Straw spatial resolution (beam test 2007 and 2008) A.Zinchenko, S.Shkarovskiy.

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