[PEPPo] interesting solenoid article

[Jay Benesch]

There are lots of arxiv posts on Halbach arrays with variable field 
strength.  Radiation damage is an issue which is why Ryan has an LDRD 
with many samples in the tunnel with attached dosimeters.

https://scholar.google.com/scholar?hl=en&as_sdt=0%2C47&q=halbach+array&oq=Halbach 
yields 22,800 results.
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