Difference: BarrelDirc (1 vs. 14)

Revision 14
29 Nov 2007 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Revision 13
29 Nov 2007 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Line: 73 to 73
  -- GeorgSchepers - 05 May 2006
Changed:
<
<

>
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-- DircPlayground
 

META FILEATTACHMENT attr="" comment="Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls." date="1145454603" name="kkgamma.gif" path="kkgamma.gif" size="62874" user="GeorgSchepers" version="1.1"
META FILEATTACHMENT attr="" comment="Identification Efficiency for Kaons and pions" date="1145957508" name="identification_alone.gif" path="identification_alone.gif" size="12358" user="GeorgSchepers" version="1.1"
Revision 12
25 Sep 2007 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Revision 11
12 Oct 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Revision 10
15 May 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Revision 9
05 May 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Line: 38 to 38
 

Changed:
<
<
  • Correlation of Cherencov angle thetaCh as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.:
    Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.
>
>
  • Correlation of Cherenkov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.:
    Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.
 
Changed:
<
<
  • The resolution of the track Cherenkov angle sigma_track should scale with the number of photons detected:
>
>
  • The resolution of the track Cherenkov angle sigma_track scales with the square root of the number of photons detected:
 
Changed:
<
<
sigma_track = sigma_single / sqrt(N_ph)
>
>
sigma_track(theta) = sigma_single(theta) / sqrt(N_ph)
 
Added:
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  • Thus we find approximatively the separation of two particle species, i.e. numbers of sigma (N(sigma)), with masses m1 and m2 (Ref. PDG):
 
Added:
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N(sigma) ~= |m1*m1 - m2*m2| / (2 * p*p * sigma_track(theta) * sqrt(n*n-1))
 
Added:
>
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  • To provide usefull results the DIRC should produce 15 to 20 photons per particle track. The correlation calculated with a photon number of 16 is shown in the figure bellow.
 
Changed:
<
<
  • Identification Efficiency for Kaons and pions (Ref. CDR):
>
>
  • Correlation between number of sigma's of seperation N(sigma) and the momentum of the particles for 16 photons per track and a single photon angle resolution of 10mrad.:
    Number of sigma's of seperation

  • Identification Efficiency for kaons and pions (Ref. CDR):
  Identification Efficiency for Kaons and pions

  • It is show the probability to misidentify a pion as a kaon as a function of the particle momentum (red circles) and the efficiency to identify a kaon (open circles)
Line: 56 to 64
 

  • Material Budget:
Changed:
<
<
  • with 17mm (of thickness) of fused silica the DIRC bars present approximately 14% of a radiation length to normal incident particles
>
>
  • with 17mm (of thickness) of fused silica the DIRC bars present approximately 14% of a radiation length to normal incident particles. The support structure will add some more percent.
 

Changed:
<
<
-- GeorgSchepers - 25 Apr 2006
>
>
-- GeorgSchepers - 05 May 2006

 

META FILEATTACHMENT attr="" comment="Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls." date="1145454603" name="kkgamma.gif" path="kkgamma.gif" size="62874" user="GeorgSchepers" version="1.1"
Deleted:
<
<
META FILEATTACHMENT attr="" comment="Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad." date="1145954765" name="corr_ang_mom.gif" path="corr_ang_mom.gif" size="4284" user="GeorgSchepers" version="1.1"
 
META FILEATTACHMENT attr="" comment="Identification Efficiency for Kaons and pions" date="1145957508" name="identification_alone.gif" path="identification_alone.gif" size="12358" user="GeorgSchepers" version="1.1"
Added:
>
>
META FILEATTACHMENT attr="" comment="Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad." date="1146845426" name="corr_ang_mom1.jpg" path="corr_ang_mom1.jpg" size="42971" user="GeorgSchepers" version="1.1"
META FILEATTACHMENT attr="" comment="NUmber of sigma's of seperation" date="1146845484" name="corr_ang_mom2.jpg" path="corr_ang_mom2.jpg" size="32451" user="GeorgSchepers" version="1.1"
Revision 8
25 Apr 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Line: 30 to 30
 

Changed:
<
<
  • Single Photon Cherenkov Angle Resulution
>
>
  • Single Photon Cherenkov Angle Resolution
 

    • with a DIRC-Bar size of 17x30x2000mm, a distance of l=1.20m of the photomultipiers from the bar exit and a diameter of the photomultiplier cathods of 2cm ( beeing equal to the distance of the centers of the cathods) the geometric contribution of the Single Photon Cherenkov Angle Resulution can be calculated and lies in the order of magnitude of 10mrad
Line: 41 to 43
 

    • The resolution of the track Cherenkov angle sigma_track should scale with the number of photons detected:
Changed:
<
<
      • sigma_track = sigma_single / sqrt(N_ph)
>
>
sigma_track = sigma_single / sqrt(N_ph)
 

Line: 52 to 54
 
  • It is show the probability to misidentify a pion as a kaon as a function of the particle momentum (red circles) and the efficiency to identify a kaon (open circles)
Added:
>
>
  • Material Budget:

  • with 17mm (of thickness) of fused silica the DIRC bars present approximately 14% of a radiation length to normal incident particles
 

Revision 7
25 Apr 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Line: 25 to 25
 

Added:
>
>

 

FIRST Estimations:

Added:
>
>

 

  • Single Photon Cherenkov Angle Resulution
Line: 33 to 36
 

    • to this geometric contribution the resolution contribution (comming from the production and the transmission dispersion) has to be added which has a values of similar size

Added:
>
>
  • Correlation of Cherencov angle thetaCh as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.:
    Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.

