I was a charge nurse @ ASH for a while, so I can answer your question. Because ASH is a "State" facility, they don't do "per diem". I'm sure it has to do with the State's budget. The closest they come to that category is a position that requires that you work 1, 2, 3 or 4 shifts per week. I was full-time, so I'm not sure what kind of benefits those part-time positions come with.
I can say that I really enjoyed working there. You need to either apply on-line or go to the campus and fill out an application. They are always in need of good nurses, so you should quickly get a phone call following submission of your application. I originally filled mine out on-line. I frequently heard of nurses filling out an application at the hiring office (on campus) and being told "wait right here". They would be interviewed immediately by a nurse manager or shift supervisor authorized to hire. I was hired originally for the 7-3 shift, which (at most places) you usually have to wait until someone dies to get.
I wish you the best. It was a challenging but not at all difficult job. There were always plenty of staff, and I never felt unsafe. I always got out on time, with the rare exception being if someone fell and split their head open during shift report. Also, it is a 100+ year-old campus, so it's nothing fancy to look at. The insurance benefits and retirement benefits are fantastic.
PM me if you want to know more. Good luck!!