Market Model for Expected Return

I understand the Idea behind the Market Model is explaining the expected return for an asset using the Market Return.
Market Model
My First Question is "is the alpha here in the model, which is the intercept, is the same as Jensen’s Alpha?"
My Second Question is "is the error term here refer to the return from unsystematic Risk (which should be zero according to Capital Market Theory) ?"

Thanks in advance

I hope I didn’t annoy you by this random tag but I know you will be able to clear some stuff for me.