1

ROC without “floating” wires

C16 IROC anomalous anode wires

C02 IROC anomalous anode/edge wire

C04 OROC anomalous anode wires

Test of readout chambers – Summary of C side

C05 IROC anomalous anode wire

C06 OROC floating gating grid wire

Readout Chambers under further investigation

ROC with “floating” wire(s) either anode or gg

C07

C08

C05 OROC anomalous anode wire

C05

C09

C10

C07 OROC anomalous anode wire C08 OROC anomalous anode wire

C11

C12

2

C00 - IROC

Va = 1350 V Va = 1380 V

Va = 1420 V

3

C00 - OROC

Va = 1550 V Va = 1600 V

Va = 1650 V

4

C00 - GAIN

5

C01 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

6

C01 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

7

C01 - GAIN

8

C02 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

9

C02 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

10

C02 - GAIN

11

C03 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

12

C03 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

13

C03 - GAIN

14

C04 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

15

C04 - OROC

Va = 1600 V Va = 1650 V

16

C04 - GAIN

17

C05 - IROC

Va = 1350 V

Va = 1380 V

Va = 1390 V

18

C05 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

19

C05 - GAIN

20

C06 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

gain variation ±17%

21

C06 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

gain variation ±21%

22

C06 - GAIN

23

C07 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

gain variation ±14%

24

C07 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

gain variation ±14%

25

C07 - GAIN

26

C08 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

gain variation ±17%

27

C08 - OROC

Va = 1600 V

Va = 1650 V

Va = 1670 V

28

C08 - GAIN

1670V

29

C09 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

gain variation ±20%

30

C09 - OROC

Va = 1600 V

Va = 1650 V

Va = 1700 V

gain variation ±20%

31

C09 - GAIN

32

C10 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

gain variation ±15%

33

C10 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

gain variation ±12%

34

C10 - GAIN

35

C11 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

gain variation ±11%

36

C11 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

37

C11 - GAIN

38

C12 - IROC

Va = 1350 V Va = 1380 V

Va = 1430 V

gain variation ±15%

39

C12 - OROC

Va = 1600 V Va = 1650 V

Va = 1700 V

gain variation ±24%

40

C12 - GAIN

41

C13 - IROC

Va = 1350 V Va = 1400 V

Va = 1430 V

42

C13 - OROC

Va = 1550 V Va = 1600 V

Va = 1650 V

43

C13 - GAIN

44

C14 - IROC

Va = 1350 V Va = 1400 V

Va = 1430 V

45

C14 - OROC

Va = 1550 V Va = 1600 V

Va = 1650 V

46

C14 - GAIN

47

C15 - IROC

Va = 1350 V Va = 1380 V

Va = 1420 V

48

C15 - OROC

Va = 1550 V Va = 1600 V

Va = 1650 V

49

C15 - GAIN

50

C16 - IROC

Va = 1350 V Va = 1380 V

Va = 1400 V

51

C16 - OROC

Va = 1550 V Va = 1600 V

Va = 1650 V

52

C16 - GAIN

53

C17 - IROC

Va = 1350 V Va = 1380 V

Va = 1420 V

54

C17 - OROC

Va = 1550 V Va = 1600 V

Va = 1650 V

55

C17 - GAIN

56

-20

-10

0

10

20

30

40

50

60

70

80

90

100

C00 C01 C02 C03 C04 C05 C06 C07 C08 C09 C10 C11 C12 C13 C14 C15 C16 C17

Vm

ax

- V

no

m (

Vo

lt)

IROCs Vmax - Vnom OROC's Vmax - Vnom

IROC's Vmax_meas - Vnom OROC's Vmax_meas - Vnom

Summary - gain

57

Sector IROC pad row with gain excess

OROCpad row with gain excess

C02 1 -

C04 53, 54, 60, 64, 68 -

C05 33, 34 37,38

C06

C07 - 51, 52

C08 - 11, 12, 13, 15, 16, 59, 60, 64, 65, 66

C16 4, 39

Summary – “floating” anode wires

58

Va = 1600 V Va = 1650 V

Example (worst) of a ROC with anomalous anode wire – C04 OROC

Signal in pad row 61 is 4 x nominal amplitude!

However, it reduces with time of operation see next slide

Further measurements and simulations in progress

59

Va = 1600 V

Example (worst) of a ROC with anomalous anode wire – C04 OROC

Septembre 1, 16h:00

Va = 1600 V

Va = 1600 V

Septembre 2, 14h:00

Septembre 2, 15h:00

Va = 1600 V

Septembre 2, 16h:00

60

Long term test – C05 IROC

Va = 1380 V Va = 1380 V

Va = 1380 V Va = 1380 V

Septembre 12, 10h:00 Septembre 12, 12h:00

Septembre 12, 14h:45 Septembre 12, 17h:45

61

Va = 1600 V Va = 1650 V

Va = 1700 V

Septembre 8

Long term test – C05 OROC

62

Va = 1650 V Va = 1650 V

Va = 1650 V Va = 1650 V

Septembre 12, 10h:00 Septembre 12, 12h:00

Septembre 12, 14h:45 Septembre 12, 17h:45

Long term test – C05 OROC