(r2) TpC < Tagpid/Pandatagpid

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---++ Purpose

*Tracking:*
The TPC is discussed as a solution for the outer tracking within the target spectrometer. The required momentum resolution is ~1%, the required vertex resolution ~150um in the xy plane and < 1cm in z direction.
 
*PID:*
In the momentum range below ~1GeV and above ~2GeV the TPC provides information for particle identification within the target spectrometer. Especially for particles with momenta below ~1GeV this is of great help for the overall PID performance and to supplement the information from the barrel DIRC.

---++ Working principle (in short)

*General:*
3D tracking device - charged particles ionize detector gas - electric field along cylinder axis separates positive gas ions from electrons - primary electrons drift towards readout anode - gas amplification done by GEM foils - ungated, continuous operation mode due to HESR beam properties - intrinsic ion feedback suppression by GEM foils - continuous data readout within PANDA DAQ - parallel online data reduction and processing (including tracking) 

*PID:*
performed via measurement of mean energy loss per track length (dE/dx), described by Bethe-Bloch-formula, in combination with (obligatory) momentum measurement - PANDA TPC offers to do ~50-100 (fluctuating) energy loss measurements per track - truncated mean algorithm used to get rid off Landau tail and to calculate mean   

<br>
<center>
<img src="%ATTACHURLPATH%/tpc-gem_principle.png" alt="GEM-TPC working principle"  width="408" height="275"  />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<img src="%ATTACHURLPATH%/TPC_Geom.png" alt="TPC geometry from simulation"  width="388.41" height="275"  />
</center>

---++ Important values

---++ First estimates and simulations

---

-- Main.QuirinWeitzel - 10 May 2006

Topic attachments
I	Attachment	Action	Size	Date	Who	Comment
png	TPC_Geom.png	manage	318.2 K	15 May 2006 - 15:14	QuirinWeitzel	TPC geometry from simulation
png	tpc-gem_principle.png	manage	35.7 K	15 May 2006 - 14:44	QuirinWeitzel	GEM-TPC working principle

Topic revision: r2 - 15 May 2006, QuirinWeitzel

Tagpid/Pandatagpid

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