slide1
Download
Skip this Video
Download Presentation
R&D status of Scintillator

Loading in 2 Seconds...

play fullscreen
1 / 17

R&D status of Scintillator - PowerPoint PPT Presentation


  • 95 Views
  • Uploaded on

R&D status of Scintillator. 8 th ACFA Workshop Daegu, Korea. Youngdo Oh Kyungpook National University. Junsuk Suh, Youngdo Oh, Kihyun Cho, Donghee Kim : Kyungpook National University Intae Yu : SungKyunKwan Univesity Soobong Kim : Seoul National University. Current R&D Status.

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 'R&D status of Scintillator' - dustin-allen


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
slide1
R&D status of Scintillator

8th ACFA Workshop

Daegu, Korea

Youngdo Oh

Kyungpook National University

Junsuk Suh, Youngdo Oh, Kihyun Cho, Donghee Kim : Kyungpook National University

Intae Yu : SungKyunKwan Univesity

Soobong Kim : Seoul National University

slide2
Current R&D Status
    • At first, the pure polystyrene bar was produced without
  • PPO, POPOP
    • The mechanical process is established
    • 2. At second, PPO and POPOP were mixed up with polystyrene
    •  The 1st scintillator was produced.
    • 3. Light yield was measured and compared with reference
    • scintillator
slide3
Plastic Scintillator
  • Component: Polystyrene pellets + Dopants

(primary & secondary)

  • Dopants
    • Primary dopants (blue-emitting)
    • PT(p-Teraphenyl), PPO(2,5-biphenyloxazole)
    • 1-1.5% (by weight) concentration
    • Secondary dopants (green-emitting)
    • POPOP(1,4-bis(5-Phenyloxazole-2-yl)benzene),
    • bis-MSB(4-bis(2-Methylstyryl)benzene)

0.01-0.03%(by weight) concentration

  • Production : Extrusion

extrusion is easy to make thin scintillator

slide4
Plastic Scintillator – how does it work ?

Excitation of bas plastic by radiation

Base plastic

10-8 m

Foster energy transfer ( resonant dipole-dipole interaction)

PPO (~1%)

Emit UV ~340nm

10-4 m

photon

Absorb UV photon

POPOP(~0.05%)

Emit blue ~400nm

photon

Detector (PMT, photo diode …. )

slide5
Extrusion Process

All the work is done at one facility → reduces costs

By removing its exposure to another high temperature cycle → reduces hits history of the product

→ eliminates an additional chance for scintillator degradation

slide6
1.2 mm

2mm

1cm

4cm

Die and Materials

  • Die profile
  • Mixture of dopants

Polystyrene : 3 kg

PPO : 1.3 %

POPOP : 0.03%

slide7
First Batch from Misung chemical
  • At first, We try to produce polystyrene bar without PPO

and POPOP to make sure the chemical and mechanical

process.

  • TiO2 was coextruded to make reflector.
  • At 2005/5/17 , Misung launched extrusion for scintillator
  • The first product had big groove  die had minor problem
  • At 2005/6/9 , the excellent bars were produced.
  • At 2005/7/7, the 2nd bacth has PPO, POPOP.

Evolution

slide8
2nd Production
  • PPO and POPOP were mixed up
  • 110 cm bars were produced
  • We produced this batch in air
slide9
Comparision of transparency

Oxidation made the sample opaque

because of production in air.

Polysyrene

bar

Reference

samples

New samples

slide10
FAN

IN-OUT

Disc

Logic

unit

Gate

Generator

100 ns

Delay

VME

readout

Scintillator test setup

  • 5 reference samples and new samples with the same geometrical shape and size were used to compare light yield

Typical cosmic ray

From reference sample + WLS

slide12
Light Yield Measurement

Trigger : threshold = 100mV , Gate=150ns

New sample

New scintillator bars (5 samples)

= 236.8  25.1

Reference scintillator bars(5samples)

= 590.6 76.9

ADC counts

Reference sample

Relative Light Yield of new samples

shows 40.1% of reference samples

ADC counts

slide13
Light Yield Measurement

Trigger : random trigger (1000Hz) , Gate=150ns (amplifier used : x100 )

New sample

New scintillator bars (5 samples)

= 225.9  24.9

Reference scintillator bars(5 samples)

= 534.8 56.9

ADC counts

Reference sample

Relative Light Yield of new samples

shows 42.3% of reference samples

ADC counts

slide14
Light Yield Measurement

Trigger : random trigger (1000Hz) , Gate = 2 s

(amplifier not used)

New sample

New scintillator bars (5 samples)

= 26.5  3.5

Reference scintillator bars(5 samples)

= 79.1  8.4

ADC counts

Reference sample

Relative Light Yield of new samples

shows 33.5% of reference samples

ADC counts

slide15
Reference samples

Average = 4.35

RMS = 0.39

A

New samples

Average = 1.59

RMS = 0.18

Sample ID

Light Yield Measurement

Pico ammeter is used

Relative Light Yield of new samples shows 36.6% of reference samples’ one.

slide16
A

A

cm

cm

Light Yield Measurement

Refernce sample

New sample

slide17
Summary and Plan
  • First Polystyrene bar produced with PPO and POPOP

 The mechanical process is established

  • Light yield measued for new and reference samples

 new sample shows ~40% light yield of reference sample

 low light yield because of oxidation in air

  • To avoid oxidation, we need to change process

 under Nitrogen or vaccum

  • If we get good light yield, then we will change die to

produce “thin” scintillator for tile calorimeter

 thickness : 3mm , width : 1cm

ad