TRT workshop 25.06.20131 Argon Xenon mix stability Kramarenko Viktor Vorobev Konstantin 10/12/2015.

TRT workshop 25.06.2013 1

Argon Xenon mix stability

Kramarenko Viktor

Vorobev Konstantin

04/19/23


Research program

1. Gas amplification. 2. Point of discharge.3. Maximally possible safe mode under varied conditions:

the displacement of signal wire,γ irradiation,α particles.

4. Long-term work with real TRT module, under the irradiation.

Table of the gases was investigated:

C o m p o n e n t p e r c e n t a g e

Ar 80 75 70 65 60 80 75 70 65 60 80 75 70 65 60

CO2 20 25 30 35 40 17 22 27 32 37 19 24 39 34 39

O2 0 3 1

Component percentage

Xe 70 70 70

CO2 29.5 29 27

O2 0.5 1 3

04/19/23


Setup for investigations gas gain and safety margin on single straw

CAEN HV Gas

Attenuator

Amplifier

Dual discrimin

ator

Dual counter

Preamp

Fe55/Am241

Low levelthreshold

High levelthreshold

61k

1k

Xe mix, Fe55, Spectra

0

10

20

30

40

50

60

70

80

0 50 100 150 200 250 300 350 400 450 500 550 600

ADC channels

Ar mix, Fe55, Spectra

0

20

4060

80

100

120140

160

180

0 50 100 150 200 250 300 350 400 450 500 550 600

ADC channel

Gas gain = I × w / (N Low threshold × ‹E› × q) w for Ar ~ 27 eV; for Хе ~ 24 eV; q – 1.6*10-19;

Bending straw – 400um

wire eccentricit

y

04/19/23


Gas gain for 70% Ar and Xe mix for strait straw

1.E+03

1.E+04

1.E+05

1.E+06

1200 1300 1400 1500 1600 1700 1800

U cathode, (V)

Gas

gai

n

Ar - 70/30

Ar - 70/29/1

Ar - 70/27/3

Xe 70.7/28.8/0.49

Xe 72.1/26.9/0.9

Xe 70.8/26.8/2.4

Gas gain for straight straw Ar and Xe mix Ar/CO2 for <100um straw

1.E+03

1.E+04

1.E+05

1.E+06

1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800

U cathode, (V)

Ga

s g

ain

80/20

75/25

70/30

65/35

60/40

Ar/CO2/O2-1% for <100um straw

1.E+03

1.E+04

1.E+05

1.E+06

1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800

U cathode, (V)

Ga

s g

ain

80/19/1

75/24/1

70/29/1

65/34/1

60/39/1

Ar/CO2/O2 -3% for <100um straw

1.E+03

1.E+04

1.E+05

1.E+06

1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800

U cathode, (V)

Ga

s g

ain

80/17/3

70/27/3

65/32/3

60/37/3

Gas gain for 60% Ar mix for strait straw

1.E+03

1.E+04

1.E+05

1.E+06

1200 1300 1400 1500 1600 1700 1800

U cathode, (V)

Gas

gai

n

Ar - 60/40

Ar - 60/39/1

Ar - 60/37/3

Gas gain for 80% Ar mix for straight straw

1.E+03

1.E+04

1.E+05

1.E+06

1200 1300 1400 1500 1600 1700 1800

U cathode, (V)

Gas

gai

n

Ar - 80/20

Ar - 80/19/1

Ar - 80/17/3

04/19/23


High Voltage for 25000 gas gain. Summary result for straight straw

Argon

HV % O2 Gas mix

1512 0 Ar - 60/40

1540 1 Ar - 60/39/1

1580 3 Ar - 60/37/3

1430 0 70/30

1455 1 70/29/1

1467 3 70/27/3

1330 0 Ar - 80/20

1350 1 Ar - 80/19/1

1365 3 Ar - 80/17/3

Xenon

1555 0.5 70.7/28.8/0.49

1565 0.9 72.1/26.9/0.9

1570 2.4 70.8/26.8/2.4

04/19/23


Setup for the discharge point study for single straw

CAEN HV Gas

Attenuator

Amplifier

Dual discrimin

ator

Dual counter

Preamp

Fe55/Am241

Low levelthreshold

High levelthreshold

61k

1k

04/19/23


Barrel type 2 №13, 520 straw Gas Ar and Xe mix with close gas system . Two X-ray 40 kV, 5 uA Current of ionisation 22 – 70 nA/cm straw for GG ~ 100000. Trip of each HV unit 1mA on 128 straw, work current 0.7uA for H/V unit

