status report tracking code
Download
Skip this Video
Download Presentation
Status report - Tracking code -

Loading in 2 Seconds...

play fullscreen
1 / 14

Status report - Tracking code - - PowerPoint PPT Presentation


  • 90 Views
  • Uploaded on

Status report - Tracking code -. T.Gogami 9/30/2010. Content. D ebug test point drift time Simulation for tracking efficiency e,e + background. T est point calculation in pattern recognition for HKS. Test point coordinate ( x , y ). y-coordinate sign is opposite !.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Status report - Tracking code -' - glyn


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
content
Content
  • Debug
    • test point
    • drift time
  • Simulation for tracking efficiency
  • e,e+ background
t est point calculation in pattern recognition for hks
Test point calculation in pattern recognition for HKS

Test point coordinate ( x , y )

y-coordinate sign is opposite !

http://lambda.phys.tohoku.ac.jp/~gogami/HES-HKS/testpoint/testpoint.pdf

But in current code

  • There is no affection to select space points.
  • But this affect in “h_tof_pre.f”.
  • (this case is so rare)
clusters in residual vs 2 distribution
Clusters in residual vs. χ2 distribution

Longer drift time events make clusters

x’ [rad]

Track χ2

x [cm]

Single residual (KDC1-3) [cm]

Drift time [ns]

h tof pre f
h_tof_pre.f
  • pre track with space points
    • single hit in KTOF
    • multi hit in KTOF
  • start time calculation for drift time of chambers
  • correction (card)
b ugs in h tof pre f
Bugs in h_tof_pre.f

start time for drift time

KTOF TDC information

  • single hit
  • multi hit (mean)
r esidual vs 2
Residual vs. χ2

CH2 target

Current

CH2 target

Current

Disappear clusters

New

CH2 target

New

16 %

for 52Cr target

40%

d rift distance x vs residual
Drift distancex’ vs. residual

CH2 target

Current

Current

Residual [cm] (KDC1-3)

Stripe

drift distance [cm]

x’ [rad] @ reference plane

New

New

Residual [cm] (KDC1-3)

drift distance [cm]

x’ [rad] @ reference plane

simulation for hks tracking efficiency by d doi
Simulation for HKS tracking efficiency (by D.Doi)

KTOF1X

  • input tracks in simulation

==> output file (hit wire info and so on)

  • input this file to real analyzer
  • see output tracks and compare to input tracks

K+

KDC2

KDC1

one result of this simulation

CH2 target

Current analyzer

cannot handle

with high multiplicity data

52Cr target

Need to improve

tracking code

Now developing

e e b g in hks
e,e+ b.g. in HKS

TOP view

5 × 5 [cm2]

Side view

HKS - D

HKS - Q

X’ [rad]

X [cm]

b g mix rate in hks trigger
B.G mix rate in HKS trigger

a

just after pattern recognition

==>cut bad combination of space point (like h_tof_pre)

==> Saving CPU power , Reduce analysis time

52Cr (77124)

b

12C (76077)

9Be (76607)

7Li (76184) .

10B (76184)

B.G. mix rate = a/(a+b)

×1044

Developing B.G. cut routine

multiplicity in chambers
Multiplicity in chambers

HES

layer

10

6

after TDC cut

52Cr target

CH2 target

mean ~ 1 hit

mean ~ 1 hit

~2 [MHz]

(8 [μA] on 52Cr)

HKS

after TDC cut

6

6

layer

52Cr target

CH2 target

mean ~ 6 hit

mean ~ 2 hit

~18 [kHz]

(8 [μA] on 52Cr)

Origin of high multiplicity is ee+ B.G. ?

summary and to do
Summary and to do
  • Summary
    • debug
      • test point calculation in “find space point”
        • opposite sign for y-coordinate of test point
      • ( finalminnum--> finalminnum+1 ) in “h_tof_pre.f”
        • drift time distribution got better
        • entry number is up (CH2:16% up , 52Cr:40% up)
    • Simulation for HKS tracking efficiency by D.Doi
    • e,e+ B.G
      • mix rate is high especially for 52Cr target.
        • need to cut before tracking
      • Origin of high multiplicity ?
  • to do
    • Development
      • reject e,e+ B.G routine
      • choose single hit routine --> see all combination
    • Check
      • HES side tracking code
      • e,e+ B.G origin ?
        • check ADC
        • Simulation
generated e in simulation
Generated e+ in Simulation

pe+ : 1.2±0.5 [GeV/c]

θ : 0.124±0.124 [rad]

φ : 2.64159±0.5 [rad]

target : 12C 100[mg/cm2]

HKS D magnet

HKS D magnet

Splitter magnet

beam:

spherical uniform generation

no collimator

EM flag on

ad