A professional who prepares ampoule containing charge (specified amounts of materials for crystal growing process) to grow gallium arsenide crystal ingot in crystal growing furnace. Respnsibilities include:

• Cleans ampoules, plugs, and boats, using etch tanks and sandblasting equipment.
• Operates saw to cut remelt into sections of specified size.
• Immerses remelt into etch tank to remove contaminants, and dries remelt in oven.
• Measures and weighs specified amounts of crystal growing material, such as seed, seed powder, remelt, and dopant, and loads material into boat and ampoule, following prescribed procedure.
• Attaches ampoule to diffusion pump to remove air from ampoule, and seals ampoule, using blowtorch.
• Transports sealed ampoule to holding rack in furnace room for further processing by crystal grower.
• Records production information.