COMET Straw Gas Chamber M2 Hiroki Nakai 1 t n e - - PowerPoint PPT Presentation

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COMET Straw Gas Chamber M2 Hiroki Nakai 1 t n e - - PowerPoint PPT Presentation

Jan 17, 2023 496 likes •760 views

COMET Straw Gas Chamber M2 Hiroki Nakai 1 t n e m i r e p x E T E M O C Search for Muon to Electron Conversion at Pulsed Proton Beam a

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SLIDE 1

COMET実験のための Straw Gas Chamberの開発

久野研究室 M2 Hiroki Nakai 久野研山中研年末合同発表会

1

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SLIDE 2 Stopping Target Production Target

Pulsed Proton Beam

muon stopping target

ELECTRON TRACKER and calorimeter

electron transport

C O M E T E x p e r i m e n t

  • Search for Muon to Electron Conversion at

a sensitivity better than 10-16

The Detector

  • Muon Stopping Target
  • C-shape Electron Transport
  • Electron Detection

The Muon Source

  • Pion Production Target
  • Pion Capture Solenoid
  • C-shape Muon Transport

muon transport (curved solenoids)

2

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SLIDE 3

Why need Straw ?

Electron Tracker is placed in vacuum(Detector solenoid).

should withstand for vacuum

  • peration(pressure difference,etc...)

Sufficient energy resolution COMET requires better energy resolution than 1MeV

Momentum (MeV/c) 103 103.5 104 104.5 105 105.5 106 Counts per 0.05 MeV/c 0.05 0.1 0.15 0.2 0.25 Electron Momentum

3

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SLIDE 4

JP Straw chamber purposes

  • 1. Build (nearly) Full-Scale Prototype
  • approx. 1m length

wounded Mylar straw thickness of straw is 25µm

2.Test in Vacuum

✦

Establish the stable operation

✦

Checks, not only gas leak but also deformation

3.Integrate Relevant Items

✦

Front-end Electronics

✦

HV , Gas Controlling, Slow Control System, etc.

4

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SLIDE 5

Straw Chamber Design Work

Cross Section View

Gas Gas Gas HV

Straws

Schematic View Part of Drawing(Straw jig & Manifold Design)

The diameter of Mylar Straw is 5mm. Double plane (4tubes + 3tubes) 1single tube chamber, 2double plane chamber 1double plane chamber will be studied by glued each other With Large Gas-manifold to contain HV traces,readout front-ends

Top View Side View

5

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SLIDE 6

Straw Chamber

Gas Manifold General view

Straw Jig

6

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SLIDE 7

Gas leak Study First, studied by pressurized 2 atm in air Second, studied by measuring pressure build-up in vacuum Deformation Study Small deformation was measured by capacitive sensors as a function of position along wire

Study Items

AG

e sensor

Contrinex AG

capacitive sensor

7

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SLIDE 8

Gas Leak Study

2 atm Operation Vacuum Operation

y"="0.4458x"+"11.887 y"="0.0231x"+"8.2014 0.0"" 20.0"" 40.0"" 60.0"" 80.0"" 100.0"" 120.0"" 140.0"" 160.0"" 180.0"" 0" 100" 200" 300" 400" 500" 600"

Duration[min.] Vacuum Rate[Pa.]

Duration[sec.] 130001400015000160001700018000190002000021000 Pressure[Pa] 199 199.5 200 200.5 201 201.5 202 3 10 × / ndf 2
  • 3.579 / 164
Prob 1 p0 93.27 ± 2.025e+05 p1 0.005403 ±
  • 0.1473
/ ndf 2
  • 3.579 / 164
Prob 1 p0 93.27 ± 2.025e+05 p1 0.005403 ±
  • 0.1473

Graph_Build

Duration[min.]

2 atm Operation

~0.6199cc/min.

Vacuum Operation

~0.2267cc/min.

Gas Leak Study (Preliminary)

not consistent...

with Ar Gas Non-Gas

8

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SLIDE 9

Straw Deformation

2 atm Operation

~60µm (at 1/4 straw ) ~140µm (at 1/2 straw )

Vacuum Operation(Vacuum rate : 6.32 Pa)

~37µm (at 1/4 straw) ~67µm (at 1/2 straw)

From My calculation, deformation is ~8µm

Deformation Study (Preliminary)

Pressure[hPa] 1500 1600 1700 1800 1900 2000 Deformation[um] 40 60 80 100 120 140 / ndf 2
  • 0.9228 / 2
Prob 0.6304 p0 3.063 ±
  • 60.46
p1 0.001644 ± 0.05909

Pressure Opreration

/ ndf 2
  • 3.667 / 2
Prob 0.1598 p0 6.106 ±
  • 146
p1 0.003277 ± 0.1355 / ndf 2
  • 3.667 / 2
Prob 0.1598 p0 6.106 ±
  • 146
p1 0.003277 ± 0.1355 Vacuum_Rate[Pa] 6 6.5 7 7.5 8 8.5 9 9.5 10 Deformation[um] 20 25 30 35 40 45 50 55 60 65 70 / ndf 2
  • 0.24 / 1
Prob 0.6242 p0 1.382 ± 56.74 p1 0.1749 ±
  • 3.119
/ ndf 2
  • 1.906 / 1
Prob 0.1675 p0 3.895 ± 83.47 p1 0.4928 ±
  • 2.731

Vacuum Operation

Any result is not consistent...

9

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SLIDE 10

Chamber Signal

Raw signal is very good S/N Raw signal level is ~8mV QDC&TDC data is being acquiring with B-ray Source(Sr90). QDC shows reasonable landau distribution. TDC shows drift time distribution. in order to investigate the intrinsic position resolution, X-T relation will be extracted from data.

