<i>Test Results for Chamber M3R4-171</i></font>

Test Results for Chamber M3R4-171
<font color="#00008B" size="5"><i><b>Bar Codes Table. M3R4-171</b></i></font>

Bar Codes Table. M3R4-171

Chamber
M3R4		 Chamber
Bar Code		 FEBs
Bar Codes		 Date Dressing Comments
171 4UAPNB03400171 4UE20900114258
4UE20900114091
4UE20900114255
 05-JUN-07 Chamber is in the Pit

<font color="DarkBlue" size="5"><i><b>Gas Leak Test. M3R4-171</b></i></font>

Gas Leak Test. M3R4-171

<font color="DarkRed" size="4"><i>Limit: <= 2mb/hour</i></font>

Limit: <= 2mb/hour

Chamber Gas Leak
[mb/hour]		 Test Date Comments
171 .1 Relative methode

<font color="DarkBlue" size="5"><i><b>Durk Current Test. M3R4-171</b></i></font>

Durk Current Test. M3R4-171

<font color="DarkRed" size="4"><i>Limit: Dark Current (sum of 4 gaps) <=100nA at HV=2.9 kV<br />Gas mixture Ar(40)/CO2(55)/CF4(5)<br />The table presents the currents (in nA) measured in the HV line.</i></font>

Limit: Dark Current (sum of 4 gaps) <=100nA at HV=2.9 kV
Gas mixture Ar(40)/CO2(55)/CF4(5)
The table presents the currents (in nA) measured in the HV line.

Chamber 2.4 kV 2.5 kV 2.6 kV 2.7 kV 2.8 kV 2.9 kV Test Date Comments
171 4 4 6 6 8 16 24-JAN-06 T=21.5C, H=22%, P=974mbar, passed the GIF test


<font color="#00008B" size="5"><i><b>Cosmic HV-Test. M3R4-171</b></i></font>

Cosmic HV-Test. M3R4-171

Table presents counts averaged over 24 pads measured during 300 sec in the mode AND (AB&CD).
Scan1 - HV(AB) fixed @ 2550 V
Scan2 - HV(CD) fixed @ 2550 V

Chamber Scan 2.35 kV 2.45 kV 2.55 kV 2.65 kV 2.75 kV 2.85 kV Date Plot Comments
171 1
2		 310
308		 356
350		 377
377		 496
419		 819
702		 1375
1146		 20-JUN-07

Fig.1 Counts/300s averaged over 24 pads.
AB&CD.
Scan1: HV(AB)=2550V
Scan2: HV(CD)=2550V		 Fig.2 Counts distribution in 24 pads.
AB&CD.
HV(AB)=HV(CD)= 2550 V		 Fig.3 Counts/300s averaged over 8 pads
in FEB1, FEB2, FEB3.
AB&CD
Scan1: HV(AB)=2550V
Scan2: HV(CD)=2550V

<font color="DarkRed" size="6"><i><b>Cosmic Rays and Noise Counts from Internal Counters. M3R4-171</b></i></font>

Cosmic Rays and Noise Counts from Internal Counters. M3R4-171

Table presents counting rates (counts per 100 sec) averaged over 24 pads in bi-gap AB or in bi-gap CD measured with Thr=16fC in all channels applying HV=2550V at one of the gaps (A,B,C,D) while the other gaps are at HV=0. Also presented are the noise rates (counts per 1 sec) averaged over 48 pads (in bi-gap AB and in bi-gap CD) measured at HV=0 in all gaps with Thr=8.5fC and with Thr=10fC in all channels. The thresholds were set individually for each channel according to the relation:
 Thr(reg.units)= Thr(fC)*S(reg.un/fC)-OFFSet(reg.un)+Thr_Max(reg.un). Here,
Thr_Max is the threshold at Maximum of noise rate;
OFFSet=17 reg.units (corresponding to 40mV);
S=3.40 reg.units/fC is the charge sensitivity (corresponding to Sens=7.5mv/fC accepted for M3R4 chambers);

