------17.2.17 ------------------------------------------------------
closing chamber
use Leak testing pump
16.50 p = 0.6 mbar --> starting Turbo pump
18.25 Turbo @ 30kRPM, 33W
Pressure 7.0E-04mbar, backing pressure (leak tester) 0.1mbar
------18.2.17 ------------------------------------------------------
12.30 Turbo @ 42kRPM, 25W
Pressure 6.0E-05mbar, backing pressure (leak tester) 0.1mbar
FL601 started , temperature 25.8 deg C, set point -5.0 deg C
16.10 Turbo @ 42kRPM, 18W
Pressure 1.8E-05mbar, backing pressure (leak tester) 9.3E-2mbar
FL601 set point -5.0 deg C, actual -1.6 deg C
19.2.17
12.20 Turbo @ 42kRPM, 15W
Pressure 1.5E-05mbar, backing pressure (leak tester) 9.3E-2mbar
FL601 set point -5.0 deg C, actual -2.0 deg C
------20.2.17 -------------------------------------------------------
14.30 Turbo @ 42kRPM, 14W
Pressure 1.2E-05mbar, backing pressure (leak tester) 9.2E-2mbar
FL601 set point -5.0 deg C, actual -2.3 deg C
21.2.17
10.10 Turbo @ 42kRPM, 14W
Pressure 1.1E-05mbar, backing pressure (leak tester) 9.2E-2mbar
FL601 set point -5.0 deg C, actual -2.5 deg C
16.30 Turbo @ 42kRPM, 13W
Pressure 1.0E-05mbar, backing pressure (leak tester) 9.2E-2mbar
FL601 set point -5.0 deg C, actual -2.4 deg C
-----22.2.17 -------------------------------------------------------
11.00 Turbo @ 42kRPM, 13W
Pressure 1.0E-05mbar, backing pressure (leak tester) 9.2E-2mbar
FL601 set point -5.0 deg C, actual -2.4 deg C
11.02 +/-15V preamp power ON
11.06 Pressure 1.2E-05mbar, FL601 actual temp -1.8 deg C
11.12 Pressure 1.3E-05mbar, FL601 actual temp -1.4 deg C
14.01 Pressure 1.5E-05mbar, FL601 actual temp -1.0 deg C
14.02 +/-15V preamp power OFF
14.15 Pressure 1.1E-05mbar, FL601 actual temp -1.9 deg C
15.27 Pressure 1.0E-05mbar, FL601 actual temp -2.0 deg C
------23.2.17 -----------------------------------------------------
14.40 Pressure 8.6E-06mbar, FL601 actual temp -2.4 deg C
17.10 Pressure 8.1E-06mbar, FL601 actual temp -2.5 deg C
------24.2.17 -----------------------------------------------------
13.08 Turbo @ 42kRPM, 13W
Pressure 7.0E-06mbar, backing pressure (leak tester) 9.1E-2mbar, leak rate 3.3E-10 mbar.l/s
FL601 set point -5.0 deg C, actual -2.2 deg C
14.30 Pressure 6.8E-06mbar, FL601 actual temp -2.5 deg C
+/-15V preamp power ON
14.49 Pressure 9.9E-06mbar, FL601 actual temp -1.0 deg C
17.44 Pressure 1.1E-05mbar, FL601 actual temp -1.0 deg C
19.00 Pressure 1.1E-05mbar, FL601 actual temp -1.0 deg C
+/-15V preamp power OFF
------26.2.17 ---------------------------------------------------
11.44 Turbo @ 42kRPM, 13W
Pressure 7.5E-06mbar, backing pressure (leak tester) 9.1E-2mbar, leak rate 1.8E-10 mbar.l/s
FL601 set point -5.0 deg C, actual -2.0 deg C
+/-15V preamp power ON
14.02 Pressure 1.2E-05mbar, FL601 actual temp -0.9 deg C
18.19 +/-15V preamp power OFF
Pressure 1.2E-05mbar, FL601 actual temp -0.9 deg C
------27.2.17 ---------------------------------------------------
11.44 Turbo @ 42kRPM, 13W, 0.7A, 33 degree
Pressure 6.8E-06mbar, backing pressure (leak tester) 9.1E-2mbar, leak rate 1.3E-10 mbar.l/s
FL601 set point -5.0 deg C, actual -2.4 deg C
13.15 pressure 6.7E-06mbar;
Turn off Turbo pump and open chamber!
