feat(flomni): open frontend slit + drop filters on feye_in/feye_out

feye_in now widens sl1xs/sl1ys by +0.3 mm and sets filter transmission
to 5% before moving the eye in, so there is enough flux/visibility on
the camera. feye_out restores the pre-open slit position (persisted
via a BEC global var so it survives a kernel restart) and fully
removes filters (fil_trans(1)) before checking whether the direct
beam disappeared. If the slit was manually re-adjusted while the eye
was in, feye_out now asks whether to keep the current size instead of
restoring the pre-eye value.

csaxs (for fil_trans) is threaded into Flomni via constructor
injection, gated on the existing "fttrx1 in dev" real-beamline check,
rather than exposing it as a global.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CpPtD7tCRwRZZnREhWcJi8

csaxs_bec/bec_ipython_client/plugins/flomni/flomni.py

@@ -1760,9 +1760,15 @@ class Flomni(
     cSAXSBeamlineChecks,
     flomniGuiTools,
 ):
-    def __init__(self, client):
+    # Backed by a BEC global var (Redis) so the pre-open slit position
+    # survives a kernel restart while the eye is still in.
+    _sl1xs_before_eye = _GlobalVarParam(None)
+    _sl1ys_before_eye = _GlobalVarParam(None)
+
+    def __init__(self, client, csaxs=None):
         super().__init__()
         self.client = client
+        self.csaxs = csaxs
         self.device_manager = client.device_manager
         self.special_angles = []
         self.special_angle_repeats = 20

csaxs_bec/bec_ipython_client/plugins/flomni/flomni_optics_mixin.py

@@ -25,6 +25,36 @@ class FlomniOpticsMixin:
 
     def feye_out(self):
         dev.fsh.fshclose()
+
+        if self.csaxs is not None:
+            self.csaxs.fil_trans(1, print_only=False)
+
+        sl1xs_before = self._sl1xs_before_eye
+        sl1ys_before = self._sl1ys_before_eye
+        if sl1xs_before is not None and sl1ys_before is not None:
+            # if the slit was manually re-adjusted while the eye was in,
+            # offer to keep the current size instead of restoring the
+            # pre-eye value
+            current_sl1xs = dev.sl1xs.user_readback.get()
+            current_sl1ys = dev.sl1ys.user_readback.get()
+            expected_sl1xs = sl1xs_before + 0.3
+            expected_sl1ys = sl1ys_before + 0.3
+            tol = 0.01  # mm (10 microns)
+            manually_adjusted = not np.isclose(
+                current_sl1xs, expected_sl1xs, atol=tol
+            ) or not np.isclose(current_sl1ys, expected_sl1ys, atol=tol)
+
+            if manually_adjusted and self.OMNYTools.yesno(
+                "sl1xs/sl1ys appear to have been adjusted manually while the "
+                "eye was in. Keep the current slit size instead of "
+                "restoring the pre-eye value?"
+            ):
+                print("Keeping current slit size, not restoring pre-eye value.")
+            else:
+                umv(dev.sl1xs, sl1xs_before, dev.sl1ys, sl1ys_before)
+            self._sl1xs_before_eye = None
+            self._sl1ys_before_eye = None
+
         self.foptics_in()
         self.flomnigui_show_xeyealign()
         self.xrayeye_update_frame()
@@ -34,6 +64,7 @@ class FlomniOpticsMixin:
             print("Aborting. With visible parts of the direct beam on the xray eye, it cannot be removed.")
             return
         feyex_out = self._get_user_param_safe("feyex", "out")
+
         umv(dev.feyex, feyex_out)
 
         # move rotation stage to zero to avoid problems with wires
@@ -78,6 +109,14 @@ class FlomniOpticsMixin:
             # both already in position → do nothing
             pass
         else:
+            if "sl1xs" in dev and "sl1ys" in dev:
+                self._sl1xs_before_eye = dev.sl1xs.user_readback.get()
+                self._sl1ys_before_eye = dev.sl1ys.user_readback.get()
+                scans.umv(dev.sl1xs, 0.3, dev.sl1ys, 0.3, relative=True)
+
+            if self.csaxs is not None:
+                self.csaxs.fil_trans(0.05, print_only=False)
+
             # move both axes to the desired "in" positions
             umv(dev.feyex, feyex_in, dev.feyey, feyey_in)
 

csaxs_bec/bec_ipython_client/startup/post_startup.py

@@ -85,7 +85,10 @@ elif _args.session.lower() == "flomni":
     from csaxs_bec.bec_ipython_client.plugins.flomni import Flomni
 
     _session_name = "flomni"
-    flomni = Flomni(bec)
+    if "fttrx1" in dev:
+        flomni = Flomni(bec, csaxs=csaxs)
+    else:
+        flomni = Flomni(bec)
     logger.success("flomni session loaded.")
     print(r"""
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