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

Electrical Method: Description of the system 3% resolution arXiv:1804.05941 [physics.ins-det]

Performance of the system ß Dependency on V AC and V DC Dependency on wire length à

Electrical Method: Setup Connector for SBND boards About 40 seconds to scan a frequency range of 45 Hz (32 wires in parallel) SBND test frame

Example of one (of 32) signals measured simultaneously in 40 seconds Channel Number 13 880 ADC Steps 860 840 820 800 780 760 740 720 115 120 125 130 135 140 145 150 Frequency [Hz] 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

Example of 30 (of 32) signals measured simultaneously in 40 seconds Channel Number 1 Channel Number 2 Channel Number 3 Channel Number 4 Channel Number 5 Channel Number 6 300 300 ADC Steps ADC Steps ADC Steps ADC Steps 382 ADC Steps ADC Steps 380 345 420 380 298 298 378 340 375 296 415 296 376 374 294 335 294 370 410 372 292 370 292 330 405 368 365 290 290 366 325 400 288 364 360 288 144 146 148 150 152 144 146 148 150 152 118 120 122 124 126 128 142 144 146 148 150 152 136 138 140 142 144 146 136 138 140 142 144 146 Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Channel Number 7 Channel Number 8 Channel Number 9 Channel Number 10 Channel Number 11 Channel Number 12 ADC Steps ADC Steps ADC Steps ADC Steps 362 ADC Steps ADC Steps 346 370 350 425 395 360 344 348 358 342 346 420 365 356 390 340 344 354 338 342 415 352 385 336 360 340 350 334 338 410 348 332 380 336 355 346 330 334 344 328 405 375 332 342 326 350 136 138 140 142 144 146 134 136 138 140 142 144 128 130 132 134 136 138 132 134 136 138 140 142 132 134 136 138 140 142 130 132 134 136 138 140 Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Channel Number 13 Channel Number 14 Channel Number 15 Channel Number 16 Channel Number 17 Channel Number 18 350 ADC Steps ADC Steps ADC Steps ADC Steps ADC Steps ADC Steps 405 435 415 415 395 345 400 430 410 410 390 395 340 425 405 405 385 400 390 335 420 400 380 395 385 330 415 395 375 390 390 128 130 132 134 136 138 140 122 124 126 128 130 132 126 128 130 132 134 136 124 126 128 130 132 134 136 136 138 140 142 144 146 126 128 130 132 134 136 Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Channel Number 19 Channel Number 20 Channel Number 21 Channel Number 22 Channel Number 23 Channel Number 24 375 ADC Steps ADC Steps ADC Steps ADC Steps ADC Steps ADC Steps 355 375 340 355 370 370 370 350 335 365 350 365 365 345 330 360 345 360 360 340 355 325 340 355 355 350 320 335 335 350 350 118 120 122 124 126 128 130 118 120 122 124 126 128 118 120 122 124 126 128 130 122 124 126 128 130 132 122 124 126 128 130 132 120 122 124 126 128 130 132 Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Channel Number 25 Channel Number 26 Channel Number 27 Channel Number 28 Channel Number 29 Channel Number 30 398 430 ADC Steps ADC Steps ADC Steps ADC Steps ADC Steps ADC Steps 360 356 396 355 390 425 354 394 355 392 352 350 385 420 390 350 388 350 348 380 415 345 386 346 384 344 375 410 345 382 340 342 380 340 370 405 340 378 338 335 376 365 400 336 120 122 124 126 128 130 114 115 116 117 118 119 120 121 122 118 120 122 124 126 128 122 124 126 128 130 132 122 124 126 128 130 132 114 115 116 117 118 119 120 121 122 123 Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency [Hz] 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

Cryogenic test • Stainless-steel bar (piece of “real” frame) with copper beryllium wires • Vacuum jacketed dewar • Four temperature sensors (PT1000) at different heights connected to DAQ Frame with CuBe wires ~ 20% PT1000 ~ 6% resistors Inside the dewar

First results with 5mm wire pitch DC voltage = 210 V; AC amplitude = 80 V; Wire Length = 1.4 m (typical DUNE segment length) Channel Number 11 Channel Number 13 ADC Steps ADC Steps 760 1080 1075 755 1070 750 1065 1060 745 1055 1050 740 59.2 59.4 59.6 59.8 60 60.2 60.4 60.6 60.8 61 57.2 57.4 57.6 57.8 58 58.2 58.4 58.6 58.8 59 59.2 Frequency [Hz] Frequency [Hz] Channel Number 18 Channel Number 16 1155 ADC Steps ADC Steps 1135 1150 1130 1145 1125 1140 1120 1115 1135 1110 1130 1105 1125 1100 1120 1095 1115 57 57.2 57.4 57.6 57.8 58 58.2 58.4 58.6 58.8 53.2 53.4 53.6 53.8 54 54.2 54.4 54.6 54.8 55 55.2 Frequency [Hz] Frequency [Hz]

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 other experts and the Consortium (not a Manchester only task). • We will need to be relatively fast at this point to make it for TDR.

Design considerations (wire-bonding board): PCB copper clearance/creepage • Which standard for PCB clearance and creepage? IPC-2221B (Generic • Standard on. Printed Board X plane - Worst case Design): 500V = 2.5mm • Some examples of the V / U plane 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 G plane – Not possible in current design arrangement. (4-wires in parallel)

Design considerations (CR boards): PCB copper clearance / creepage • Which standard for PCB X / V / U 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, • Connection here so only AC component U plane from the back side of the present at connector APA Signal readout channels board (possible?)

Design considerations: Connectivity Need to be able to connect before • the capacitor on planes with RC components • Would require additional connector on the RC board or a board that can piggyback on the existing Mil-Max pins APA Signal readout channels • Pogo-pins are an option for this APA wire signals

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 of 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