##################################################################
##################################################################
------2.3.17------------------------------------------------------
using leak testing pump as backing/pre pump (start it with open valve --otherwise there will be alarm signal of leak
rate changing dramatically)
showing some time scales for pumping (p_back is the pressure measured in backing pump and p_TC2 is the second gauge
plugged and measured inside the chamber
16.03 p_back = 39mbar; p_TC2 = 1.0E+03mbar
16.29 p_back = 1.3mbar; p_TC2 = 8.4E+02mbar
16.45 p_back = 0.8mbar; p_TC2 = 6.7E+02mbar
16.59 p_back = 0.6mbar; p_TC2 = 4.1E+02mbar
18.26 p_back = 0.2mbar; p_TC2 = 4.0E+00mbar
--> starting Turbopump (accelerating up with safety check step in between)
18.30 p_back = 0.3mbar; p_TC2 = 3.5E+00mbar
(release more gas from the chamber into pipe by TP)
18.34 Turbo @ I=1.8A, P=28W, 7 kRPM, 27 deg C
p_TC2 = 1.9E+00mbar
18.38 Turbo @ I=6.0A, upto P=90W, 10 kRPM, 29 deg C
18.42 Turbo @ I=2.5A, P=38W, 11 kRPM, 29 deg C
p_TC2 = 5.5E-01mbar
18.55 Turbo @ I=1.1A, P=17W, 15 kRPM, 31 deg C
p_TC2 = 4.1E-02mbar
18.59 Turbo @ I=4.5A, P=82W, 19 kRPM, 31 deg C
p_TC2 = 2.3E-02mbar
------3.3.17-------------------------------------------------------
11.05 Turbo @ 42kRPM, 13W
Pressure 5.5E-05mbar, FL601 ON
FL601 set point -5.0 deg C, actual +24 deg C
+/-15V preamp power ON
14.15 Turbo @ 42kRPM, 0.7A, 14W, 33 deg C
Pressure 1.2E-05mbar, backing pressure (leak tester) 9.2E-2mbar, leak rate between 2E-12 and 1.4E-11 mbar.l/s
FL601 set point -5.0 deg C, actual -1.4 deg C
14.30 Adding insulation to water pipe and try to deflect hot air from chiller away from cold pipes
14.40 - 15.40: +/-15V preamp power ON
15.00 Turbo @ 42kRPM, 0.8A, 16W, 33 deg C
Pressure 1.8E-05mbar
FL601 set point -5.0 deg C, actual -0.7 deg C
15.40 Turbo @ 42kRPM, 0.8A, 17W, 33 deg C
Pressure 2.1E-05mbar
FL601 set point -5.0 deg C, actual -0.6 deg C
16.10 Turbo @ 42kRPM, 0.7A, 14W, 33 deg C
Pressure 1.2E-05mbar
FL601 set point -5.0 deg C, actual -1.6 deg C
17.30 Turbo @ 42kRPM, 0.7A, 14W, 33 deg C
Pressure 1.1E-05mbar
FL601 set point -5.0 deg C, actual -1.7 deg C
------06.03.17 ----------------------------------------------
power fluctuations turned off the chiller
13.42 Turbo @ 42kRPM, 1.0A, 19W, 33 deg C
Pressure 2.2E-05mbar
FL601 off.
Turn on FL601, which went from -5.0 up to actual +0.1 deg C and started cooling again.
visible impact on the pressure:
13.46 Turbo @ 42kRPM, 1.0A, 18W, 33 deg C
Pressure 1.1E-05mbar
FL601 set point -5.0 deg C, actual -0.1 deg C
14.04 Turbo @ 42kRPM, 0.7A, 14W, 33 deg C
Pressure 8.7E-06mbar
FL601 set point -5.0 deg C, actual -1.6 deg C
14.26 Turbo @ 42kRPM, 0.7A, 13W, 33 deg C
Pressure 8.2E-06mbar
FL601 set point -5.0 deg C, actual -2.0 deg C
Adding alcohol and water to cooling reservoir up to limit (full reservior), temperature went up due to room
temperature of added liquids
14.44 temp -0.6 deg C
14.49 temp -2.7 deg C
14.52 temp -3.6 deg C
added more alcohol! (one small bottle and a bit of the rest in IPA bottle)
15.00 temp -3.8 deg C
15.01 Turbo @ 42kRPM, 0.7A, 13W, 33 deg C
Pressure 7.9E-06mbar
FL601 set point -5.0 deg C, actual -4.1 deg C
15.12 Turbo @ 42kRPM, 0.7A, 13W, 33 deg C
Pressure 7.4E-06mbar
FL601 set point -5.0 deg C, actual -5.3 deg C
15.14 set point to -10.0 deg C
15.22 Turbo @ 42kRPM, 0.7A, 13W, 33 deg C
Pressure 7.3E-06mbar
FL601 set point -10.0 deg C, actual -6.3 deg C
16.03 Turbo @ 42kRPM, 0.6A, 12W, 33 deg C
Pressure 6.9E-06mbar, p_back = 9.1E-02mbar, leak rate 6.2E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -9.9 deg C
17.00 Turbo @ 42kRPM, 0.6A, 12W, 33 deg C
Pressure 6.7E-06mbar
FL601 set point -15.0 deg C, actual -10.3 deg C
17.38 Turbo @ 42kRPM, 0.6A, 12W, 33 deg C
Pressure 6.7E-06mbar, p_back = 9.1E-02mbar
FL601 set point -15.0 deg C, actual -10.2 deg C
--> reach minimum temp due to not enough alcohol --> set point to -10.0 deg C
17.41 Turn +/-15V preamp power ON
17.46 Turbo @ 42kRPM, 0.6A, 12W, 32 deg C
Pressure 7.2E-06mbar, p_back = 9.1E-02mbar, leak rate 8.3E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -8.6 deg C
18.17 Turbo @ 42kRPM, 0.7A, 14W, 32 deg C
Pressure 1.0E-05mbar, p_back = 9.2E-02mbar, leak rate 2.3E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -8.0 deg C
18.44 Turbo @ 42kRPM, 0.8A, 15W, 33 deg C
Pressure 1.1E-05mbar, p_back = 9.2E-02mbar, leak rate 2.4E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.7 deg C
18.45 Turn +/-15V preamp power OFF
19.35 Turbo @ 42kRPM, 0.6A, 12W, 33 deg C
Pressure 7.1E-06mbar, p_back = 9.1E-02mbar, leak rate 1.7E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -9.8 deg C
------07.03.17 ----------------------------------------------
12.13 Turbo @ 42kRPM, 0.7A, 12W, 32 deg C
Pressure 6.5E-06mbar, p_back = 9.1E-02mbar, leak rate 1.2E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.0 deg C
12.15 Turn +/-15V preamp power ON
12.31 Turbo @ 42kRPM, 0.7A, 14W, 32 deg C
Pressure 8.6E-06mbar, p_back = 9.1E-02mbar, leak rate 1.3E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -8.6 deg C
13.22 Turbo @ 42kRPM, 0.8A, 15W, 32 deg C
Pressure 1.0E-05mbar, p_back = 9.2E-02mbar, leak rate 1.8E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -6.8 deg C
13.41 Turbo @ 42kRPM, 0.8A, 15W, 32 deg C
Pressure 1.0E-05mbar, p_back = 9.2E-02mbar, leak rate 1.9E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -6.9 deg C
14.35 Turbo @ 42kRPM, 0.8A, 15W, 33 deg C
Pressure 1.0E-05mbar, p_back = 9.2E-02mbar, leak rate 1.7E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.3 deg C
15.24 Turbo @ 42kRPM, 0.8A, 14W, 33 deg C
Pressure 1.0E-05mbar, p_back = 9.2E-02mbar, leak rate 1.8E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.3 deg C
16.05 Turbo @ 42kRPM, 0.8A, 14W, 33 deg C
Pressure 1.0E-05mbar, p_back = 9.2E-02mbar, leak rate 1.8E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.4 deg C
17.56 Turbo @ 42kRPM, 0.8A, 14W, 33 deg C
Pressure 1.0E-05mbar, p_back = 9.2E-02mbar, leak rate 1.7E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.6 deg C
18.14 Turn +/-15V preamp power OFF
18.18 Turbo @ 42kRPM, 0.7A, 14W, 33 deg C
Pressure 9.1E-06mbar, p_back = 9.2E-02mbar, leak rate 1.6E-10 mbar *l/s
(decreased after a big outgasing (E-09) just shortly after turning preamp power)
FL601 set point -10.0 deg C, actual -7.5 deg C
------08.03.17 --------------------------------------------------------------
12.00 Turbo @ 42kRPM, 1.0A, 18W, 34 deg C
Pressure 6.2E-06mbar, p_back = 9.1E-02mbar, leak rate 7.9E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -9.7 deg C
Power on Turbo pump higher than usual, although pressure is at its lowest since.
