Extract beam energy from experiments (#262)

Author: RemiLehe

experimental_data/staging_injector/extract_data.py

@@ -31,13 +31,13 @@
     "Valve01": "MANPAR-BELLA-ValveN2Frac value1 Alias:Valve01",
     "Cap Up (torr)": "GAUGE-PL1-CapPressure pressure Alias:Cap Up (torr)",
     "Cap downstream (torr)": "GAUGE-PL1-CapPressure pressure2 Alias:Cap downstream (torr)",
+    "Beam mean energy [GeV]": "MGS peakMomentum_GeV/c",
     "EBeamPrf charge [pC]": "EBeamPrf charge [pC]",
     "EBeamPrf fwhm div x [mrad]": "EBeamPrf fwhm div x [mrad]",
     "SPEC-AA-Hamamastsu lambda_b": "SPEC-AA-Hamamastsu lambda_b",
     "SPEC-AA-Hamamastsu lambda_r": "SPEC-AA-Hamamastsu lambda_r",
 }
 unavailable_data = [
-    "Beam mean energy [GeV]",
     "Beam energy spread [%]",
 ]
 
@@ -157,4 +157,4 @@ def on_created(self, event):
             time.sleep(1)
     except KeyboardInterrupt:
         observer.stop()
-    observer.join()
+    observer.join()