CLIC-PACMAN: BPM-to-Quadrupole Alignment based on EM Field Measurements Manfred Wendt CERN BE-BI-QP.
Pressure drop measurements at CERN
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Pressure drop measurements at CERN
description
Pressure drop measurements at CERN. Introduction. Purpose: measure pressure drops and HTCs for reasonable pipe diameters Compare to models – understand which model works best for our parameters Start with straight pipes, 3.175mm and 2.2mm OD, later include bends Location - PowerPoint PPT Presentation
Transcript of Pressure drop measurements at CERN
Pressure drop measurements at CERN
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Introduction• Purpose:
– measure pressure drops and HTCs for reasonable pipe diameters– Compare to models – understand which model works best for our
parameters– Start with straight pipes, 3.175mm and 2.2mm OD, later include bends
• Location– Building 158: CORA cooling plant (used for tests for CMS upgrade and
ATLAS IBL)• Planning by Richard B, DUTs prepared by Richard F• Local help from Alex Bitadze. This is what Alex and I did from 9/10
to 11/10:– Setup readout box with NTCs and pressure sensor readout– Take temperature calibration points (not clear whether needed with
NTCs)– Connect DUT to CORA– Connect power supply to tube (started with 3.175mm tube)– Test that heating and NTCs work (dry run)– Could not run the plant (no expert available)
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Setup
• Pressure sensors are 1-100 bar relative• Capillary to one pressure sensor too short – for now connected to
spare pressure sensor, should be changed • Additionally: one absolute pressure sensor for atmospheric pressure
85cm+- -
15 15 15 15 15 55
T3 T4 T5 T6 T7 T8T2T1 T9 T10
64 5 4cm
p1p2
p3 (not used)
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Pictures
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Dry run• Set power supply to 5A, measure 0.42V → estimate tube resistance (2 halves
parallel) is 0.84Ω• Power supply did cut out arbitrarily
– Will replace it with one of Alex’s supplies• Still, could see that tube is heating, and the correct temperature sensors increase
12.85
12.9
12.95
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13.05
13.1
13.15
16:26 16:33 16:40 16:48 16:55 17:02 17:09 17:16 17:24
Time
T [d
egC]
T1
T2
T9
T10
12
13
14
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16:26 16:33 16:40 16:48 16:55 17:02 17:09 17:16 17:24
Time
T [d
egC]
T3
T4
T5
T6
T7
T8
12
13
14
15
16
17
T1 T2 T3 T4 T5 T6 T7 T8 T9 T10
aver
age
T [d
egC
]
Average between 16:45 and 16:50
Power cutting out
Modifications on input• We need a capillary to fix boiling point to start of DUT• This should be instrumented with pressure and
temperature sensors before and after to determine state of fluid before (liquid) and after (two-phase vapour quality)
• We might also add a heater after the capillary to be able to shift the input vapour quality• Preferably this would require another pressure sensor before the
heater (to take out pressure drop in heater)
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From plantTliq
pliq pin
To gun case Tliq,pliq
Δhpin p1+
+
+
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Next steps• When available, add interlock box• Get right length capillary for downstream pressure
measurement• Leak checking • Pressurize system and check that relative sensors
work accurately, if not calibrate• Run with CO2, do some measurements
– Need to revise test matrix• Change to 2.2mm OD tube• When available, insert input capillary and heater• Change to DUTs with bends