Checked cycle time = 8261 min = 137.68 hours = 5.74 days
pump life = 31107 h
Release a bit of coolant to check the concentration in chemistry lab:
density of mixture = 0.965 g/cm3 at temperature of 19.3 degree
concentration of alcohol: x = (density_mixture - density_water)/(density_ethanol - density_water)
= (0.965 - 0.998)/(0.79 - 0.998)
= 0.159
around 16% alcohol --> freezing temp should be around -7 to -8 degree C
13.46 Turbo @ 42kRPM, 1.0A, 18W, 35 deg C
Pressure 6.1E-06mbar, p_back = 9.1E-02mbar, leak rate 8.6E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -9.2 deg C
15.30 Turbo @ 42kRPM, 0.8A, 15W, 35 deg C
Pressure 6.1E-06mbar, p_back = 9.1E-02mbar, leak rate 9.3E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -9.6 deg C
15.37 Turn +/-15V preamp power ON
16.38 Turbo @ 42kRPM, 0.8A, 17W, 35 deg C
Pressure 9.4E-06mbar, p_back = 9.1E-02mbar, leak rate 1.5E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.0 deg C
16.39 Turn +/-15V preamp power OFF
------09.03.17 --------------------------------------------------------------
11.21 Turbo @ 42kRPM, 0.7A, 15W, 35 deg C
Pressure 6.1E-06mbar, p_back = 9.1E-02mbar, leak rate 8.6E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -9.6 deg C (fluctuations between -10.0 and -9.3 degree C)
11.22 Turn +/-15V preamp power ON
14.18 Turbo @ 42kRPM, 0.8A, 17W, 35 deg C
Pressure 9.3E-06mbar, p_back = 9.1E-02mbar, leak rate 1.7E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.4 deg C
14.39 Turbo @ 42kRPM, 0.9A, 17W, 35 deg C
Pressure 9.4E-06mbar, p_back = 9.1E-02mbar, leak rate 1.6E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.4 deg C
14.40 Turn +/-15V preamp power OFF
14.50 Turbo @ 42kRPM, 0.8A, 16W, 35 deg C
Pressure 7.4E-06mbar, p_back = 9.1E-02mbar, leak rate 1.2E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -8.3 deg C
15.00 Turbo @ 42kRPM, 0.8A, 16W, 35 deg C
Pressure 6.9E-06mbar, p_back = 9.1E-02mbar, leak rate 1.3E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -9.2 deg C
17.14 Turbo @ 42kRPM, 0.8A, 15W, 35 deg C
Pressure 6.1E-06mbar, p_back = 9.1E-02mbar, leak rate 9.9E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -10.0 deg C
17.58 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 6.0E-06mbar, p_back = 9.1E-02mbar, leak rate 4.2E-10 mbar *l/s (did some Helium leak checking)
FL601 set point -10.0 deg C, actual -9.9 deg C
------10.03.17 --------------------------------------------------------------
10.55 Turbo @ 42kRPM, 0.8A, 15W, 35 deg C
Pressure 6.0E-06mbar, p_back = 9.1E-02mbar, leak rate 1.0E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.2 deg C
12.01 Turbo @ 42kRPM, 0.7A, 15W, 35 deg C
Pressure 5.9E-06mbar, p_back = 9.1E-02mbar, leak rate 1.1E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.0 deg C
12.07 leak rate dropped to 3.0E-12 just occasionly
13.07 Turbo @ 42kRPM, 0.7A, 15W, 34 deg C
Pressure 5.8E-06mbar, p_back = 9.1E-02mbar, leak rate 3.5E-10 mbar *l/s (after leak check - suspious about UP
and DOWN ribbon cable flanges)
FL601 set point -10.0 deg C, actual -10.1 deg C
13.07 Turn +/-15V preamp power ON
14.56 Turbo @ 42kRPM, 0.8A, 17W, 34 deg C
Pressure 9.0E-06mbar, p_back = 9.1E-02mbar, leak rate 6.3E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.2 deg C
14.56 Turn +/-15V preamp power OFF
17.10 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 5.9E-06mbar, p_back = 9.1E-02mbar, leak rate 2.9E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.1 deg C
17.40 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 5.7E-06mbar, p_back = 9.1E-02mbar, leak rate 7.4.9E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.2 deg C
------13/03/17 ---------------------------------------------------------------
11.40 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 6.3E-06mbar, p_back = 9.1E-02mbar, leak rate 9.4E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -10.1 deg C
--> pressure went up over the weekend??????????????? (Room temperature can be the reason)
15.53 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 6.1E-06mbar, p_back = 9.1E-02mbar, leak rate 1.5E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.1 deg C
------14/03/17 ---------------------------------------------------------------
