Cryogenic Instrumentation & Slow Controls (CISC) Overview & - - PowerPoint PPT Presentation

Cryogenic Instrumentation & Slow Controls (CISC)

Overview & Status

Sowjanya Gollapinni (UTK)

CISC Scope Review Meeting CERN, June 19, 2019

CISC Primary goals

• DUNE CPV and other physics goals require at least a decade of running the

FD during which time we don’t have access to the interior of the cryostat

• Environmental conditions that present risks to the detector must be detected

and reported quickly and reliably during this time

• Each element of CISC contributes to the DUNE physics program

primarily through the maintenance of high detector live time

• CISC provides comprehensive monitoring for all detector elements, and

for LAr quality and behavior (can be used to constrain detection efficiency and fiducial volume), and a control system for many of the detector components

• ….plus many special cases

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(from Glenn; format modified)

Physics Connections

CISC Scope

(Single-Phase)

• Joint consortium for SP and DP
• This talk only focusing on “CI” in CISC
• General strategy: For all systems, design

validation and testing at ProtoDUNE-I (ongoing) and ProtoDUNE-II (anticipated)

LBNF scope

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Pressure Meters (GAr; LBNF)

CISC Organization

• G. Horton-Smith
• C. Palomares
• S. Gollapinni, A. Cervera
• C. Lane
• A. Habig
• S. Gollapinni
• H. Liao,
• P. Fernandez
• J. Maricic, J. Bian
• M. Dolinski,
• A. Hahn,

(D. Montanari for LBNF)

• A. Habig, J. Haigh
• C. Mariani
• G. Horton-Smith, F. Blaszczyk

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Spain (2), UK (2) and USA (15)

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CISC Organization

Spain (2), UK (2) and USA (15)

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CISC Organization

• Continuing contract with SDSU to perform fluid

flow simulations needed for the consortium for ProtoDUNE and FD, for both SP and DP

• Became a member of the consortium recently to

better integrate into CISC activities

• In communication with Erik Voirin for

confirmations/verifications on simulations

CFD Simulations

CISC Scope (SP Vs DP)

SP DP

Note: DP not as advanced as SP — final configuration and some design aspects need more work

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Pressure Meters (GAr; LBNF) Pressure Meters (GAr; LBNF)

CISC (SP Vs DP)

• Longer drift length in DP (12 m); much higher electric potential than SP
• Space along long sides is larger than SP, but less along the short sides
• The cryostat and the cryogenics design is the same as SP — good thing!
• GAr instrumentation to understand behavior of LEM mechanical structure
• Many things yet to be finalized, e.g.
• A nominal port map with final standard assignments is not yet available
• Not all detector element designs are finalized — hard to understand mechanical

clashes and other installation interfaces

• Disclaimer: Given the above, we had to make some assumptions (e.g. port

locations) for DP which needs to be confirmed later once more information is available.

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TDR Status

• TDR progress on track,

meeting all deadlines!

• Both SP and DP drafts

currently under LBNC review, submitted on May 3

• Costing and interface

documents going through final review TDR draft SP DP 1st draft 30-Nov-18 5-April-19 2nd draft 11-Jan-19 1-May-19 LBNC-1 25-Jan-19 3-May-19 LBNC-review-1 28-Feb-19 N/A 3rd draft 15-April-19 N/A Collaboration Internal review 3-May-19 3-May-19 LBNC-2 3-May-19 TBD LBNC-review-2 TBD TBD

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Note: The CISC scope and plans presented today follow what we have in the TDR currently plus some additional studies to further motivate the systems

Purity Monitors

• Purity Monitors (in cryostat) — not replaceable
• Quick, but localized, purity measurement
• Used to constrain fluid flow simulations
• Measure purity stratification (if any)
• Primary use for operations (e.g. monitor LAr filling) and data quality checks
• Can raise alarms about cryogenics systems
• can aid calibration and recirculation studies by benchmarking some purity values
• most useful during commissioning & early data taking — not required to survive the

lifetime of the experiment but would be great if they did!

• Purity Monitors (inline) — replaceable
• Immediate alarms about cryogenics systems (gas analyzers also provide alarms for

this)

• Can be replaced and thus can be maintained for the lifetime of the experiment

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Purity Monitors @ ProtoDUNE

• Purity Monitors are deployed in both PD-SP and PD-DP
• Currently, PD-SP and PD-DP are using slightly different designs and

distribution:

• Cryostat: PD-SP uses 3 monitors/string and a gold photocathode; Inline: 0
• Cryostat: PD-DP uses 2 monitors/string and gold & silver photocathodes; Inline: 0
• PD-SP validated the design and currently performing data analysis

ProtoDUNE-SP

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ProtoDUNE-SP

Includes statistical errors (see backup)

Purity Monitors @ FD

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PrM PrM

Use opposite set of human access ports

• Use the same design as PD-SP; Total 8 monitors (6 in cryostat and 2 inline)
• The exact locations of deployment and suitable ports is yet to be finalized for cryostat monitors
• One PrM string on east and one on west — provides two reference points in the cryostat and each vertical

string with monitors at different heights enables addressing any stratification issues

• Need dedicated ports for straight deployment — No ports currently assigned for this, so human access

ports are the current option

• Inline monitors located before and after LAr filling
• Some improvements planned such as longer drift purity monitors to increase the range of measured lifetime

values, improved light source etc. — The PD-SP-II and PD-DP-II runs post-LS2 will provide opportunities to test improved designs.

