You are here:
PANDA Wiki
>
STT Web
>
GeneralDescription
(revision 9) (raw view)
Edit
Attach
---++ General Description -- Main.PeterWintz - 04 Nov 2013 <img align="right" alt="STT x-y view" height="251" src="%ATTACHURLPATH%/STT_xyview.jpg" width="240" /> The central Straw Tube Tracker (STT) in the PANDA target spectrometer features a high-resolution spatial and momentum reconstruction of charged particle trajectories in a broad momentum range from about 100 _MeV/c_ to 8 _GeV/c_. In addition, a particle identification of protons, kaons, and pions in the momentum region below 1 _GeV/c_ has to be done exclusively by the STT, with a measurement of the particles' specific energy-loss. The STT design is optimised for a minimal material budget by the technique of self-supporting straw layer modules. The detector is essential for the online track reconstruction and track association to events in the PANDA specific environment of about 150 tracks from 40 individual events within 2 µs. The detector consists of 4636 straw tubes, each with a length of 1400 mm and 10 mm inner diameter. The wall thickness of the aluminised mylar film tube is 27 µm. The tubes are pressurized to 1 bar overpressure (2 bar absolute pressure) and glued together to close-packed, self-supporting multi-layers which sustain the wire tension and tube stretching equivalent to 230 kg and 3.2 tons (sum for 4636 tubes). The straws are arranged in two semi-barrels around the beam pipe with a few cm gap to leave space for the vertical target pipe. <img align="right" alt="STT 3-D view" height="217" src="%ATTACHURLPATH%/STT_3Dview.jpg" width="245" /> | *STT Dimensions* || | Inner radius | 15 cm | | Outer radius | 42 cm | | Total length | 171 cm | | Material budget (radial) | 1.23 % (X/X0) | | *Specifications* || | Number of straws | 4636 | | Straw length | 1400 mm | | Straw diameter (inner) | 10 mm | | Straw pitch | 10.14 mm | | Straw film tube | Mylar (aluminised) | | Straw wall thickness | 27 µm | | Sense wire | W/Rh | | Wire diameter | 20 µm | | Number of axial layers | 15-19 | | Number of stereo layers | 8 | | Stereo angle | +2.9, -2.9 deg | | Gas mixture | Ar/CO2(10%) | | Gas pressure | 2 bar (absolute) | | Maximum drift time (2T-field) | ~ 200 ns | | Spatial resolution (sigma) | 150 µm (xy), 2-3 mm (z) | | Energy resolution (dE/dx) | < 10 % | | Maximum rate (innermost layer) | < 1 MHz/straw, < 7-14 kHz/cm | | Mean charge load | 0.2 C / cm | Back to [[STT.WebHome]]
Attachments
2
Attachments
2
Topic attachments
I
Attachment
Action
Size
Date
Who
Comment
jpg
STT_3Dview.jpg
manage
30.2 K
04 Nov 2013 - 14:16
PeterWintz
STT 3-D view
jpg
STT_xyview.jpg
manage
52.9 K
04 Nov 2013 - 14:14
PeterWintz
STT x-y view
Edit
|
Attach
|
P
rint version
|
H
istory
:
r11
|
r10
<
r9
<
r8
<
r7
|
B
acklinks
|
V
iew topic
|
Edit WikiText
|
More topic actions...
Topic revision: r9 - 27 Mar 2014,
PeterWintz
STT
STT 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
Български
_jméno_jazyka
Dansk
Deutsch
English
Español
Suomi
Français
Italiano
日本語
한글
Nederlands
Norsk
Polski
Português
Português brasileiro
Русский
Svenska
简体中文
正體中文
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)