ProtoDUNE-SP CPA and Field Cage 03/05/2017 Temperature sensors on ground plane A. Cervera, A. Izmaylov, M. Sorel, P . Novella, P . Bernabeu, J.V. Civera, P . Leon IFIC - (CSIC & Univ. Valencia)
2 Motivation I • Contribute to the 3D temperature map to validate fluid dynamic (FD) simulations and ensure a good understanding of the cryogenics system • GPs are located at ~7 m height, in a very interesting region, which can be crucial to validate the FD models LAr surface ground planes courtesy of E. Voirin
3 Motivation II • T-gradient monitors cover two fix XY positions only (red dots ) • Complement them with other sensors of the same precision to provide a 3D map as precise as posible • Particularly interesting are the regions near the LAr inlets (bottom) and the region close to the LAr surface (top) • Sensors in the cathode region could be also interesting since this is not covered at all by T-gradient monitors TOP VIEW c • Locations investigated: o cryostat wall r n e r • APA frames: no space (wires everywhere) APA frames • FC end-walls: need shielding (an overkill) FC end-walls FC end-walls • cryostat walls: not possible to weld anything beam cathode • cryostat corners : OK, they are reinforced • ground planes : OK, no field beyond them • cryogenic pipes : OK, beyond ground planes APA frames
4 Sensor map G T-Gradient monitors T M Cryostat wall Top-bottom SIDE view TOP view M G G G M M T M M T T T T M M M M T T M M M M G T T T T M M T M T T T M M
5 TOP sensors and cabling • Same map as at the bottom • All sensors at the same height T T • Need to understand system to hold the cables • This might be an option T T 14.3 • QUESTION : can this (or T T T T similar) be screwed on the GP ?
6 Sensor’s support • To minimise the temperature bias produced by ground planes keep sensors at some distance from them (~10 cm) • QUESTION : Can this (or similar) be screwed on the GP ? sensor screw T T 25.7 cm 10 cm screw ground plane
7 Hawaii sensor’s support • This is what Hawaii is planning for its T-gradient monitor • Basically a PCB with some holes. That would be easier to machine
8 TOP ground plane cabling T T 14.3 T T
9 cables • In order to maximize the precision of the temperature measurements and at the same time to guarantee good behaviour in cold and low outgassing the following requirements have been identified: • 4 wires per sensor • Teflon jacketed (PFA, FEP , PTFE) cables • Twisted pair wires • EMC shielding every two pairs 2.3 mm
10 Installation in clean room • Nov 7, 2017 - Jan 5, 2018 • For each CPA module, sensors/cables in the 2 associated top GP modules are installed in the clean room • The cable exceeding the GP dimensions is attached to the modules beside, once they are put together (in the cryostat, see T next slide)
11 Moving GP into cryostat • Nov 7, 2017 - Jan 5, 2018 • The three CPA modules and corresponding FCs T and GPs are put together once in the T cryostat T • So cables in each GP module should T be attached to nearby GP modules at that point
12 Rotating FC/GP • Jan 5, 2018 - Jan 10, 2018 • Cables should be T loose between GP modules to allow T rotation of one with respect to the other • They will be tighten T once the three modules are in their T final positions
13 Other • Readout system, calibration system and cables are the same as for the T-gradient monitor • QC/QA : All sensors will be calibrated with their final cables at IFIC. During the calibration process all kind of tests will be carried out to check the accuracy and the reproducibility of the measurements. If possible sensors will be calibrated at CERN with the final readout • Slow controls : Same as for T-gradient monitor • Development towards DUNE : • Sensors’ map and cabling is different for DUNE, but some lessons can be probably learned • Better sensors and cables could be probably found by the time DUNE is built • The readout and calibrations system can be also improved
14 Questions 1. can this (or similar) be screwed on the GP ? 2. can this (or similar) be screwed on the GP ? 3. What is the GP thickness ?
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16 Cryostat ports Hawaii T-gradient monitor other T- sensors purity monitors beam other T- sensors Valencia T-gradient monitor LAr FC 9.1 to be shared Spare signal ports (250 mm) Spare cryogenic ports (250/152 mm) Unused Laser ports (160 mm) Spare (150 mm)
17 Installation schedule • For each top GP module in the clean room, sensors and cables are Nov 7-Jan 5 top GP sensors installed (8 sensors in total) • CPA/FC/GP modules are move sequentially into the cryostat. As they arrive there we route the cable to modules beside • south GPs are rotated and cables between GP modules are tighten Jan 5-20 and routed towards port 14.3 • north GPs are rotated and cables between GP modules are tighten and routed towards port 14.3
18 Schedule 2017 2018 Apr May Jun Jul Aug Set Oct Nov Dec Jan Feb Mar Apr May Conceptual design x Engineering design x Prototyping x x Design calibration x system Calibration system x commissioning Sensor calibration x Cable preparation and x sensor-cable calibration Installation of bottom x x sensors Installation of membrane x x sensors Installation of top x x sensors Deployment of GPs x x
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