MiniPrototype SinglesCosmicRuns 2008

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Goal

Use singles Cosmic events to measure rate differences between Metalica and Plastica

Apparatus

  • Plastica and Metalica are stacked on top of each other. High Voltage and ionization gas are connected in parallel.
  • A discriminator is connector to the amplified output (an on board preamp and the VPI Post amp) of sense wire 4.
  • The discriminator output is connected to a VME scaler.

Proposed Tests

  1. Measure the singles rate as a function of DC high voltage
  2. Measure the singles rate as a function of Discriminator Threshold


9-05-2008

The DC high voltage is on. The DC outputs of Plastika and Metalica from sense wire 4 are connected to the Model 777 Octal Variable Gain Amplifier.

HV settings
Wire Volts
Sense 1450
Field -725
Guard 725


Scope pictures representing the cosmic signals from Plastika and Metalica(Amplifier is connected)

  • Plastika

Plastika output wire 4 amplifier HV on 1450V 9-05-2008 1.png
Plastika output wire 4 amplifier HV on 1450V 9-05-2008 2.png
Plastika output wire 4 amplifier HV on 1450V 9-05-2008 3.png

  • Metalica

Metalica output wire 4 amplifier HV on 1450V 9-05-2008 1.png
Metalica output wire 4 amplifier HV on 1450V 9-05-2008 2.png
Metalica output wire 4 amplifier HV on 1450V 9-05-2008 3.png

Rate -vs- Discriminator Threshold

Gas is ArCo2 . 75/25 mixture

HV settings
Wire Volts
Sense 1700
Field -850
Guard 850


Threshold (mV) Metalica (Events/hr) Plastika (Events/hr) Coincidence
300 701 [math]\pm \sqrt{\frac{1.04194}{730}}[/math] 627 [math]\pm \sqrt{\frac{1.04194}{653}}[/math]
300 560 [math]\pm \sqrt{\frac{1.01639}{569}}[/math] 570 [math]\pm \sqrt{\frac{1.01639}{579}}[/math]
310 [math]592 \pm 11[/math] [math]500 \pm 24[/math]
325 [math]528 \pm 65[/math] [math]465 \pm 30[/math] 32
350 [math]421 \pm 48[/math] [math]379 \pm 40[/math]
400 [math]305[/math] [math]235[/math] 31


Gas is ArCo2 . 90/10 mixture

HV settings
Wire Volts
Sense 1450
Field -725
Guard 725


The scope picture below was taken to illustrate the noise levels on the DC signals after amplification just before disrimination. Previous measurements suggested that the sense wire signal noise had an RMS of about 10 mV. The phillips amplifier doubles this noise RMS. The amplitude of the noise is about 30 mV.


BabyChamberAfterPhillipsAmp 5-12-08.png

Threshold (mV) Metalica (Events/hr) Plastika (Events/hr) Coincidence (Event/hr)
100 1915 1912 90
100 2148 1799 36
100 1885 1758 37
100 2012 1912 91
100 1905 1754 25
150 671 588 14
150 645 596 11
150 634 596 19
150 629 563 13
150 634 550 5
175 361 358 20
175 380 329 14
175 396 329 14
175 391 344 10
200 286 256 25
200 291 232 4
200 291 251 6
225 183 168 4
225 193 180 6
250 122 120 2
300 93 88 2
350 74 60 3


Threshold (mV) Metalica (Events/hr) Plastika (Events/hr) Coincidence (Event/hr)
100 [math]1973 \pm 98[/math] [math]1827 \pm 71[/math]
150 [math]643 \pm 15[/math] [math]583 \pm 17[/math]
175 [math]382 \pm 13[/math] [math]340 \pm 12[/math]
200 [math]289 \pm 2[/math] [math]246 \pm 10[/math]
225 [math]188 \pm 5[/math] [math]174 \pm 6[/math]
250 122 120
300 93 88
350 74 60



Discriminator threshold vs rate for plastika phillips model 777.jpgDiscriminator threshold vs rate for metalica phillips model 777.jpg

With preamp and Post amp on

Sense wire #4 from Metalica comes out of VPI post amp channel #10. VPI channel #15 goes into ADC channel #3


Sense wire #4 from Plastika comes out of VPI post amp channel #15. VPI channel #15 goes into ADC channel #6

Voltage on preamp is 6.0 V.

