CASTOR Detector Study.

Motivation

  • Flow effect could be detected in high eta regin, eta < -5 at CASTOR detector.
  • Run Number : 151027
  • Centrality Cut : 0 ~ 60%

CASTOR detector performance.

  • From 17 November 2010 CMS General Weekly Meeting, CERN, "Status and prospects of the CASTOR calorimeter", page 7.
    • Mod. 7 and Mod. 8 had been broken by the magnetic field.
  • For aquiring a flow signal, the sectors were merged along the module.

Energy and Hit Distribution.

  • The hit distribution was filled same value, 65649, but the energy distribution was not symmetry.
  • A number flow, dN/d(phi-psi2) could not be counted, then a new hit definition was needed.

Castor Hit Distribution Module by Sector Castor Energy Distribution Module by Sector
fig-1_2D_Dist_0.gif fig-1_2D_Dist_1.gif

Merged Module.

  • As you can see the Merged each module plots, a number of 60 GeV hit energy was regarded background.
  • Then, the hit definition is determined to cut 0 ~ 60 GeV.

  Sector 1 Sector 2 Sector 3 Sector 4
Merged each module fresh_melon0.gif fresh_melon1.gif fresh_melon2.gif fresh_melon3.gif

  Sector 5 Sector 6 Sector 7 Sector 8
Merged each module fresh_melon4.gif fresh_melon5.gif fresh_melon6.gif fresh_melon7.gif

  Sector 9 Sector 10 Sector 11 Sector 12
Merged each module fresh_melon8.gif fresh_melon9.gif fresh_melon10.gif fresh_melon11.gif

  Sector 13 Sector 14 Sector 15 Sector 16
Merged each module fresh_melon12.gif fresh_melon13.gif fresh_melon14.gif fresh_melon15.gif

Track Event Plane.

fig-6_Before_After_Wegiht.gif fig-12_phipsi2.gif
A Blue line is number of track by track phi without detector weighting. After weighting, dN/Phi distributions are flating. As you can see the blue line, dN/dPsi was tilted to 90 degree. After weighting, the red line has still little fluctuation but not tillted.

Elliptic Flow in CASTOR except Mod.6, Mod.7, Mod.8 and Mod.9.

  • From 2D module-sector energy distribution, the module 6 to 9 energy distribution was not symmetry because magnetic effect.
  • The Mod.10-Sec.5, Mod.12-Sec.7 and Mod.13-Sec.13 are much lower than other sectors in each module.
  • That parts are corrected to multiply by 10/9 ratio.

kimchi1.gif kimchi2.gif
Little fluctuation but not tilted. Almost hits are symmetric over phi. It shows that energy distiribution over phi is symmetric with new hit definition, 0~60 GeV

kimchi3.gif kimchi4.gif
dN/d(phi-psi) looks flat but has cosine fluctuation. As looking 0 and Pi, a TRACKER and CASTOR are showing similar event plane in energy scale.

persimmon_1.gif persimmon_2.gif
Measured v2 without track correction. It shows oppositing ordinary flow shape. The v2 value is too high. It needs correction.

Corrected v2

  • Track v2 resolution
  • Seperated two part in eta regin, -2.0 ~ 2.0, to -2.0 ~ -0.4 and 0.4 ~ 2.0.

plum_Before_After_Wegiht.gif sale_plum.gif
dN/dPhi track weighting in eta regin -2.0<eta<-0.4. This plot is TRACKER minus eta regin track dN/d(phi-psi)

papaya_Before_After_Wegiht.gif sale_papaya.gif
dN/dPhi track weighting in eta regin 0.4<eta<2.0. This plot is TRACKER plus eta regin track dN/d(phi-psi).

