L2 electronics status

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Here is reported the current status of Layer-2 electronics. Dead, noisy, strange, disconnected channels are listed with their explanation (when possible). The behavior of each TIGER of each GEMROC is reported, as well as the FEBs that show some issues and should be investigated.

Strips analysis[edit | edit source]

In this section, the status of L2 is analyzed from the strips point of view. The charge distribution of each strip is considered, allowing to spot the holes due to the microsectors (in order to remove them from the problematic channels), other missing strips and potential zones of high noise channels. The sections of the detector which are not between the two scintillators may be not fully included in this analysis due to the low statistics making it difficult to spot holes and other strange behavior. 

Notes:
1) The strips annotated with "microS" show low charge and fewer hits due to the micro-sector geometry. This has a periodic pattern (one each 15-16 strips) and is well known.
2) The strips annotated with "almost no charge (VERY LOW NOISE: DISCONNECTED???)" have very few events and very low charge (<5-10 fC), but the threshold scan is ok and the test-pulse is detected correctly, so the channel seems alive --> this has to be understood
3) The strips annotated with "L2 planar glueing" have very few events and very low charge (<5-10 fC), but the threshold scan is ok and the test-pulse is detected correctly, so the channel seems alive --> this has to be understood


STRIP-X[edit | edit source]

  type  STRIP n.   FEB  CHIP    ch
      X      1214    36     1    30	microS
      X      1198    36     2    42	microS
      X      1183    36     2    49	microS
      X      1182    36     2    26	microS
      X      1171    36     2     3	DISABLED DUE TO VERY HIGH NOISE				--> annotated in wiki
      X      1170    21     2     3	DISABLED DUE TO VERY HIGH NOISE				--> annotated in wiki
      X      1167    21     2     4	microS
      X      1152    21     2    59	microS
      X      1151    21     2    56	microS
      X      1149    21     2    52	high charge noise (STRANGE VTH SCAN: NO TP)		--> annotated in wiki
      X      1148    21     2    58	high charge noise (STRANGE VTH SCAN: NO TP)		--> annotated in wiki
      X      1136    21     1    24	microS
      X      1135    21     1    22	microS
      X      1120    35     1    36	microS
      X      1105    35     2    40	microS	
      X      1104    35     2    46	microS
      X      1099    35     2    59	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki	
      X      1089    35     2    14	microS
      X      1087    35     2    19	DEAD (VTH SCAN DEAD)					--> annotated in wiki, confirmed from Turin calibration
      X      1081    35     2     3	strange (VERY HIGH NOISE)				--> annotated in wiki
      X      1073    20     2    15	microS
      X      1058    20     2    58	microS
      X      1057    20     2    46	microS
      X      1047    20     1    20	strange (HIGH NOISE)					--> annotated in wiki (check grounding of this FEB)
      X      1046    20     1    24	strange (HIGH NOISE)					--> annotated in wiki
      X      1045    20     1    22	strange (HIGH NOISE)					--> annotated in wiki
      X      1044    20     1    2	strange (HIGH NOISE)					--> annotated in wiki
      X      1042    20     1     0	microS (VERY VERY HIGH NOISE)				--> annotated in wiki
      X      1040    20     1    16	strange (HIGH NOISE)					--> annotated in wiki
      X      1039    20     1    18	strange (HIGH NOISE)					--> annotated in wiki
      X      1027    34     1    2	microS
      X      1026    34     1    22	microS
      X      1011    34     2    50	microS
      X      1010    34     2    56	microS
      X       995    34     2    12	microS
      X       979    19     2    26	microS
      X       964    19     2    44	microS
      X       963    19     2    42	microS
      X       948    19     1    38	microS
      X       932    33     1    26	microS
      X       917    33     2    16	microS
      X       916    33     2    20	microS
      X       901    33     2     3	microS
      X       885    18     2    20	microS
      X       870    18     2    38	microS
      X       869    18     1    26	microS
      X       854    32     1    30	microS
      X       844    32     1    20	DEAD (VTH SCAN DEAD)					--> annotated in wiki, confirmed from Turin calibration (this FEB has also more noise, check grounding)
      X       838    32     2    42	microS
      X       823    32     2    49	microS
      X       822    32     2    26	microS
      X       807    17     2     4	microS
      X       802    17     2    14	OK
      X       801    17     2    60	high charge noise (HIGH NOISE)					--> annotated in wiki
      X       800    17     2    0	high charge noise (HIGH NOISE)					--> annotated in wiki
      X       791    17     2    56	microS
      X       776    17     1    24	microS
      X       775    17     1    22	OK
      X       760    31     1    36	microS
      X       744    31     2    46	microS
      X       729    31     2    14	microS
      X       728    31     2    15	OK
      X       713    16     2    15	microS
      X       697    16     2    46	microS
      X       682    16     1     0	microS
      X       681    16     1    36	OK
      X       666    30     1    22	microS
      X       650    30     2    56	microS
      X       635    30     2    12	L2 planar glueing
      X       634    30     2     4	L2 planar glueing
      X       633    30     2    22	L2 planar glueing
      X       632    30     2    11	L2 planar glueing
      X       631    30     2     3	L2 planar glueing
      X       613    29     2    28	almost no charge (VERY LOW NOISE: DISCONNECTED???)		--> annotated in wiki
      X       412    27     1     0	microS
      X       397    41     1     2	microS
      X       396    41     1    22	microS
      X       381    41     2    50	microS
      X       380    41     2    56	microS
      X       365    41     2    12	microS
      X       361    41     2     3	low statistics (QUITE HIGH NOISE: HIGH VTH)			--> annotated in wiki
      X       350    26     2     0	microS
      X       349    26     2    26	microS
      X       334    26     2    44	microS
      X       333    26     2    42	microS
      X       318    26     1    38	microS
      X       316    26     1    14	ok
      X       303    40     1    28	microS
      X       302    40     1    26	OK
      X       287    40     2    16	microS
      X       286    40     2    20	OK
      X       271    40     2     3	microS
      X       256    25     2    51	microS
      X       255    25     2    20	microS
      X       146    24     1    24	microS
      X       145    24     1    22	microS
      X       131    38     1    16	microS
      X       130    38     1    36	microS
      X       123    38     1    28	HIGH NOISE							--> annotated in wiki (FEB closer to noisy FEB)
      X       115    38     2    40	microS
      X        99    38     2    14	microS
      X        98    38     2    15	HIGH NOISE							--> annotated in wiki (FEB closer to noisy FEB)
      X        91    38     2     3	DISABLED DUE TO VERY HIGH NOISE					--> annotated in wiki (FEB closer to noisy FEB)
      X        90    23     2     3	low charge, less events (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      X        84    23     2    19	microS
      X        82    23     2    14	almost no charge (VERY LOW NOISE: DISCONNECTED???)		--> annotated in wiki
      X        68    23     2    58	microS
      X        29    37     2    36	DEAD (VTH SCAN DEAD)						--> This chip has 3 dead channels and 8 very very very high noise channels (check grounding, connector and then, if needed, replace FEB)