Charge Questions: Purity Monitors

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Detailed talk by Jianming Bian in the dedicated Purity Monitors talk in the afternoon

Temperature Monitors

• High precision 3D temperature map of the cryostat is useful to understand the behavior of
• LAr recirculation
• Purity prediction far from PrMs, using CFD simulations validated with temperature

measurements

• Cryostat membrane behavior in cold
• All of which impact physics (electron lifetime, drift velocity and thus FV etc.)
• Extrapolate from ProtoDUNE-SP. Three types of devices — each has a specific purpose
• Static T-Gradient Monitor: Vertical array with laboratory calibration
• Dynamic T-Gradient Monitor: Vertical array with in-situ calibration
• Individual sensors (roof, wall, floor, ullage): Coarser horizontal 2D array with varying

precision

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Purpose of various Thermometers

(Slide from A. Cervera)

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Thermometry @ ProtoDUNE-SP

(From Anselmo)

ProtoDUNE-SP Detector

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Validation @ ProtoDUNE-SP

Static T-gradient system Several calibration methods being deployed (laboratory Vs pump on/off) 2-3 mK relative precision achieved Comparison to CFD has reasonable agreement, more work ongoing to better understand boundary conditions e.g. pressure, heat load etc.

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Update with most up-to- date plots from ACV

(From Anselmo)

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Baseline Thermometer distribution @ FD-SP

Maximum sensor configuration, probably not all needed (see alternative configuration in backup)

To-do: update with the less-busy version from Anselmo

Baseline Thermometer distribution: FD-SP Vs FD-DP

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Distribution yet to be finalized, expect might need fewer thermometers in the end

FD-DP FD-SP

*Dynamic T-gradient thermometers not shown in DP — yet to be understood

To-do: for the top one, update with the less-busy version from Anselmo

Thermometer arrays in GAr in DP

• Temperature in gas phase (b/n liquid surface and CRP) is important to monitor in

DP as it effects LEM gain calibration — Static T-gradient profilers in LAr can be used for this

• Also, as in PD-DP

, the region above the CRP (about 40 cm) will be instrumented to understand the behavior of mechanical structure — 20 arrays with 8 sensors/array (with increasing pitch)

• Unlike LAr, the temperature variation

in GAr is rapid w.r.t. height so 0.1K relative precision is sufficient

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ProtoDUNE-DP

Thermometry Validation @ ProtoDUNE

• For FD-SP, Static and Dynamic T-Gradient profilers are being validated at

PD-DP

• From Filippo, 03/07/19, talk
• n PD-DP instrumentation
• For FD-DP, there are no

T-Gradient profilers deployed in LAr in PD-DP, so needs to be validated in post-LS2 PD-DP-II run

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Charge Questions: Thermometers

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Detailed talk by A. Cervera and J. Maricic

• n various types of Thermometers

Cameras

Two types of cameras

• Cold cameras (fixed)
• permanently deployed in the cryostat
• primary usage during filling
• Inspection/warm cameras (movable)
• replaceable over the lifetime of the experiment
• Main purposes: Monitor HV systems, inspect

detector components

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ProtoDUNE-SP

• PD-SP:
• 11 cameras deployed
• 3 designs (2 cold, 1 warm)
• PD-DP
• 11 cold cameras will be tested in the

current run

• Design closely follows the vacuum tight

PD-SP camera design from Bo ProtoDUNE-DP

Cameras@ProtoDUNE

• All ProtoDUNE cameras gave useful views
• Performance criteria being established
• Keeping good focus is a performance issue
• For warm cameras, longevity is another important

aspect, depends on replaceability, will need R&D

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Acrylic Vacuum tight

PD-SP inspection (warm) camera in acrylic tube before installation

Cameras@FD

• Current plan: 3 warm and 12 cold cameras
• Exact locations/ports yet to be finalized
• Longevity is an important feature for the FD for warm cameras

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One key specification Full Coverage with 12 cold cameras in the FD

(8 in corners 4 in long edge centers)

Charge Questions: Cameras

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Detailed talk by G. Horton-Smith in the dedicated Cameras talk in the afternoon

Pressure Meters

• Measuring pressure in GAr is important for DP as it effects gas density and

therefore the LEM gain calibration

• Also, the absolute temperature in the liquid varies with the pressure in GAr, so

this provides a better picture of temperature gradients and CFD simulations

• Measurement accuracy: within at least

0.1% needed

• Standard industrial pressure sensors

can be used

• Pressure meters @ ProtoDUNE:
• We will follow the same model as

ProtoDUNE SP/DP: two pressure sensors and a pressure switch are installed in a dedicated flange (see the image on the right)

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ProtoDUNE

Pressure Meters @ FD

• For the FD, the plan is to double the ProtoDUNE system for redundancy — two

flanges with pressure meters on opposite sides of the cryostat

• Pressure meters cost pretty minimal: M&S <$2k per unit (based on ProtoDUNE)
• Requirements from TDR:
• LBNF will also have (comparatively lower precision) absolute/relative

pressure sensors — provides redundancy, independent measurements and cross checks.

