Pressure, temperature and level monitoring Andrea Scarpelli - PowerPoint PPT Presentation

Pressure, temperature and level monitoring Andrea Scarpelli APC-Paris • Quick update on the temperature, pressure and level varia;ons from the 19/07. • Few observa;ons about mean values and rms fluctua;ons in these runs.

Pressure in insulator PE0006 3 Differen;al Pressure sensors (insula;on-atmosphere) + Absolute pressure inside the tank PE006

Pressure insulator and tank PE0005 PE0001 PE0003 PE0006

Levelmeters • At LM-DC1 and LM-DC2 (LM-CRP8) the dri< cage and CRP respecAvely are closest to the gas. These two LM are therefore used as the reference

Levelmeters PVSS problems

CRP Temperature Sensors • 4 termometers located in 4 diffferent posi;on along the LEM. 100 mm • Each termometer is made up of four sensor at different heights wrt the CRP 50 mm 20mm ~0mm Red boxes gather the sensors recording the two highest temperature on each layer

CRP Termometers Same ;me of the varia;on in the levelmeters

CRP Termometers (layers) Same ;me of the varia;on in the levelmeters

Summary of the runs considered � Runs Approx hours Grid V [kV] Cathode [kV] Day � 10/07 764-768 13-17 4 35 14/07 781-782 16-18 4.4 40 19/07 783-796 17-21 4.3-5.5 50-56 20/07 797-809 17-20 4.6-5.3 56 25/06 832-838 19-22 4.7-5.1 57-67 26/07 839-840 19-04 27/07 5.1 56 27/07 841-843 11-19 5.0 56 • During runs taken from the 19th of July, an higher voltages on the grid were reached. • Mean and rms varia;ons of pressure, temperature and levelmeters during these tests were observed and compared to previous runs (14th and 10th July)

Levelmeters � LM_DC 2 (mm) � Overall good stability. Nothing remarkable 10/07 � Mean � 16.960 � concerning levelmeters RMS � 0.005 � 14/07 � Mean � 16.959 � 0.004 � RMS � 19/07 � Mean � 16.959 � RMS � 0.002 � 20/07 � Mean � 16.959 � 0.002 � RMS � 25/07 � Mean � 16.961 � RMS � 0.001 � 16.962 � 26/07 � Mean � RMS � 0.003 � 16.958 27/07 � Mean � RMS � 0.002

Insulator pressure � PE0001 (atm) � PE0003 (atm) � PE0005 (atm) � 4.947 � 4.926 � 4.947 � 10/07 � Mean � RMS � 0.534 � 0.547 � 0.534 � 14/07 � Mean � 3.956 � 3.748 � 3.946 � RMS � 0.430 � 0.429 � 0.427 � 19/07 � Mean � -19.997 � -20.020 � 1.621 � RMS � 1.336e-06 � 1.153e-06 � 0.040 � 20/07 � Mean � -20.000 � -20.020 � -0.330 � 1.950e-06 � 1.007e-06 � 0.0560 � RMS � 25/07 � Mean � -20.000 � -20.016 � -10.005 � RMS � 1.155e-06 � 8.903e-07 � 0.004 � 26/07 � Mean � -19.997 � -20.016 � -12.881 � RMS � 3.075e-06 � 1.106e-06 � 0.102 � 27/07 � Mean � -20.000 � -20.015 � -12.053 � RMS � 7.449e-07 � 1.226e-06 � 0.748 �

RMS Stability: Pressure 10/07 14/07 19/07 20/07 25/07 26/07 27/07 • 10/07 and 14/07 rms values have not a good stability in ;me. • From 19/07 PE0001, PE0003 nice stability over ;me - vacuum provides a be^er control over the fluctua;ons

� � � TH on the CRP used Temperature on CRP � as reference. TH1 (K) � TH2 (K) � TH3 (K) � TH4 (K) � 10/07 � Mean � 105.404 � 103.034 � 105.910 � 102.907 � 0.016 � 0.020 � 0.020 � 0.020 � RMS � 14/07 � Mean � 105.634 � 103.207 � 106.127 � 103.044 � Temperature is decreasing RMS � 0.0018 � 0.002 � 0.002 � 0.002 � 19/07 � Mean � 104.290 � 102.267 � 104.730 � 101.936 � RMS � 0.001 � 0.002 � 0.001 � 0.001 � 20/07 � Mean � 104.239 � 102.222 � 104.674 � 101.917 � RMS � 0.005 � 0.009 � 0.009 � 0.008 � 103.289 � 101.500 � 103.692 � 101.142 � 25/07 � Mean � RMS � 0.001 � 0.001 � 0.001 � 0.001 � 26/07 � Mean � 103.168 � 101.398 � 103.564 � 101.042 � RMS � 0.005 � 0.0116 � 0.007 � 0.0115 � 27/07 � Mean � 103.100 � 101.336 � 103.503 � 100.994 � RMS � 0.004 � 0.006 � 0.005 � 0.006 �

RMS Stability: CRP temperature 14/07 10/07 20/07 19/07 25/07 26/07 27/07 • In general rms of temperature is qute stable. • More oscilla;ng rms seems not obvioulsy related to a specific event (eg: vaacum in the previous case)

Observations � • Rou;ne plots do not highlight any major issue • Insulator pressure: in vacuum from 19/07. Mean and rms were lower and more stable over ;me (for PE0001,PE0003). • Levelmeter LM_DC2does not show any remarkable varia;on between the runs • Although a small decreasing trend of the temperature (a couple of K), any clear difference cannot be observed on the CRP temperature rms and mean oscilla;ons.

Thanks for your attention �

Backup �

Insulator pressure at 14/07 1 point every 10m • Fast drop of the insula;on pressure might be correlated with atm pressure decrease (same as for 14/07) • Overall RMS pressure oscilla;on is less stable over ;me. Average RMS over the full period is lower than 10/07

Insulator pressure at 20/07 1 point every 10m 1 point every 10m • PE0001, PE0003 stability over ;me - it seems that vacuum provides a be^er control over the fluctua;ons • For PE0005 the same behaviour of the past runs can more or less be observed.

Insulator and atm. pressure at 19/07, 20/07, 25/07 • PE0005 an;correlated with the atmospheric temperature

CRP Termometers (20/07)