[Halld-pid-upgrade] Fwd: [Halld-elog][PID-Upgrade] HDGeant (GEANT3) Simulation of DIRC

[Yi Qiang]

Hi all,

I added the DIRC detector into the HDGeant HDDS geometry. For more 
details, refer to the following elog entry:
https://halldweb1.jlab.org/elog-halld/PID_Upgrade/10

The RICH library has also been updated with a new RichTruthHit factory 
to extract all useful information of particles entering the DIRC. 
Accordingly, the JANA plugin mc_tree has been updated too to utilize 
this new factory.

Let me know if you have any questions using the new codes, and attached 
is an example of accumulated hits generated by 4GeV pions (1000 events).

Cheers,
Yi


-------- Original Message --------
Subject: 	[Halld-elog][PID-Upgrade] HDGeant (GEANT3) Simulation of DIRC
Date: 	Tue, 08 Oct 2013 16:04:33 -0400
From: 	Yi Qiang <yqiang at jlab.org>
To: 	Yi Qiang <yqiang at jlab.org>, Baptiste Guegan <guegan at mit.edu>, Mark 
Dalton <dalton at jlab.org>



PID_Upgrade - HDGeant (GEANT3) Simulation of DIRC
An old ELOG entry has been updated:
Logbook: *PID_Upgrade*  Message ID: *10* 
<https://halldweb1.jlab.org/elog-halld/PID_Upgrade/10>    Entry time: 
*10/08/2013 13:00*
Author: 	Yi Qiang
Project: 	DIRC
Category: 	Simulation
Subject: 	HDGeant (GEANT3) Simulation of DIRC


    hdds-1.5d

Three files in existing hdds-1.5 has been added/modified to include a 
DIRC detector in HDGeant:

 1. DIRC_HDDS.xml
 2. main_HDDS.xml
 3. Material_HDDS.xml

At this momentum, since the detector is still preliminary, the files are 
not included in the standard Hall-D hdds release. Instead, one can check 
out these three files from:

https://halldsvn.jlab.org/repos/trunk/home/yqiang/HDDS/hdds-1.5d/

Two sensitive volumes used to save hits are

 1. *RAWN*: DIRC window, used to save tracks entering DIRC sensitive
    area, produces |*RichTruthHit*|
 2. *RDCD*: DIRC photo-cathode, used to save photoelectrons collected by
    the readout, produce *|RichHit|*

The geometry of the detector follows the attached drawing. An aluminum 
box with 1mm wall thickness is used to contain the detector, and the 
thickness is derived from the effective radiation length brought by the 
BaBar DIRC package ~ 17%(total) - 14%(quartz bar) = 3%(box).


    Visualization in HDGeant++


    RICH Factories in sim-recon

Since rev9775, the standard Hall-D reconstruction package (*sim-recon*) 
includes the necessary RICH library to process hits in RICH window 
(*RAWN*) through |DMCTrackHit| factory and photo-cathode (*RDCD*) 
through |DRichHit| factory.

In order to extract all information of particles entering RICH window, a 
new factory, |*DRichTruthHit*|, has been added and checked in rev11686. 
The factory can be used to save all information such as: |x, y, z, px, 
py, pz, t, E, track, primary ||and ptype|:

RICH library: 
https://halldsvn.jlab.org/repos/trunk/sim-recon/src/libraries/RICH/

HDDM library: 
https://halldsvn.jlab.org/repos/trunk/sim-recon/src/libraries/HDDM/


    JANA Plug-in

*mc_tree*: 
https://halldsvn.jlab.org/repos/trunk/sim-recon/src/programs/Analysis/plugins/mc_tree/

mc_tree has been updated to use the newly created |*DRichTruthHit*| 
factory in rev11687.

ELOG V2.9.0-2411 <https://midas.psi.ch/elog/>



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