-
Notifications
You must be signed in to change notification settings - Fork 2
Gem Jaws Manager
ChrisColeExpControl edited this page Jul 23, 2019
·
2 revisions
Wiki > The Backend System > Specific Device IOC > Jaws and Slits > Gem Jaws
Gem jaws are a set of 5 jaws which work in concert to limit the beam of neutrons reaching the sample (see the Jaws Manager page). The 5 jaws are ordered 1 nearest the beam and 5 nearest the sample.
The parameters are (use Jaws Manager for reference):
| Letter | Parameter | Value | Notes |
|---|---|---|---|
| c | Collimator position | 0 mm | No collimator so beam tapered from moderator |
| j1 | Jaw 1 position | 6322 mm | Distance from moderator |
| j2 | Jaw 2 position | 8128 mm | Distance from moderator |
| j3 | Jaw 3 position | 10329 mm | Distance from moderator |
| j4 | Jaw 4 position | 12643 mm | Distance from moderator |
| j5 | Jaw 5 position | 15389 mm | Distance from moderator |
| s | Sample position | 17000 mm | Distance from moderator |
| w | Width of moderator | user set | |
| h | Height of moderator | user set | |
| x | Width at sample | user set | |
| y | Height at sample | user set |
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\gem_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.