    • The resolution of the track Cherenkov angle sigma_track should scale with the number of photons detected:

      • sigma_track = sigma_single / sqrt(N_ph)

 
Added:
>
>
  • Identification Efficiency for Kaons and pions (Ref. CDR):
    Identification Efficiency for Kaons and pions
 

Added:
>
>
  • It is show the probability to misidentify a pion as a kaon as a function of the particle momentum (red circles) and the efficiency to identify a kaon (open circles)
 
Deleted:
<
<
  • Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.:
    Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.
 

Changed:
<
<
-- GeorgSchepers - 24 Apr 2006
>
>
-- GeorgSchepers - 25 Apr 2006
 

META FILEATTACHMENT attr="" comment="Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls." date="1145454603" name="kkgamma.gif" path="kkgamma.gif" size="62874" user="GeorgSchepers" version="1.1"
Changed:
<
<
META FILEATTACHMENT attr="" comment="Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad." date="1145900207" name="cherenkov_angle_momentum_resolution.gif" path="cherenkov_angle_momentum_resolution.gif" size="5776" user="GeorgSchepers" version="1.1"
>
>
META FILEATTACHMENT attr="" comment="Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad." date="1145954765" name="corr_ang_mom.gif" path="corr_ang_mom.gif" size="4284" user="GeorgSchepers" version="1.1"
META FILEATTACHMENT attr="" comment="Identification Efficiency for Kaons and pions" date="1145957508" name="identification_alone.gif" path="identification_alone.gif" size="12358" user="GeorgSchepers" version="1.1"
Revision 6
24 Apr 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Line: 33 to 33
 

    • to this geometric contribution the resolution contribution (comming from the production and the transmission dispersion) has to be added which has a values of similar size

Deleted:
<
<
-- GeorgSchepers - 20 Apr 2006
 

Added:
>
>
  • Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.:
    Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad.
 

Added:
>
>

 

Added:
>
>
-- GeorgSchepers - 24 Apr 2006
 

META FILEATTACHMENT attr="" comment="Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls." date="1145454603" name="kkgamma.gif" path="kkgamma.gif" size="62874" user="GeorgSchepers" version="1.1"
Added:
>
>
META FILEATTACHMENT attr="" comment="Correlation of Cherencov angle Theta c as a function of laboratory momentum in the DIRC detector. The arrows mark a resolution of 10mrad." date="1145900207" name="cherenkov_angle_momentum_resolution.gif" path="cherenkov_angle_momentum_resolution.gif" size="5776" user="GeorgSchepers" version="1.1"
Revision 5
21 Apr 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Line: 29 to 29
 

  • Single Photon Cherenkov Angle Resulution
Changed:
<
<
    • with a DIRC-Bar size of 17x30x2000mm, a distance of l=1.20m of the photomultipiers from the bar exit and a diameter of the photomultiplier cathods of 2cm ( beeing equal to the distance of the centers of the cathods) the geometric contribution of the Single Photon Cherenkov Angle Resulution can be calculated
>
>
    • with a DIRC-Bar size of 17x30x2000mm, a distance of l=1.20m of the photomultipiers from the bar exit and a diameter of the photomultiplier cathods of 2cm ( beeing equal to the distance of the centers of the cathods) the geometric contribution of the Single Photon Cherenkov Angle Resulution can be calculated and lies in the order of magnitude of 10mrad
 

    • to this geometric contribution the resolution contribution (comming from the production and the transmission dispersion) has to be added which has a values of similar size

Revision 4
20 Apr 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Line: 25 to 25
 

Added:
>
>

FIRST Estimations:

  • Single Photon Cherenkov Angle Resulution

    • with a DIRC-Bar size of 17x30x2000mm, a distance of l=1.20m of the photomultipiers from the bar exit and a diameter of the photomultiplier cathods of 2cm ( beeing equal to the distance of the centers of the cathods) the geometric contribution of the Single Photon Cherenkov Angle Resulution can be calculated

    • to this geometric contribution the resolution contribution (comming from the production and the transmission dispersion) has to be added which has a values of similar size

-- GeorgSchepers - 20 Apr 2006
 

Revision 3
19 Apr 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"

Purpose

Added:
>
>
the DIRC provides

  • a positive kaon identification
  • a destinction of gammas and relativistic charged particles entering the EMC behind him
 

Working principle

Added:
>
>
  • Cherenkov Detector
  • determination of the mass of the particle by combining his velocity information with momentum information from the tracking detectors
 

Important values

Changed:
<
<
* Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls.:
>
>
  • Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls (Ref. TPR):
 

Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls.
Added:
>
>
  • the barrel DIRC covers the solid angle of 22 to 140 degrees
  • the lower momentum threshold for kaons which produce Cherenkov light is for an envisaged refractive index of n=1.47 as low as 460 MeV/c (for single photon producton -- for photon numbers bigger than 4 it is more than 200 MeV/c higher)
 

Changed:
<
<
-- CarstenSchwarz - 18 Apr 2006
>
>

 

Revision 2
19 Apr 2006 - Main.GeorgSchepers
Line: 1 to 1
 
META TOPICPARENT name="TasksandResults"
Added:
>
>

Purpose

Working principle

Important values

* Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls.:

Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls.

 

-- CarstenSchwarz - 18 Apr 2006
Deleted:
<
<

Purpose

Working principle

Implementation

Costs

 
Added:
>
>

META FILEATTACHMENT attr="" comment="Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls." date="1145454603" name="kkgamma.gif" path="kkgamma.gif" size="62874" user="GeorgSchepers" version="1.1"
 
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