1. Study of the Tail Catcher Muon Tracker (TCMT) Scintillator Strips and Leakage with Simulated Coil
Rick Salcido
Northern Illinois University
For CALICE Collaboration
LCWS08 Nov 17, 2008 UIC, Chicago

2. Introduction CALICE Detector Basics Attenuation of Scintillator Strips
Crosstalk of Scintillator
The effect of TCMT and coil on leakage was studied
Used a subset of TCMT layers, leaving a gap equivalent to 1.5 lambda to simulate magnetic coil
CALICE Detector Basics -- CALICE Test Beam Setup (note that there is another CALICE speaker just ahead of you so may not need to go into great detail on this)
--- Attenuation in Scintillator Strips
--- Crosstalk between strips
 Effect of ‘coil’ and TCMT on energy reconstruction
---- remove this point

3. Portions of this slide thanks to Erika Garutti and R. Pöschl
CERN Test Beam
Portions of this slide thanks to
Erika Garutti and R. Pöschl
H6 Beam Line
TCMT
HCAL
ECAL

4. CALICE Configuration, Oct. 2006
AHCAL:
Active layers in yellow, absorber in gray, missing layer in white
17 active layers with 2cm absorber
12 absorber layers with active layer every other absorber
TCMT:
Active layers in gray, absorber in blue
First layer assigned last two 2cm absorber layers of AHCAL
8 layers with 2cm absorber
7 layers with 10cm absorber
ECAL HCAL TCMT
1λ λ λ

5. TCMT Cassettes
Out of place

6. Crosstalk: Real Data Trigger Requirements Profile Plots
6 of 8 parallel strips have hits (hit = >0.5 mips)
No double muons
No pion showers
For Crosstalk histograms, central strip has > 0.8 mips
Profile Plots
When muon track found, profile plots booked to show the energy deposited in neighboring strips during the same event
640 unique plots (in practice, exclude dead strips  582 plots)
Total plots created by combining data for all strips
Slope of profile plots taken to measure correlation
Find slope of ‘total’ plots (data from all strips at once)
It should be noted that there was no delta-ray subtraction
Get rid of Real Data
Get rid of ‘640 unique….’

7. Crosstalk Results Mean slope = 5.22% Mean intercept = 7.76x10^-3
Get rid of the intercept
Mean slope = 5.22%
Mean intercept = 7.76x10^-3

8. Strip Attenuation Strips are divided into 20 ‘regions’
Used adjacent cassette as trigger
Applied proper cuts (no doubles, no pions, no electrons, only muons), similar to Crosstalk Analysis
Gaussian fits applied and MPV used
Plot MIP energy as a function of region
Fig. Belongs here
The ‘adjacent cassette as trigger’ needs to be explained better

9. Attenuation: MIP value vs Region

10. Coil Simulation and Leakage
Analysis done by Kurt Francis for PhD Thesis Research
remove

11. CALICE Configuration, Oct. 2006
ECAL HCAL TCMT
1λ λ λ
Slide repeated
Would like to compare Energy Resolution of :
ECAL + HCAL + n TCMT Layers
With:
ECAL + HCAL + n TCMT Layers λ gap + remaining layers of TCMT
Note: Weight of first layer after gap is adjusted

12. Allocation of TCMT Layers
Layers of TCMT
added to calorimeter
End of simulated coil/
first layer of tailcatcher
TCMT layers used
behind coil 10 7 1 2 11 6 3 4 5 12 8 9 13 14 15 16
1.5λ coil
First Layer of TailCatcher
(weight adjusted) (Layer 11 in this example. Seven remaining layers form tail catcher.)
N layers added to ECAL+HCAL
(two layers in this example)

13. Event Selection ECAL vs HCAL Region 1 - MIPs
Region 2 - pions traverse ECAL without showering
Region 3 - Anti-correlation region, pions shower in e-cal
remove

14. Analog Energy Response – -20 Gev pion run
CALICE
preliminary

15. Effects of Full TCMT Residual Cut
PRELIMINARY
After all cuts the configuration with no TCMT - a low left side tail still remains this is due to leakage from the HCAL
After including Full TCMT residual cut we
have a Clean pion spectrum

16. 20 GeV pi- PRELIMINARY RED: ECAL + HCAL + n TCMT Layers
BLUE: ECAL + HCAL + n TCMT Layers λ coil + remaining layers of TCMT

17. Effects of Beam Momentum
on Energy Resolution
PRELIMINARY
The title should just say ‘single particle resolution’

18. Effects of Beam Momentum on Energy Resolution (cont.)
PRELIMINARY
ditto

19. Summary
Attenuation of the optical signal per 1m of fiber was found to be approximately 10-15%
Strip Crosstalk approximately 5%
Adding remaining TCMT layers after a simulated coil of 1.5λ improves energy resolution and contains leakage
At a depth of 5.5 λ , the TCMT improves energy resolution by 2.2%, a relative improvement of 11%.

20. Special Thanks Kurt Francis Nina Scurti Steve Boona
PhD Research and Detailed TCMT Coil Analysis
Nina Scurti
Attenuation Analysis
Steve Boona
Cross Talk Analysis
Vishnu Zutshi, Guilherme Lima, Dave Hedin, Sasha Dyshkant
remove