09.38 Turbo @ 42kRPM, 0.7A, 15W, 35 deg C
Pressure 6.3E-06mbar, p_back = 9.1E-02mbar, leak rate 1.1E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -9.9 deg C
09.39 Turn +/-15V preamp power ON
11.14 Turbo @ 42kRPM, 0.8A, 17W, 35 deg C
Pressure 8.9E-06mbar, p_back = 9.1E-02mbar, leak rate 1.8E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -7.1 deg C
11.30 Turbo @ 42kRPM, 0.8A, 17W, 35 deg C
Pressure 8.7E-06mbar, p_back = 9.1E-02mbar, leak rate 1.8E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -6.8 deg C
11.30 Turn +/-15V preamp power OFF
Adding same silicone vacuum leak sealant (Aerosol) to the Upstream cable connections (suspious leak)
13.30 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 6.2E-06mbar, p_back = 9.1E-02mbar, leak rate 1.0E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -9.8 deg C
------15/03/17 ---------------------------------------------------------------
10.50 Turbo @ 42kRPM, 0.7A, 15W, 35 deg C
Pressure 6.2E-06mbar, p_back = 9.1E-02mbar, leak rate 1.2E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.0 deg C
Fluke Thermometer(thermocoupling to preamp board) = 0.3 deg C
13.30 Turbo @ 42kRPM, 0.8A, 15W, 35 deg C
Pressure 5.9E-06mbar, p_back = 9.1E-02mbar, leak rate 9.9E-11 mbar *l/s
FL601 set point -10.0 deg C, actual -10.1 deg C
13.48 Leak test of lower 2/3 of BNC connections, when leak risen slowly from 2E-10 to 3E-09 in like 10minutes.
At same time p(TC1) raised for some second up to 9E-06mbar, which could indicate a huge outgasing)
14.04 Turbo @ 42kRPM, 0.7A, 15W, 35 deg C
Pressure 6.0E-06mbar, p_back = 9.1E-02mbar, leak rate 3.4E-09 mbar *l/s
FL601 set point -10.0 deg C, actual -9.7 deg C
16.36 Turbo @ 42kRPM, 0.7A, 15W, 34 deg C
Pressure 5.9E-06mbar, p_back = 9.1E-02mbar, leak rate 5.9E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -9.9 deg C
------16/03/17 ---------------------------------------------------------------
11.49 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 6.1E-06mbar, p_back = 9.1E-02mbar, leak rate 1.8E-10 mbar *l/s
FL601 set point -10.0 deg C, actual -10.1 deg C
13.11 Turbo @ 42kRPM, 0.8A, 15W, 34 deg C
Pressure 6.0E-06mbar, p_back = 9.1E-02mbar, leak rate 1.4E-08 mbar *l/s (leak test Toby - found bad o-ring
connection back side downstream end)
FL601 set point -10.0 deg C, actual -9.7 deg C
----- Switched off TP 15.34 (peter changed Fan of TP controller, new Targetholder did not fit perfectly, so still with
old one, investigation on o-ring leak --> maybe small dust particle)
15.53 chamber close, Roughing pump with bigger pipe ON, 16.02 Turn on TP (Soft start)
16.30 Pressure 1.1E-03mbar (Turbo @ 15kRPM, 0.6A, 10W, 34 deg C)
16.55 Pressure 5.2E-04mbar (Turbo @ 27kRPM, 0.6A, 17W, 35 deg C)
17.32 Pressure 2.8E-04mbar (Turbo @ 42kRPM, 0.6A, 27W, 37 deg C)
18.21 Pressure 2.2E-04mbar (Turbo @ 42kRPM, 0.6A, 20W, 38 deg C)
18.23 pressure = 2.E-04 --> start FL601set point -10.0 deg C, actual -6.5 went up to - 1.5 deg C (start equilibrium)
18.27 Pressure 1.6E-04mbar (Turbo @ 42kRPM, 0.9A, 19W, 38 deg C)
FL601 set point -10.0 deg C, actual -2.2 deg C
18.40 Pressure 1.3E-04mbar (Turbo @ 42kRPM, 0.9A, 19W, 39 deg C)
FL601 set point -10.0 deg C, actual -5.5 deg C
(temperature of TP could have indicated a leak...)
------17/03/17 Friday---------------------------------------------------------------
09.37 Pressure 1.2E-04mbar (Turbo @ 42kRPM, 0.9A, 15W, 40 deg C)
FL601 set point -10.0 deg C, actual -9.6 deg C
LEAK? (screws on targetholder were not secured enough)
09.43 Pressure 5.4E-05mbar (Turbo @ 42kRPM, 0.6A, 13W, 40 deg C)
FL601 set point -10.0 deg C, actual -9.6 deg C
10.40 Pressure 5.5E-05mbar (Turbo @ 42kRPM, 0.7A, 13W, 40 deg C)
FL601 set point -10.0 deg C, actual -9.7 deg C
Helium test: o-ring (downstream end) front top part 10^-9 to 10^-5 (big leak --> no pressure improvement)
11.06 Turn off FL601
14.35 Turn off TP
###################################################################################
OPEN CHAMBER: Removed pre amp board U1-U4.
over weekend close chamber with roughing pump (~5.0E-01mbar)
------20/03/17 Monday---------------------------------------------------------------
CHANGED/SWITCHED UP and DOWN board inside the chamber.