HV settings
Wire Volts
Sense 1500
Field -750
Guard 750



Compare Phillips output and VPI postamp output

Noise level of Plastika and Metalica. The moise on the Phillips amp went from 10 mV to 100 mV due to the voltage applied to the preamps. If you turn the preamp power supply off the noise will go back to ~20 mV.
Plastika
Plastika noise level after VPIPostAmp and Phillips777 amplifier.png
Metalica
Metalica noise level after VPIPostAmp and Phillips777 amplifier.png

Plastika phillips output vs VPI postamp output HV on 1500 1.pngPlastika phillips output vs VPI postamp output HV on 1500 2.png
Metalica phillips output vs VPI postamp output HV on 1500 1.pngMetalica phillips output vs VPI postamp output HV on 1500 2.png

16-05-2008

HV settings
Wire Volts
Sense 1500
Field -750
Guard 750


The Voltage on the PreAmp is 6.3 Volts

Metalica
Metalica noise level after VPIPostAmp and Phillips777 amplifier preamp 6 3V.pngMetalica noise level after VPIPostAmp and Phillips777 amplifier preamp 6 3V may 22 2008.png
Plastika
Plastika noise level after VPIPostAmp and Phillips777 amplifier preamp 6 3V.pngPlastika noise level after VPIPostAmp and Phillips777 amplifier preamp 6 3V may 22 2008.png

Metalica signal output after VPIPostAmp and Phillips777 amplifier preamp 6 6V.png

Threshold(mV) Metalica (Events/hr) Plastika (Events/hr) Metalica (Events/hr)VPI PostAmp Plastika (Events/hr)VPI PostAmp
150 5828 8172 10021 18673
150 5545 8008 9295 17751
200 1592 2276 3922 6559
200 1547 2163 3854 2163
250 593 747 973 1719
250 593 661 925 1640
250 522 610 951 1592
300 296 339 426 585
300 282 339 413 615
300 314 291 411 626
400 130 159 285 269
450 86 97 151 152
500 53 71 92 107
550 40 50 77 96



Threshold(mV) Metalica (Events/hr) Plastika (Events/hr) Metalica (Events/hr)VPI PostAmp Plastika (Events/hr)VPI PostAmp
150 [math]5687 \pm 141[/math] [math]8090 \pm 82[/math] [math]9658 \pm 363[/math] [math]18212 \pm 461[/math]
200 [math]1570 \pm 23[/math] [math]2220 \pm 56[/math] [math]3888 \pm 34[/math] [math]4361 \pm 2198[/math]
250 [math]569 \pm 33[/math] [math]673 \pm 56[/math] [math]950 \pm 20[/math] [math]1650 \pm 52[/math]
300 [math]297 \pm 13[/math] [math]323 \pm 23[/math] [math]417 \pm 7[/math] [math]609 \pm 17[/math]
400 130 159 285 269
450 86 97 151 152
500 53 71 92 107
550 40 50 77 96


Discriminator threshold vs rate for metalica and plastika Phillips gain amplifier 777 HVOn 1500V.jpg

Discriminator threshold vs rate for metalica and plastika VPI PostAmp HVOn 1500.jpg

2-06-2008

HV settings
Wire Volts
Sense 1450
Field -725
Guard 725


The Voltage on the PreAmp is 6.3 Volts

Metalica
Metalica noise level after VPIPostAmp and Phillips777 amplifier preamp 6 3V HV On 1450.png
Plastika
Plastika noise level after VPIPostAmp and Phillips777 amplifier preamp 6 3V HV On 1450.png

Threshold(mV) Metalica (Events/hr) Plastika (Events/hr) Metalica (Events/hr)VPI PostAmp Plastika (Events/hr)VPI PostAmp
50 39635 38282 15459 17624
50 37759 22176 15555 15898
50 37858 9758 15536 15666
50 35340 8819 15160 1528
100 1014 1556 1236 4076
100 1120 1713 1280 4145
100 1091 1728 1200 4200
100 1055 1476 1290 4126
150 369 513 393 1337
150 362 585 373 1293
150 460 778 352 1363
150 371 576 413 1442
175 232 363 222 803
175 299 428 239 835
175 205 343 230 752
175 186 318 215 704
200 183 241 144 401
200 116 198 138 401
250 95 141 104 205
300 39 59 52 69
350


Threshold(mV) Metalica (Events/hr) Plastika (Events/hr) Metalica (Events/hr)VPI PostAmp Plastika (Events/hr)VPI PostAmp
50 [math]37648 \pm 1527[/math] [math]19753 \pm 11928[/math] [math]15428 \pm 159[/math] [math]16279 \pm 783[/math]
100 [math]1070 \pm 40[/math] [math]1618 \pm 106[/math] [math]1252 \pm 36[/math] [math]4137 \pm 44[/math]
150 [math]391 \pm 40[/math] [math]613 \pm 99[/math] [math]383 \pm 23[/math] [math]1359 \pm 54[/math]
175 [math]231 \pm 43[/math] [math]363 \pm 41[/math] [math]227 \pm 9[/math] [math]774 \pm 50[/math]
200 [math]150 \pm 34[/math] [math]220 \pm 22[/math] [math]141 \pm 3[/math] [math]401 \pm 0[/math]
250 [math]95[/math] [math]141[/math] [math]104[/math] [math]205[/math]


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