straw spatial resolution (beam test 2007 and 2008) a.zinchenko, s.shkarovskiy
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Straw spatial resolution(beam test 2007 and 2008)
A.Zinchenko, S.Shkarovskiy
Muon and pion runs(2007), Muon runs (2008)
Gas mixture(2007) – CO2+isoC4H10+CF4 (80:10:10)
Gas mixture(2008) – CO2+isoC4H10+CF4 (82:5:13)
Front end chip – ASD-8 (2007) ASDQ, CARIOCA (2008)
Threshold: 6 fC
HV: (2200 –2700) V (Gas gain: 2•104 – 106)
Comparison ASD-8, ASDQ and CARIOCA
Front-End Chips
Straw resolution vs R (ASD-8) Ua=+2400 V Gas Gain G=1•105
Straw resolution(sigma)
40x1.2=48 mkm
R (cm)
Th= 6 fCTh=12 fC
Sigma of residuals
(cm)Muon runs
Straw resolution(sigma)45 mkm
Straw resolution (cm) vs R (cm) (Garfield)
Th= 6 fCTh=12 fC
Straw residuals vs HV (ASD-8, beam test 2007)
Straw residuals vs HV
0,00
20,00
40,00
60,00
80,00
100,00
120,00
140,00
160,00
2,20 2,30 2,40 2,50 2,60
HV (kV)
Sig
ma
(mk
m)
Muon+pion runsTh=6 fC
for straw R>3 mm
Straw residuals vs HV (ASDQ, CARIOCA)
Beam test 2008, ASDQ Beam test 2008, CARIOCA
R = 350 Ohm
R = ∞ Ohm
R = 350 Ohm
R = ∞ Ohm
Res
idua
l, m
km
Res
idua
l, m
km
HV, V
Threshold Th= 6 fC, for straw R=3 mm
HV, V
Straw resolution 40x1.2 = 48 mkm
Straw resolution 60x1.2 = 72 mkm
Straw residuals vs HV (ASDQ, CARIOCA)
Beam test 2008, ASDQ Beam test 2008, CARIOCA
R = 350 Ohm
R = ∞ Ohm
R = 350 Ohm
R = ∞ Ohm
Res
idua
l, m
km
Res
idua
l, m
km
HV, V
Threshold Th= 6 fC, for straw R=3 mm
HV, V
Straw resolution 40x1.2 = 48 mkm
Straw resolution 50x1.2 = 60 mkm
R, cm R, cm
R, cm
R, cm
R, cm
R, cmBeam test 2008, ASDQ
Beam test 2008, CARIOCA
Beam test 2007, ASD-8
GARFIELD, ASDQ
GARFIELD, CARIOCA
GARFIELD, ASD-8
Ua=2600 VUa=2500 V
Ua=2400 V Ua=2400 V
Ua=2600 VUa=2500 V
Ua=2600 VUa=2500 V
Ua=2600 VUa=2500 V
Residuals, mkm
Straw resolution vs R (ASD-8, ASDQ, CARIOCA)
Straw resolution vs R Threshold Th=6 fC
ASD-8 HV=2400 V G=1 •105
ASDQ HV=2500 V G=1 •105
CARIOCA HV=2600 V G=2 •105
Res
o lu
tio n
, cm
R, cm
NA62 requerement
ASD-8 HV=2400 V G=1 •105
ASDQ HV=2500 V G=1 •105
CARIOCA HV=2600 V G=2 •105
Res
idu
al, c
m
R, cm
NA62 requerement
Beam test 2007, 2008 GARFIELD
Amplification vs Wire Voltage GARFIELD
Am
plif
icat
ion A
mp
lific
atio
n
Voltage, V Voltage, V
2375 V 2490 V
CO2+isoC4H10+CF4 (80:10:10) CO2+isoC4H10+CF4 (82:5:13)
dUshift = 115 V
Comparison CARIOCA
Front-End Chips
with transistor and resistor termination
CARIOCA cold (2 boards)
ch1
ch8
ch1
ch8 ch8
ch1 ch1
ch8
ch8
ch1
ch8
ch1
CARIOCA hot (2 boards)
ASDQ (2 boards)
Particles
Strawfar-end Open Hot Open Hot Open Hot
Strawnear-end
Inputs
1
4
3
2
5
6
7
8
1
4
3
2
5
6
7
8
1
4
3
2
5
6
7
8
1
4
3
2
5
6
7
8
1
4
3
2
5
6
7
8
1
4
3
2
5
6
7
8
TDC1 (32 channels)
TDC2 (32 channels)
# - dead wires
# - tubes used for reconstruction
CARIOCA cold =transistor termination
CARIOCA hot = resistor termination
Time spectrum from tube with CARIOCA hot
Time spectrum from tube with CARIOCA cold
RT-dependence
Drift time, ns
Drift time, ns
R,cm
R,cm
Row with CARIOCA resistor termination
Sigma residuals = 33.6 μm
Row with CARIOCA transistor termination
Sigma residuals = 47.2 μm
Residuals, cm
Residuals, cm
Straw residuals (CARIOCA)
Straw Efficiency vs Radius (ASD-8, th=6 fC)Ua=+2400 V (G=1•105)
R effective=4.7 mm
Data muon runs
R effective=4.8 mm
Efficiency vs R (cm)(Garfield)
Results
ASD-8 resolution (2007):
The minimal limit of straw spatial resolution is about 48 µm
for gas gain higher than G=1•105 and compare
with Garfield simulation result (45 µm)
Efficiency (2007):Straw efficiency is about 100% for R effective up to 4.7 mmand compare with Garfield simulation result (R up to 4.8 mm)
Results
Resolution (2008):
The minimal limit on straw spatial resolution for ASDQ (R = ∞) and for CARIOCA (R = ∞) is about 50 µm and compare with Garfield simulation result
CARIOCA with resistor termination is better than CARIOCA with transistor termination
Slightly wrong definition of RT-dependence and Т0 leads to insignificant degradation of the straw spatial resolution (compare results on slide 6 and 7)
Conclusions
Comparison ASD-8, ASDQ and CARIOCA FEE:
Straw spatial resolution for ASD-8, ASDQ and CARIOCA is about the same. The minimal limit of straw spatial resolution is about 50 µm
For gas mixture CO2+isoC4H10+CF4 (82:5:13) HV working point is in the range (2500 – 2600) V -> G=(1-2) •105
Comparison CARIOCA termination schemes:
CARIOCA with resistor termination is better than CARIOCA with transistor termination
ASD-8 8000 channels is available at Dubna
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