Alpert ionization gauge. System overview for LHC, system performance, first operational measurements and noise immunity (July 2009 – February 2010) G. Peñacoba 07/04/2011. Collector. Grid. I +. Filament. e -. e -. 10 V 5 A.

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High precision vacuum measurement system based on Bayard-Alpert ionization gauge

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  1. High precision vacuum measurement system based on Bayard-Alpert ionization gauge System overview for LHC, system performance, first operational measurements and noise immunity (July 2009 – February 2010) G. Peñacoba 07/04/2011

  2. Collector Grid I+ Filament e- e- 10 V 5 A 4 mA 1 pA Nude UHV Ionization Gauge G. Peñacoba

  3. Cable multi-conductor, single shielding Cable Triaxial (coaxial with double shielding) Filament-grid Control Profibus Communication Electrometer G. Peñacoba

  4. 200 m ~ 20 / LHC point G. Peñacoba

  5. 3 days Gauge 5R3 4 hours Gauge 7R1 Electrometer hacked for oscilloscope access Gauge 7R1 3.5 V 2.5 V 5 V 1.5 V 10 s 10 s 100 ms 10 s Gauge 6L8 G. Peñacoba

  6. Gauge 6L8 Rack side Original Gauge 6L8 Gauge 6L8 10 s Machine side - No Low Freq. - Stable reading G. Peñacoba

  7. Gauge 5R3 Original Rack side Double shielded Triax Gauge 5R3 10 s Machine side The contact of shielding and GND brings in the noise G. Peñacoba

  8. Gauge 5R3 (shield connected) 5 V 10 s Gauge 5R3 (shield disconnected) 1.5 V 10 s Disconnecting the shielding reduces the noise G. Peñacoba

  9. Rack side 3 V 5 V Gauge 7R1 10 s 10 s Gauge 5R3 Gauge 5R3 Gauge 7R1 0.5 V 0.5 V 10 s 10 s Machine side The capacitor box eliminates the noise G. Peñacoba

  10. Rack side 0.5 V Gauge 5R3 Gauge 5R3 2 0.5 V Contact to GND: Position 1 1 10 s Gauge 7R1 3 V Gauge 7R1 Contact to GND: Position 2 5 V 10 s Machine side Capacitor box within GND loop ensures clean signal G. Peñacoba

  11. Floating internal shielding Machine side G. Peñacoba

  12. TO BE CONTINUED … G. Peñacoba

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