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Goal of this procedure: Enter oven mode and reach desired oven profile

Instructions: To keep track of changes to the procedure - copy this page, date it, and add execution notes in red. Remember to save changes.

Table of Contents:

Table of Contents

                    NOTE - WORK IN PROGRESS!


Link to elog summary:

enter here

Procedure

Update 4/8/2024 for simplified 

Checkout and setup - Perform these steps several hours before opening the oven valves

Procedure

Checkout and setup

20

Procedure Execution notes
1Record goal density and helium buffer pressure


2

Set 10 Torr gauge set points to plus and minus 1 Torr of desired pressure

    • Note: the hysteresis value is where the trip occurs, the lower value is where the fault will clear
 
3Set the 1000 Torr gauge setpoint to 30 Torr
4

If using DPS, confirm it is operating nominally and record the starting IP pressure (VGCC 3259)


4

Confirm helium gas bottle is connected to fill line

1

#1, regulator set to 5-10 psig.

Record gas type, starting bottle pressure, and regulator pressure

 
5If using DPS, confirm it is operating nominally.
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Confirm that the fill line #2 is closed, and that the IOTA controller in rack FKG20-22 is turned off.
6

Zero the 10 and 1000 Torr gauges


7

Fill IP with He to goal IP pressure using:
How to perform a static fill with DPS

Note - the US2/3/4 gauges will trip off shortly after starting the static fill. You will need to restart the gauges (turn cathode HV On), then reset the valve interlocks, reopen the beamline valves, then continue with the static fill. This will happen once every time you pass the threshold of ~1e-3 Torr on US1.



Procedure for oven turn on

3 Rack 20While , Turn valve control for the beryllium window valve to local only and remove key. Note: the EPICS controls for this valve are also password protected so this will be very well configuration controlled.Back at the computer, perform an (Upstream Heater PS1) at approximately 550 W (table and plot in next column)- we probably need 10% higher than UCLA to match the profile so don’t be scared to push it up a bit to 600 W. 
  • Will eventually be Epics controlled, but for now it is manual control
    • Multiply the Voltage with Current to get total power - record March 20222*3.33 = 97 W - 10:15 am, 30 deg C
  • Aborted…
  • 29.2*3.33 = 97 W - 11:15 am, 77 deg C
  • 41.7*4.78 = 199 W - 11:40 am, 134 deg C 
  • 52.2*5.95 = 310 W - 12:40 pm, 350 deg C
    • Note: I saw pressure rise from 4.00 to 4.05 Torr coincident with lithium change of state. Ken says lithium is pushing the helium out.
  • Beamline valves fault crash. Recovered. Needed to bypass 3259 and 3291
  • 60.5*6.8 = 410 W - 1:45 pm, 673 deg C
  • 66.8*7.43 = 496 W - 3:00 pm, 538 deg C
  • 72*7.99 = 575 W - 4:00 pm, 768 deg C

    		• Procedure Execution notes
    1Verify vacuum conditions approximately 1e-6 Torr or better - Record pressure

    2

    Zero the 10 and 1000 Torr gauges

    		 

    Allow gas to flow for a minimum of 30 minutes.

    Stop the flow from the mass flow controller


    2Ensure that gauges US1, US2, US3 and DS1 CC are bypassed.
    3Confirm the 10 and 1000 Torr setpoints are set appropriately for the desired oven pressure
    4Confirm the Beryllium window valve VV3208 is closed - close it if not!
    5

    Set up strip-tool of pressure in the plasma oven:

      • VGCM:LI20:M3201:PMONRAW
      • VGCM:LI20:M3203:PMONRAW
    • Saved as DPS_Pressures.stp

    Set up striptool of oven thermocouples plus the thermocouples on the bypass line, cooling water jackets, base-plate and air.

    • Saved as Li_oven_startup.stp

    6Head out the FKG20 racks
    7Purge fill line by running a small amount of He through the fill valve and then stopping and pumping out the IP - Record final pressure

    Set EPS EXPERT Mode to be “ON” by turning the interlock key in the EPS box in

    FKG20-27 in the gallery.

      • Note: EXPERT mode is “OFF” if the LED light is OFF and EXPERT mode is “ON” if the red light is ON)

    48Unlock oven gate valves (switch to CAMAC mode) : Use the key to switch the valve controller labeled VV3183 VV3187 in rack FKG20-22 to "CAMAC" mode 
    9

    Lock the Be window valve to be inserted: Use the same key to  switch the valve controller labeled VV3208 to "LOCAL ONLY" and remove the key.

    Note: the EPICS controls for this valve is also password protected so this will be very well configuration controlled.


    105

    Open oven gate valves 3183 and 3187. (there might be a small amount of helium between the valves).

    Continue pump down to 1e-6 Torr - Record pressure    		6

    Close angle valve VV3201 isolating the plasma beamline from the plasma turbo

    		7Check Beryllium window valve VV3208 is closed- close if not!8

    Set up strip-tool of pressure in the plasma oven:

      • VGCM:LI20:M3201:PMONRAW
      • VGCM:LI20:M3203:PMONRAW

    If the interlock is faulted then perform a valve interlock reset.


    11Turn on the oven heater power supply. Open the "Genesys Expert..." panel and select "PS On" to ON
    12

    Restart the gas flow from the MFC and fill back to the goal pressure.

    Note - the beamline valve interlock will likely trip again. If it does, restart the gauges and continue as described above.


    13

    When you are at the goal pressure -

    		9Fill IP with He to goal IP pressure. If using DPS then follow: How to perform a static fill with DPS

    Hit EPS Reset to clear the low pressure fault


    14

    Set EPS EXPERT Mode to be “OFF” by turning the interlock key in the EPS box in Rack 20-27 in the gallery. (Note: EXPERT mode is “OFF” if the LED light is OFF and EXPERT mode is “ON” if the red light is ON) . 

