straw spatial resolution (beam test 2007 and 2008) a.zinchenko, s.shkarovskiy
TRANSCRIPT
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Straw spatial resolution(beam test 2007 and 2008)
A.Zinchenko, S.Shkarovskiy
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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)
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Comparison ASD-8, ASDQ and CARIOCA
Front-End Chips
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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
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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
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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
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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
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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)
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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
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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
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Comparison CARIOCA
Front-End Chips
with transistor and resistor termination
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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
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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
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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)
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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)
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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)
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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)
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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