New UP (1-8) and new DOWN (5-8)
Distance measurements:
------17/03/17 Friday---------------------------------------------------------------
09.37 Pressure 1.2E-04mbar (Turbo @ 42kRPM, 0.9A, 15W, 40 deg C)
FL601 set point -10.0 deg C, actual -9.6 deg C
LEAK? (screws on targetholder were not secured enough)
09.43 Pressure 5.4E-05mbar (Turbo @ 42kRPM, 0.6A, 13W, 40 deg C)
FL601 set point -10.0 deg C, actual -9.6 deg C
10.40 Pressure 5.5E-05mbar (Turbo @ 42kRPM, 0.7A, 13W, 40 deg C)
FL601 set point -10.0 deg C, actual -9.7 deg C
Helium test: o-ring (downstream end) front top part 10^-9 to 10^-5 (big leak --> no pressure improvement)
11.06 Turn off FL601
14.35 Turn off TP
###################################################################################
OPEN CHAMBER: Removed pre amp board U1-U4.
over weekend close chamber with roughing pump (~5.0E-01mbar)
------20/03/17 Monday---------------------------------------------------------------
CHANGED/SWITCHED UP and DOWN board inside the chamber.
New UP (1-8) and new DOWN (5-8)
Distance measurements:
New UPstream: (metal frame stand off = 10mm)
Position (to end of chamber): 738 - 40 (pos from target) - 32 (plastic standoff) + 10 = 676 (to end of board)
Orientation:
4
3
6 2
5 1
7
8
New DOWNstream: (metal frame stand off = 20mm)
Position (to end of chamber): 738 - 400 (pos from target) - 14 (plastic standoff) + 20 = 344 (to end of board)
Orientation:
6
5
7
8
***note: 24/03/17: took short standoff for UPstream hold (only ~40mm to targetholder)
remeasured short standoffs: 12.5mm
Checked: Cooling (changed circle with one preamp board less), cabling (preamp power signal),
position, cleaning, test preamp
CABLING changed 16-x19 to D5-8
14.30 close chamber, start roughing pump
15.24 p(TC2) = 4.4E-01 mbar --> soft start big Turbo Pump
15.39 p = 1.6 E-03mbar (0.7A, 11W, 11kRPM, 27 deg C)
16.11 p = 5.9 E-04mbar (0.6A, 14W, 23kRPM, 29 deg C)
16.33 p = 3.4 E-04mbar (1.3A, 38W, 34kRPM, 31 deg C)
17.41 p = 1.7 E-04mbar (0.9A, 18W, 42kRPM, 35 deg C)
Turn on FL601 cooling, set point to -5.0 deg C, actual temp starts at 22 deg C
19.12 Pressure 5.9E-05mbar (Turbo @ 42kRPM, 0.6A, 10W, 35 deg C)
FL601 set point -5.0 deg C, actual -4.6 deg C
--> changed set point to -10.0 deg C
------21/03/17 Tuesday---------------------------------------------------------------
10.52 p = 1.9 E-05 mbar
--> switch on small Turbo pump (TP2)
11.05 Pressure 1.3E-05mbar (Turbo @ 42kRPM, 0.5A, 10W, 35 deg C; TP2 @ 75kRPM, 0.25A, 13W, 32 deg C)
FL601 set point -10.0 deg C, actual -5.5 deg C
--> Turn ±15V preamp power ON
Testing DAQ
11.45 Pressure 2.0E-05mbar (Turbo @ 42kRPM, 0.5A, 10W, 35 deg C; TP2 @ 75kRPM, 0.26A, 13W, 39 deg C)
FL601 set point -10.0 deg C, actual -3.9 deg C
12.17 Turn ±15V preamp power OFF
Pressure 1.9E-05mbar (Turbo @ 42kRPM, 0.5A, 10W, 35 deg C; TP2 @ 75kRPM, 0.26A, 13W, 43 deg C)
FL601 set point -10.0 deg C, actual -4.0 deg C
14.18 Pressure 1.2E-05mbar (Turbo @ 42kRPM, 0.5A, 10W, 35 deg C; TP2 @ 75kRPM, 0.25A, 13W, 45 deg C)
FL601 set point -10.0 deg C, actual -5.6 deg C
added some alcohol(mixing takes a short heat up), switch to helium leak tester (DONT MOVE WHILE IT IS ON)
added FAN for small Turbopump
15.40 Pressure 1.1E-05mbar (Turbo @ 42kRPM, 0.5A, 9W, 35 deg C; TP2 @ 75kRPM, 0.24A, 12W, 33 deg C)
FL601 set point -10.0 deg C, actual -6.0 deg C
17.05 Pressure 1.0E-05mbar (Turbo @ 42kRPM, 0.5A, 9W, 34 deg C; TP2 @ 75kRPM, 0.24A, 12W, 34 deg C)
FL601 set point -10.0 deg C, actual -7.6 deg C
17.05 Turn ±15V preamp power ON
18.51 Pressure 1.6E-05mbar (Turbo @ 42kRPM, 0.5A, 9W, 34 deg C; TP2 @ 75kRPM, 0.24A, 12W, 34 deg C)
FL601 set point -10.0 deg C, actual -5.3 deg C
18.51 Turn ±15V preamp power OFF
------22/03/17 Wednesday---------------------------------------------------------------
10.55 Pressure 7.9E-06mbar (Turbo @ 42kRPM, 0.5A, 8W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 33 deg C)
p_back = 9.2E-02mbar, leak rate 10E-11 - 10E-12 mbar*l/s
FL601 set point -10.0 deg C, actual -7.7 deg C
14.05 pressure 7.7E-06mbar
OPEN CHAMBER FOR ALIGNMENT
------23/03/17 Thursday---------------------------------------------------------------
Si-Detectors: measures- DeltaE-E (65µm - 1000µm) and Downstream E (74µm)
HANDLE WITH CARE, NO TENSION --> THIN LAYERS.
