Procedure to establish vacuum

The beam line valve should remain close to isolate the beam line vacuum to the HKS system when the later parts are not in vacuum. To establish the vacuum,

1. Beam line valve should remain close (controlled by MCC).
2. The target ladder should remain retrieved inside the driver and vacuum isolation valve closed.
3. Start pumping vacuum for the three parts in the HKS system until the vacuum level reaches about $2\times10^{-5}.$
4. Slowly or in small steps open the target ladder vacuum isolation valve until vacuum recovers to $2\times10^{-5}$ while the valve fully opened.
5. Finally, call MCC to open the beam line valve. With a higher pumping speed from beam line, the entire system may reach $10^{-5}$ or better quickly.