Development Updates for ProtoDUNE Phase II: CRP Modifications and Testing
Updates on the development of Charged Readout Plane (CRP) for ProtoDUNE Phase II driven by lessons from commissioning and operation in ProtoDUNE-DP. Major topics include modifications for CRP mechanical structure, new LEM development, cold box improvements, and testing plans. Detailed steps per system and a timeline for CRP development, testing, and production are outlined, aiming to achieve readiness by early 2022.
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CRP developments for ProtoDUNE phase II Driven by lessons from CRP commissioning/ operation in ProtoDUNE-DP Reviewed during the Workshop on LEM/CRP (April 6-7th, 2020): https://indico.fnal.gov/event/23774/ 3 main topics: Modifications and design changes for the CRP mechanical structure and grid Development for new LEMs / anodes Cold box improvements and new features meeting July 9th 2020 D. Duchesneau / CRP meeting 1 18/06/2020
Development for CRP component tests in 2020 and 2021 Creation of a 1x1m mini CRP, for validation of : New LEM / Anode design Charge collection (resistive combs) Spark guides Instrumentation Thermal LevelMeters Deformationprobes ... To be used in the coldBox test facility at CERN using a special supporting beam to adapt on cryostat roof: Cold box in Bld 182 at CERN Assembly of the structure and availability by 10/2020 Cold box new features foreseen by CERN: Cathode system for drift in LAr Purification system to get gas purity similar to DP conditions Surface perturbation system to generate wavy conditions ProtoDUNE-DP CRP1 and CRP2 in Nov 2019 Cold box test of CRP2 in Dec 2018 LAr level 5mm above Grid 18/06/2020 2 D. Duchesneau / CRP meeting
Main steps per system (to be fine-grained and correlate in time): MiniCRP: Mini-CRPs mechanical test in Cold Box Mini-CRPs design & prod. assembly LEMs: LEM tests at CEA of various configurations 4 Mini CRP 2x2 Cold Box test LEM Design optimisation LEM prod when LEMs validated LEMs /anode prod CRP structure, assembly and tests: CRP Full dummy CRP0 assembly and production + fake LEMs/anodes CRP Full CRP0 Planarity, grid / Cold test 1bis cold test CRP frame and grid sub-Parts manufacturing CRPs & tooling design 1bis prod CRP CRP 2bis cold test 2bis prod Cold Box: roof modification for SGFT + instrumentation Purity system implementation Original cold box system Cathode implementation Cold box tests 18/06/2020 3 D. Duchesneau / CRP meeting
CRP development - tests - production timeline Timeline to update with cold box readiness and LEM status July 2020 August 2021 January 2021 October 2020 April 2021 March 2022 CRPs & tooling design CRP frame and grid sub-Parts manufacturing Full CRP0 Planarity, grid / Cold test Production of dummy CRP Cold test different grid, guard ring, comb structures, fake LEMs/anodes LEMs /anode prod LEMs /anode prod LEM Design for 2x2 + iteration 4 Mini CRP 2x2 tests LEM prod Production final CRPs Cold test Installation in the cryostat CRP 1bis test CRP 1bis prod Mini-CRPs design & prod. CRP 2bis prod CRP 2bis test NP02 Cryostat available ? /2021 18/06/2020 4 D. Duchesneau / CRP meeting
18/06/2020 5 D. Duchesneau / CRP meeting
18/06/2020 6 D. Duchesneau / CRP meeting
Lessons from CRP commissioning/ operation in ProtoDUNE-DP From a critical point of view CRP Planarity is worse than expected at cold (4mm instead of 1.5 mm) => structure had to be revised to be more stiff Liquid argon surface instability complicated the operation: new design should integrate several modifications to be less sensitive => larger gap grid-LEM + additional device to get the LAr level knowledge at each CRP corner Extraction grid and LEM capacitive couplings and stability over time => revise the electrical configuration of both LEM and grid HV distribution Grid sparking (independently of the mechanism) is harmful to the readout electronics => need to be minimized and controlled to eliminate all risks for the electronics Guard rings to catch the potential sparks 0.2-0.4 sparks/h/CRP independent of cathode ON or OFF for V = 3.1 kV sparking rate increases by increasing the HV across the LEMs: 0.4 -0.9 sparks/h/CRP for V = 3.4 kV Existence of microphonic effects due to potential vibration mode => optimise the LEM-anode sandwich system and adapt possible damping Charging up of materials or ions may generate electrostatic effects (grid currents ) => Adapt a system to drain the charge Solutions and modifications for the structure and mechanical part: the CRP upgrade and improvements for phase II of protoDUNE-DP were presented at the April workshop 18/06/2020 7 D. Duchesneau / CRP meeting
