Be sure to RTFM (eventually we will incorporate it all in this tutorial)

General Algorithm

1. RTFM

2. Bake extension nipple (if applicable) w/heater tape

3. Fire cell on BOS (with outgassing cap, if applicable -- RTFM)

4. Turn off cooling water, let warm, vent

5. Load crucible

6. Fire cell and crucible on BOS

7. Turn off cooling water, let warm, vent

8. Pull cell in glove bag, transfer to MBE glovebag in transit case, load source material and cell onto MBE

9. Junk growth

10. Grow cool stuff

Echo Sources

Bravo Sources

Pre crucible loading

Note: Ramp slowly to avoid thermal shock (typically <1 Amp/min ~ 60C/min), but don't let the chamber pressure go above 1E-7 Torr (at temperatures above ~1000C you will have no choice, as the PBN will begin decomposing and outgassing). Ramp up slower if need be. After a while most of the junk on the cell will sublimate, at which point the chamber pressure will plummet. All ramping should be done manually by controlling the output percentage (and "current limit" knob), rather than using PID. This is so that you do not take the chamber pressure too high.

1. RTFM to determine (1) max filament currents, (2) ramp rate (temp/min and Amp/min), and (3) max cell temperature.

   1. ALWAYS trust the manual over memory.

1. Ramp up base to max temperature (and current).

2. While slowly raising tip current, lower the base current so as to keep the base temperature at the maximum. Since we want to max out the tip current in order to fully outgas the filament, once the tip temperature hits the maximum continue lowering the base current and raising the tip current so as to keep the tip temperature at the maximum (the base temperature will begin to fall below the maximum). Don't lower the base current below ~2 A, as we don't want anything to redeposit in the base.

3. Ramp down (no faster than the max ramp rate - this is particularly important now that the crucible is loaded) the tip current, followed by the base current.

Post crucible loading

Note: The same rules apply to pre crucible loading, but now we need to be even more careful not to damage the crucible. Since PBN starts to rapidly decompose above 1350 C, this is usually a good max temperature for crucible outgassing.

1. RTFM to determine (1) max filament currents, (2) ramp rate (temp/min and Amp/min), and (3) max cell temperature.

ALWAYS trust the manual over memory.

1. Ramp up base to max temperature (and current).

2. While slowly raising tip current, lower the base current so as to keep the base temperature at the maximum. Once the tip temperature hits the maximum, hold until the chamber pressure begins to roll over.

3. Ramp down (no faster than the max ramp rate - this is particularly important now that the crucible is loaded) the tip current, followed by the base current.

Echo High Temperature La Cell

1. Load on BOS with water cooling nipple (with water feed-throughs in correct orientation)

2. To bake out the nipple:

   1. Unhook any cooling water, and blow out (with N2 or CDA) any remaining water from inside the nipple

   2. Heat up base filament (to keep stuff coming off of the nipple from redepositing on the cell). You can ramp this up at the same time as the nipple. Keep an eye on the chamber pressure - keep it below 1E-7 Torr.

   3. Heat up the nipple using heater tape. Max temperature should be ~200C.

   4. Ramp down both (nipple should be lower temp than cell) to room temperature

3. Connect cooling water to nipple

4. Outgas the cell