Loading Arsenic into Crucible

As always... RTFM!!

Located in Share > library > MBE-manuals > Commercial > Veeco - Valved Cracker As_500

Equipment and Notes

Equipment

• Wrench, Box End - 1/4” x 5/16”

• Veeco Dial Torque Wrench and Socket (1/4”, 6 pt.)

• Gasket – 6” Silver

• Gasket plate - buy new from veeco

• Moly bolts for sealing ring x 16 - buy new from veeco

Notes

• Make sure valve is open! (Ensures crucible is vented and pumped down)

• Can reload on the system

Open and Load

• Purge the water lines with N2 over several hours &/or cap to prevent H2O presence.

• Open needle valve if not already open.

• Vent BOS

• Remove the top of the sublimator and put aside (in clean foil)

• Leave 6" gasket on to protect knife edge during crucible opening and loading

Open

As sublimator open as shipped with top removed

Note: New As cell's are shipped without a crucible gasket plate installed

• Remove the sealing ring using a UHV clean torque wrench and place in clean UHV clean foil (save bolts in clean UHV foil boat)

Open

Removing bolts with torque wrench

Note: The bolts will not be re-used except if the cracker has just been sent from Veeco without a gasket plate installed (e.g. brand new or re-built)

• Remove gasket plate (we do not reuse this) with UHV pliers on tabs (This can be thrown away)

Open

Sealing ring

Open

Empty crucible

• P2 removes As bottle(s) from outer wrapping and cuts open last bag

• P1 opens As bottle(s) and carefully pours contents into crucible

Do not get any As anywhere other than in the crucible! Especially in the sublimator but outside the crucible-- don't do that!

Open

Loading As chunks

• P1 hands closed bottle back to P2 who seals it in a bag and puts aside

• Repeat for second bottle until unable to continue filling crucible (~ 650g loaded on Echo 12/11/20)

Open

1 kg, 2 bottles loaded

Close

• P1 carefully wipes inner crucible knife edge (and puts on new clean glove(s), like after any knife edge wiping)

• P2 cuts open gasket plate bag with clean scissors

• P1 uses clean gloves to remove gasket plate and insert into crucible with tabs aligned

Open

Gasket installed

• P2 unwraps sealing ring for P1 to grab

• P1 replaces sealing ring while P2 makes strong UHV foil boat for new moly bolts

Note: Unless we re-use the bolts, which is only if the cracker has just been sent from Veeco without a gasket plate installed (e.g. brand new or re-built)

• P2 opens new moly bolts bag and pours them into strong UHV foil boat. P2 will hold this boat over the open UHV tool container in case it rips.

• P1 inserts all bolts, finger tight

• P1 uses clean socket and veeco dial torque torque wrench to tighten bolts, sequentially 30 in/lbs, 60 in/lbs, 90 in/lbs 3x each

• P1 uses clean gasket pullers to remove 6" gasket from the top of the sublimator and wipes knife edges

• P2 cuts new 6" silver gasket, P1 puts gasket on evaporator knife edge

• P2 unwraps top of sublimator, P1 replaces top of evaporator, P3 closes N2 line

• P1 replaces and tightens bolts

• Prior to pump down, continuity check the cell

• Leave valve open during pump down

• After pump down, continuity check the cell and leak check

• Tags: Arsenic As Load Loading Crucible Sublimator Cell Sealing Plate Ring Torque Wrench