    You are now done at the racks

    .


    15Perform another EPS reset (this is needed to enable the heater)
    16

    Set up striptool of oven thermocouples plus the thermocouples on the bypass line, cooling water jackets, base-plate and air.

    • Saved as Li_oven_startup.stp

    Raise heater power

    slowly (~ 100 Watts per hour) while monitoring the oven pressure and temperature until desired operating conditions and are reached

    .

    This can done manually by entering the voltage setpoint on the E300 panel,

    Or - use the automated tool:

    Code Block
    screen -S ovenScreen

python $TOOLS/pydm/display/user-facet/tools/ovenStartUp.py [power]

    where [power] == target power

    To detach the screen:    crtl-a then crtl-d

    To reattach the screen:  screen -d -r ovenScreen


    Progress is logged in ovenStartUp.log

    During the oven heat up:

    • Record
    • I, V, P and time.
    • Monitor temperature of bypass. Do not exceed 100 C on viewports. If 100 C is reached, shut down oven following shut down procedure.
        • (I don’t think this ought to be a concern since it has never gone above 50 degrees and if it does, it may just mean the TC is loose and striking the oven).






    Notes from

    June 2023:

    • 10:44 - 29.

    • 5V, 3.4A = 100 Watts,    TC4 = 29.7C

    • 11:45 - 41.7V, 4.8 A = 200 W,        TC4 = 173C

    • 12:45 - 51.3V, 5.9A = 300W,          TC4 = 360C

    • 13:49 - 59.6V, 6.7A = 400 W,         TC4 = 540C

    • 14:43 - 67V, 7.5A = 500 W,           TC4 = 669C

    • 15:45 - 70.4V, 7.8A = 550 Watts,   TC4 = 780C

    • 18:00 - 72.0V, 8.0 A = 575 Watts - TC4 = 832C

    17

    Fine tune the heater power to reach the desired oven profile. This plot shows the desired heater current vs. pressure:

    Image Added

    • At pressures less than 3 Torr, stay below ~450C on TC 1 and 7.

    Note: Reducing the helium gas pressure in a hot oven could cause loss of lithium! Reduce the heater power to achieve the desired oven temperature then slowly reduce the helium pressure. Slowly raising the buffer gas pressure will not harm the oven.



    Procedure for oven shut down

    9 hours turning down by hand- 11 hours until valves can be closed


    		Procedure Execution notes
    1

    Turn off heater supply slowly to reduce thermal stress to the oven tube and wick.

    Do this either by hand, or using the automated tool (~ 100 Watts per hour) 

    Code Block
    screen -S ovenScreen

python $TOOLS/pydm/display/user-facet/tools/ovenShutdown.py

    To detach the screen:    crtl-a then crtl-d

    To reattach the screen:  screen -d -r ovenScreen

    Previous notes

    • 15:00 - 67V, 500W

    • 16:00 - 60V, ~400W,

    • 17:00 - 51V, ~300W

    • 18:00 - 41V, ~200W

    • 19:00 - 29V, ~100W

    • 20:00 - heater off

    2

    After the heater power is turned down to 0, wait until oven thermocouples indicate the oven is near room temperature (less than 50°C). Lithium is liquid at 180°C. 

    Takes about 11 hours to reduce to 50C

    		 
    3Write down the buffer pressure for the record in the facet elog

    4

    Close oven gate valves 3183 and 3187. Turn the key to “CLOSE VALVE” in the PLC valve controller in rack FKG20-22 and remove the key. This will disable the valves from opening.

    Set the Be window valve 3208 back to CAMAC.

    		 
    5Drain all helium gas and open valves to restore pumping. If using DPS then follow:  How to perform a static fill with DPS
    6Open the Be window valve, remove bypasses, and reset gas types on the gauges to nitrogen.


    Emergency shut down procedure

    If possible the oven should be cooled slowly using the above procedure to reduce thermal stresses on the oven. But in an emergency situation the oven may be put into a safe-mode to prevent loss of lithium using the following procedure. Note that depending on the situation, some of these steps are automatically taken by the EPS.


    		Procedure Execution notes
    1

    Close oven gate valves 3183 and 3187.

    If there is an EPS fault then this happens automatically.


    2

    Turn off the oven heater power.

    If there is an EPS fault then this happens automatically.

    		 
    3Secure the helium gas source – either drain the IP or ensure DPS is operating in the nominal static fill state: How to perform a static fill with DPS

    4

    		Log the details of the fault and shutdown: type of fault, reason if known, IP pressure, oven temp, and any other relevant information. 
    5Turn the key to “CLOSE VALVE” in the PLC valve controller in rack FKG20-22 and remove the key. This will disable the oven gate valves from opening.
    6Do not attempt to restart the oven until you investigate, find, and fix the source of the failure.

    Figures:

    Useful material

    E300 Google Drive folder

    How to perform a static fill with DPS

    TDK-Lamdba GEN100-15 oven heater power supply manual

    Figures:


    Li oven sketch with TC locations

    Image Modified

    Li density profiles

    From: Summary of FACET II lithium oven measurements - June 3, 2021

    More profiles available in doc (3 Torr, 4 Torr, 6 Torr, 8 Torr

    Image Modified

    From Ken 4/8/2024:

    • At pressures less than 3 Torr, stay below ~450C on TC 1 and 7.

    Image AddedImage Added


    Temperatures from heat up (8 Torr)and shut down (from 5 Torr)

    Image Added

    Image Added