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--- s800_spectcl [2013/12/12 12:52]
pereira [Frequently used parameters for the S800]
+++ s800_spectcl [2013/12/12 13:55]
pereira [<sup>124</sup>Sn primary beam passing a thick Al viewer at the target position (focused optics)]
@@ Line 18: / Line 18: @@
-==== Frequently used parameters for the S800 ====
+==== Frequently used parameters for S800 SpecTcl ====
   * **s800.fp.ic.sum**: energy loss measured with the ion chamber
@@ Line 38: / Line 38: @@
-Important Variables
+==== Frequently used variables for S800 SpecTcl ====
 (to be set on the "Variables" page of the GUI)
  for the CRDCs (n=1,2 for crdc1 and crdc2):
-•	s800.fp.crdcn
-o	.x_offset: offset in the x calibration, chosen to center the "beam hole" (see mask calibration) at 0 mm.
-o	.x_slope: the slope of the x calibration. This value is always 2.54 mm/pad since the geometry of the pads inside the CRDCs is fixed
-o	.y_offset: y offset in mm to be determined from the mask calibration
-o	.y_slope: y slope in mm/ns to be determined from the mask calibration
-•	s800.fp.crdcn.calc
+  * **s800.fp.crdc1** and **s800.fp.crdc2**
-o	.method: 1 sets "center of gravity" as method to determine the x position from the charge distribution in the pads, 2 enables the usage of the fit method
+    * **.x_offset**: offset in the x calibration, chosen to center the "beam hole" (see mask calibration) at 0 mm.
-o	.gravity_width: sets the number of pads used to determine the center of gravity
+    * **.x_slope**: the slope of the x calibration. This value is always 2.54 mm/pad since the geometry of the pads inside the CRDCs is fixed
-o	.fit_width: number of pads taken for the Gaussian fit
+    * **.y_offset**: y offset in mm to be determined from the mask calibration
-o	.badpads: total number of pads declared as "bad" (see point below)
+    * **.y_slope**: y slope in mm/ns to be determined from the mask calibration
-o	.badpad.mm: declares pad no. mm as "bad pad" and removes it from the calculation that determines the x position
+  * **s800.fp.crdc1.calc** and **s800.fp.crdc2.calc**
+    * **.method**: 1 sets "center of gravity" as method to determine the x position from the charge distribution in the pads, 2 enables the usage of the fit method
+    * **.gravity_width**: sets the number of pads used to determine the center of gravity
+    * **.fit_width**: number of pads taken for the Gaussian fit
+    * **.badpads**: total number of pads declared as "bad" (see point below)
+    * **.badpad.mm**: declares pad no. mm as "bad pad" and removes it from the calculation that determines the x position
+  * **s800.fp.track**
+    * **.order**: sets the order to which the reconstruction (inverse map) will be performed (typically 5th order)
+    * **.map.maxorder**: determined by the inverse map. The maximum order is typically 5 and set automatically as soon as the inverse map is sourced in SpecTcl
+    * **.anglea** and **angleb**: offset in angle (dispersive and non-dispersive) of the incoming beam hitting the target. The reconstruction assumes a beam without initial angles. The variables anglea and angleb have to be adjusted to center the angle distribution in the spectrum "bta vs. ata" so that the incoming angles are accounted for in the reconstruction
+  * **s800.tof**
+    * **.objCorrection**, **.obje1Correction**, **.obje2Correction**: corrections applied to the TOF measured between the object scintillator and the trigger scintillator. Details of the corrections will change from experiment to experiment and are accessible via the CS800.cpp file of the S800 SpecTcl source code
+    * **.xfpCorrection**, **.xfpe1Correction**, **.xfpe2Correction**: corrections applied to the TOF measured between the extended focal plane scintillator (A1900) and the trigger scintillator. Details of the corrections will change from experiment to experiment and are accessible via the CS800.cpp file of the S800 SpecTcl source code
-•	s800.fp.track
+===== Sample spectra =====
-o	.order: sets the order to which the reconstruction (inverse map) will be performed (typically 5th order)
+The following figures depict some of the S800 SpecTcl spectra used for the tunning of the S800.
-o	.map.maxorder: determined by the inverse map. The maximum order is typically 5 and set automatically as soon as the inverse map is sourced in SpecTcl
-o	anglea and angleb: offset in angle (dispersive and non-dispersive) of the incoming beam hitting the target. The reconstruction assumes a beam without initial angles. The variables anglea and angleb have to be adjusted to center the angle distribution in the spectrum "bta vs. ata" so that the incoming angles are accounted for in the reconstruction
-•	s800.tof
+==== Energy loss in the ion chamber vs. time of flight measured between the object scintillator and the E1 scintillator (trigger) at the end of the focal plane ====
-o	objCorrection, obje1Correction, obje2Correction: corrections applied to the TOF measured between the object scintillator and the trigger scintillator. Details of the corrections will change from experiment to experiment and are accessible via the CS800.cpp file of the S800 SpecTcl source code
-o	xfpCorrection, xfpe1Correction, xfpe2Correction: corrections applied to the TOF measured between the extended focal plane scintillator (A1900) and the trigger scintillator. Details of the corrections will change from experiment to experiment and are accessible via the CS800.cpp file of the S800 SpecTcl source code
+{{:wiki:s800_pid.jpg?600}}
+//
+//
+//
+//
+//
+//
+====(In)elastic scattering of the incoming "cocktail beam" on a 256 mg/cm<sup>2</sup> Au target (spectrograph in focus mode) ====
+{{:wiki:s800_identification.jpg?600}}
+**Upper left**: Three 124Sn charge states in the CRDC2 x-y spectrum
+**Upper right**: Amplitude of the CRDC2 anode signal vs. drift time (this is a diagnostics spectrum showing that the response of the CRDC is not correlated with the y position).
+**Lower left**: Raw drift time measured in CRDC2
+**Lower right**: Charge distribution induced in the pads by the three 124Sn charge states hitting CRDC2.
+==== Sn-124 primary beam passing a thick Al viewer at the target position (focused optics) ====
+{{:wiki:working_crdc2_sn124.jpg}}

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