Perhaps you should try some spelling variations:
"particle acceleration" » "particle accelerators"
"particles accelerated" » "particles acceleration", "partially accelerated", "lattices accelerated"
"particle accelerator" » "particle accelerators"
"particle accelerated" » "particle accelerators", "partially accelerated", "practice accelerated"
"particle acceleraton" » "particles acceleration", "particle accelerations", "pareticle acceleration"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("particle acceleration") OR ((("particle accelerator") OR ((((("particle accelerated") OR ("particle acceleraton"))) OR ("particles accelerated")))))).
• Removing quotes may allow a broader search: (( particle acceleration ) or ((( particle accelerator ) or ((((( particle accelerated ) or ( particle acceleraton ))) or ( particles accelerated )))))).
• Adding a wildcard symbol may retrieve word variants: (("particle acceleration") or ((("particle accelerator") or ((((("particle accelerated") or ("particle acceleraton"))) or ("particles accelerated"))))))*.