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

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

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.

• Each termometer is made up of four sensor at

different heights wrt the CRP

100 mm 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

Day Runs Approx hours Grid V [kV] Cathode [kV] 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)

LM_DC 2 (mm) 10/07 Mean

16.960

RMS

0.005

14/07 Mean

16.959

RMS

0.004

19/07 Mean

16.959

RMS

0.002

20/07 Mean

16.959

RMS

0.002

25/07 Mean

16.961

RMS

0.001

26/07 Mean

16.962

RMS

0.003

27/07

Mean 16.958 RMS 0.002

Levelmeters

Overall good stability. Nothing remarkable concerning levelmeters

PE0001 (atm) PE0003 (atm) PE0005 (atm) 10/07 Mean

4.947 4.926 4.947

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

RMS

1.950e-06 1.007e-06 0.0560

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

Insulator 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

RMS Stability: Pressure

TH1 (K) TH2 (K)

• TH3 (K)
• TH4 (K)
• 10/07

Mean

105.404 103.034 105.910 102.907

RMS

0.016 0.020 0.020 0.020

14/07 Mean

105.634 103.207 106.127 103.044

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

25/07 Mean

103.289 101.500 103.692 101.142

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

Temperature on CRP

Temperature is decreasing TH on the CRP used as reference.

10/07 14/07 19/07 20/07 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)

RMS Stability: CRP temperature

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
• bserved on the CRP temperature rms and mean oscilla;ons.

Thanks for your attention

Backup

• 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

1 point every 10m

Insulator pressure at 14/07

1 point every 10m

Insulator pressure at 20/07

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.

• PE0005 an;correlated with the atmospheric temperature

Insulator and atm. pressure at 19/07, 20/07, 25/07

CRP Termometers (20/07)