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V. Vacek/CTU Prague
Pressure profile (p2 is across the stave)
Pressure profile (p2 is across the stave)
The under pressure/over pressure mode is obtained via the system pump operational
mode (clockwise/anticlockwise rotation: sucking/pushing)
CPPM Al staves (used at RAL)
our exp. set up consists of:
operations in a cold isolated box with He flux
8 Pt100 on "silicon side" (two per stave: input and output)
20 AD590 temperature sensors (5 per stave: two on "silicon
side" and three on the cooling tube side) unused in this run
12 differential gauge pressure sensor (RS) across the staves (three per stave)
1 overall differential gauge pressure across the manifolds
2 (absolute) pressure sensors across the cold box
1 volumetric flow meter (uncertainty ±2%)
2 Pt100 INSIDE the cooling tube (input/output: ice conc.)
8 180 Ohm MINCO heaters (two per stave simulating the nominal 80 W pixel sensor
heating) powered in parallel
some modifications to the frame/manifolds were necessary
to fit the apparatus into the cold box
One and half day of data taking.
VERY STABLE RUNNING CONDITIONS
No power
Overall flow = 68 l/h (18.9 cc/s)
p (manifolds) = -826.6 mbar
Stave
#1
#2
#3
#4
p1 (mbar)
-331.4
-343.5
-330.4
-338.0
p2 (mbar)
-184.3
-192.6
-197.4
-185.7
p3 (mbar)
-218.8
-205.3
-219.4
-213.9
p (mbar)
-734.5
-741.4
-747.2
-737.6
Pinput = -70 mbar Poutput = -980 mbar
p (box) = -910 mbar
Tinput = -17.6 °C Toutput = -17.0 °C
CLOSE STAVE # 3
Flow = 52.8 l/h (expected 51 l/h)
p (manifolds) = -854.5 mbar (+3.4 %)
Stave
#1
#2
#4
p (mbar)
-758.6
-767.9
-761.3
p
+3.3 %
+3.6 %
+3.2 %
CLOSE STAVES # 1 AND #3
Flow = 37.6 l/h (expected 35.2 l/h)
p (manifolds) = -883.5 mbar (+6.9 %)
Stave
#2
#4
p (mbar)
-795.1
-790.3
p
+7.2 %
+7.1 %
POWER ON
ALL 4 STAVES OPEN
40 W on stave # 1 (power supply has 60 V max)
flow = 68 l/h
Stave
#1
p1 (mbar)
-350.7
p2 (mbar)
-177.8
p3 (mbar)
-206.1
p (mbar)
-734.6
It takes horribly long time (~ 1 h) to get stabilised when heated!!