Operation meeting 07.07.2017 Kevin Fusshoeller, Laura Molina Bueno - - PowerPoint PPT Presentation

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Operation meeting 07.07.2017 Kevin Fusshoeller, Laura Molina Bueno - - PowerPoint PPT Presentation

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1 Summary HV Tests Operation meeting 07.07.2017 Kevin Fusshoeller, Laura Molina Bueno 2 Schematics of the detector and HV configuration Anode (nominal voltage: 0V) 2mm 1mm LEM nominal voltage: -1 kV (up) and -4kV (down) Gas Argon 5 mm

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SLIDE 1

Summary HV Tests Operation meeting 07.07.2017 Kevin Fusshoeller, Laura Molina Bueno

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SLIDE 2

Liquid Argon Gas Argon PMT‘s Cathode (nominal voltage: -56kV) Extraction Grid (nominal voltage: -6.5kV) LEM nominal voltage: -1 kV (up) and -4kV (down) Anode (nominal voltage: 0V)

e-

First Field Shaper (FFS) (nominal voltage: -7.5kV) 2mm 1mm 5 mm 5 mm 20 mm 1m

Schematics of the detector and HV configuration

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SLIDE 3

Cathode (nominal voltage: -56kV) Extraction Grid (nominal voltage: -6.5kV) Anode (nominal voltage: 0V) First Field Shaper (FFS) (nominal voltage: -7.5kV) CAEN CAEN 0.5 GΩ 0.5 GΩ

160 MΩ 150 MΩ 130 MΩ 110 MΩ

CAEN x 20 -> 2 GΩ 100 MΩ 100 MΩ

Heinzinger

x 20 -> 2 GΩ Total resistance: 1 GΩ spare Max: 8kV, 20 µA Resolution: 50 pA Max: 12kV, 100 µA Resolution: Max: 300 kV, 500 µA Resolution: 1 kV, 1 µA LEM Down (nominal voltage: -4 kV) LEM Up (nominal voltage: -1 kV)

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10 GΩ

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SLIDE 4

LEM Mapping

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Comment: The interlock is set, such that as soon as the current on a LEM exceeds 0.2 µA (trip value), the power supply is shut down (trip).

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SLIDE 5

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Cathode Voltage [kV] FFS Voltage [kV] Grid Voltage [kV] LEM Voltage [kV] Drift Field [V/cm] Extraction in Liquid [kV/cm] Amplification [kV/cm] Induction Field [kV/cm] Comments Down Up 55 2.75 4.5 2.6 0.1 550 1.54 25 0.5 Highest Drift Field achieved. 48 6.5 5.3 1.9 480 2.99 19 Highest extration while powering all the HV system. 35 4.7 4.1 3.1 0.2 350 1.53 29 1 Highest amplification achieved when powering all the HV system. 37 5 ~4.0 ~3.1 0.2 370 1.08 29 1 For now most stable configuration for data taking. 50 6.75 5.5 500 4.8 Highest grid and FFS voltage achieved when powering only grid and cathode. Achieved with 6 mm of liquid above the grid. 4.2 3.3 0.3 0.9 30 1.5 Highest amplification. Achieved when the cathode was not powered. 4.6 4.5 /

Summary of achieved HV configurations

Case 1) Normal operation: Cathode powered with FFS connected, Grid powered, LEM down and up powered Case 2) Only Cathode and Grid powered. Case 3) Only Grid and LEM powered. Case 4) Only Grid powered.

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SLIDE 6

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  • 1. The grid is the most sensible part of the HV system. In all the tests performed, the grid is the first to trip.

HV Tests: Lessons learned

trips

Extraction grid: Test of 30.06

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SLIDE 7

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HV Tests: Lessons learned

  • 2. The maximum voltage reachable on the grid depends on the liquid level.

(LEMs always grounded)

We need to have at least 5 mm

  • f liquid above the grid to

reach voltages larger than 4 kV.

