CISC, DUNE CM FNAL, 06/06/2019 Temperature sensors (as “draft” for scope review) A. Cervera M.A. Garcia Peris (IFIC-Valencia)
Table of contents # slides # slides Content accum. 1 Motivation of standard temperature measurements 1 5 Motivation of precision temperature measurements, CFD simulations and overall strategy 4 9 Short description of all systems in ProtoDUNE-SP 4 12 Short description of laboratory calibration and results 3 14 Strategy for extrapolation from ProtoDUNE to DUNE 2 Short description of all systems in DUNE-SP with lessons learned from ProtoDUNE-SP . 18 4 Baseline number and location of devices Some details of static precision thermometers (profilers and individual) to demonstrate 23 5 feasibility and cost e ff ectiveness: mechanics, cable routing, etc. 43 Charge questions and answers: Here is where most of the plots will go 20 2 Anselmo Cervera Villanueva, IFIC-Valencia
Draft charge 1.How did the three types of temperature sensors employed in the ProtoDUNE detectors (Static T-gradient thermometer, Dynamic T-gradient thermometer, and individual temperature sensors) perform relative to one another? 2.Were the employed temperature sensors able to provide the data necessary to validate theoretical calculations of fluid flow inside the ProtoDUNE cryostat? 3.Is it important from a physics standpoint to validate theoretical calculations of fluid flow inside the DUNE far detector modules (no longer a design issue) and if so what level of instrumentation will be required to accomplish this? 4.Are all three di ff erent types of temperature monitors employed in the ProtoDUNE-SP cryostat necessary for the DUNE far detector cryostats in that they have unique features necessary for meeting monitoring requirements? 5.Are the temperature monitor strings currently being implemented in the ProtoDUNE-DP cryostat (and hence not yet tested) potentially a simpler and less expensive option to the three types of devices implemented in the ProtoDUNE-SP cryostat? 6.Are the proposed mechanisms for supporting the monitors within the cryostat and connecting them to the outside of cryostat mechanically sound and cost e ff ective? 3 Anselmo Cervera Villanueva, IFIC-Valencia
Question 1 • How did the three types of temperature sensors employed in the ProtoDUNE detectors (Static T-gradient thermometer, Dynamic T- gradient thermometer, and individual temperature sensors) perform relative to one another? • The dynamic T-Gradient monitor has been used to validate the hypothesis of uniform temperature when pumps are o ff , used by all other sensors for the so called pumps-o ff calibration • The dynamic and static profiles can be compared at any time to study the di ff erences between the two locations • The 2D sensor array at bottom at top can be used to connect the measurements between the two profilers and also to understand horizontal e ff ects due to the location of LAr inlets and LAr pump 4 Anselmo Cervera Villanueva, IFIC-Valencia
dynamic dynamic static static 5 Anselmo Cervera Villanueva, IFIC-Valencia
dynamic dynamic static static 5 Anselmo Cervera Villanueva, IFIC-Valencia
dynamic dynamic static static 5 Anselmo Cervera Villanueva, IFIC-Valencia
Question 2 • Were the employed temperature sensors able to provide the data necessary to validate theoretical calculations of fluid flow inside the ProtoDUNE cryostat? • We are still in the process of tuning CFD simulations using data from ProtoDUNE-SP data • We expect to have some systematic studies before the review • Current simulations predict 5-10 mK gradients, which agree with data to first order, but we need to go into the details 6 Anselmo Cervera Villanueva, IFIC-Valencia
Current simulations https://indico.fnal.gov/event/20887/contribution/0/material/slides/0.pdf PUMPS ON PUMPS OFF 7 Anselmo Cervera Villanueva, IFIC-Valencia
Next steps • The plan is to identify the key parameters and make several simulations varying one parameter at the time: current inputs • LAr surface temperature • LAr inlet temperature table not up to date Parameter Input or Output of CFD Version 1 Comments on Version 1 Cryostat height Input 7.878 m Measured with laser (1 cm error approx.) From capacitive level meter: https://np04-slow-control.web.cern.ch/ LAr surface height Input 7.406 m np04-slow-control/app/#!/histogram/NP04_DCS_01_NP04_LT0100 https://np04-slow-control.web.cern.ch/np04-slow-control/app/#!/ ullage pressure Input 1.045 bar histogram/NP04_DCS_01_NP04_4PT4920 LAr surface Computed using https://lar.bnl.gov/properties/basic.html#phase and Input 87.596 K temperature the ullage pressure. Compatible with temperature measured by sensor Heat flux Output 5.76 W/m^2 LAr inlet temperature outlet temp + 0.2 K Estimated by M.Chalifour Input LAr flow rate per pipe Input 0.4170025 kg/s vapor being drawn from 5-7 gr/sec Estimated by M.Chalifour. Output the chimneys 8 Anselmo Cervera Villanueva, IFIC-Valencia
