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| | Hello and welcome. My name is Ling. Some time ago he selected to live in Idaho. Playing croquet is some thing I will by no means give up. I am a production and distribution officer.<br><br>Here is my blog: [http://Owenphelps.com/UserProfile/tabid/355/userId/172983/Default.aspx http://Owenphelps.com] |
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| In [[particle physics]] experiments a '''detection of internally reflected Cherenkov light''' (DIRC) detector measures the [[velocity]] of [[charged particle]]s and is used for [[particle identification]]. It is a design of a [[ring imaging Cherenkov detector]] where [[Cherenkov radiation|Cherenkov light]] that is contained by [[total internal reflection]] inside the solid radiator has its angular information preserved until it reaches the light sensors at the detector perimeter.
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| [[File:DIRC Schema01 2009-08-13.svg|thumb|right|The Cherenkov light is following a zigzag path between parallel surfaces. The light detectors would be positioned to the right.]]
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| A charged particle travelling through a material (for instance [[quartz]]) with a speed greater than c/n (n [[refractive index]], c [[speed of light|vacuum speed of light]]) emits Cherenkov radiation. If the light angle on the surface is sufficiently shallow, this radiation is contained inside and transmitted through internal reflections to a stand-off box which contains [[photomultiplier]]s (or other types of photon detectors) to measure the angle. Preserving the angle requires a precise planar or rectangular cross section of the radiator. Knowledge of the angle at which the radiation was produced, combined with the track angle and the particle's momentum (measured in a tracking detector like a [[drift chamber]]) may be used to calculate the particle's mass.
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| A DIRC was first proposed by [[Blair Ratcliff]] as a tool for particle identification at a [[B-Factory]], and the design was first used by the [[BaBar experiment|BaBar]] collaboration at [[SLAC]]. The DIRC differs from earlier [[ring-imaging Cherenkov detector|RICH]] and [[CRID (detector)|CRID]] Cherenkov light detectors in that the quartz bars used as radiators also transmit the light.
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| <!--
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| provided that <math>n \beta > 1</math> (where ''n'' is the [[index of refraction]] in the quartz
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| and <math>\beta = v/c</math> is the particle's velocity measured in c)
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| -->
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| == See also ==
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| * [http://www.slac.stanford.edu/BFROOT/www/Detector/DIRC/PID.html BaBar DIRC homepage]
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| *{{cite journal
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| |author=
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| |year=2003
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| |title=Imaging rings in Ring Imaging Cherenkov counters
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| |journal=[[Nuclear Instruments and Methods in Physics Research A]]
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| |volume=502 |pages=211–221
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| |dpo=
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| |doi=10.1016/S0168-9002(03)00276-6
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| |last1=Ratcliff
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| |first1=B
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| |bibcode = 2003NIMPA.502..211R }}
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| * {{cite journal|author1= C Lu |author2= D Marlow |author3= C Mindas |year=1996|title= Detection of internally reflected Cherenkov light, results from the BELLE DIRC prototype |journal= Proceedings of the Second International Workshop on Ring Imaging Cherenkov Detectors | volume=371|pages= 82–86 |url= http://www.sciencedirect.com/science/article/pii/0168900295012567 |doi=10.1016/0168-9002(95)01256-7}}
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| * {{cite journal|author1= P. Coyle |author2= H. Kawahara |author3= A. Lu |year=1994 |title= The DIRC counter: a new type of particle identification device for B factories | volume=343|pages= 292–299|url= http://www.sciencedirect.com/science/article/pii/0168900294905681 |doi=10.1016/0168-9002(94)90568-1}}
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| * {{cite web| author1= H. Salazar|author2= E. Moreno |author3= T. Murrieta |title= Detection of Cherenkov Photons with Multi-Anode Photomultipliers |url= http://www.sciencedirect.com/science/article/pii/0168900294905681}}
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| {{DEFAULTSORT:Detection Of Internally Reflected Cherenkov Light}}
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| [[Category:Particle physics]]
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Hello and welcome. My name is Ling. Some time ago he selected to live in Idaho. Playing croquet is some thing I will by no means give up. I am a production and distribution officer.
Here is my blog: http://Owenphelps.com