ProtoDUNE-DP (NP02) status Filippo Resnati (CERN) on behalf of the NP02 collaboration DUNE Collaboration Call - 28 th of June 2019
ProtoDUNE-DP Single 6x6x6 m 3 liquid argon active volume. Electrons drift upwards, they are extracted into the vapour phase where they are multiplied by the LEMs and readout with the anodes. Main components of the detector: - Membrane technology cryostat - Cryogenics - Photon detection system - Very High Voltage system - Charge Readout Planes (CRPs) - Large Electron Multipliers (LEMs) - Cold electronics and DAQ - Instrumentation - Slow control and other infrastructures Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 2
Last Collaboration Call On the 8 th of March 2019 TPC was mostly completed Closure of the TCO was the major installation work to be completed Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 3
Last Collaboration Call Additional ~ two weeks of delay were announced mid of April. Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 4
Completion of the VHV system End of March / beginning of April Installation of the VHV extender, connection to the field cage and installation of the feedthrough Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 5
TCO closure Preparatory work started on the 8 th of April: - Dirty room - Scaffold for access - Ventilation - Material storage - Confined space trainings - Fire brigade training - Removal of the TCO I-beam Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 6
TCO closure Closure of the warm structure of the TCO on the 6 th and 7 th of May Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 7
TCO closure On the 22 nd of May, insulation and the corrugated membrane were completed Helium leak tests and global vacuum test successfully accomplished Dismounting of the dirty room and cleaning of the TCO wall Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 8
Instrumentation From the 27 th of June till the 13 th of July installation cabling and testing of: - 3x Purity monitors - 11x cryogenic LED lights - 11x cryogenic cameras - 4x level meters - and various temperature sensors https://www.youtube.com/watch?v=eHNSXwgfPQg Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 9
Camera images np02-slow-control.web.cern.ch Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 10
Ground Grid and PMTs Wavelength-shifter on 30 PMTs was changed from evaporated TPB to PEN sheets. 6 PMTs were left with TPB. The operation took place in situ. Installation of the ground grid followed (11 th and 12 th of June). Ground grid composed of 4 3x3 m 2 pieces above the PMTs and a frema along the periphery (last thing to be installed) Intense cleaning campaign of the accessible components of the detector and the walls and roof of the cryostat from the end of May till the closure of the man hole Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 11
Last day with cryostat open 13 th of June: Removal of the last parts of the false floor, cleaning, removal of the scaffold, and finalisation of the ground grid. Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 12
Last day with cryostat open 13 th of June: Removal of the last parts of the false floor, cleaning, removal of the scaffold, and finalisation of the ground grid. Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 13
Cryostat commissioning Formal CERN approval to start the cryogenic operation after passing a series of tests: - Helium leak tests of all the penetrations, flanges, and feedthroughs. - Helium leak check of the TCO weldings (the rest of the weldings were tested at the completion of the cryostat). - Vacuum test of the TCO secondary barrier (the rest of the secondary barrier tested during the cryostat construction) - Global vacuum test of the insulation space - 200 mbar overpressure test monitored with position and strain gauges (comparison with the deformation model ongoing) - Determination of the natural frequency of the cryostat with a vibrational measurement (seismic, not needed for approval) Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 14
Cryostat commissioning Pressure test on the night of the 13 th of June 200 mbarg 100 mbarg 0 mbarg Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 15
Cryogenic operation From the 14 th of June the cryostat is being purged with pure and warm gas argon. In few days the O 2 content was brought down to 2 ppm with the argon piston effect. Since then the argon is purified (oxygen and water) in closed loop. Water content is at the level of 350 ppm (expected to be larger than NP04). Installation of cryogenic moisture traps that are functional since today. If the water contamination is too large there is the risk of ice formation on cold surfaces while cooling down Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 16
In the mean time Installation: - Completion of the slow control cabling on the NP02 roof. - Installation o the motorisation system of the CRPs. - Installation of the PMT light calibration system. - Installation of the PMT power and readout racks. - Installation of 4 warm flanges on the SGFT and final connection of the electronics. - Cabling of the LEM HV. Tests: - Alignment and motion tests of the CRPs. - External noise reduction campaign. - Ongoing tests in gas of the PMTs. - Tests of the LEM HV and HV connectivity. - Cathode HV test. Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 17
HV test In air moisture was driving the current drawn 10 uA 0 uA 0.5 uA -15 kV -10 kV -5 kV 0kV off 0 uA Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 18
Next steps Cooling with sprayers starting from Monday 1 st of July (if water content diminishes). First 3 trucks (3x 20 ton) expected on the 3 rd , 4 th and 5 th of July. From the 8 th of July 2x 20 ton/day during week days for abut 5 weeks. If no regeneration of the purification cartridge is needed during filling, cryostat will be full at the beginning of August. From NP04 experience: cryogenic instrumentation will be fundamental during filling. Filippo Resnati - DUNE Collaboration Call - 28 th of June 2019 � 19
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