	<i>Test Results for Chamber M3R4-123</i></font> Test Results for Chamber M3R4-123

Bar Codes Table. M3R4-123

Bar Codes Table. M3R4-123

Chamber M3R4	Chamber Bar Code	FEBs Bar Codes	Date Dressing	Comments
123	4UAPNB03400123	4UE20900112874 4UE20900112868 4UE20900112912	25-JAN-07	Chamber is in the Pit

Gas Leak Test. M3R4-123

Gas Leak Test. M3R4-123

Limit: <= 2mb/hour

Limit: <= 2mb/hour

Chamber	Gas Leak [mb/hour]	Test Date	Comments
123	.1		Relative methode

Durk Current Test. M3R4-123

Durk Current Test. M3R4-123

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
123	2	4	6	8	9	11	06-FEB-06	T=22.5C, H=22%, P=974mbar

Cosmic HV-Test. M3R4-123

Cosmic HV-Test. M3R4-123

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
123	1 2	288 295	323 329	342 342	358 366	488 459	879 734	31-JAN-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. M3R4-123

Cosmic Rays and Noise Counts from Internal Counters. M3R4-123

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=12fC 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=12fC	Atm.Pres.	Date	Plots	Status
123	468.6	432.8	449.1	456.8	3573.8	.7	Pa=970.7 mb	31-JAN-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=12fC (down plot) in all channels. Measurements time 1 sec.

Thresholds Scan. M3R4-123

Thresholds Scan. M3R4-123

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
123	81	525561	14	82	519699	13	76	457858	12	31-JAN-07		Sens=7.5mV/fc Th=15fc

Thr_Max in register units for M3R4-123

Thr_Max in register units for M3R4-123

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	80	81	85	85	75	82	84	76	89	83	79	85	83	76	81	75
FEB-2	91	82	89	73	95	74	80	74	90	79	86	73	88	80	78	73
FEB-3	71	81	71	79	75	75	71	82	76	73	74	77	69	82	78	79

Noise rate at Thr_Max [counts/sec] for M3R4-123

Noise rate at Thr_Max [counts/sec] for M3R4-123

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	703021	603595	507582	537955	510717	411892	425732	368302	445636	540683	457266	437578	635133	705854	608415	509613
FEB-2	480115	508278	559679	495524	582822	746550	552713	682920	331985	564094	405794	440085	460678	457148	567982	478818
FEB-3	324622	616567	333465	415323	293182	461004	290500	456730	291443	474280	376619	770817	352477	662956	595835	609912