Raw Signal

htdc20 Entries 1385 Mean 4.904e+04 RMS 1.066e+04 Underflow Overflow Integral 1385 20 40 60 80 100 120 140 3 10 × 1 2 3 4 5 6 7 htdc20 Entries 1385 Mean 4.904e+04 RMS 1.066e+04 Underflow Overflow Integral 1385 htdc20 hqdc23 Entries 1612 Mean 510.8 RMS 189.5 Underflow 0 Overflow Integral 1612 500 1000 1500 2000 2500 3000 3500 4000 2 4 6 8 10 12 14 16 18 20 22 hqdc23 Entries 1612 Mean 510.8 RMS 189.5 Underflow 0 Overflow Integral 1612 hqdc23

QDC(very preliminary)

TDC(very preliminary)

DAQ Raw Signal

10 psec

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SLIDE 11

Test in Vacuum(progressing)

Need to operate straw chamber in Vacuum chamber.

Gas Leak needs to be measured again with N2 gas for Pirani- gauge calibration. Deformation needs to be Corrected , because sensors were leaning. Deformation needs to be measure at another Vacuum rate.

Need to another study In order to reduce deformation and gas leakage, gluing study between straws will be done, etc... Analysis about straw chamber for COMET operation.

11

A f t e r t h i s

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SLIDE 12

SUMMRY

COMET is aiming a sensitivity better than 10-16 Built full scale prototype of COMET straw gas chamber

  • approx. 1m length,

straw is 25µm thickness,5mm in diameter

Test in Vacuum(progressing)

Measured deformation.

~140µm at 2 atm operation,~67µm at Vacuum operation

Gas Leak is measured.

0.6199cc/min. at 2 atm operation, 0.2267cc/min. at Vacuum

  • peration

Pressure study is not consistent with vacuum operation... The Straw Chamber can be operated in the air. This R&D is just started, More studies will be done!

12

Merry Chrsmas!!!

@KEK...

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SLIDE 13

THE END of SLIDES

13

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SLIDE 14

Back up Slides

14

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SLIDE 15

Capacitive Sensor 時間変化

2.724% 2.726% 2.728% 2.73% 2.732% 2.734% 2.736% 2.738% 0% 50% 100% 150% 200% 250% 300% 350% 400% 1%

15

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SLIDE 16

Straw Chamber Design Work

Cross Section View

Gas Gas Gas HV

Straws

Schematic View Part of Drawing(progressing) Manifold Design(progressing)

✦

Status:Almost Finished

✦

Double plane(4tubes + 3tubes)

✦

1single tube chamber,2double plane chamber

✦

1double plane chamber will be studied by glued each other

✦

With Large Gas-manifold to contain HV traces,readout front-ends

Side View Top View

16

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SLIDE 17

To Do Lists

Straw Chamber

Chamber Construction

Vacuum Chamber Gas Control System Front-end Electronics Trigger Data Acquisition System Study Tools Capacitive Sensor study 2atm Operation study

17

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SLIDE 18

Capacitive Sensor Calibration

Calibration In Air Calibrate with M6 Cap +1cm×1cm Alumi tape In Chamber&Vacuum Calibrated Result Repeat Accuracy is not so good Use only slope

0.0000## 2.0000## 4.0000## 6.0000## 8.0000## 10.0000## 12.0000## 0# 1# 2# 3# 4# 5# 1# 2#
  • Vacuum#
0.0000## 2.0000## 4.0000## 6.0000## 8.0000## 10.0000## 12.0000## 0.0## 1.0## 2.0## 3.0## 4.0## 5.0## M6 +1cmAlmi# 1 M6 +1cmAlmi# 2 M6 +1cmAlmi# 3 M6 +1cmAlmi# 4 M6 +1cmAlmi# 5 M6 +1cmAlmi# 6

18

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SLIDE 19

Capacitive Sensor Calibration

Calibration In Air Calibrate with1cm×1cm Alumi tape Result Repeat Accuracy is not so good Use only slope

  • Distance[mm]
2.6 2.8 3 3.2 3.4 Voltage[V] 4.5 5 5.5 6 6.5 7 7.5 / ndf 2
  • 6.028 / 9
Prob 0.7372 p0 0.1604 ±
  • 2.083
p1 0.04766 ± 2.708 / ndf 2
  • 6.028 / 9
Prob 0.7372 p0 0.1604 ±
  • 2.083
p1 0.04766 ± 2.708 Medianfit

19

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SLIDE 20

Vacuum Chamber

Status:Ready

2m length in order to contain full-size prototype (1m tube with ~20m manifold on both ends) the degree of Vacuum is 6.7pa(with nothing included in chamber) Build up test is done.

20

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SLIDE 21

Trigger

Status:Under Consideration Basically, we may use scintillation counter for RI sources and cosmic rays... just usual way.... Pencil Trigger counter is readied. Tested in Vacuum chamber.

21

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SLIDE 22

Vacuum Operation

Detectors is placed in vacuum.

22

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SLIDE 23

Data Acquisition System

Status:Will be finished soon

VME;TDC + ADC(minimum set) Modified CAEN sample codes with CAEN’s APIs.

23

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SLIDE 24

Roesti project(Tatsuya Part)

(Read-Out Electronics for Straw Tube Instrument)

For offline analysis...

Waveform sampling enables to deal with pile up and to get better time resolution.

For operation in vacuum...

Low power consumption Reduce number of feedthrough by using an RJ45 connector .

150mm

110mm

Ethernet

FPGA

ADC ADC DRS DRS ASD ASD

Signal

Front-end Waveform Digitizer FPGA Ethernet

Signal

Data Suppress Data Transfer Wave sampling I-V transition Form waveform

Low noise Low power

High speed data transfer Good Point 24