Remove small mirrors from bell jar. Reload filaments with aluminum, pump down and melt in. Strip and clean primary mirror. Pump down and deposition. Remove primary mirror from bell jar.
Purpose is to remove any contamination from the filaments prior to the melt-in process.
Filaments are installed but not loaded with aluminum. Chamber is closed and evacuated to approximately 2x10 -5 torr. Each knife switch is closed in turn while the current is run through them. Filaments should be allowed to reach white hot and burned for 20 seconds. Connect the ammeter around the correct feeds to the knife switches.