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LH2-Target |
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Main
ArCO2 P 10 CF4 H2
Start of LH2-Target
S0
September 2003
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Change to LD2
Status: System filled with N2 or H2
Pumping out of System + Target:
Close MV01, MV05 and MV11 Open MV04, MV03, MV08 and MV09 MV10 is closed, switch "on" RP02 and open MV10 slowly (when 1bar is reached, MV10 can be opened full) Switch "on" PG01 and wait until pressure is ~8-5 x 10-2 mbar (On the PC the target is displayed yellow = liquid, because it's simulation Ptarget<Patmosphere)
Refill of Deuterium (if necessary):
Switch "off" PG10, close MV10 Close MV03, MV04 and MV08 The compressor can be started now Connect the D2 gas cylinder to the H2 inlet, this can be done via the N2-tube, this tube must be then connected to the H2 inlet Open the main-valve at the cylinder, 2. stage of the pressure reducer must be adjusted to ~2.1 bar, open the valve after the pressure reducer Open MV10 and with valve MV11 purge ~10 x via RP02 Close MV10 and MV11 Open MV02 at the D2 storage tank Activate the LN2 trap Open MV11 and open MV08 slowly until pressure in the D2 storage is 2.05 bar (Control with PT01) Close MV11 and MV08 Deactivate the LN2 trap Open MV10 slowly Switch "on" PG01 and wait until there is no more ice on the Cu-spiral of the LN2 trap Close the D2 gas cylinder Control the valves (pumping continues via the opened MV10):
Change the setpoint at the TC330 to 22.00 K: (press successively "2","2","setpoint","0","0","enter") !!setpoint = decimalpoint!! If there is any wrong input: you can leave the setpoint-program with "escape" and try again... When PG01 has reached <8 x 10-2 mbar: close MV10, switch "off" RP02 and PG01 and open MV08
At the PC:
With the mouse click successively on Menu/Target/Liquefaction. After this press the "+" key and the setpoint-window appears Click there on "Deuterium" and wait until the new setpoints are inserted Press "-"-key and the "Target"-window appears There are two alarm-messages: Pstorage (too much pressure) and Ptarget (too less or no pressure)
Then open PV02, the flow increases to ~2400 SCCM and the pressure in the target increases too, it will be stopped automatically at ~1.1 bar, the flow decreases to ~2 SSCM If the pressure in the target is too high, adjust the left potentiometer at the PID to ~2.0 V
The D2 liquefaction lasts ~6 hours
Then adjust the setpoint at the TC330 to 23.70 K and switch the "heater" from "medium" to "high" Close PV02, at the PC change to "Exploitation" Close PV01: the system is operating now like a kryo-pump, the turbomolekular-pump continues operation Two alarm-messages will appear: Pstorage and Ttarget Press the "+"-key: the "setpoint-window" appears Click on PT01S1 and insert in the upper line the new value: 1090 mbar (previously activate NumLock=Verr num) the alarm Pstorage disappears (Pstorage ~1054 mbar) As described above, change T22S2 from 23 K to 22 K, the alarm Ttarget disappears Ready EXPLOITATION
For evaporation of D2: change the setpoint at the TC330 to 60 K
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