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Level Meters

• Main goals:
• Monitor cryostat filling
• Precise level sensing during stable operations
• Provide information for safety interlocks (e.g. HV)
• Alignment of detector elements with liquid

(The level meters are complemented by vertical thermometer arrays and cameras)

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Level Meter Type (Scope) Precision Primary Purpose Comment Differential Level Meters (LBNF) 14 mm During LAr filling PD-SP/DP use the same design which will be used in the FD Capacitive Level Meters (CISC) < 5 mm Finer tuning of LAr; safety interlocking; cross-check with LBNF level meters High-Precision Capacitive Level Meters (CRP) < 1 mm For sub-mm control of LAr surface Level meters attached to the inner membrane of the cryostat High-Precision Capacitive Level Meters (CRP) < 1 mm For controlling CRP alignment with liquid

Level Meters — overview

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Level Meter Type (Scope) Precision Primary Purpose Comment Differential Level Meters (LBNF) 14 mm During LAr filling PD-SP/DP use the same design which will be used in the FD Capacitive Level Meters (CISC) < 5 mm Finer tuning of LAr; safety interlocking; cross-check with LBNF level meters High-Precision Capacitive Level Meters (CRP) < 1 mm For sub-mm control of LAr surface Level meters attached to the inner membrane of the cryostat High-Precision Capacitive Level Meters (CRP) < 1 mm For controlling CRP alignment with liquid

• PD-SP and PD-DP use different designs
• PD-SP: 1m long, commercially bought meters
• PD-DP: 4m long, custom-built by CERN
• For the FD-SP and FD-DP,
• we will use the PD-DP design as baseline
• The PD-DP-I run will validate the system

Level meters cost is very minimal: M&S <$1500/unit

(based on PD-DP)

CISC Sub-system summary

(from ProtoDUNE to DUNE)

Sub-system

Quantity (ProtoDUNE-SP) Quantity (ProtoDUNE-DP)

Quantity (FD-SP) Quantity (FD-DP) Baseline design Purity Monitors 3 (cryostat) 0 (inline) 2 (cryostat) 0 (inline) 6 (cryostat) 2 (inline) 6 (cryostat) 2 (inline) PD-SP Static Profilers 2 6 6 PD-SP Dynamic Profilers 1 2 (ideal) 1 (minimal) 2 (ideal) 1 (minimal) PD-SP Individual Sensors 38 Ask Filippo? 175 (max.) 127 (min.) 148 (max.) ?? (min.) PD-SP GAr Temp. Arrays Ask Filippo? 20 arrays (8 sensors/ array) PD-DP Capacitive Level Meters 1 (1m long; commercial) 1 (4 m long; custom built) 2 2 PD-DP Pressure Meters 3 3 6 6 PD-SP & PD-DP Cold Cameras 8 (2 designs) 11 (1 design) 12 12 PD-SP & PD-DP Warm Cameras 3 (1 design) 3 3 PD-SP & PD-DP

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Summary: ProtoDUNE Validation

Sub-system PD-SP-I PD-DP-I PD-SP-II PD-DP-II Purity Monitors

✔ ✔ * ✔

Static Profilers

✔ ✔ * ✔

Dynamic Profilers

✔ ✔ * ✔

GAr Temp. arrays

✔ ✔

Level Meters

✔ ✔

Pressure Meters

✔ ✔

Gas analyzers

✔ ✔

Cameras

✔ ✔ ✔ * ✔ *

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* = improved designs

Backup

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Purity Monitors (backup)

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Purity Monitors (backup)

Purity Monitor Requirements

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Add table from TDR and highlight top-level requirements

Static T-gradient Monitor Design @ FD-SP

(From Anselmo) 38

Faraday cage for high fields in DP

Conceptual design stage — under development

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Example shown: Static T-gradient Thermometer system

Dynamic T-gradient Monitor Design @ FD-SP

(From Jelena) 40

Thermometer distribution @ FD-SP (alternative configuration)

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Thermometry Requirements

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Add table from TDR and highlight top-level requirements

CISC Interfaces

Only showing SP here. For DP , we have CRP and DP-PDS in addition to what is listed here

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CISC Risks

(only listing Medium-level risks post-mitigation)

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Key CISC Milestones (SP)

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Key CISC Milestones (DP)

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Costing Summary

• Add a summary cost table (per unit and total for FD-SP) in

case of questions

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