1 / 12

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.

pavel
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related