X-rays 40kV

CAEN N

CAEN N

CAEN N

CAEN N

Barrel

Setup for investigation safety margin on real TRT unit

04/19/23


Discharge point for Ar mix for bend and strait straw. Fe55

1500

1550

1600

1650

1700

1750

1800

1850

1900

1950

2000

55 60 65 70 75 80 85

Ar concentration, (%)

U c

ath

od

e, (

V)

400um straw, O2 = 0%



Straight straw, O2 = 0%



Discharge point for Ar mix single straw Safety margin for Ar mix with 1 – 2% O2.

Bend straw

Straight straw

Ar mix. Safety margin relative working gas gain. Straight and bend straw and strong ionizing particle .

0

50

100

150

200

250

300

350

400

55 60 65 70 75 80 85

Argon, (%)

Del

ta U

, (V

)

Straight for 1%O2

Straight for 3%O2

Bent for 1%O2

Bent for 3%O2

Alfa 1%O2

04/19/23


Ar mix. Instability of Ar gas mix 70/30 without O2 Argon long time measurement with BARREL

Barrel. Discharge point for 70% Ar mix. X-rays (104-27)nA/cm straw

1400

1450

1500

1550

1600

1650

1700

1750

0.0 1.0 2.0 3.0 4.0

Percentage O2, (%)

Bre

akd

ow

n H

V,

(V)

BarrelGas gainBend straw

Barrel. Failure rate for Ar/CO2 (70/30), X-rays (104-27)nA/cm straw for norm GG

1400

1450

1500

1550

1600

1650

1700

0.0 20.0 40.0 60.0 80.0

Time between failures, (hour) B

reak

do

wn

HV

, (V

)

Insufficient level of safety

margin

04/19/23

Barrel ArLong-term test For each gas mix > 100 hours under

40keV X-rays


Discharge point for 70%Xe mix and different content of O2

1500

1550

1600

1650

1700

1750

1800

1850

1900

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Persentage of O2, (%)

Dis

char

ge

po

int,

(V

)

Fe55 Straight straw

Fe55 Bend straw

Barrel

Am241 bend straw

Gas gain 25000

Gas gain and discharge issues for Xe

Xe Safe

margin

Insufficient level of safety

margin

04/19/23

Barrel Xe

Long-term test For each gas mix >

100 hours under 40keV X-rays


Safety margin summary for Ar and Xe mix

Gas mixGas gain

Discharge point bend straw

Discharge point bend straw alfa

Safety margin

bend straw

Safety margin

bend straw alfa

25000 V V V V

80%Ar+17%+3%O2 1365 1590 1570 225 205

80%Ar+19%+1%O2 1350 1570 1510 220 160

80%Ar+20%O2 1330 1540 1490 210 160

75%Ar+22%+3%O2

75%Ar+24%+1%O2 1400 1630 1590 230 190

75%Ar+25%O2 1380 1600 1570 220 190

70%Ar+27%+3%O2 1467 1700 1670 233 203

70%Ar+29%+1%O2 1455 1680 1630 225 175

70%Ar+30%O2 1430 1650 1640 220 210

65%Ar+32%+3%O2 1520 1760 240

65%Ar+34%+1%O2 1510 1730 1680 220 170

65%Ar+35%O2 1483 1700 1710 217 227

60%Ar+37%+3%O2 1580 1810 230

60%Ar+39%+1%O2 1540 1780 1760 240 220

60%Ar+40%O2 1512 1750 1740 238 228

70.8%Xe+26.8%+2.4%O2 1560 1770 1710 210 150

70.9%Xe+26%+0.9%O2 1550 1720 1660 170 110

70.7%Xe+28.8%+0.5%O2 1560 1700 1600 140 40

04/19/23


Conclusion

AR mixtures 60-80% with oxygen content more than 1% are stable from the point of view of safety and stable long-term work under the conditions of high luminosity ATLAS. This statement is correct for the working gas gain. Of course, work with the large gas gain reduces safety margin level.

04/19/23

TRT workshop 25.06.20131 Argon Xenon mix stability Kramarenko Viktor Vorobev Konstantin 10/12/2015.

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Transcript of TRT workshop 25.06.20131 Argon Xenon mix stability Kramarenko Viktor Vorobev Konstantin 10/12/2015.