Electrical Method: Description of the system 3% resolution - - PowerPoint PPT Presentation

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Electrical Method: Description of the system

arXiv:1804.05941 [physics.ins-det]

3% resolution

SLIDE 5

Performance of the system

ß Dependency on VAC and VDC Dependency on wire length à

SLIDE 6

Electrical Method: Setup

Connector for SBND boards SBND test frame

About 40 seconds to scan a frequency range of 45 Hz (32 wires in parallel)

SLIDE 7

Example of one (of 32) signals measured simultaneously in 40 seconds

Measurements taken in the Y-plane wires of the SBND test frame: note that the signal of the two wire segments with slightly different lengths (65.5 cm and 67.5 cm) are visible

115 120 125 130 135 140 145 150 Frequency [Hz] 720 740 760 780 800 820 840 860 880 ADC Steps

Channel Number 13

SLIDE 8 144 146 148 150 152 Frequency [Hz] 288 290 292 294 296 298 300 ADC Steps Channel Number 1 144 146 148 150 152 Frequency [Hz] 288 290 292 294 296 298 300 ADC Steps Channel Number 2 118 120 122 124 126 128 Frequency [Hz] 325 330 335 340 345 ADC Steps Channel Number 3 142 144 146 148 150 152 Frequency [Hz] 364 366 368 370 372 374 376 378 380 382 ADC Steps Channel Number 4 136 138 140 142 144 146 Frequency [Hz] 360 365 370 375 380 ADC Steps Channel Number 5 136 138 140 142 144 146 Frequency [Hz] 400 405 410 415 420 ADC Steps Channel Number 6 136 138 140 142 144 146 Frequency [Hz] 405 410 415 420 425 ADC Steps Channel Number 7 134 136 138 140 142 144 Frequency [Hz] 350 355 360 365 370 ADC Steps Channel Number 8 128 130 132 134 136 138 Frequency [Hz] 375 380 385 390 395 ADC Steps Channel Number 9 132 134 136 138 140 142 Frequency [Hz] 342 344 346 348 350 352 354 356 358 360 362 ADC Steps Channel Number 10 132 134 136 138 140 142 Frequency [Hz] 332 334 336 338 340 342 344 346 348 350 ADC Steps Channel Number 11 130 132 134 136 138 140 Frequency [Hz] 326 328 330 332 334 336 338 340 342 344 346 ADC Steps Channel Number 12 128 130 132 134 136 138 140 Frequency [Hz] 385 390 395 400 405 ADC Steps Channel Number 13 122 124 126 128 130 132 Frequency [Hz] 330 335 340 345 350 ADC Steps Channel Number 14 126 128 130 132 134 136 Frequency [Hz] 375 380 385 390 395 ADC Steps Channel Number 15 124 126 128 130 132 134 136 Frequency [Hz] 390 395 400 405 410 415 ADC Steps Channel Number 16 136 138 140 142 144 146 Frequency [Hz] 415 420 425 430 435 ADC Steps Channel Number 17 126 128 130 132 134 136 Frequency [Hz] 390 395 400 405 410 415 ADC Steps Channel Number 18 118 120 122 124 126 128 130 Frequency [Hz] 350 355 360 365 370 375 ADC Steps Channel Number 19 118 120 122 124 126 128 Frequency [Hz] 350 355 360 365 370 ADC Steps Channel Number 20 118 120 122 124 126 128 130 Frequency [Hz] 320 325 330 335 340 ADC Steps Channel Number 21 122 124 126 128 130 132 Frequency [Hz] 335 340 345 350 355 ADC Steps Channel Number 22 122 124 126 128 130 132 Frequency [Hz] 335 340 345 350 355 ADC Steps Channel Number 23 120 122 124 126 128 130 132 Frequency [Hz] 350 355 360 365 370 375 ADC Steps Channel Number 24 120 122 124 126 128 130 Frequency [Hz] 335 340 345 350 355 ADC Steps Channel Number 25 114 115 116 117 118 119 120 121 122 Frequency [Hz] 376 378 380 382 384 386 388 390 392 394 396 398 ADC Steps Channel Number 26 118 120 122 124 126 128 Frequency [Hz] 365 370 375 380 385 390 ADC Steps Channel Number 27 122 124 126 128 130 132 Frequency [Hz] 400 405 410 415 420 425 430 ADC Steps Channel Number 28 122 124 126 128 130 132 Frequency [Hz] 340 345 350 355 360 ADC Steps Channel Number 29 114 115 116 117 118 119 120 121 122 123 Frequency [Hz] 336 338 340 342 344 346 348 350 352 354 356 ADC Steps Channel Number 30

