NSRL User Guide

There are 3-degrader systems on the NSRL beamline. They are paradoxically named: Small, Large, and 60x60 for maximum confusion.

Size

• Small is sized for the 20x20 cm2 beam spot.
• Large is sized for the 20x20 cm2 beam spot.
• 60x60 is sized for the 60x60 cm2 beam spot.

Location

• Small is the farthest upstream, approximately 35 cm downstream of the vacuum window.
• Large is in the middle of the Target Room
• 60x60 is just in front of the 1024 pixel ion chamber

Material/Density

• Small is polyethylene, density 0.93 g/cm3
• Large is High density polyethylene (HDPE) = 0.97 g/cm3
• 60x60 is regular poly, density = 0.93 g/cm3

Min/Max thickness

• Small goes in steps of 0.1mm up to 12.7mm (or 51.1mm with manual assistance)
• Large goes in steps of 0.25mm up to 255.75mm (or 464.06mm with manual assistance)
• 60x60 goes in steps of 0.1mm up to 102.3mm.

Uses

• Small is used predominantly for electronics testing, especially for high-Z ions from Fe up to Bi.
• Large is used predominantly for radiobiology, especially for ions lighter than Fe.
• 60x60 is used for GCRSim ions.