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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: ----------------

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HBD HV Status Update

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Hbd hv status update

HBD

HV Status Update

Jason

for the HBD crew

Jan 30, 2007


Hbd hv status update

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


Hbd hv status update

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?)


Status as of jan 26 2007

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


Examples of various gem behavior

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.


Summary

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?).


Hbd hv status update

EN012

EN0

EN1

EN2

TOP

MID

BOT


Hbd hv status update

EN345

EN3

EN4

EN5

TOP

MID

BOT


Hbd hv status update

ES012

ES0

ES1

ES2

TOP

MID

BOT


Hbd hv status update

EN345

ES3

ES4

ES5

TOP

MID

BOT


Hbd hv status update

WN012

WN0

WN1

WN2

TOP

MID

BOT


Hbd hv status update

WN345

WN3

WN4

WN5

TOP

MID

BOT


Hbd hv status update

WS012

WS0

WS1

WS2

TOP

MID

BOT


Hbd hv status update

WS345

WS3

WS4

WS5

TOP

MID

BOT


Hbd hv status update

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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