Pavia 25/11/2003Davide Piccolo INFN Napoli Status of assembling and Chamber results at HT Pavia...

Pavia 25/11/2003 Davide Piccolo INFN Napoli

Status of assembling and Chamber results at HT

Pavia 25/11/2003

Davide Piccolo


outlook

• Status of the assembling operation at HT

• Tests at HT

• Summary of the results

• Problems and peculiarities


HT chambers location

HT Bari

PaviaCERN

11 chambers

4 chambers back

3 chambers

8 chambers

8 chambers ready

30 chambers produced12 chambers at HT (9 ready,

3 to be checked)3 chambers at CERN (no cosmic test)7 chambers at PAVIA (tested ok)8 chambers at Bari (ready to be tested)


Tests at HT

• Continuity test: strip continuity check

• LV test• Gas test• Cooling test

• HV scan: I vs HV• Stability test: monitor

of dark current at 9500 Volts for one hour

• Test of single rate strip by strip

• Threshold test

Tests during assembling Tests after assembling


HV scan

0

0,5

1

1,5

2

2,5

3

3,5

4

1

11 21 31 41 51 61 71 81 91

101

111

121

131

141

151

161

171

181

191

201

211

221

231

241

251

261

271

281

291

301

311

321

time (10 sec)

I (uA

)

forw up

forw down

back up

back down

1000 V

2000 V

4000 V

3000 V

9500 V

9200 V

9000 V

8000 V

7000 V

6000 V

5000 V

HV scan


Stability testCHAMBER 173

0

0,5

1

1,5

2

2,5

3

3,5

4

4,5

1

10

19

28

37

46

55

64

73

82

91

10

0

10

9

11

8

12

7

13

6

14

5

15

4

16

3

17

2

18

1

19

0

19

9

20

8

21

7

22

6

23

5

24

4

25

3

26

2

27

1

28

0

28

9

29

8

30

7

31

6

HV (Volts)

I (u

A)

ant sup

ant inf

post sup

post inf

Temp 22 degrees


Analysis program under development

• Convert the HT data format in the standard CMS RPC DataBase format.

• Measure average and RMS of the dark current for every HV step

• In the future will include single rate measurement analysis


rms chamber 173

0

0,01

0,02

0,03

0,04

0,05

0,06

0,07

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

HV (Volts)

rms

I (u

A)

forw up

forw down

back up

back down

chamber 173

0

0,5

1

1,5

2

2,5

3

3,5

4

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

HV (Volts)

I (u

A)

forw upforw downback upback down Average dark current vs HV

RMS dark currentvs HV


temperature

0

5

10

15

20

25

30

35

1 5 9

13

17

21

25

29

33

37

41

45

49

53

57

61

65

69

73

77

81

85

89

93

97

10

1

10

5

10

9

chamber under test

tem

pe

ratu

re (

ce

lsiu

s)

temperatureSUMMARYRESULTS

172

34

37


Chamber 179 (double gap replaced)chamber 179

0

0,5

1

1,5

2

2,5

3

3,5

1 4 7

10

13

16

19

22

25

28

31

34

37

40

43

46

49

52

55

58

61

64

67

70

73

time (10 sec)

I (u

A)

forw up

forw down

back up

back down

back down OFF

Discharges On frame

HV = 9500 V.


Noise rate tests

chamber 172 FEB 3B

0

200

400

600

800

1000

1200

1400

1600

0 50 100 150 200 250 300 350

threshold (mV)

rate

(Hz)

strip 10

strip 11

strip 12

strip 13

strip 14

strip 15

strip 16

single rate vs threshold • Fast test single rate vs FEB threshold, with manual frequencymeter.

• Depending from enviromental conditions, noise rate very high or reasonable

• Prototype of 288 channels frequencymeter ready. Very soon will be tested on chamber and included in HT test procedures.


Main problems• Smd resistor broken on kapton (about 3

strips per bigap). Better situation for new bigaps.

• One cable broken after transportation to Bari (storage bars)

• For 3 chambers replaced a double gap (possible Extracosts at HT !) – Chamber 39 replaced backward bigap

– Chamber 33 replaced backward bigap

– Chamber 179 replaced backward bigap


Future plans

• 8 chambers ready to be sent to Pavia

• 21 double gaps at HT

• 8 chambers can be assembled

• 5 slots available for storage

• Need trolleys for storage

• We plan to produce at least 15-18 more chambers by the end of the year

Pavia 25/11/2003Davide Piccolo INFN Napoli Status of assembling and Chamber results at HT Pavia...

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