TTLink and Bias cables installation 4 l Extensive tests on TT-Link - - PowerPoint PPT Presentation

Status of TTLink and Wires bias cabling

1. Installation of the TTLink and Wire bias cables 2. Noise measurements using the TTLink 3. Tests to verify the impact on the noise measurements TPC WG WA104/ICARUS Technical Working Group Meeting October 30th 2019

4

TTLink and Bias cables installation

Slide# : 2

l Extensive tests on TT-Link distribution by their fan-outs showed no problem

• n the signal propagation to mini-crates, as checked with oscilloscope.

l All TT-Link cables have been deployed, connected to the TT-Link fan-out modules and labeled: ready to be connected to the mini-crates. l Few cables showed unstable signals due to a not perfect lemo-connector

• crimping. According to the last Howard’s communication, they have been

fixed: they will be checked the next time. l All bias cables have been deployed. The plug-in on the flanges will be realized by a more flexible 30 cm extension cable mechanically constrained to the mini-crate wall, which will guarantee a reduced stress to the SMA connectors in the flanges l As a general remark, we found some broken cables and DAQ fibers on the top

• f the detector, probably related to the ongoing cryo activities. For these

reasons, we have to connect cables and fibers after the completion of ALL the installation/LAr commissioning activities.

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TTLink tests

Slide# : 3

l New noise measurements performed in the mini-crates to test the installed TT-Link cables; two mini-crates have been simultaneously collected

ü One mini-crate (EW03 for cryo East and WE03 for cryo West) was used to

generate/propagate the TT-Link signal in the cryostat; the second mini- crate (under test) is changed at each run; l Noise consistent with the previous measurements (collected in May/June/ July/September) in most of the mini-crates; in some cases we found different noise conditions

channel

RMS (#ADC)

EW20Top the

noise in these measurement (red) is higher

RMS (#ADC)

channel

EW01Bottom

• ld measurement,

recent measurement

channel

RMS (#ADC)

EE08

• ld measurement,

recent measurement

RMS (#ADC)

channel

WE20Top

• ld measurement,

recent measurement

RMS (#ADC)

channel

WW02

• ld measurement,

recent measurement

channel

RMS (#ADC)

EE20M

RMS (#ADC)

channel

EE18

• ld measurement,

recent measurement

• ld measurement,

recent measurement

RMS (#ADC)

channel

EE13

• ld measurement,

recent measurement TESTED individually with

• ld data acquisition: no

change

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TTLink tests – noise measurement results

Slide# : 4

WW17

• ld measurement,

recent measurement

channel

RMS (#ADC)

channel

RMS (#ADC)

4

Slide# : 5

l Noise measurements performed to verify the possible effect introduced setting a 20 Volt voltage to the wires: Ø 2 mini-crates testes (EW05 and EW06) Ø some effects visible only on one board in EW05

EW05 No bias cables connected, Bias cables connected, 0 V Bias cables connected, 20V

l Noise measurements performed to verify the possible effect introduced switching on and off the cryo box near EW01:

channel

RMS (#ADC)

EW01T Cryo box off, Cryo box on EW03

Additional tests to verify the effect on the wire noise

channel

RMS (#ADC)

EE20T Cryo box off, Cryo box on

4

Slide# : 6

l Noise measurements performed in EE20M to verify the effect of the introduction of 2d grounding strap to the mini-crate: Ø the channels with anomalous RMS value disappear demonstrating a more stable condition Ø Connection of all straps will be performed

channel

RMS (#ADC)

Standard condition, Introducing the 2nd grounding strap EE20M

l Noise measurements performed to verify the possible effect introduced switching on and off the cryo box near EE20T l The cryo box is for sure a relevant noise source. Its position and wiring must be studied in order to eliminate the effect

Additional tests to verify the effect on the wire noise

l Noise measurements performed to verify the possible effect introduced by PMTs activation. Two groups of 5 PMTs connected to WW14 (high voltage)/ WW15(signal) switched on and noise measurements performed with: Ø PMTs off (black points) Ø PMTs on (red points) Ø PMTs on and 50 Hz laser on (blue points)

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Noise measurements switching on the PMTs

Slide# : 7

RMS (#ADC)

channel

l A similar test was performed few month ago studying only one mini crate (WW13) and no effect was seen in the comparison PMT off/on

RMS (#ADC)

channel

WW16

4

Noise measurements switching on the PMTs

RMS (#ADC)

channel

WW14

channel

RMS (#ADC)

WE15

l First test with 5 PMTs on: change of the noise condition on 1 board in WE14 (with the laser on) and on 1 board in WE16 (with the PMTs on) l Looking to the results of the previous test, we decide to repeat the test on WW14, switching on the second group

• f 5 PMTs

l The effect on WW14 is more evident and in this case it is present also when the PMTs have been switched on l No effect visible on WW13

RMS (#ADC)

channel

Slide# : 8

WW14 Effect activating the second group of 5 PMTs