An Analy alysis is of of CD CDC C cos osmic ic-ra ray test - - PowerPoint PPT Presentation

▶
an analy alysis is of of cd cdc c cos osmic ic ra ray test
SMART_READER_LITE
LIVE PREVIEW

An Analy alysis is of of CD CDC C cos osmic ic-ra ray test - - PowerPoint PPT Presentation

Mar 08, 2024 292 likes •542 views

An Analy alysis is of of CD CDC C cos osmic ic-ra ray test 2017.12.28 Year End presentation Kuno Lab M2 Kaori Okinaka 2017/12/28 year end presentation 1 Over view ks 1. Introduction COMET experiment COMET CDC

slide-1
SLIDE 1

An Analy alysis is of

  • f

CD CDC C cos

  • smic

ic-ra ray test

2017.12.28 Year End presentation Kuno Lab M2 Kaori Okinaka

1 2017/12/28 year end presentation

slide-2
SLIDE 2

ks

  • 1. Introduction
  • 2. XTCurve (relation between drift Time and drift distance)
  • 3. Spatial resolution
  • 4. Hit efficiency
  • 5. Summary

2

Over view

  • COMET experiment
  • COMET CDC
  • Cosmic ray test

2017/12/28 year end presentation

slide-3
SLIDE 3

COMET is experiment to detect ! → # conversion which is

  • ne of the charged lepton flavor violation(=CLFV).

We target to achieve signal sensitivity 3×10)*+ for Phase-I.

3

COMET Phase-I

uStandard model (! → #,) BR: ~10)+. uNew Physics BR: ~10)*+ We use Cylindrical Drift Chamber (CDC) for COMET Phase-I to detect signal of ! → # conversion

Search for new physics beyond standard model

2017/12/28 year end presentation

slide-4
SLIDE 4

4

COMET CDC

Sense wire Field wire

Material : Au plated W # of wires: 4986 diameter of wire: 25!m material: Al # of wires: 14562 Diameter of wire: 126!m Size for cell of CDC

requirement for COMET CDC

  • Momentum resolution< 200keV/c

(for electron of 105MeV/c)

  • Spatial resolution < 200µm

signal BG

!)/ → #)/ ( )) )

Ground +HV

8mm 8.4mm

Number of layer is 20 (include 2 guard layers)

2017/12/28 year end presentation

Gas ratio He:i-C4H10 =90:10 magnetic field 1T All stereo wire

COMET CDC 1.7m Gas Chamber

+HV

e

Ground

slide-5
SLIDE 5

Now we are checking performance for CDC by Cosmic ray test in KEK. 5

Cosmic ray test

<setup for cosmic ray test> Applied HV 1750~1850V gas ratio He:i-C4H10 90:10 (flow rate:90 CCM:10 CCM)

2017/12/28 year end presentation Setup (view from center plane of CDC)

<information from CDC> TDC : timing information ADC : charge information

requirement for CDC momentum resolution200keV/c

  • 1. Create XT for COMET CDC
  • 2. Check spatial resolution
  • 3. Check hit efficiency

I estimate these points.

Track example viewed from center plane of CDC

[mm] [mm]

O

*Mainly data applied 1825V is used for detail analysis

slide-6
SLIDE 6

6

Analysis

2017/12/28 year end presentation

I estimate for XT, spatial resolution and hit efficiency for each cell and each incident angle. I estimated event which meets requirement for events.

I get σ of residual to understand spatial resolution. Spatial resolution

XTCurve

XT curve corresponds to the relation between drift distance and drift time for CDC. Because every cell has vary shape, XT relation is different for each cell.

Residual =radius of drift circle – |DCA|

DCA =Distance of Closest Approach

G P value for tracking>0.05 # of layers which has single hit >14 # of layers which has multi hits<2

Requirements for event

<Hit condition for XT Curve>

  • Hit on the test layer
  • P value of tracking>0.05
  • residual
  • 0.5mm~0.5mm

!"#$%&' is switch timing for fitting function. This value is got by fitting. Fitting function for XT

residual[mm] 2 − 1.5 − 1 − 0.5 − 0.5 1 1.5 2 entry 100 200 300 400 500 600 700 800 900

residual(DCA5~6mm) iteration3 residual(DCA5~6mm) iteration3

=>?@ABCDE＝spatial resolution＋Tracking error

1 2 3 4 5 6 XT Curve for testlayer 10 driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 XT Curve for testlayer 10
slide-7
SLIDE 7

ß

2017/12/28 year end presentation

7

F dependence for XT

Definition of angle F Phi is incident angle of track for cell.

The electric field is different between around center of cell and edge of cell. So, XT Curves are also different depends on incident angle. I checked XT difference from checking F dependence for XT

Ground

+HV

!

degree 40 − 30 − 20 − 10 − 10 20 30 40 entry/bin

2000 4000 6000 8000 10000 12000 14000 16000 18000 20000

distribution φ Cell_ distribution φ Cell_

Electric field simulated by garfield

Readout area is left side of CDC and cell lean to right. So, F distribution lean to positive value.

