	<i>Test Results for Chamber M3R4-24</i></font> Test Results for Chamber M3R4-24

Bar Codes Table. M3R4-24

Bar Codes Table. M3R4-24

Chamber M3R4	Chamber Bar Code	FEBs Bar Codes	Date Dressing	Comments
24	4UAPNB03400024	4UE20900112831 4UE20900114573 4UE20900114685	11-JUN-07	Chamber is in the Pit

Gas Leak Test. M3R4-24

Gas Leak Test. M3R4-24

Limit: <= 2mb/hour

Limit: <= 2mb/hour

Chamber	Gas Leak [mb/hour]	Test Date	Comments
24	.1		Relative methode

Durk Current Test. M3R4-24

Durk Current Test. M3R4-24

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.

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
24	12	14	16	16	20	25	11-OCT-05	chamber is OK

Cosmic HV-Test. M3R4-24

Cosmic HV-Test. M3R4-24

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
24	1 2	279 291	322 316	343 343	356 358	420 493	790 716	27-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

Cosmic Rays and Noise Counts from Internal Counters. M3R4-24

Cosmic Rays and Noise Counts from Internal Counters. M3R4-24

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
24	450.8	437.8	413.8	439.9	2357.7	85.1	Pa= 962.2 mb	27-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.

Thresholds Scan. M3R4-24

Thresholds Scan. M3R4-24

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
24	75	390477	12	74	510683	12	81	464972	12	27-JUN-07

Thr_Max in register units for M3R4-24

Thr_Max in register units for M3R4-24

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	75	79	72	85	84	69	75	71	71	70	68	74	83	72	74	77
FEB-2	77	75	84	80	68	74	67	72	67	77	70	69	74	78	72	78
FEB-3	71	89	69	86	81	78	78	79	85	81	84	82	80	81	78	87

Noise rate at Thr_Max [counts/sec] for M3R4-24

Noise rate at Thr_Max [counts/sec] for M3R4-24

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	441804	500019	487396	287922	326604	322592	383492	340669	347052	366194	280570	293462	315226	454607	464568	635453
FEB-2	436297	591861	361640	818955	324478	515194	279421	302841	359519	398161	414301	465834	571244	911675	615670	803829
FEB-3	413028	546473	477753	631153	371525	489224	360349	368907	334661	487051	336296	329765	448309	685697	531230	628128