ICARUS HV System Fernanda G Garcia on behalf of ICARUS HV System Working Group 19 September 2018 Outline Overview of HV system for ICARUS Current Status Reference ICARUSTM200101 The High Voltage System for ICARUST600 F ID: 762812
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ICARUS HV System Fernanda G. Garcia, on behalf of ICARUS – HV System Working Group 19 September 2018
OutlineOverview of HV system for ICARUSCurrent StatusReference:ICARUS-TM-2001/01 The High Voltage System for ICARUS-T600, F. Sergiampietri et. al. 09/19/2018 ICARUS - Working Group HV System F.G. Garcia 2
High Voltage System for ICARUS09/19/2018 ICARUS - Working Group HV System F.G. Garcia 3 The ICARUS T600 detector is based on four ionization chambers Nom. electrical field: 1.48m x 0.5kV/cm = 75kV Max. electrical field: 1.48m x 1.0kV/cm = 148kV TM_2001_01 F. Sergiampietri et. al.
High Voltage System for ICARUS09/19/2018 ICARUS - Working Group HV System F.G. Garcia 4 HV power supply: Heinzinger , -100kV, 1mA HV coaxial cable: 2-10 m long cable HV feedthrough Two concentric cylinders (one ground, one HV) separated by an insulator with high dielectric rigidity Cylinder is long enough to feed the HV below LAr level
Current Status 09/19/2018 ICARUS - Working Group HV System F.G. Garcia 5 Preliminary measurements on both T300s Electric contacts of all the high voltage components; Uniformity of the resistance along the drift region; HV Test of Field Cage - applied voltage proportionality Date Activity Aug-20 Resistor inst. West-N(E/W) Aug-21/22 Resistor inst. East-N(E/W) Sep-05 Resistor inst. West-S(E/W) & East-S(E/W) Sep-14 HV Feedthroughs cleaned Sep-17 HV Feedthrough installed on West module East module HV Feedthrough required flange modification Sep-18 Installation of HV FT East module HV Test of Field Cage West & East module Participation & Contribution: C. Montanari, F. Resnatti , L. Bagby , C. James, A. Braggiotti , S. Centro, F. Sergiampietri , F.G. Garcia
Name Convention 09/19/2018 ICARUS - Working Group HV System F.G. Garcia 6 (Module location)–(North/South)(Location within vessel) Ex: Module 1 - cryo side , left drift volume is designated as West - N E S N W E Mod1 Mod2 beam
Field Cage Resistors Installation09/19/2018 ICARUS - Working Group HV System F.G. Garcia 7 gap1 gap1 Total of 30 gap/drift volume (including grounding) Drift length: 1.5 m Total of 4-100-M resistors connected in parallel, one for each drift volume (picture shows two front resistor chain (red)) Expected voltage across resistors: 2.5 kV 1-30 1-30 Electrodes 29 electrodes/drift volume SS tube, out : 34mm pitch: ~50mm Cathode Team: C. Montanari , F. Resnatti , F.G. Garcia
HV Monitor pick-off09/19/2018 ICARUS - Working Group HV System F.G. Garcia 8 Wire on the monitoring resistors located in module east – south end
West Module Measurements – Resistance along drift region09/19/2018 ICARUS - Working Group HV System F.G. Garcia 9 Very good resistance uniformity within ± 0.7% along drift region Average: 24.2 M Findings: East drift region : gap 29 measured ~32 M - resistor was re-installed and nominal resistance measured West drift region: last gap showed a short to ground the HV monitor pick-off had a loose wire – wire was repaired
East Module Measurements – Resistance along drift region09/19/2018 ICARUS - Working Group HV System F.G. Garcia 10 Good resistance uniformity within ± 1.2% along drift region Average: 24.1 M Findings: West/East drift region : last 5 gaps resistance on the initial measurement is lower by ~ 5% However, resistance is increasing over time The expectation is that the resistance will be in the correct range given enough time
HV Test Field CageSee Linda’s presentation next09/19/2018 ICARUS - Working Group HV System F.G. Garcia 11 Team: C. Montanari, L. Bagby , C. James, F.G. Garcia
Next StepsList of activities include but not limited to Perform HV test prior cooling down the cryostatperform test of the HV divider at the final configuration in air at a to be determined safe working position and check for any deviation from uniformity along the chain Generation of the Field Map inside the drift volumes c alculate voltage contours near the field electrodes in normal and breakdown conditions Procedure for HV ON/OFF during operations based on various plausible scenariosverify no short-circuits are present before raising the HV ramp up in steps of XX/min ramp-down in steps of YY/min 09/19/2018 ICARUS - Working Group HV System F.G. Garcia 12
ICARUS HV System Fernanda G. Garcia, on behalf of ICARUS – HV System Working Group 19 September 2018
Organization and Scope (1/2)C. Montanari distributed the provisional ICARUS Working Group early summerSuggestion made by S. Centro to include PMT into the scope of the HV distributionHV Distribution WG participates on TPC and PMT meetings OrganizationCurrent members are A. Braggiotti (Padova) J. Yu (UTA)L. Bagby, F.G. Garcia* (FNAL) 09/20/2018 ICARUS - Working Group HV System F.G. Garcia 14 * Interim convener your experience and skills are essential to this experiment please join us!