Vacuum Chambers - ?

Vacuum chamber

• Clean + assembly

• Why do you need ultrahigh vacuum

• Collisional broadening

• Surface charge affecting measurements

• Ion pump -> why we need it how it works? Roughing pumps etc.

• bake-out

• Conflat vs. KF, copper seals vs. viton

Goals

Deliverables

Ion-Pumps

Our goal is to create an ultra-high vacuum. This means we need to achieve roughly $10^{-7}$ torr.

With the vacuum chamber prepared, we now need to create the actual vacuum.

Concept Check: Why do we need a vacuum for our experiment? We need to avoid atmospheric collisions as that will heat up our atomic vapor. In the end we need to cool and trap our atoms.

In this experiment, we will be using an ion-pump. It can be used continuously to create and maintain an ultra-high vacuum. The ion-pumps have a low power usage. They also have long lifetimes and low noise which are perfect for our experiment.

How does an Ion-Pump work?

p.

Pre-Lab questions and Concept Checks