SETUP

positive

F

X’ Y’

slide-8
SLIDE 8

2017/12/28 year end presentation

8

F dependence for XT

slope of XT is more steep angle when |F| is larger . It means drift velocity is faster for large F . Its consistent with electric field studied by simulation. This is XT curve corresponds to the relation between drift distance and drift time.

Preliminaly

slide-9
SLIDE 9

ß

2017/12/28 year end presentation

12

Spatial resolution -HV dependence-

layer 2 4 6 8 10 12 14 16 18 sigma[mm] 0.15 0.2 0.25 0.3 0.35 0.4 spatial resolution for each layer

run175 @1850V run171 @1825V run161 @1800V run183 @1775V run181 @1750V

spatial resolution for each layer

G P value for tracking>0.05 # of layers which has single hit >14 # of layers which has multi hits<2

Requirements for event =>?@ABCDE＝spatial resolution＋Tracking error

σ value is large around guard layer. Its because tracking error is bigger than middle layer.

I estimated spatial resolution for each layers from σ of residual . The data which applied 1800V~ meets requirement of spatial resolution (=>?@ABCDE<200µm)

required

slide-10
SLIDE 10

ß

2017/12/28 year end presentation

13

Hit efficiency -HV dependence-

layer 2 4 6 8 10 12 14 16 18 Hit efficiency 0.75 0.8 0.85 0.9 0.95 1

Hit efficiency per layer

run175 @1850V run171 @1825V run161 @1800V run183 @1775V run181 @1750V

Hit efficiency per layer

STUV#W XY #Z#S[ \ℎ^_ℎ ℎ`a ℎ^[ (residual < Q=) number of events meet the requirements Hit efficiency =

G P value for tracking>0.05 # of layers which has single hit >14 # of layers which has multi hits<2

Requirements for event

I estimated hit efficiency for each layers. The data which applied 1800V~ reached about 95% for hit efficiency. From this value and tracking efficiency, we are going to set the definition of hit which use for tracking.

slide-11
SLIDE 11

14

Summary

2017/12/28 year end presentation

  • COMET is experiment to detect ! → # conversion .
  • We are checking performance for CDC which detect mu-e conversion in COMET

Phase-I.

  • I estimated XT , spatial resolution, hit efficiency.
  • I checked that there is F dependence for XT.
  • H×F dependence is also seen by difference of XT.
  • I can check HV dependency for hit efficiency and spatial resolution.

When applied HV is over 1800V, spatial resolution meets the conditions for

  • CDC. (CDC requirement : spatial resolution < 200µm)

The data which applied higher than 1800V reached about 95% for hit efficiency.

  • > from these result , we are going to set the definition of hit for tracking ,

applied HV.

slide-12
SLIDE 12

Back up

15

2017/12/28 year end presentation

slide-13
SLIDE 13

ß

2017/12/28 year end presentation

16

F dependence for XT

driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 h_XTp0 Entries 4280 Mean x 174 Mean y 3.999 RMS x 139.3 RMS y 2.418 10 20 30 40 50 60 70 80 90 100 h_XTp0 Entries 4280 Mean x 174 Mean y 3.999 RMS x 139.3 RMS y 2.418 ~-7.5 degree φ XT Curve for driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 h_XTp1 Entries 59927 Mean x 173.9 Mean y 4.025 RMS x 133.4 RMS y 2.363 10 20 30 40 50 60 70 80 90 100 h_XTp1 Entries 59927 Mean x 173.9 Mean y 4.025 RMS x 133.4 RMS y 2.363
  • 7.5~-2.5 degree
φ XT Curve for driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 h_XTp2 Entries 303009 Mean x 176.6 Mean y 4.072 RMS x 134.2 RMS y 2.38 10 20 30 40 50 60 70 80 90 100 h_XTp2 Entries 303009 Mean x 176.6 Mean y 4.072 RMS x 134.2 RMS y 2.38
  • 2.5~2.5 degree
φ XT Curve for driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 h_XTp3 Entries 464826 Mean x 190 Mean y 4.263 RMS x 145.7 RMS y 2.441 10 20 30 40 50 60 70 80 90 100 h_XTp3 Entries 464826 Mean x 190 Mean y 4.263 RMS x 145.7 RMS y 2.441 2.5~7.5 degree φ XT Curve for driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 h_XTp4 Entries 353371 Mean x 199.6 Mean y 4.414 RMS x 150.2 RMS y 2.429 10 20 30 40 50 60 70 80 90 100 h_XTp4 Entries 353371 Mean x 199.6 Mean y 4.414 RMS x 150.2 RMS y 2.429 7.5~12.5 degree φ XT Curve for driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 h_XTp5 Entries 131501 Mean x 203.2 Mean y 4.513 RMS x 144.7 RMS y 2.315 10 20 30 40 50 60 70 80 90 100 h_XTp5 Entries 131501 Mean x 203.2 Mean y 4.513 RMS x 144.7 RMS y 2.315 12.5~17.5 degree φ XT Curve for driftTime [ns] 100 200 300 400 500 600 700 DCA [mm] 10 − 8 − 6 − 4 − 2 − 2 4 6 8 10 h_XTp6 Entries 20914 Mean x 202.1 Mean y 4.458 RMS x 148 RMS y 2.345 10 20 30 40 50 60 70 80 90 100 h_XTp6 Entries 20914 Mean x 202.1 Mean y 4.458 RMS x 148 RMS y 2.345 17.5~22.5 degree φ XT Curve for
slide-14
SLIDE 14