STRIP-V[edit | edit source]

  type  STRIP n.   FEB  CHIP    ch
      V      2082    22     1    50	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1851    19     1    50	DEAD (VTH SCAN DEAD) 					--> annotated in wiki, not dead in Turin calibration
      V      1849    19     1    57	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1775    18     1    52	DEAD (VTH SCAN DEAD) 					--> annotated in wiki, confirmed from Turin calibration
      V      1713    17     1    31	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1670    16     2    10	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1619    16     1    45	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1617    36     1    57	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1606    36     1    12	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1538    35     1    50	almost no charge (DEAD or communication problems?) 	--> FEB TO BE REPLACED
      V      1535    35     1     8	almost no charge (no TP) 				--> FEB TO BE REPLACED
      V      1495    35     1    42	almost no charge (no TP) 				--> FEB TO BE REPLACED
      V      1474    35     2    25	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V      1233    32     2    45	almost no charge (QUITE LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       925    28     1    57	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       856    27     1    10	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       823    26     2    10	DEAD or calibration? (VTH SCAN OK)			--> wrong calibration with dead channel
      V       653    24     1    44	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       623    24     1    21	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       619    24     1    50	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       617    24     1    57	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       543    23     1    52	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       542    23     1    50	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       539    43     1    57	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       463    43     2    45	DISABLED DUE TO VERY HIGH NOISE				--> anode tail damaged
      V       427    42     1    56	almost no charge (VERY LOW NOISE: DISCONNECTED???)	--> annotated in wiki
      V       405    42     2    53	less charge (VERY LOW NOISE: DISCONNECTED???)		--> annotated in wiki
      V       318    41     2     9	DEAD (VTH SCAN OK)					--> check calibration (GEMROC with reset issues)
      V       309    41     2    45	almost no charge (VTH SCAN OK)				--> check calibration (GEMROC with reset issues)
      V        76    37     1    45	DEAD (VTH SCAN DEAD)					--> This chip has 5 dead channels and 10 very very very high noise channels (14/15 are close on the anode-FEB connector) --> check connector and then, if needed, replace FEB

