	<i>Test Results for Chamber M3R4-27</i></font> Test Results for Chamber M3R4-27

Bar Codes Table. M3R4-27

Bar Codes Table. M3R4-27

Chamber M3R4	Chamber Bar Code	FEBs Bar Codes	Date Dressing	Comments
27	4UAPNB03400027	4UE20900114760 4UE20900113519 4UE20900114771	11-JUN-07	Chamber is in the Pit

Gas Leak Test. M3R4-27

Gas Leak Test. M3R4-27

Limit: <= 2mb/hour

Limit: <= 2mb/hour

Chamber	Gas Leak [mb/hour]	Test Date	Comments
27	.1		Relative methode

Durk Current Test. M3R4-27

Durk Current Test. M3R4-27

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
27	14	16	16	18	20	24	12-OCT-05	chamber is OK

Cosmic HV-Test. M3R4-27

Cosmic HV-Test. M3R4-27

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
27	1 2	354 352	336 369	347 347	364 383	459 507	836 976	28-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. M3R4-27

Cosmic Rays and Noise Counts from Internal Counters. M3R4-27

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
27	474	447.6	465	465.4	11045	745.6	Pa= 963.4 mb	28-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. M3R4-27

Thresholds Scan. M3R4-27

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
27	80	577659	14	83	620548	14	83	493795	13	27-JUN-07

Thr_Max in register units for M3R4-27

Thr_Max in register units for M3R4-27

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	87	77	85	74	85	80	84	81	80	74	74	84	76	82	79
FEB-2	86	86	81	85	84	83	85	84	77	80	82	88	74	83	84	80
FEB-3	85	83	74	77	75	89	86	86	74	83	83	89	85	84	87	86

Noise rate at Thr_Max [counts/sec] for M3R4-27

Noise rate at Thr_Max [counts/sec] for M3R4-27

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	676726	690043	1095480	557243	506048	494914	495360	382376	442046	372484	506164	590122	498424	600324	684983	649799
FEB-2	605878	643859	962219	602839	694228	454495	497211	459464	582054	444618	569596	503784	775103	545751	691293	896376
FEB-3	429201	705341	382650	542182	369807	529276	374264	512181	368968	421217	423095	497927	426088	628364	575602	714562