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Test Beam Results of the CASTOR Forward Calorimeter - December 2008 Meeting

This report details the test beam results for the CASTOR forward calorimeter, presented at the CERN meeting on December 4, 2008. It covers the introduction of the CASTOR calorimeter, an analysis of the 2008 test beam, and includes discussions on pedestal stability, energy linearity, and resolution. Notably, the CASTOR calorimeter, which employs quartz and tungsten materials, plays a significant role in observing shower developments and exploring phenomena such as centauros and Higgs measurements. Results indicate a stable pedestal, linear calorimeter response, and a good energy resolution.

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Test Beam Results of the CASTOR Forward Calorimeter - December 2008 Meeting

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  1. 2008 Test Beam Results For CASTOR Semiray GIRGIS CUKUROVA UNIVERSITY CERNTR meeting December 4,2008

  2. 1- Introduction • The CASTOR forward calorimeter 2- The 2008 test beam analysis • Pedestal analysis • Energy scan • Surface scan 3 -Conclusions

  3. The CASTOR Forward Calorimeter

  4. Sampling calorimeter active material: quartz plates (Q) absorber material: tungsten plates (W) 16 semi-octants around the beam pipe Each semi-octant: 2 em and 12 hadronic channels (Readout Units (RU)) Castor Calorimeter

  5. CASTOR Calorimeter Total 224 channel Stage II Stage I

  6. We need CASTOR because of... To watch the shower development and investigate the nature of exotic objects like “ Centauros” To contribute Diffraction and low-x physics To support the Higgs measurements (higher acceptance of the CMS detector) Centauros are rare cosmic events with a very high hadronic fraction.

  7. We can measure particleswith CASTOR... Relativistic particles hit the detector They cause a cone of light (due to the Cherenkov effect) Light is collected and transported via light guides The signal is amplified with photomultipliers

  8. PEDESTAL STABILITY Prototypes –2008Test Beam Results

  9. Used run details

  10. Energy linearity and resolution with electron Prototypes – 2008 Test Beam Results

  11. The formula of energy resolution is;σ/E = a/(E) ½  + b/E + cWhere, Sigma (σ) shows bias at average energy, “E” is mean energy, “a” is for changes in number of primer particles,  “b” is noise term,  “c” symbolizes setting faults.

  12. For EM1+EM3+HAD1(sc,mv,had3) cut

  13. Beam profile 10GeV 200GeV

  14. For 48514 runs mv.cut For the muon veto cut I selected point between two peaks. s. s.

  15. Scintillator Cut 10GeV(48514 ) 20GeV(48582)

  16. Scintillator cut50GeV(48593) 200GeV(48655)

  17. For these runs fit (EMT+HAD1) 10GeV(48514) 50GeV(48593)

  18. After all cut Linearity&Resolutionσ/E = a/(E) ½  + b/E + c a= p1 ,b= p2 , c=p0 EMTotal+Had1 Linearty EMTotal+Had1 Resolution response Sigma/mean

  19. Energy linearity and resolution with pion Prototypes – 2008 Test Beam Results

  20. Used Run Details

  21. Linearity

  22. Resolution

  23. Surface scan with pion Prototypes – 2008 Test Beam Results

  24. 80GeV Pion beams were used for x-scan with pion Energy value of pion runs=80GeVY(mm)=0.0Events=50.000

  25. Beam profiles for run 48495 Figure a)Beam profile for run 48495 WOcut Figure b)Beam profile for run48495 WC(1mm) For the position scan runs with pions, the beam profile for each point was subdivided into a number

  26. Schematic Front View

  27. Mean responses and response derivatives (Saleve)‏ In TB07 note sigma:6.2mm pion @80 GeV

  28. Conclusions • Pedestals for each channel are stable. • The calorimeter response is found to be linear • The calorimeter shows a good energy resolution. • Hadronic shower width is found 6.7mm.

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