Testing Plan at Bern Roman Berner | roman.berner@lhep.unibe.ch DUNE - - PowerPoint PPT Presentation

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Testing Plan at Bern Roman Berner | roman.berner@lhep.unibe.ch DUNE - - PowerPoint PPT Presentation

Nov 16, 2022 163 likes •433 views

Testing Plan at Bern Roman Berner | roman.berner@lhep.unibe.ch DUNE Near Detector Workshop, May 25 th 2019, Fermilab Purity Module Experiment February 25 th - March 15 th Operated 2x2 cryostat for 3 weeks Several extractions / insertions

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SLIDE 1

Roman Berner | roman.berner@lhep.unibe.ch DUNE Near Detector Workshop, May 25th 2019, Fermilab

Testing Plan at Bern

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SLIDE 2

May 25th, 2019 Dune Near Detector Workshop | Fermilab 2

Purity Module Experiment

February 25th - March 15th

  • Operated 2x2 cryostat for 3 weeks
  • Several extractions / insertions

→ gained experience in those tasks

  • Learned a lot about the properties of 2x2

(e.g. heat-losses, etc.)

  • Found many weak points / possible points
  • f improvement

First module extraction

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SLIDE 3

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 3

Module Tests in Bern – Weak Points

  • Copper dust from LAr filters
  • High noise level from pump VFD

→ electrically isolated pump and shield lines → moved pump further away

  • Cryostat exhaust valve

→ got stuck several times

  • Liquid check-valves for level/pressure-control

→ not possible for manual control

  • Panel-wall design had many leak paths
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SLIDE 4

May 25th, 2019 Dune Near Detector Workshop | Fermilab 4

Copper Dust

Cathode of the 60 cm drift TPC in the module Scintillator tile on top of the TPC

Copper dust in module originating from LAr purification filters (picture taken after purification was running for ~50 hours) → developing new filters incorporating a particle trap

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SLIDE 5

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 5

New LAr Filter Design

Special thanks to Fritz

→ New design with particle trap is ongoing (using either sintered material or membrane)

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SLIDE 6

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 6

Electrical Noise from Pump VFD

Problem: Pump’s power supplies (3 phases) and detector need separate GND → electrically isolate pump (only possible for recirculation pump)

Recirculation pump Sump pump

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SLIDE 7

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 7

Electrical Isolation of Pump

  • VFD in between line reactors

reduce voltage spikes →

  • Power GND, motor and cable shield on same potential
  • Minimise length of unshielded phase wires

Grounding scheme by T. Nichols

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SLIDE 8

May 25th, 2019 Dune Near Detector Workshop | Fermilab 8

Cryostat Gas Exhaust-Valve

Sketch by F. Piastra

Custom designed valve with steel shaft and brass guide

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SLIDE 9

May 25th, 2019 Dune Near Detector Workshop | Fermilab 9

Liquid Check-Valves

Start pump motor 0 Hz 20 Hz → 20 Hz 40 Hz → 40 Hz 20 Hz → 20 Hz 25 Hz → 25 Hz … 60 Hz → → Module gas exhaust: open, close, open 5.5 cm

P~5.5 mbar Δ

LAr levels cryostat

  • module

LAr purification increased module pressure up to ~11 mbar (w.r.t. cryostat) → liquid check-valves opened → LAr level in module decreased by ~10 cm (w.r.t. cryostat) → Problem: Suck in dirty Argon when stopping recirculation → developed manually controllable cryogenic control-valves

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SLIDE 10

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 10

Liquid Control-Valves

Developed liquid control-valve in order to control the LAr level in the module EM controlled, bi-stable check-valve: Either fully open or close (no intermediate state) → valves enable more complex cryogenics scheme

Designed by I. Kreslo

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SLIDE 11

Cryogenics Scheme for 2x2

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SLIDE 12

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 12

Cryogenics Scheme for 2x2

X control-valve CV check-valve FM flow meter Connections below dummy flange: coiled flexible steel lines

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SLIDE 13

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 13

Cryogenics Scheme for 2x2 – Module Insertion

Connections below dummy flange: coiled flexible steel lines – active line – inactive line X control-valve CV check-valve FM flow meter

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SLIDE 14

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 14

Cryogenics Scheme for 2x2 – Module Extraction

Connections below dummy flange: coiled flexible steel lines – active line – inactive line X control-valve CV check-valve FM flow meter

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SLIDE 15

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 15

Cryogenics Scheme for 2x2 – Recirculation

Connections below dummy flange: coiled flexible steel lines – active line – inactive line X control-valve CV check-valve FM flow meter

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SLIDE 16

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 16

Cryogenics Scheme for 2x2 – Refilling

Connections below dummy flange: coiled flexible steel lines – active line – inactive line X control-valve CV check-valve FM flow meter

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SLIDE 17

Cryogenics Scheme for Experiment in July

Looks different. Want to test:

  • Coiled flexible steel lines below dummy flange
  • Module filling through filter
  • Pressure control through filter
  • New filters
  • New PLC
  • New cryostat gas exhaust valve
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SLIDE 18

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 18

Cryogenics Scheme – For Run in July

X control-valve CV check-valve FM flow meter Connections below dummy flange: coiled flexible steel lines

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SLIDE 19

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 19

Cryogenics Scheme – Module Insertion

To be tested in July

– active line – inactive line X control-valve CV check-valve FM flow meter

To be tested: Using this line for pressure / level control between cryostat & module (see p. 26)

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SLIDE 20

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 20

Cryogenics Scheme – Module Extraction

To be tested in July

– active line – inactive line X control-valve CV check-valve FM flow meter

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SLIDE 21

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 21

Cryogenics Scheme – Recirculation

To be tested in July

– active line – inactive line X control-valve CV check-valve FM flow meter

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SLIDE 22

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 22

Cryogenics Scheme – Refilling

To be tested in July

– active line – inactive line X control-valve CV check-valve FM flow meter Filling module through filters

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SLIDE 23

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 23

Module Pressure Control

  • LAr level in cryostat controlled by

reservoir above cryostat

  • Refilling module with LAr from cryostat

(through filter, see previous slide)

  • Module and cryostat pressure control

via PR1 and PR2 (possibly also through filter – see p. 23)

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SLIDE 24

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 24

Bern Experiment in July

  • Test charge R/O:

→ Sheffield wire plane with latest BNL ASICS → DAQ from ArgonTube

  • Ideally test field-shell produced by SLAC

(schedule might be too tough though)

Sheffield wire plane SLAC lamination

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SLIDE 25

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 25

Bern Experiment in July

New PLC (from FNAL) → simplifies 2x2 integration at FNAL Installation in Bern done by Trevor Nichols in May → simplified integration when 2x2 is shipped to FNAL

FNAL PLC rack PLC rack touchscreen

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SLIDE 26

May 22nd, 2019 Dune Collaboration Meeting | Fermilab 26

Timeline

July:

  • New cryostat gas phase exhaust valve
  • New designed LAr purification filters
  • Test new designed liquid control-valves and new cryogenics scheme
  • Test module pressure regulation in gas phase as well as through filter
  • Test new installed FNAL PLC
  • Test Sheffield wire plane with latest BNL ASICS

and ideally test field shell produced by SLAC August / September:

  • Cryostat and associated infrastructure ready for 2x2

(modifications on top flange for recirculation pump are required) Afterwards:

  • Module assembly for 2x2 to be sent to FNAL