v2 resolution resolution_cent.gif
v2_castor0.gif v2_castor1.gif

Summary

Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif fig-12_phipsi2.gif r3 r2 r1 manage 5.8 K 2011-01-24 - 10:57 UnknownUser  
GIFgif fig-1_2D_Dist_0.gif r2 r1 manage 4.5 K 2011-01-24 - 10:27 UnknownUser  
GIFgif fig-1_2D_Dist_1.gif r2 r1 manage 7.8 K 2011-01-24 - 10:28 UnknownUser  
GIFgif fig-6_Before_After_Wegiht.gif r2 r1 manage 16.4 K 2011-01-24 - 10:48 UnknownUser  
GIFgif fresh_melon0.gif r2 r1 manage 2.2 K 2011-01-23 - 20:46 UnknownUser  
GIFgif fresh_melon1.gif r2 r1 manage 2.1 K 2011-01-23 - 20:46 UnknownUser  
GIFgif fresh_melon10.gif r2 r1 manage 2.1 K 2011-01-23 - 20:48 UnknownUser  
GIFgif fresh_melon11.gif r2 r1 manage 2.4 K 2011-01-23 - 20:48 UnknownUser  
GIFgif fresh_melon12.gif r2 r1 manage 2.2 K 2011-01-23 - 20:48 UnknownUser  
GIFgif fresh_melon13.gif r2 r1 manage 2.1 K 2011-01-23 - 20:48 UnknownUser  
GIFgif fresh_melon14.gif r2 r1 manage 2.5 K 2011-01-23 - 20:48 UnknownUser  
GIFgif fresh_melon15.gif r2 r1 manage 2.1 K 2011-01-23 - 20:49 UnknownUser  
GIFgif fresh_melon2.gif r2 r1 manage 2.1 K 2011-01-23 - 20:46 UnknownUser  
GIFgif fresh_melon3.gif r2 r1 manage 2.1 K 2011-01-23 - 20:46 UnknownUser  
GIFgif fresh_melon4.gif r2 r1 manage 2.1 K 2011-01-23 - 20:47 UnknownUser  
GIFgif fresh_melon5.gif r2 r1 manage 2.1 K 2011-01-23 - 20:47 UnknownUser  
GIFgif fresh_melon6.gif r2 r1 manage 2.1 K 2011-01-23 - 20:47 UnknownUser  
GIFgif fresh_melon7.gif r2 r1 manage 2.4 K 2011-01-23 - 20:47 UnknownUser  
GIFgif fresh_melon8.gif r2 r1 manage 2.1 K 2011-01-23 - 20:47 UnknownUser  
GIFgif fresh_melon9.gif r2 r1 manage 2.1 K 2011-01-23 - 20:48 UnknownUser  
GIFgif kimchi1.gif r2 r1 manage 3.6 K 2011-01-27 - 06:55 UnknownUser  
GIFgif kimchi2.gif r3 r2 r1 manage 4.0 K 2011-01-27 - 06:57 UnknownUser  
GIFgif kimchi3.gif r4 r3 r2 r1 manage 3.5 K 2011-01-27 - 06:55 UnknownUser  
GIFgif kimchi4.gif r5 r4 r3 r2 r1 manage 3.5 K 2011-01-27 - 06:58 UnknownUser  
GIFgif module_sector_0.gif r2 r1 manage 2.7 K 2011-01-23 - 20:09 UnknownUser  
GIFgif module_sector_1.gif r2 r1 manage 2.6 K 2011-01-23 - 20:10 UnknownUser  
GIFgif module_sector_10.gif r2 r1 manage 2.3 K 2011-01-23 - 20:12 UnknownUser  
GIFgif module_sector_11.gif r2 r1 manage 2.5 K 2011-01-23 - 20:12 UnknownUser  
GIFgif module_sector_12.gif r2 r1 manage 2.3 K 2011-01-23 - 20:12 UnknownUser  
GIFgif module_sector_13.gif r2 r1 manage 2.7 K 2011-01-23 - 20:12 UnknownUser  
GIFgif module_sector_14.gif r2 r1 manage 3.0 K 2011-01-23 - 20:12 UnknownUser  
GIFgif module_sector_15.gif r2 r1 manage 2.8 K 2011-01-23 - 20:12 UnknownUser  
GIFgif module_sector_2.gif r2 r1 manage 2.4 K 2011-01-23 - 20:10 UnknownUser  
GIFgif module_sector_3.gif r2 r1 manage 2.6 K 2011-01-23 - 20:10 UnknownUser  
GIFgif module_sector_4.gif r2 r1 manage 2.7 K 2011-01-23 - 20:10 UnknownUser  
GIFgif module_sector_5.gif r2 r1 manage 2.6 K 2011-01-23 - 20:13 UnknownUser  
GIFgif module_sector_6.gif r2 r1 manage 2.4 K 2011-01-23 - 20:13 UnknownUser  
GIFgif module_sector_7.gif r2 r1 manage 2.9 K 2011-01-23 - 20:11 UnknownUser  
GIFgif module_sector_8.gif r2 r1 manage 2.6 K 2011-01-23 - 20:11 UnknownUser  
GIFgif module_sector_9.gif r2 r1 manage 2.8 K 2011-01-23 - 20:11 UnknownUser  
GIFgif papaya_Before_After_Wegiht.gif r1 manage 14.5 K 2011-01-25 - 13:22 UnknownUser  
GIFgif persimmon_1.gif r3 r2 r1 manage 5.8 K 2011-01-26 - 09:54 UnknownUser  
GIFgif persimmon_2.gif r3 r2 r1 manage 5.7 K 2011-01-26 - 09:55 UnknownUser  
GIFgif plum_Before_After_Wegiht.gif r1 manage 15.3 K 2011-01-25 - 13:22 UnknownUser  
GIFgif resolution_cent.gif r4 r3 r2 r1 manage 4.3 K 2011-01-26 - 10:06 UnknownUser  
GIFgif sale_papaya.gif r3 r2 r1 manage 5.9 K 2011-01-26 - 10:03 UnknownUser  
GIFgif sale_plum.gif r3 r2 r1 manage 5.4 K 2011-01-26 - 10:03 UnknownUser  
GIFgif v2_castor0.gif r3 r2 r1 manage 5.1 K 2011-01-26 - 09:55 UnknownUser  
GIFgif v2_castor1.gif r3 r2 r1 manage 5.1 K 2011-01-27 - 06:56 UnknownUser  
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Topic revision: r11 - 2011-02-14 - HyunYongJo
 
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