NSLS-II Project Seminar

The traditional process of designing and tuning the magnetic lattice

of a particle storage ring lattice to produce certain desired properties

is not straight forward. Often solutions are found through trial

and error and it is not clear that the solutions are close to optimal.

This can be a very unsatisfying process. In this paper we take a step

back and look at the general stability limits of the lattice. We employ

a technique we call GLASS (GLobal scan of All Stable Settings) that

allows us to rapidly scan and find all possible stable modes and

then characterize their associated properties. In this paper

we illustrate how the GLASS technique gives a global and comprehensive

vision of the capabilities of the lattice. In a sense, GLASS functions

as a lattice observatory clearly displaying all possibilities. The power

of the GLASS technique is that it is very fast and comprehensive.

There is no fitting involved. It gives the lattice designer clear

guidance as to where to look for interesting operational points.

We demonstrate the technique by applying it to two existing storage

ring lattices - the triple bend achromat of the ALS and

the double bend achromat of CAMD. We show that using GLASS,

we have uncovered many interesting and in some cases previously

unknown stability regions.