Example of 30 (of 32) signals measured simultaneously in 40 seconds

Measurements taken in the Y-plane wires of the SBND test frame: note that the signal of the two wire segments (with slightly different lengths) are visible

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• Stainless-steel bar (piece of “real”

frame) with copper beryllium wires

• Vacuum jacketed dewar
• Four temperature sensors (PT1000)

at different heights connected to DAQ

Cryogenic test

Frame with CuBe wires PT1000 resistors Inside the dewar

~ 20% ~ 6%

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First results with 5mm wire pitch

59.2 59.4 59.6 59.8 60 60.2 60.4 60.6 60.8 61 Frequency [Hz] 740 745 750 755 760 ADC Steps

Channel Number 11

57.2 57.4 57.6 57.8 58 58.2 58.4 58.6 58.8 59 59.2 Frequency [Hz] 1050 1055 1060 1065 1070 1075 1080 ADC Steps

Channel Number 13

57 57.2 57.4 57.6 57.8 58 58.2 58.4 58.6 58.8 Frequency [Hz] 1115 1120 1125 1130 1135 1140 1145 1150 1155 ADC Steps

Channel Number 16

53.2 53.4 53.6 53.8 54 54.2 54.4 54.6 54.8 55 55.2 Frequency [Hz] 1095 1100 1105 1110 1115 1120 1125 1130 1135 ADC Steps

Channel Number 18

DC voltage = 210 V; AC amplitude = 80 V; Wire Length = 1.4 m (typical DUNE segment length)

SLIDE 11

Towards applying in DUNE APAs

• In the next slides we will assume that it is early

enough to still make some modifications to the boards which would greatly benefit the overall project à it has the potential to significantly speed up the production procedure

• We had a first look at possible modifications; these

should be doable, but would need some input from

• ther experts and the Consortium (not a Manchester
• nly task).
• We will need to be relatively fast at this point to

make it for TDR.

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Design considerations (wire-bonding board): PCB copper clearance/creepage

• Which standard for PCB

clearance and creepage?

• IPC-2221B (Generic

Standard on. Printed Board Design): 500V = 2.5mm

• Some examples of the

current issues:

• Passthrough Mil-Max pins

clearance on X-Plane board, etc.

• Approx. 0.6mm = 120V
• Could realign so connecting

passthrough pins are stacked vertically and stagger the arrangement.

X plane - Worst case V / U plane G plane – Not possible in current design (4-wires in parallel)

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• Which standard for PCB

clearance and creepage?

• IPC-2221B: 500V = 2.5mm
• Some examples of the

current issues:

• V-plane connector on

CR_Board (as no capacitors to block DC)

• Clearance 0.3mm = 60V
• Need larger pitch / single row

connector (do we have space?)

• U / X plane has capacitors,

so only AC component present at connector

Connection here U plane from the back side of the board (possible?)

Design considerations (CR boards): PCB copper clearance / creepage

X / V / U

APA Signal readout channels

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Design considerations: Connectivity

• Need to be able to connect before

the capacitor on planes with RC components

• Would require additional connector
• n the RC board or a board that can

piggyback on the existing Mil-Max pins

• Pogo-pins are an option for this

APA Signal readout channels APA wire signals

SLIDE 15

Conclusions

• We have designed and developed an electrical method to

precisely measure the tensions of multiple wires simultaneously with a resolution of about 3% applying voltages

• f a few hundred volts
• We study the behavior of our system with respect to the bias

voltages applied and the wire length and we develop a model that allows us to predict the amplitude of the signal

• We demonstrate that this technique can be used to measure

wire tension at cryogenic temperatures, which has not been feasible before and should be applicable during cool down of large liquid-argon TPCs

• Some thought is need to make it work in DUNE