	<i>Test Results for Chamber M3R4-18</i></font> Test Results for Chamber M3R4-18

Bar Codes Table. M3R4-18

Bar Codes Table. M3R4-18

Chamber M3R4	Chamber Bar Code	FEBs Bar Codes	Date Dressing	Comments
18	4UAPNB03400018	4UE20900113343 4UE20900113332 4UE20900113329	27-JUN-07	Chamber is in the Pit

Gas Leak Test. M3R4-18

Gas Leak Test. M3R4-18

Limit: <= 2mb/hour

Limit: <= 2mb/hour

Chamber	Gas Leak [mb/hour]	Test Date	Comments
18	.1		Relative methode

Durk Current Test. M3R4-18

Durk Current Test. M3R4-18

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
18	1	3	5	6	9	12	09-NOV-05	H~47%, chamber is OK

Cosmic HV-Test. M3R4-18

Cosmic HV-Test. M3R4-18

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
18	1 2	288 276	328 324	341 341	364 359	461 430	914 950	01-JUL-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. M3R4-18

Cosmic Rays and Noise Counts from Internal Counters. M3R4-18

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
18	496.3	462.5	456.4	457	2442.3	67.6	Pa=959.4 mb	29-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. M3R4-18

Thresholds Scan. M3R4-18

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
18	74	531339	13	81	533125	13	76	407027	12	29-JUN-07

Thr_Max in register units for M3R4-18

Thr_Max in register units for M3R4-18

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	72	65	66	76	79	68	79	72	72	68	81	67	86	72	80	75
FEB-2	78	80	80	87	81	80	75	79	77	85	87	82	81	82	85	84
FEB-3	80	91	75	80	77	79	74	73	72	72	71	77	75	73	72	77

Noise rate at Thr_Max [counts/sec] for M3R4-18

Noise rate at Thr_Max [counts/sec] for M3R4-18

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	491765	676352	489110	477279	575426	388183	530169	640086	391571	559809	479904	491474	429253	542969	602676	735401
FEB-2	512096	541308	686168	492135	456817	606811	392749	568792	415536	530363	542057	392241	430193	517062	662495	783176
FEB-3	374806	569589	438802	518697	358788	345290	492859	248574	379650	332915	312312	301744	411143	332203	605676	489388