Mar 20 2024

Updates

Fabrication
- Received two more cathode front end 16/30 samples from machine shop. These samples will be polished using sandpaper to remove machining marks from cone prior to barrel polishing.
The following plans was developed with Survey and alignment
- Objective 1: Establish gun chamber Z axis using the anode as US aperture and flange as DS aperture
- Objective 2: Establish spherical electrode Z axis while on a fixture outside the gun chamber
- Objective 3: Compare the two and guide electrode installation assembly to make the two Z axes as coincident as possible, or determine difference between the two to help with gun alignment in tunnel
- Objective 4: Determine difference between laser retro-reflection (with GaAs and with mirror pucks) and electrode Z-axis

Tasks and approximate timeline:

Week of March 18:
- Carlos coordinates with Neil Wilson to move the breadboard top to 80/20 tall table along with the gun vacuum chamber, and position the gun to back (or front?) end of table with anode facing the SS table in the back of the clean room
- Carlos coordinates with Marcy availability of one mirror puck, and one puck with GaAs wafer
- Carlos finds a sufficiently long rod to manipulate pucks inside the gun chamber
Week of March 25:
- S&A executes a dry run of all objectives, but keep in mind the dry run starts with the electrode mounted to the vacuum chamber
Week of April 15:
- S&A executes objectives 1-4 with the rebuilt electrode assembly. The rebuilt electrode will have a new front end piece with shallower cone angle.
Week of May 27:
- S&A assists in the tunnel with gun alignment
Week of June 17:
- S&A assist in the tunnel with laser retro-reflection