1 HBD HV Status Update Jason for the HBD crew Jan 30, 2007.
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Transcript of 1 HBD HV Status Update Jason for the HBD crew Jan 30, 2007.
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1
HBDHV Status Update
Jason
for the HBD crew
Jan 30, 2007
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WEST EAST
2
1
3
0
5
4
NORTH NORTHSOUTH SOUTH
26 Jan 2007Bertan Status
T : ----------------M: ----------------B : ----------------
T:~4μA @500VM: ----------------B : ----------------
T:~8μA @500VM: ----------------B : ----------------
T : ----------------M: ----------------B : ----------------
T:~4μA @500VM: ----------------B : ----------------
T:~7μA @534VM: ----------------B : ----------------
T:~15μA @520VM: ----------------B : ----------------
T : ----------------M: ----------------B : ----------------
T:~11μA @537VM: ----------------B : ----------------
T:410nA @535VM: ----------------B : ----------------
T:~12μA @524VM: ----------------B:~26μA @520V
T:~20μA @529VM: ----------------B : ----------------
T : ----------------M: ----------------B:~26μA @550V
T:~23μA @520VM: ----------------B : ----------------
T:~11μA @430VM: dead 20MΩB : ----------------
T : ----------------M: dead 20MΩB : ----------------
T : ----------------M: dead 20MΩB:~9μA @550V
T:~24μA @550VM: ----------------B : ----------------
T:~22μA @550VM: ----------------B : ----------------
T:~37μA @500VM: ----------------B : ----------------
T:700nA @500VM: ----------------B : ----------------
T : ----------------M: dead 20MΩB : ----------------
inf resistance 20MΩ
T:540nA @500VM:76μA @500VB:51μA @520V
T : ----------------M:~46μA @300VB : ----------------
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30 Jan 2007LeCroy 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?)
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4
Status as of Jan. 26, 2007
TOP MID BOT
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• ???
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T M B
5
Examples of Various GEM Behavior
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 – 15A at about ~500V) reflecting a GEM impedance of 16 – 140M.
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.
47 draw < 1nA on the way up to 520V.
T M B
T M B
T M B
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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?).
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EN012
EN0 EN1 EN2
TOP
MID
BOT
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EN345
EN3 EN4 EN5
TOP
MID
BOT
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ES012
ES0 ES1 ES2
TOP
MID
BOT
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EN345
ES3 ES4 ES5
TOP
MID
BOT
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WN012
WN0 WN1 WN2
TOP
MID
BOT
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WN345
WN3 WN4 WN5
TOP
MID
BOT
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WS012
WS0 WS1 WS2
TOP
MID
BOT
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WS345
WS3 WS4 WS5
TOP
MID
BOT
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TOP MID BOT TOP MID BOT
TOP MID BOT TOP MID BOT
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 – 15A at about ~500V) reflecting a GEM impedance of 16 – 140M.
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.