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 � 2
Physics Connections (from Glenn; format modified) � 3
CISC Scope (Single-Phase) LBNF scope Pressure Meters (GAr; LBNF) • 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) � 4
CISC Organization S. Gollapinni, A. Cervera G. Horton-Smith C. Palomares J. Maricic, J. Bian C. Lane M. Dolinski, A. Hahn, A. Habig (D. Montanari for LBNF) S. Gollapinni A. Habig, J. Haigh H. Liao, C. Mariani P. Fernandez G. Horton-Smith, F. Blaszczyk � 5
CISC Organization Spain (2), UK (2) and USA (15) � 6
CISC Organization CFD Simulations • 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 Spain (2), UK (2) and USA (15) • In communication with Erik Voirin for confirmations/verifications on simulations � 7
CISC Scope (SP Vs DP) Pressure Meters Pressure (GAr; LBNF) Meters (GAr; LBNF) SP DP Note: DP not as advanced as SP — final configuration and some design aspects need more work � 8
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. � 9
TDR Status TDR draft SP DP 1st draft 30-Nov-18 5-April-19 • TDR progress on track, meeting all deadlines! 2nd draft 11-Jan-19 1-May-19 • Both SP and DP drafts LBNC-1 25-Jan-19 3-May-19 currently under LBNC review, submitted on LBNC-review-1 28-Feb-19 N/A May 3 3rd draft 15-April-19 N/A • Costing and interface documents going Collaboration through final review 3-May-19 3-May-19 Internal review LBNC-2 3-May-19 TBD LBNC-review-2 TBD TBD 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 � 10
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 11
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 Includes statistical errors (see backup) ProtoDUNE-SP ProtoDUNE-SP 12
Purity Monitors @ FD • 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. Use opposite set of human access ports PrM PrM 13
Charge Questions: Purity Monitors Detailed talk by Jianming Bian in the dedicated Purity Monitors talk in the afternoon 14
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 15
Purpose of various Thermometers (Slide from A. Cervera) 16
Thermometry @ ProtoDUNE-SP ProtoDUNE-SP Detector (From Anselmo) � 17
Validation @ ProtoDUNE-SP Static T-gradient system Several calibration methods being deployed (laboratory Vs pump on/off) 2-3 mK relative precision achieved Update with most up-to- date plots from ACV Comparison to CFD has reasonable agreement, more work ongoing to better understand boundary conditions e.g. pressure, heat load etc. � 18
Baseline Thermometer distribution @ FD-SP To-do: update with the less-busy version from Anselmo Maximum sensor configuration, probably not all needed (see alternative configuration in backup) (From Anselmo) � 19
Baseline Thermometer distribution: FD-SP Vs FD-DP FD-SP To-do: for the top one, update with the less-busy version from Anselmo FD-DP Distribution yet to be finalized, expect might need fewer thermometers in the end *Dynamic T-gradient thermometers not shown in DP — yet to be understood � 20
Thermometer arrays in GAr in DP • Temperature in gas phase (b/n liquid surface and CRP) is important to monitor in DP as it e ff ects 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 ProtoDUNE-DP 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 su ffi cient � 21
Thermometry Validation @ ProtoDUNE • From Filippo, 03/07/19, talk on 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 • For FD-SP, Static and Dynamic T-Gradient profilers are being validated at PD-DP � 22
Charge Questions: Thermometers Detailed talk by A. Cervera and J. Maricic on various types of Thermometers 23
Cameras ProtoDUNE-SP 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 • 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 � 24
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 PD-SP inspection (warm) camera in acrylic tube before installation Vacuum tight Acrylic � 25
Recommend
More recommend