Voltage supply: 24V for 74µm. BIAS cable is 4th row and 2nd place
Cabled to U1-4. DONT FLAT THE CHAMBER WITH LOTS OF AIR, use valve at TP.
------24/03/17 Friday---------------------------------------------------------------
Testing Preamps (with Si-"capacitor" - no BIAS) under atmosphere with 5 deg C cooling
Normal resolution with pulser and without Si-Detector = 2-3 channel
Without BIAS:
#1 adc 0-13: FWHM ~10ch
#1 adc 14,15: Broken
#1 adc 16-31: FWHM ~7ch
#2 adc 0-6: FWHM ~27ch
#2 adc 7,8: FWHM ~5-6ch only
#2 adc 9-14: FWHM ~30ch (2peaks each; low peak coming from wrong pulser signal.)
#2 adc 13: FWHM ~90ch
#2 adc 15: FWHM ~27ch
#2 adc 16-31: 8-10ch
except from #2 adc 22,28: ~27ch
Quad BIAS Supply:
0V - 0.20µA
5V - 0.82µA
10V - 0.95µA
15V - 1.07µA
20V - 1.17µA
24V - 1.25µA
With BIAS:
#1 adc 0-31(14,15 broken): FWHM 4-6ch
#2 adc 0-15: FWHM ~ 7ch
except from #2 adc 3,4,7,8,12 with lower tail: FWHM ~7-10ch
#2 adc 16-31: FWHM ~4-6ch
except 22,38: FWHM ~10ch
except 13: FWHM ~25ch
Targetholder (alignment) marker on scale
pos-1: 34.54 (bottom on ladder)
pos-2: 94.05 (middle)
pos-3: bottom.8 (almost maximum, top on ladder)
New run with alpha source P32 R9344 mixed (only Gold sealing --> wear Cloves)
(Pu-239, - 5.155MeV
Am-241, - 5.486MeV
Cm-244, - 5.805MeV)
17.15 Close Chamber, roughing pump
17.28 p = 9.9E-01mbar --> Start TP (big)
17.48 p = 2.0E-03mbar (TP @ 11kRPM, 0.7A, 12W, 28 deg C
------25/03/17 Saturday---------------------------------------------------------------
15.00 Pressure 4.6E-05mbar (Turbo @ 42kRPM, 0.6A, 11W, 34 deg C)
--> start small TP2 and open valve (quick soft start in 1 minute) - TP2 @ 75kRPM, 0.24A, 12W, 26 deg C)
start FL601 set point -10.0 deg C, actual 20.7 deg C
15.05 p = 3.8E-05 mbar
15.07 p = 3.4E-05 mbar
------27/03/17 Monday---------------------------------------------------------------
12.17 Pressure 6.2E-06mbar (Turbo @ 42kRPM, 0.8A, 14W, 36 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -8.4 deg C
12.21 Turn ±15V preamp power ON
14.05 Pressure 8.7E-06mbar (Turbo @ 42kRPM, 0.8A, 13W, 36 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -5.0 deg C
14.43 Pressure 8.7E-06mbar (Turbo @ 42kRPM, 0.8A, 13W, 36 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -5.1 deg C
14.44 Turn ±15V preamp power OFF
16.25 Pressure 6.1E-06mbar (outgazing still ongoing, saw peak up to 2.3E-05mbar at a glimpse)
(Turbo @ 42kRPM, 0.8A, 13W, 36 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -7.3 deg C
------28/03/17 Tuesday---------------------------------------------------------------
13.06 Pressure 5.7E-06mbar (Turbo @ 42kRPM, 0.8A, 14W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -9.4 deg C
13.09 Turn ±15V preamp power ON
16.15 Pressure 7.8E-06mbar (Turbo @ 42kRPM, 0.8A, 13W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -5.8 deg C
16.16 Turn ±15V preamp power OFF
18.36 Pressure 6.1E-06mbar (Turbo @ 42kRPM, 0.7A, 13W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -8.5 deg C
------29/03/17 Wednesday---------------------------------------------------------------
13.15 Pressure 5.9E-06mbar (Turbo @ 42kRPM, 0.7A, 13W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -9.5 deg C
13.25 Turn ±15V preamp power ON for alpha measurement
14.30 Pressure 7.3E-06mbar (Turbo @ 42kRPM, 0.7A, 13W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -7.6 deg C
15.41 Pressure 7.9E-06mbar (Turbo @ 42kRPM, 0.7A, 13W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -6.6 deg C
16.31 Pressure 7.8E-06mbar (Turbo @ 42kRPM, 0.7A, 13W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -6.4 deg C
good vacuum condition of ~8E-06mbar with preamps on
16.31 Turn ±15V preamp power OFF
17.46 Pressure 6.1E-06mbar (Turbo @ 42kRPM, 0.7A, 12W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -8.7 deg C
------30/03/17 Thursday---------------------------------------------------------------
12.15 Pressure 6.3E-06mbar (Turbo @ 42kRPM, 0.7A, 13W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -9.8 deg C
shut off TP + TP2 --> spinning down
13.05 p = 3.1E-05mbar, turn off FL601, bringing down to atmosphere takes about 30 minutes.
###########################
13.35 OPEN CHAMBER, longer cable done for detector, Peter add block (15.8mm) the target holder (due to pos 3)
put stand off on DOWNstream
Test #3,#4 under atmosphere WITHOUT BIAS:
#3 adc 0 lower xmean ~ 1550, FWHM ~20ch
#19 low xmean ~450, FWHM ~3ch
rest of #3: xmean 2400-2600, FWHM ~10ch
#4 xmean more or less between 2000-3000, most ~2400.