Channels analysis[edit | edit source]

In this section, the status of L2 is analyzed from the electronics point of view. The threshold scan and calibration files of each channel are considered, allowing to spot noisy and dead channels. In addition, some channels showing a lower than expected noise are annotated. 

Note: channels in bold are close on the FEB-anode connector, therefore are also contiguous strips.


GEMROC 4[edit | edit source]

TIGER number Notes Action
TIGER 0 1 channel (45) with too low noise
TIGER 1 1 channel (10) with too low noise
TIGER 2 1 channel (31) with too low noise
TIGER 3 2 noisy channels (0, 60)
TIGER 4 1 dead channel (52, already dead in Turin)
TIGER 5 ok
TIGER 6 1 dead channel (50, was ok dead in Turin)

1 channel (57) with too low noise

TIGER 7 1 noisy channel (3)


GEMROC 5[edit | edit source]

TIGER number Notes Action
TIGER 0 almost all channels are more noisy check grounding, connector, then replace FEB
TIGER 1 almost all channels are more noisy check grounding, connector, then replace FEB
TIGER 2 ok
TIGER 3 1 noisy channel (3)

2 channels (52, 58) with strange vth scan (no TP/high noise)

TIGER 4 1 channel (50) with too low noise

2 channels (26, 28) with strange vth scan (no TP/high noise)

TIGER 5 ok
TIGER 6 1 noisy channel (26)

2 channels (50, 52) with too low noise

TIGER 7 2 channels (3, 14) with too low noise

GEMROC 6[edit | edit source]

TIGER number Notes Action
TIGER 0 4 channels (21, 44, 50, 57) with too low noise
TIGER 1 1 noisy channel (3)
TIGER 2 ok
TIGER 3 1 noisy channel (3)
TIGER 4 ok (had wrong calibration) charge measurement has been re-equalized on-detector, check if OK otherwise replace FEB for calibration
TIGER 5 ok (had wrong calibration) charge measurement has been re-equalized on-detector, check if OK otherwise replace FEB for calibration
TIGER 6 1 channel (10) with too low noise
TIGER 7 1 noisy channel (3)

2 channels (16, 20) with strange vth scan (no TP/high noise)


GEMROC 7[edit | edit source]

TIGER number Notes Action
TIGER 0 1 channel (57) with too low noise
TIGER 1 ok
TIGER 2 1 channel (58) with too low noise (maybe)
TIGER 3 1 noisy channel (3)

1 channel (28) with too low noise

TIGER 4 ok
TIGER 5 3 channels (40, 46, 48) with strange vth scan (no TP/high noise)
TIGER 6 ok
TIGER 7 1 noisy channel (3)


GEMROC 8[edit | edit source]

TIGER number Notes Action
TIGER 0 12 noisy channels

1 dead channel (20, already dead in Turin)

check grounding, connector, then replace FEB
TIGER 1 lots of noisy channels

1 channel (45) with too low noise

check grounding, connector, then replace FEB
TIGER 2 ok
TIGER 3 4 noisy channels (0, 3, 4, 60) may be due to TIGER 0-1
TIGER 4 ok
TIGER 5 1 noisy channel (3)
TIGER 6 missing TP for all all channels

1 "almost" dead channel (50, was ok in Turin)

replace FEB
TIGER 7 1 dead channel (19, already dead in Turin)

2 channels (25, 59) with too low noise

1 noisy channel (3)

replace FEB

GEMROC 9[edit | edit source]

