[Dsg-rich] question about richmon plots

[Marco Mirazita]

Hi Tyler,


Il 2018-02-28 22:11 Tyler Lemon ha scritto:
> Hello Andrey and Valery,
> 
> I've been looking at the plots generated by richmon and have some
> questions.
> 
> 1.) For the TDC plot, what are the axes? Is x-axis a time and y-axis a
> frequency?
> 
In the TDC occupancy plot, the x-axis is channel number in the tile, 
from 0 to 191. If the tile is x2 the channels from 64 to 127 are empty. 
The y-axis is the tile id. For some reason the last few tiles are still 
missing (gray band on top). The color scale shows the counts.

In the TDC-time plot, the x-axis is time in ns, the y-axis is channel id 
from 0 to 25023, the color scale shows the counts.

> 2.) For the TDC plot, I saw a logbook entry saying black was the
> leading edge and red was the trailing edge. What is meant by leading
> edge and trailing edge?
> 
Leading and trailing edge is when the shaped signal crosses the 
threshold.


> 3.) For the multiplicity plot, is it correct to say that it is a
> histogram where the x-axis is number of hits, y-axis is frequency, and
> the items binned are events? For example, if there is an event with 10
> hits, it would be counted in the bin corresponding to 10 hits.
> 
See above.

> 4.) What is classified as a hit? Is it an event measured by a pixel or
> by a PMT? For example, if an event shows only one PMT had three pixels
> hit, is it counted as three hits for the number of pixels or one hit
> for the number of PMTs?
> 
As far as I know, these monitoring plots show raw data, thus a hit is 
defined as a signal crossing the threshold. A reconstructed hit is made 
by one trailing and one leading edge, but the hit reconstruction is done 
offline.

> Also is there a document that describes what the settings mean on the
> occupancy plot tab? Would there be anything like this on the RICH
> wiki?
> 
We don't have a document describing in details the electronics. You can 
look at the RICH expert manual 
(https://wiki.jlab.org/clas12-run/index.php/Run_Group_A) or at the 
publications 
(https://clasweb.jlab.org/wiki/index.php/RICH_Publications).


Marco



> Thanks for your help.
> 



> Best regards,
> 
> Tyler
> 
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