ß

2017/12/28 year end presentation

9

H×F dependence for XT

This is the example of cell shape. Each cells have different H value. The electric field is varies from H value especially for edge of cell. I checked H× F dependence for XT.

I

Cell shape image

I I I I = KL° I = NO° I = PQL°

Example…

slide-15
SLIDE 15

ß

2017/12/28 year end presentation

10

H×F dependence

I

Vertical track

The initial electron of vertical track comes from horizontal direction of cell. So, these tracks are not affected by H value.

Preliminaly

slide-16
SLIDE 16

2017/12/28 year end presentation

11

H×F dependence

I

Oblique track

The initial electron generated by oblique track comes from corners of cell. So, these tracks are affected by H value.

Preliminaly

slide-17
SLIDE 17

ß

2017/12/28 year end presentation

17

H×F dependence

I

driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15

17.5~22.5 φ XT Curve for

= 55~65 β XT for = 65~75 β XT for = 75~85 β XT for = 85~95 β XT for = 95~105 β XT for =105~115 β XT for =115~125 β XT for
slide-18
SLIDE 18

ß

2017/12/28 year end presentation

18

H×F dependence for XT

driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for driftTime[ns] 100 200 300 400 500 600 700 DCA[mm] 15 − 10 − 5 − 5 10 15 17.5~22.5 φ XT Curve for = 60~70 for β XT for = 70~80 for β XT for = 80~90 for β XT for = 90~100 for β XT for =100~110 for β XT for =110~120 for β XT for
slide-19
SLIDE 19

ß

2017/12/28 year end presentation

19

H×F dependence for XT

slide-20
SLIDE 20

ß

2017/12/28 year end presentation

20

Spatial resolution -DCA dependent-

There are mainly 4 reason for σ value 1. Ionization particle 2. Diffusion of particles in gas 3. Time resolution 4. Tracking error We can fit DCA vs σ by this estimation.

ijkjlmn = iokpn + irn + ismn + ijtluvn

  • C. Avanzini et al. / Nuclear Instruments and Methods

in Physics Research A 449 (2000) 237~247

DCA[mm] 1 2 3 4 5 6 7 8 9 sigma of residual [mm] 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4

|DCA| vs sigma |DCA| vs sigma

slide-21
SLIDE 21

6i

ß

2017/12/28 year end presentation

21

Hit efficiency

DBIB

  • a. Estimation for 3 sigma

7i 3i

  • b. Estimation for 7sigma for the

hit which DCA is 0~1mm

Hit efficiency for DCA0~1mm a b

Ave 95.5% Ave 96.5%

Hit efficiency for all DCA range Ave 89.9% Ave 97.7%

About 1% improved

a b

About 8% improved

Last year result

slide-22
SLIDE 22

2017/12/28 year end presentation

22

Ionization particles

  • Electron ion pairs are generated when charged particle through the cells.
  • The number of generated electron ion pair is decided by ionization energy and

energy deposit . And this values are corresponds to type of gas.

  • We use He:i-C4H10 (90:10), and number of generated electron ion pair is 14/cm .

xy: radiation length {: mean energy to generate

  • ne electron-ion pair

Table: nature of type of mixed gas COMET Belle

r| r} ∶ energy deposit for MIP

S

ÄÅÇ: number of electron-ion pair for MIP

SÉ

ÄÅÇ:number of primary ion pair for MIP

slide-23
SLIDE 23

layer

2 4 6 8 10 12 14 16 18

Hit efficiency

0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1

efficiency per layer for iteration3 efficiency per layer for iteration3

ß

2017/9/26 COMET CM23

23

Study of hit efficiency

I estimated 5σ efficiency

Ave 95.5%

Hit efficiency for each layer

Ave 98.4%

STUV#W XY #Z#S[ \ℎ^_ℎ ℎ`a ℎ^[ (residual < L=) number of events meet the requirements Hit efficiency =

(residual<3σ) (residual<5σ)