#4 adc 4: double peak, FWHM > 30ch
#4 adc 0 - 15: FWHM ~ 30ch, except of
#4 adc 7: FWHM ~8ch.
#4 adc 16-31: FWHM ~12-13ch, right tail
except #4 adc 16: FWHM ~7ch
#4 adc 18: FWHM 15ch
#4 adc 25: FWHM ~20ch
BIAS up to 24 V 1.38µA leak current (while ramp <3µA)
alpha source inside chamber on new middle position: 94.05 -15.8 = 78.25
chamber close after 2h
WITH BIAS:
#3 0-31: 4-6ch FWHM
except #3 adc 1: ~10ch FWHM
#3 adc 19: ~3ch FWHM (lower mean)
left tail: adc 0-23 and right tail: adc 24-31
#4 adc 0-15: broader: adc 0-4: ~7ch FWHM
adc 5: ~3ch FWHM
adc 6,13: 11ch FWHM
adc 7,15: ~5,6ch FWHM
adc 8-12,14: ~7,8ch FWHM
#4 adc 16-31: 5-8ch FWHM right tail
##############################################
################################closed chamber
16.10 Roughing pump slowly pump down (open value stepwise)
16.25 p = 1.1 mbar --> start TP
16.30 p = 1.3E-01 mbar (TP @ 7kRPM, 1.0A, 15W, 28 deg C)
17.21 p = 7.8E-04 mbar (TP @ 27kRPM, 0.6A, 17W, 31 deg C)
18.08 p = 3.3E-04 mbar (TP @ 42kRPM, 1.1A, 22W, 34 deg C)
--> start TP2 (1min) --> TP2 @ 75kRPM, 0.26A, 13W, 26 deg C)
18.12 p = 2.7E-04 mbar
18.16 start FL601 set to -10.0 deg C, starts at ~ +4.0 deg C
18.18 p = 2.0E-04 mbar
18.54 p = 8.8E-05 mbar (TP @ 42kRPM, 0.8A, 17W, 35 deg C; TP2 @ 75kRPM, 0.25A, 13W, 32 deg C)
FL601 set point -10.0 deg C, actual -5.5 deg C
------31/03/17 Friday---------------------------------------------------------------
10.35 p = 1.5E-05mbar
12.15 p = 1.4E-05 mbar (TP @ 42kRPM, 0.6A, 12W, 35 deg C; TP2 @ 75kRPM, 0.22A, 11W, 32 deg C)
FL601 set point -10.0 deg C, actual -6.2 deg C
12.30 Turn ±15V preamp power ON (for Outgazing and alpha measurement)
13.40 p = 2.2E-05 mbar; leak rate: 1.6E-09 mbar l /S
14.15 p = 2.1E-05 mbar; T = -4.5 deg C
TURN BIAS on 24V, 1.16µA
14.17 DAQ started
#3 -19: low peak 181 with Amplitude of 478 (14.33), FWHM 4-5ch --> Area ~ 5500counts
rest #3 0-31: xmean ~ 1000, FWHM 8-12 ch
#4 adc 6 and 7: no signal
--> adc 6 could be preamp problem
--> adc 7 could be Si-Det issue, because it was observed with #2adc7 before
#4 adc 5: low xmean = 134, FWHM 2.5ch
rest of #4 adc 0-15: (14.40) ~500-800 Amplitude, xmean ~ 1000, FWHM ~12ch
#4 adc 16-31: A~200-250, xmean ~ 950-1050; FWHM ~7-8ch
14.45 p = 2.1E-05 mbar; Temp = -4.8 deg C; leak rate: 8.0E-10 mbar l /S
14.46 Turn ±15V preamp power OFF, switch off Amps and BIAS
16.10 p = 1.3E-05 mbar; T = -6.2 deg C
18.23 p = 1.2E-05 mbar; T = -6.2 deg C
------
------03/04/17 Monday ------------------- Peter testing ----------------
15.49 p = 7.6E-06 mbar;
------04/04/17 Tuesday -------------------
14.05 p = 7.1E-06 mbar;
TP Off
------05/04/17 Wednesday -------------------
########################################
##### chamber open, alpha source out ###
10.25 chamber close, start pumping
12.10 large TP ON
13.55 p = 9.4E-05 mbar
15.30 p = 5.7E-05 mbar
------06/04/17 Thursday -------------------
09.50 p = 1.5E-05 mbar
15.30 p = 1.0E-05 mbar
------07/04/17 Friday -------------------
09.25 p = 9.1E-06 mbar (TP @ 42kRPM, 0.5A, 9W, 35 deg C; no TP2)
FL601 set point -10.0 deg C, actual -9.7 deg C
09.25 Turn ±15V preamp power ON
12.02 p = 1.2E-05 mbar
T = -6.9 deg C
Turn ±15V preamp power OFF
12.13 p = 1.0E-05 mbar
T = -7.5 deg C
12.54 p = 9.0E-06 mbar
T = -8.5 deg C
15.04 p = 9.0E-06 mbar
T = -9.1 deg C
16.47 p = 8.6E-06 mbar
T = -9.3 deg C
##########################
ACCIDENT Registered on Sunday 09/04/17 ~10 am:
Power went down due to wiring problem
Tom C. closed valves, but chamber was probably already vented to atmosphere.
During power shut down roughing and turbo pump slowed down and turbo probably deaccelerate against atmosphere.
Possible back flows.
