Nimrod Jaws Manager

Wiki > The Backend System > Specific Device IOC > Jaws and Slits > Nimrod Jaws

Nimrod jaws are a set of 6 jaws which work in concert to limit the beam of neutrons reaching the sample (see Jaws Manager). The 6 jaws are ordered 1 nearest the beam and 6 nearest the sample.

The parameters are (with reference to the diagram in Jaws Manager):

Letter	Parameter	Value	Notes
c	Collimator position	0 mm	No collimator so beam tapered from moderator
j1	Jaw 1 position	6458 mm	Distance from moderator
j2	Jaw 2 position	8072 mm	Distance from moderator
j3	Jaw 3 position	12072 mm	Distance from moderator
j4	Jaw 4 position	15450 mm	Distance from moderator
j5	Jaw 5 position	17235 mm	Distance from moderator
j6	Jaw 6 position	19691 mm	Distance from moderator
s	Sample position	19691 mm	Note that the sample is assumed to be at the final jawset
w	Width of moderator	user set
h	Height of moderator	user set
x	Width at sample	user set
y	Height at sample	user set

Setup

The control files for the nimrod jaws are part of the galil motor set up and are per instrument. There is an example in ...\EPICS\support\motorExtensions\master\settings\nimrod_jaws\*.cmd which would need to be copied to C:\Instrument\Settings\config\<instrument host name>\configurations\galil. IOC System tests also exist for the logic.