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SLIDE 8

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HV Tests: Lessons learned

  • 3. No obvious correlation between trips and short-time variations of the level, as soon as

the grid is immersed. LM-CRP8 Grid Voltage

Level very stable.

Extraction grid and Level (29.06)

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SLIDE 9

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HV Tests: Lessons learned

  • 4. When the grid trips, we can also have LEMs tripping. This can happen at the same time or with a delay.

Grid trips first LEM 6 up and down trip at the same time 5 mins later LEM 8, 11 up and down trip, as well as LEM 2,4,5, 7 down.

All LEMs (top: up LEMs; bottom: down LEMs) 05.07

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SLIDE 10

Grid connection Inside Grid connection Inside

HV Tests: Lessons learned

  • 5. Depending on which grid connection is used, different LEMs tripped early.

LEMs and FFS at ground during this test.

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SLIDE 11

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HV Tests: Lessons learned

  • 6. Summary of LEM trips induced after the grid tripped.

0 trips 4 trips 0 trips 4 trips 0 trips 4 trips 1 trip1 5 trips 0 trips 3 trips 2 trips 6 trips 5 trips 13 trips 0 trips 4 trips 1 trip 5 trips 2 trips 12 trips 1 trip 2 trips 0 trips 2 trips

Plot of the LEM‘s, the liquid level and the number of trips for all tests. The brightest regions are the least immersed and the darkest the most immersed. The least immersed level meter is CRP8, the most one is CRP7.

CRP2 CRP3 CRP1 CRP5 CRP6 CRP7 CRP8 LEM Up LEM Down

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SLIDE 12

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Conclusion and future prospects

  • The instability of the grid is the biggest challenge so far. We are investigating this issue

to understand the source of the problem.

  • We will take data at different stable high voltage configurations to define the best

settings.

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SLIDE 13

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Backup HV Tests of last week

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SLIDE 14

Day Level (CRP 8) [mm] Liquid above Grid [mm] Grid Voltage [kV]

LEM Voltage [kV]

FFS Voltage [kV]

Delta V [kV]

Tracks Run Info Down Up Grid – LEM LEM - LEM 28.06 16.9 9.4

  • 4.9
  • 5.4
  • 4.9

0.0 / 10 GOhm resistor connected to grid. The grid and all the LEM down tripped. 28.06 16.9 9.4

  • 4.9
  • 5.4
  • 4.9

0.0 / Grid disconnected from 10 GOhm resistor. LEM 3 and 8 trip with the grid. 28.06 16.9 9.4

  • 4.9
  • 5.4
  • 4.9

0.0 / We used the other flange connection to power the

  • grid. The grid tripped and

again LEM 3 and 8 trip with the grid. 28.06 16.9 9.4

  • 1.5
  • 1.5

0.1 2.7 1.4 / Stable configuration for 15h 29.06 16.9 9.4

  • 3.9
  • 2.8
  • 0.2
  • 4.9
  • 1.1
  • 2.6

Yes DAQ turned on during all tests and data constantly

  • taken. LEM down 10

tripped with Grid.

Summary of the tests.

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SLIDE 15

Day Level (CRP 8) [mm] Liquid above Grid [mm] Grid Voltage [kV] LEM Voltage [kV] FFS Voltage [kV] Delta V [kV] Tracks Run Info Down Up Grid – LEM LEM - LEM 29.06 16.9 9.4

  • 4.5

LEM 1,3,12: - 2.8 LEM 10: -2.7 All other: -3.0

  • 0.2
  • 5.5

Max: -1.8 Max: -2.8 Yes DAQ on Grid tripped, then LEM 10 down, then LEM 5-8 down, then LEM 10 up 30.06 16.9 9.4

  • 4.0
  • 3.0
  • 0.4
  • 4.9
  • 1.0
  • 2.6

Yes Positive PMT‘s on. Data taken for a few minutes. Then only the grid tripped. 30.06 16.9 9.4

  • 3.8
  • 3.1
  • 0.4
  • 4.9
  • 0.7
  • 2.7

Yes Data taken for a few

  • minutes. Then the grid and

LEM 10 up and down tripped. 30.06 16.9 9.4

  • 3.8
  • 3.0
  • 0.2
  • 4.0
  • 0.8
  • 2.8

/ Positive PMT‘s turned off. Grid and LEM down 6 tripped. 30.06 16.9 9.4 1.5 1.5 0.1

  • 2.7

1.4 / HV was left on during the whole night. Electronics were switched on but no data was taken. Everything was stable.