Question 3 • Is it important from a physics standpoint to validate theoretical calculations of fluid flow inside the DUNE far detector modules (no longer a design issue) and if so what level of instrumentation will be required to accomplish this? • Energy calibration depends very much on the local electron lifetime • Give some numbers • Electron lifetime can only be measured in few locations near the cryostat corners by Purity Monitors. This is an instantaneous measurement • Electron lifetime can be computed using cosmic rays, but those are rare 1500 m underground: • Need here some numbers: cosmic muon flux, statistic needed for reasonable understanding and correction, etc 9 Anselmo Cervera Villanueva, IFIC-Valencia
Question 3 • CFD simulations, tuned with temperature data will be used to predict the electron lifetime everywhere in the TPC • In principle the more sensors the better constraint, which implies a lower systematic error in the energy correction • There is obviously saturation here. We are still far from understanding how many sensors we need • To understand the optimal number of sensors and their locations we need to implement the full correction chain: 1. several CFD simulations varying relevant parameters 2. mock temperature data with varying number of sensors to constraint the CFD simulations 3. Estimate the error on the predicted electron lifetime, which will depend on the number of sensors and their location 10 Anselmo Cervera Villanueva, IFIC-Valencia
Question 4 • Are all three di ff erent types of temperature monitors employed in the ProtoDUNE-SP cryostat necessary for the DUNE far detector cryostats in that they have unique features necessary for meeting monitoring requirements? • Dynamic T-gradient monitor : can be calibrated in-situ at any time, ensuring that we have a reliable understanding of the gradient regardless of ageing e ff ects, calibration or electronics problems • Static T-gradient monitor : It has much simpler mechanics. It can be installed in places were space is restricted. In DUNE-SP , where there is no space behind APAs, this is the only viable solution for the vertical gradient measurement. Lab calibration works since T0 • Individual sensors: They complement the vertical measurement with a 2D horizontal map. In ProtoDUNE-SP it has been observed that the horizontal behaviour is far from trivial 11 Anselmo Cervera Villanueva, IFIC-Valencia
Pipes sensors • Plots in the next slides show the di ff erence in temperature between the two pipe edge sensors dynamic static 12 Anselmo Cervera Villanueva, IFIC-Valencia
Pipe 1 (from TCO) 13 Anselmo Cervera Villanueva, IFIC-Valencia
Pipe 2 14 Anselmo Cervera Villanueva, IFIC-Valencia
Pipe 3 15 Anselmo Cervera Villanueva, IFIC-Valencia
Pipe 4 16 Anselmo Cervera Villanueva, IFIC-Valencia
Far from inlets 17 Anselmo Cervera Villanueva, IFIC-Valencia
Pumps-off for all sensors • Second set of 6 sensors (one SUB-D connector) shows larger RMS • First set within 5 mk 3 mK 2 mK 5 mK 5 mK 18 Anselmo Cervera Villanueva, IFIC-Valencia
Pumps-on • Pipes sensors in October 19 Anselmo Cervera Villanueva, IFIC-Valencia
Pumps-on • Pipes sensors in December 20 Anselmo Cervera Villanueva, IFIC-Valencia
Pumps-on • Pipes sensors in Febrero 21 Anselmo Cervera Villanueva, IFIC-Valencia
Pumps-on • Pipes sensors in Abril 22 Anselmo Cervera Villanueva, IFIC-Valencia
Question 5 • Are the temperature monitor strings currently being implemented in the ProtoDUNE-DP cryostat (and hence not yet tested) potentially a simpler and less expensive option to the three types of devices implemented in the ProtoDUNE-SP cryostat? • NO, ProtoDUNE-DP uses one string in one of the corners with standard uncalibrated sensors. In principle this can only be used for level measurements and during cooldown and filling. Those sensors don’t have su ffi cient precision for: • Detecting cryogenic system problems: < 20 mK (in the 35t stratification was observed with 20 mK gradient) • Check the temperature uniformity: in ProtoDUNE-SP <10 mK • Predict the electron lifetime based on CFD simulations • This system can only be installed in the corners 23 Anselmo Cervera Villanueva, IFIC-Valencia
Recommend
More recommend
