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Updated Resistivity measurement on Mm-Batch-4 Bakelite & RPC Bakelite sample measurements

The text discusses resistivity measurements on Mm-Batch-4 and RPC Bakelite samples, testing methods, electrode types, and challenges faced. It evaluates bulk resistivity, electrode performance, and charging times for accurate measurements.

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Updated Resistivity measurement on Mm-Batch-4 Bakelite & RPC Bakelite sample measurements

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  1. Updated Resistivity measurement on Mm-Batch-4 Bakelite & RPC Bakelite sample measurements 20-06-2011 Liang Guan TGRPC R&D Biweekly meeting

  2. Updated Mm-Batch-4 Bakelite Measurements 1

  3. Test Electrode Side view Top view Guarded electrode Carbon-film Guard electrode 2

  4. Long term stability 3 May,30th June,7th

  5. Bulk Resistivity vs. HV 4 * Current is read out within 2 min charging time.

  6. Charging Time T: 25.9C RH:31% U=500V 5

  7. TGRPC –Bakelite Sample Measurements 6

  8. Samples • 11 sample received from • Su MinFa @ June,17th 2011 • Phenolic plate with two melamine surfaces • 4 of the samples are ~2mm thick. • Other 7 samples are ~1mm thick. • Small size: 10 cm×10 cm • 2 two of the samples have brown color • Samples are numbered • BS-XXX-XX 7

  9. Thickness (1) 8

  10. Thickness (2) [mm] 9

  11. Surface condition (1)

  12. Surface condition (2)

  13. Surface condition (3)

  14. Surface condition (4) 13

  15. Bulk resistivity (1) • BS-001-01 sample is tested with • different methods (use sample resistor, Pico ammeter) • Pico ammeter calibration test: 3.075 MΩ test value: 3.2 MΩ • Comparison of measured resistivity: (use carbon film as electrodes, T=23.5C, RH:40%) 14

  16. Bulk resistivity (2) • different test electrode sizes • Note that the difference of the measured bulk resistivity value comes from the temperature difference, resistivity non-uniformity and charging time. But they still on the same order in the room temperature range (24-26 C) • different electrodes • Carbon film:(merit )very good contact with sample material, no pressure needed, reasonable measurement repeatability, (demerit ) hard to peel off from sample • Conductive rubber: sensitive to pressure Conductive rubber (2mm thick) • 3atm pressure is applied on test electrode for CMS Bakelite resistivity measurement • this means 64 kg weight on our ~20cm^2 test electrode • 45 kg weight on electrode tested, only get 1/20 of the current compared with the value obtained with carbon film electrode 15 Carbon film rubber filled with small conductive mental or carbon spheres

  17. Bulk resistivity (3) Current flowing through test plate as a function of charging time 16

  18. Bulk resistivity (4) * Measured with carbon film electrodes for shot time 17

  19. Summary & Outlook • Only one sample (BS-001-05) has the resistivity value in our interest range (<109Ω·cm) but Poor surface condition and Poor thickness uniformity • Strong dependence of bulk resistivity on temperature. Need further tests with each sample • Humidity study? • Charging time curve not very similar from sample to sample. Need further study. (30 min charging time seems OK for quick reference) 18

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