Summary of the tests

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SLIDE 16

Summary of the tests

Day Level (CRP 8) [mm] Liquid above Grid [mm] Grid Voltage [kV]

LEM Voltage [kV]

FFS Voltage [kV]

Delta V [kV]

Tracks Run Info Down Up Grid – LEM LEM – LEM 01.07 16.9 9.4

  • 4.1
  • 3.1
  • 0.2
  • 4.7
  • 1.0
  • 2.9

/ All PMT‘s off. Last configuration stable for 20

  • mins. The grid and LEM 7

down and up and LEM 4 down tripped, when the electronics were switched

  • n.

04.07 16.9 9.4

  • 4.6
  • 4.6

/ Only the grid was powered during this test and this through the connection in the north slow control

  • flange. It was stable at 4.0

kV for more than 2 hours. It tripped while ramping up to 4.8 kV. LEM 3 and 8 dwon tripped as well. 05.07 16.9 9.4

  • 4.2
  • 3.3

(LEM 1,3, 10, 12 at -2.9 kV)

  • 0.3
  • 0.9
  • 3.0 (Max)

/ Only the grid and the LEM were powered. When the grid tripped, LEM 6 up and down tripped as well. A few minutes later more LEMs trip: LEM 2, 4,5, 7 down; LEM 8, 11 up and down

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SLIDE 17

Run 3 29.06.2017 : Overview Grid and Level

LM-CRP8 Grid Voltage

Except for a big variation around 15:00, the level is very stable throughout the tests. In the box, we tripped with a delay in certain LEMs. (see next slide)

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SLIDE 18

HV Test 29.06: LEM Downs

Original trip Delayed trip

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SLIDE 19

04.07: Run with only the grid powered

Manage to reach extraction field of 4.5 kV/cm in the liquid

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SLIDE 20

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05.07: Only LEMs and Grid powered.

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SLIDE 21

05.07: Only LEMs and Grid powered.

Grid and LEM 6 up and down trip at the same time

LEM 6

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SLIDE 22

05.07: Only LEMs and Grid powered.

Original trip Delayed trip with response in the grid current.

LEM 8

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SLIDE 23

0 trips 3 trips 0 trips 2 trips 0 trips 2 trips 0 trips 2 trips 0 trips 2 trips 0 trips 2 trips 5 trips 9 trips 0 trips 1 trip 0 trips 1 trip 1 trip 6 trips 0 trips 0 trips 0 trips 1 trip

Reminder from last Operation meeting: Summary of trips on LEM

Plot of the LEM‘s, the liquid level and the number of trips. The brightest regions are the least immersed and the darkest the most immersed. The least immersed level meter is CRP8, the most one is CRP7.

CRP2 CRP3 CRP1 CRP5 CRP6 CRP7 CRP8

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LEM Up LEM Down

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SLIDE 24

0 trips 1 trip 0 trips 2 trips 0 trips 2 trips 1 trip 3 trips 0 trips 1 trip 2 trips 4 trips 0 trips 4 trips 0 trips 3 trips 1 trip 4 trips 1 trip 6 trips 1 trip 2 trips 0 trips 1 trip

Summary of trips on LEM 28.06 – 05.07

Plot of the LEM‘s, the liquid level and the number of trips. The brightest regions are the least immersed and the darkest the most immersed. The least immersed level meter is CRP8, the most one is CRP7.

CRP2 CRP3 CRP1 CRP5 CRP6 CRP7 CRP8

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LEM Up LEM Down

N S W