ForwardCalorimeter < Tagpid

You are here: PANDA Wiki>Tagpid Web>TasksandResults>ForwardCalorimeter (26 Apr 2006, AleksandraWronska) (raw view)EditAttach

---++ Objectives of the Shashlyk Calorimeter

   * *&#960;/e discrimination*
   * energy, position and time measurement

---++ TPR Layout of a Shashlyk module

<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="200"> Number of layers </td> <td> 378</td>
</tr>
<tr>
<td> Scintillator layer thickness </td> <td> 1.5 mm </td>
</tr>
<tr>
<td> Lead layer thickness </td> <td> 0.275 mm </td>
</tr>
<tr>
<td> Effective Moliere radius </td> <td> 59.8 mm </td>
</tr>
<tr>
<td> Radiation depth  </td> <td> 20 X<sub>0</sub> </td>
</tr>
<tr>
<td> Lateral dimensions </td> <td>  110 x 110 mm<sup>2</sup></td>
</tr>
<tr>
<td collspan="2">&nbsp;</td>
</tr>
<tr>
<td>Energy resolution </td> <td> 4.&#37; / sqrt(E) </td>
</tr>
<tr>
<td> Time resolution </td> <td> 100 ps / sqrt(E) </td>
</tr>
</table>

---++ Results of simulations

Piotr Hawranek performed simulations of the calorimeter electron/pion separation (Panda meeting Dec'06). He used the so-called _old code_.
Simulation comprised:

   * &#960;<sup>-</sup> and e<sup>-</sup> beams of 1 and 5 GeV/c momentum
   * setup with modules of various lateral dimensions

Detector response and cuts imposed in order to select electrons of 5 GeV/c momentum in the 110 x 110 mm<sup>2</sup> modules are shown as an example of the procedure.
<br />
<center>
    <img src="%ATTACHURLPATH%/ecal.gif" alt="" width="50%" />
</center>

Results of the simulations are summarised in the table below.

   * *5 GeV/c*

<table border="1" cellspacing="0" cellpadding="0">
<tr>
<td width="120" align="center"><b>Module size</b></td> <td width="120" align="center"><b>e<sup>-</sup> identified</b></td> <td align="center" width="120"><b>&#960;<sup>-</sup> identified as e<sup>-</sup></b></td>
</tr>
<tr>
<td align="center">30 x 30 mm<sup>2</sup></td> <td align="center">84.6&#37;</td> <td align="center">0.2&#37;</td>
</tr>
<tr>
<td align="center">55 x 55 mm<sup>2</sup></td> <td align="center">93.3&#37;</td> <td align="center">0.4&#37;</td>
</tr>
<tr>
<td align="center">110 x 110 mm<sup>2</sup></td> <td align="center">97.4&#37;</td> <td align="center">0.8&#37;</td>
</tr>
</table>

   * *1 GeV/c*

<table border="1" cellspacing="0" cellpadding="0">
<tr>
<td width="120" align="center"><b>Module size</b></td> <td align="center" width="120"><b>e<sup>-</sup> identified</b></td> <td align="center" width="120"><b>&#960;<sup>-</sup> identified as e<sup>-</sup></b></td>
</tr>
<tr>
<td align="center">55 x 55 mm<sup>2</sup></td> <td align="center">96.2&#37;</td> <td align="center">4.7&#37;</td>
</tr>
<tr>
<td align="center">110 x 110 mm<sup>2</sup></td> <td align="center">98.1&#37;</td> <td align="center">8.7&#37;</td>
</tr>
</table>

It should be stressed here, that the analysis procedure was rather rough. Certainly, application of a more sophisticated tools (_e.g._ Bayes theorem) could improve the results. The trend, however, is clear already from the presented numbers.


-- Main.AleksandraWronska - 26 Apr 2006

Topic attachments
I	Attachment	Action	Size	Date	Who	Comment
gif	ecal.gif	manage	9.1 K	26 Apr 2006 - 07:58	AleksandraWronska	pi/e separation

Topic revision: r1 - 26 Apr 2006, AleksandraWronska

Tagpid

Tagpid Web
Web Home | Search Changes | Notifications Index | Topics

Webs
- Cerenkov
- Cerenkov.Pandacerenkov
- DCS
- Daq
- Daq.Pandadaq
- Detector
- EMC
- EMPAnalysis
- Forwardstraws
- GEM
- MC
- Magnet
- Main
- Mvd
- PANDAMainz
- PWA
- Pbook
- Personalpages
- Physics
- Physics.Baryons
- Physics.CharmoniumAndExotics
- Physics.HadronsInNuclei
- Physics.OpenCharm
- PhysicsCmt
- SPC
- STT
- Sandbox
- ScrutinyGroup
- System
- Tagpid
- Tagpid.Pandatagpid
- Tagtrk
- Tagtrk.Pandatagtrk
- Target
- Target.ClusterJetTarget
- Tof
- WebServices
- YoungScientists
- ZArchives

Create personal sidebar

Copyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding PANDA Wiki? Send feedback
Imprint (in German)
Privacy Policy (in German)