HV(ON) HV(OFF)
Chamber HV(A)=2550
GapAB		 HV(B)=2550
GapAB		 HV(C)=2550
GapCD		 HV(D)=2550
GapCD		 Thr=8.5fC Thr=10fC Atm.Pres. Date Plots Status
171 457.5 464.1 462.5 467.2 5448.6 115.9 Pa= 963 mb 19-JUN-07
Fig.1 Counts distribution over pads in bi-gap AB (odd channels) and in bi-gap CD (even channels) at various HV combinations:
Left_Up: HV(A)=2550V; HV(B,C,D)=0;
Right_Up: HV(B)=2550V; HV(A,C,D)=0;
Left_Down: HV(C)=2550V; HV(A,B,D)=0;
Right_Down: HV(D)=2550V; HV(A,B,C)=0;
Thr=16fC in all channels. Measurements time 100 sec.		 Fig.2 Counts distribution over pads in bi-gap AB (odd channels) and bi-gap CD (even channels) at HV=0 in all gaps
Thr=8.5fC (upper plot) and in Thr=10fC (down plot) in all channels. Measurements time 1 sec.
<font color="DarkRed" size="6"><i><b>Thresholds Scan. M3R4-171</b></i></font>

Thresholds Scan. M3R4-171

Tables below present:
- Thr_Max(r.u.), Thresholds in register units at Maximum of noise rate;
- N_Max, Noise rate at Thr_Max in counts/sec;
- D_100 = Thr_100(r.u.) - Thr_Max(r.u.) where Thr_100(r.u.) is the threshold in register units at noise rate = 100/s.
 The following expression relates the real threshold (measured from the base-line of physical signals) with the thresholds determined by the register units:
Thr(fC)*S(r.u./fC) = Thr(r.u.) - Thr_Max(r.u.)+ OFFSet(r.u.).
 Here, OFFSet=17 register units;
S=3.40 r.u./fC is the charge sensitivity corresponding to S=8mV/fC taken for M3R4 chambers;
(Note, that 1 register unit = 2.35 mV)
FEB-1. Mean values. FEB-2. Mean values. FEB-3. Mean values.
Chamber Thr_Max
[r.u.]		 N_Max
[counts/s]		 D_100
[r.u.]		 Thr_Max
[r.u.]		 N_Max
[counts/s]		 D_100
[r.u.]		 Thr_Max
[r.u.]		 N_Max
[counts/s]		 D_100
[r.u.]		 Test Date Plots Comments
171 77 481312 12 82 451263 12 81 397780 11 19-JUN-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-171</b></i><br /></font>

Thr_Max in register units for M3R4-171

FEB
Channels		 Ch_1 Ch_2 Ch_3 Ch_4 Ch_5 Ch_6 Ch_7 Ch_8 Ch_9 Ch_10 Ch_11 Ch_12 Ch_13 Ch_14 Ch_15 Ch_16
FEB-1 76 79 82 80 74 82 79 76 81 74 75 76 74 69 76 75
FEB-2 79 85 87 79 83 84 86 73 84 82 88 77 87 79 78 79
FEB-3 77 79 81 82 88 75 95 80 86 79 87 75 84 77 85 73
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-171</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-171

FEB
Channels		 Ch_1 Ch_2 Ch_3 Ch_4 Ch_5 Ch_6 Ch_7 Ch_8 Ch_9 Ch_10 Ch_11 Ch_12 Ch_13 Ch_14 Ch_15 Ch_16
FEB-1 521889 533076 348640 441906 363529 337537 340757 439723 662926 319648 628286 424690 444223 544189 634033 715942
FEB-2 431698 525151 401988 275388 403731 291090 636619 327884 379241 241456 545450 280959 447286 364052 685229 982982
FEB-3 361138 465608 451013 367352 560733 341277 265930 296514 238562 289092 487401 450034 458617 375900 381732 573579
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-171</b></i><br /></font>

D_100 - in register units for M3R4-171

FEB
Channels		 Ch_1 Ch_2 Ch_3 Ch_4 Ch_5 Ch_6 Ch_7 Ch_8 Ch_9 Ch_10 Ch_11 Ch_12 Ch_13 Ch_14 Ch_15 Ch_16
FEB-1 12 14 11 13 11 11 11 13 12 11 12 12 12 13 13 12
FEB-2 14 13 13 11 12 12 12 10 13 11 11 12 12 12 14 13
FEB-3 11 12 10 10 13 11 11 11 10 10 11 11 14 12 13 12
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-171</b></i></font>

Noise counts vs Thresholds. M3R4-171


Noise rates vs Thresholds for FEB-1 Noise rates vs Thresholds for FEB-2 Noise rates vs Thresholds for FEB-3
<font color="DarkRed" size="5"><i><b>PLOTS of Thresholds Scan Results. M3R4-171</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-171

Scan results for FEB-1 (left plots), for FEB-2 (middle plots), for FEB-3 (right plots).
Thr_Max vs channel number (upper plot)
N_Max vs channel number (middle plot)
D_100 vs channel number (lower plot)

For comments, contact: Petr.Neustroev@cern.ch