TIGER number Notes Action
TIGER 0 2 channels (12, 57) with too low noise
TIGER 1 1 noisy channel (3)
TIGER 2 lots of noisy channels

5 dead channels

check grounding, connector, then replace FEB
TIGER 3 lots of noisy channels

3 dead channels

check grounding, connector, then replace FEB
TIGER 4 lots of noisy channels re-test after improving TIGER 2-3
TIGER 5 lots of noisy channels re-test after improving TIGER 2-3
TIGER 6 ok
TIGER 7 4 noisy channels (0, 3, 4, 12)

GEMROC 10[edit | edit source]

TIGER number Notes Action
TIGER 0 ok
TIGER 1 1 noisy channel (3)
TIGER 2 ok
TIGER 3 1 noisy channel (3)

2 strange channels (9,45, dead/low charge from cosmics but vth scan is ok)

Check new data
TIGER 4 1 channel (56) with too low noise
TIGER 5 1 channel (53) with too low noise
TIGER 6 1 channel (57) with too low noise
TIGER 7 22 channels with very low noise (anode tail damaged)

2 noisy channels (45, 58)

Summary[edit | edit source]

Here a summary of this analysis is reported.

  • DEAD CHANNELS = 13, where:
    • already dead in Turin = 3
    • died after Turin = 2 --> one is on a FEB that needs to be replaced (FEB_label=35)
    • related to connector issues = 8 (also lots of noisy channels close to each other)
  • NOISY CHANNELS = 30 (approx., after removing problematic FEBs), where:
    • channel 3 of chip 2 (which is at the edge of the anode-FEB connector) is the most recurrent one
  • CHANNELS WITH TOO LOW NOISE = 25 (approx., damaged anode tail channels not counted)
    • in the cosmic ray acquisition, these channels have a very low number of hits (and a very low charge), but the threshold scan is OK and the test-pulse is detected correctly, so the channel seems alive --> THIS NEEDS TO BE UNDERSTOOD
  • CHANNELS WITH FEW EVENTS AND LOW CHARGE NEAR THE PLANAR GLUEING = 5, where:
    • FEB_label = 30, chip 2
    • channels: 3, 11, 22, 4, 12 (threshold scan is OK, so the channels are alive)
    • strips: 631, 632, 633, 634, 635



FEBs to be investigated[edit | edit source]

List of FEBs that need to be checked:

  • FEB_label = 20 (GEMROC 5, TIGER 0-1, HW_FEB = 9)
    • high noise level
    • TO-DO: check grounding, bonding, anode-FEB connector (both sides)
    • IF NO ANOMALIES FOUND replace FEB
  • FEB_label = 26 (GEMROC 6, TIGER 4-5, HW_FEB = 5) -----> REPLACED HW_FEB = 50
    • had wrong calibration, now the channel response has been equalized through an "on-detector calibration"
    • TO-DO: check if new data (charge distribution) is ok
    • IF STILL NON-UNIFORMITY IS PRESENT replace FEB and calibrate
  • FEB_label = 32 (GEMROC 8, TIGER 0-1, HW_FEB = 30)
    • high noise level
    • TO-DO: check grounding, bonding, anode-FEB connector (both sides)
    • IF NO ANOMALIES FOUND replace FEB
  • FEB_label = 35 (GEMROC 8, TIGER 6-7, HW_FEB = 29) -----> REPLACED HW_FEB = 56
    • one chip without TP
    • TO-DO: check bonding, replace FEB
  • FEB_label = 37 (GEMROC 9, TIGER 2-3, HW_FEB = 11) -----> REPLACED HW_FEB = 57
    • high noise level
    • TO-DO: check grounding, bonding, anode-FEB connector (both sides)
    • IF NO ANOMALIES FOUND replace FEB
  • FEB_label = 38 (GEMROC 9, TIGER 4-5, HW_FEB = 12)
    • high noise level (could be due to FEB 37)
    • TO-DO: first check if after removing FEB 37 the noise decreases
    • TO-DO: otherwise check grounding, bonding, anode-FEB connector (both sides)
    • IF NO ANOMALIES FOUND replace FEB
  • FEB_label = 43 (GEMROC 10, TIGER 6-7, HW_FEB = 3)
    • anode tail damaged
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