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HBD HV Status Update

HBD HV Status Update. Jason for the HBD crew Jan 30, 2007. 26 Jan 2007 Bertan Status. WEST. EAST. NORTH. SOUTH. NORTH. SOUTH. T:~7 μ A @534V M: ---------------- B : ----------------. T:~11 μ A @537V M: ---------------- B : ----------------. T:~12 μ A @524V M: ----------------

jenette-foley
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HBD HV Status Update

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  1. HBD HV Status Update Jason for the HBD crew Jan 30, 2007

  2. 26 Jan 2007 Bertan Status WEST EAST NORTH SOUTH NORTH SOUTH T:~7μA @534V M: ---------------- B : ---------------- T:~11μA @537V M: ---------------- B : ---------------- T:~12μA @524V M: ---------------- B:~26μA @520V T:~15μA @520V M: ---------------- B : ---------------- 5 T:~24μA @550V M: ---------------- B : ---------------- T:410nA @535V M: ---------------- B : ---------------- T:~20μA @529V M: ---------------- B : ---------------- T:~22μA @550V M: ---------------- B : ---------------- 4 T:~11μA @430V M: dead 20MΩ B : ---------------- T : ---------------- M:~46μA @300V B : ---------------- T : ---------------- M: ---------------- B:~26μA @550V T : ---------------- M: ---------------- B : ---------------- 3 T : ---------------- M: dead 20MΩ B : ---------------- T : ---------------- M: dead 20MΩ B:~9μA @550V T:~23μA @520V M: ---------------- B : ---------------- T:540nA @500V M:76μA @500V B:51μA @520V 2 T:~8μA @500V M: ---------------- B : ---------------- T : ---------------- M: ---------------- B : ---------------- T:~4μA @500V M: ---------------- B : ---------------- T:700nA @500V M: ---------------- B : ---------------- 1 T:~4μA @500V M: ---------------- B : ---------------- T:~37μA @500V M: ---------------- B : ---------------- T : ---------------- M: ---------------- B : ---------------- T : ---------------- M: dead 20MΩ B : ---------------- 0 inf resistance 20MΩ

  3. 30 Jan 2007 LeCroy Status • more-or-less consistentwith Bertan tests… • exceptions: • WN0, draws less current • inf res on 13.5M short • WS2, draws less current • 20M on mid (dead?) • 10M on 60M short • ES4, draws more current • 20M on 25M short • Many GEMs seem to improveover time. • WS3, EN2 draw high current and trip. • EN0 has a bad cable (maybe?)

  4. Status as of Jan. 26, 2007 • There are problems in 25 GEMs (out of 72): • 16 top • 5 middle • 4 bottom • Top GEMs… • are Au (not Cu) • thin (~300nm)CsI layer • only GEM truly exposed to HBD volume • only GEM touching the mesh’s frame • ??? MID BOT TOP

  5. Examples of Various GEM Behavior T B M 3 draw low current (410, 510, 777nA) at ~500V reflecting a very high GEM impedance (0.6 – 1.3 G). 9 draw high current (ranging from 3 – 15A at about ~500V) reflecting a GEM impedance of 16 – 140M. 47 draw < 1nA on the way up to 520V. T B M M B T T B M 10 have a dead (or almost dead) short and the 10M has been replaced by a 20. 4 seem to have multi-strip problems and the 10M has been removed.

  6. Summary • 25 of 72 GEMs have troubles of some kind • most (16) are top GEMs • Uniform distribution of problems is scary… • GEMs showing >20M could still be more than 1 strip! • 5 of 24 working modules (drawing appropriate current) • 2 of these have “dead 20M” shorts (resistors replaced) • Tentative plan for the run: • frequent MIP peak scans (calibrations) • swap out resistors (as needed) every access (every 2 weeks?).

  7. EN012 EN0 EN1 EN2 TOP MID BOT

  8. EN345 EN3 EN4 EN5 TOP MID BOT

  9. ES012 ES0 ES1 ES2 TOP MID BOT

  10. EN345 ES3 ES4 ES5 TOP MID BOT

  11. WN012 WN0 WN1 WN2 TOP MID BOT

  12. WN345 WN3 WN4 WN5 TOP MID BOT

  13. WS012 WS0 WS1 WS2 TOP MID BOT

  14. WS345 WS3 WS4 WS5 TOP MID BOT

  15. MID BOT TOP 3 draw low current (410, 510, 777nA) at ~500V reflecting a very high GEM impedance (0.6 – 1.3 G). 9 draw high current (ranging from 3 – 15A at about ~500V) reflecting a GEM impedance of 16 – 140M. TOP MID BOT TOP MID BOT TOP MID BOT 10 have a dead (or almost dead) short and the 10M has been replaced by a 20. 4 seem to have multi-strip problems and the 10M has been removed.

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