Chopper Parameters

MARI Choppers

MARI uses range of Fermi choppers with the following parameters:

 Length of slits: 100mm
 Slats: Boron fibre reinforced resin
 Slits: Hollow aluminium frame

Other parameters:

Chopper	Curvature Radius (mm)	Slit width (mm)	Slat width (mm)
Chopper A (500mEv):	1300	0.76	0.55
Chopper B (200mEv):	820	1.14	0.55
Chopper С (100mEv):	580	1.52	0.55
Chopper В (50mEv):	410	1.52	0.55
Chopper S (Sloppy):	1300	2.28	0.55

MERLIN Choppers

These have following parameters:

Chopper	Curvature Radius (mm)	Slit width (mm)	Absorber Thickness (mm)	Total Package Thickness (mm)
Fermi:	1300	2.30	0.55	98.
Gd:	Inf	0.2	0.02	10.