Some Event displays from beam running
Two easy events
First of all to get your eye in, the simplest of the simple: a paricle going straight through the centre. The way i have arranged things here has
- Left upper panel
- View from the side of the DsECal, (as you would see it from the counting room if the shield wasn't there)
- Left lower panel
- View from above the detector
- Right panel
- 3D display, generally looking from the same side as the Left lower pannel
The beam goes from right to leftBR attachment:eveDisp_simple1.jpg
Here is a more complex example using timing cuts
I am looking at event 8 from dsecal_00010114_0000.daq.mid
First with no cuts, the event looks a mess... attachment:testbeameventnocuts.png
Now apply a charge threshold cut at 10 using the "Palette" slider control: "Eve tab">Event>TripT>ED00
attachment:testbeameventchargethreshold.png
Still a mess because there are several overlapping events. Look at the timing hisrogram, the large spike at the left is from hits with bad timing information.
attachment:testbeameventtimingnocuts.png
By selecting on the x axis, zoom in on the good timing information, now you can see the 23 buckets, and clearly see more activity in some of them.
attachment:testbeameventtiminggoodony.png
Zoom in again on just one bin.
attachment:testbeameventtimingonebin.png
now apply this cut to the data: ND280 Event Control tab> (Timing Cuts) Apply
attachment:testbeameventchargethresholdandtimingcut.png
and one clean MIP is visible.
This final picture show a snapshot of the whole program running. I have swapped the 3D display and the Front display on the "Multiple Views" tab, turned off the display of all scintillator bars ( they are 97% transparent in the picturs above) and turned on the axis in the 3D display. Left as an exercise for the reader!
attachment:EveDisplayOfTestBeamEvent.png
["Calibration"]