------11/04/17 Tuesday -----------------
OPEN CHAMBER 16.05: readjust Downstream plate to 326mm, cause we changed to longer stand-off
Downstream --> 74µm Si-Det
Upstream --> 500µm Si-Det
Check DAQ/FWHM of spectra without BIAS on under atmosphere and only PULSER signal:
BIAS up (500µm):
Voltage[V] Leak current[µA]
0 0.14
5 0.6
10 0.73
20 0.93
30 1.11
40 1.22
50 1.27
60 1.32
70 1.34
80 1.38
90 1.42
100 1.44
110 1.48
120 1.49
130 1.52 --> 1.44 (after 5 min)
Check DAQ/FWHM of spectra with BIAS on under atmosphere and only PULSER signal:
CLOSING CHAMBER
18.03 Start roughing pump
18.06 p = 1.0E+03 mbar
18.11 p = 2.0E+01 mbar
18.14 p = 3.8E+00 mbar
18.16 p = 1.9E+00 mbar
18.19 p = 1.1E+00 mbar --> start TP (and close valve at TP2)
18.22 p = 5.0E-01 mbar
18.25 p = 9.0E-02 mbar (took a while for next stage of acceleration... very slow start)
18.34 p = 2.6E-03 mbar
18.40 p = 2.2E-03 mbar
18.44 p = 1.6E-03 mbar
19.02 p = 1.0E-03 mbar
19.12 p = 8.2E-04 mbar
19.18 p = 7.6E-04 mbar
19.21 p = 7.0E-04 mbar
19.30 p = 5.7E-04 mbar
20.00 p = 3.7E-04 mbar (full speed at TP @ 42 kRPM)
20.04 TURN ON TP2
20.06 p = 3.0E-04 mbar
20.10 p = 2.9E-04 mbar (TP @ 42kRPM, 0.9A, 18W, 34 deg C; TP2 @ 75kRPM, 0.28A, 15W, 28 deg C)
------12/04/17 Wednesday -----------------
9.33 p = 6.1E-05 mbar
10.27 p = 5.9E-05 mbar
Turn on FL601 chiller set to -5.0 deg C; T_start = 18.7 deg C
10.44 p = 2.9E-05 mbar; T = 4.8 deg C
stop chiller to remove 500ml of Coolant and replace it with ~375ml IPA
10.54 p = 2.7E-05 mbar; T = 3.4 deg C
11.08 p = 2.1E-05 mbar; T = -5.0 deg C (set to -10.0 deg C)
11.15 Turn ±15V preamp power ON
11.29 p = 2.4E-05 mbar; T = -5.8 deg C
11.50 p = 2.5E-05 mbar; T = -5.1 deg C
BIAS up for UPSTREAM (500µm - 130 V) and DOWNSTREAM (74µm - 24 V)
11.51 DAQ started for testing Si-det with triple alpha source
12.10 p = 2.4E-05 mbar; T = -5.1 deg C
12.17 p = 2.5E-05 mbar; T = -5.2 deg C
13.12 p = 2.3E-05 mbar; T = -5.2 deg C
15.08 p = 2.1E-05 mbar; T = -5.1 deg C
15.50 p = 2.0E-05 mbar; T = -5.1 deg C
15.58 DAQ stopped; ramp down BIAS, switch off amp+preamps
Turn ±15V preamp power OFF
16.02 p = 2.0E-05 mbar; T = -5.2 deg C
16.35 p = 1.5E-05 mbar; T = -6.0 deg C
17.04 p = 1.5E-05 mbar; T = -6.0 deg C
17.05 Turn ±15V preamp power ON
17.19 p = 1.7E-05 mbar; T = -1.4 deg C (set to -2.0)
17.19 Turn ±15V preamp power OFF
17.40 p = 1.5E-05 mbar; T = -5.7 deg C (after set to -10.0 deg C)
18.14 p = 1.4E-05 mbar; T = -5.8 deg C
------13/04/17 Thursday -----------------
11.37 p = 1.0E-05 mbar; T = -6.2 deg C
Turn ±15V preamp power ON
13.21 p = 1.4E-05 mbar; T = -4.5 deg C
Turn ±15V preamp power OFF
add ~300ml IPA, set point to +5.0 deg C
13.44 p = 1.3E-05 mbar; T = 4.1 deg C
14.33 p = 1.4E-05 mbar; T = 5.0 deg C
14.38 FL601 turn OFF, peter test cooling pipes with Helium (~4bar He --> leak rate up to 10^{-6} or 10^{-5} mbar*l/s
Test chiller in close circle: 15.05 T = -8.3 deg C
open cooling pipe --> chamber without cooling:
14.50 p = 2.0E-05 mbar
15.05 p = 2.9E-05 mbar
15.35 p = 4.0E-05 mbar (leak rate 5 * 10^{-5} mbar*l/s)
15.50 reconnect cooling to chamber
15.55 p = 1.5E-05 mbar; T = -5.8 deg C; leak rate 2.0E-05 mbar*l/s
16.55 p = 1.7E-05 mbar; Cooling was off by Daid to test temperature influence
17.00 p = 1.1E-05 mbar; T = -5.7 deg C (chiller back on)
17.50 p = 1.0E-05 mbar; T = -6.6 deg C
18.18 p = 1.0E-05 mbar; T = -6.8 deg C
------14/04/17 Friday -----------------
11.09 p = 8.5E-06 mbar; T = -7.1 deg C
11.15 Turn ±15V preamp power ON
12.10 p = 1.2E-05 mbar; T = -5.2 deg C switch to Helium leak pump: rate ~ 4.3E-09 mbar*l/s
12.29 p = 1.1E-05 mbar; T = -5.2 deg C
Turn ±15V preamp power OFF
14.20 p = 8.5E-06 mbar; T = -7.2 deg C
14.50 Turn ±15V preamp power ON
15.05 p = 9.4E-06 mbar; T = -6.6 deg C; leak rate 5*10^{-09} mbar*l/s
15.30 p = 1.0E-05 mbar; T = -5.7 deg C; leak rate 6.3*10^{-09} mbar*l/s
15.50 p = 1.1E-05 mbar; T = -5.6 deg C; leak rate 7*10^{-09} mbar*l/s
16.33 p = 1.1E-05 mbar; T = -5.5 deg C; leak rate 7.6*10^{-09} mbar*l/s |