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 30 th 2019
TTLink and Bias cables installation 4 l Extensive tests on TT-Link distribution by their fan-outs showed no problem on 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 of 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. Slide# : 2
TTLink tests 4 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 RMS (#ADC) RMS (#ADC) RMS (#ADC) EW01Bottom EE08 EW20Top the old measurement, noise in these old measurement, recent measurement measurement recent measurement (red) is higher channel channel channel Slide# : 3
TTLink tests – noise measurement results 4 RMS (#ADC) RMS (#ADC) EE13 RMS (#ADC) old measurement, recent measurement old measurement, WE20Top recent measurement TESTED individually with old measurement, old data acquisition: no recent measurement WW02 change channel channel channel RMS (#ADC) EE18 RMS (#ADC) EE20M RMS (#ADC) WW17 old measurement, old measurement, old measurement, recent measurement recent measurement recent measurement channel channel channel Slide# : 4
Additional tests to verify the effect on the wire noise 4 RMS (#ADC) l Noise measurements performed to verify EW05 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 No bias cables connected, in EW05 Bias cables connected, 0 V Bias cables connected, 20V channel RMS (#ADC) EW01T Cryo box off, Cryo box on l Noise measurements performed to verify the possible effect introduced switching on and off the cryo box near EW01: EW03 channel Slide# : 5
Additional tests to verify the effect on the wire noise 4 RMS (#ADC) EE20T 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 Cryo box off, relevant noise source. Its Cryo box on position and wiring must be studied in order to eliminate channel the effect RMS (#ADC) l Noise measurements performed in EE20M 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 Standard condition, more stable condition Introducing the 2 nd grounding strap Ø Connection of all straps will be channel performed Slide# : 6
Noise measurements switching on the PMTs 4 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) 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 Slide# : 7
Noise measurements switching on the PMTs 4 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) RMS (#ADC) RMS (#ADC) RMS (#ADC) WW14 WW16 WE15 channel channel channel l Looking to the results of the previous RMS (#ADC) test, we decide to repeat the test on WW14 WW14, switching on the second group Effect activating the of 5 PMTs second group of 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 channel l No effect visible on WW13 Slide# : 8
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