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Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka / Aug 22 2001. Current Status of TOF Analysis. 1. PHENIX 実験とは 2.なぜ新たな検出器が必要か? 3. Time Zero Counter の設計 4.テスト実験( KEK ) 5.まとめ. 1. Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka / Aug 22 2001. TOF Performance. CERN WA98 (1996).

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Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka / Aug 22 2001

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Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

Current Status of TOF Analysis

1.PHENIX実験とは

2.なぜ新たな検出器が必要か?

3.Time Zero Counter の設計

4.テスト実験(KEK)

5.まとめ


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

TOF Performance

CERN WA98 (1996)

PHENIX TOF (Dec 2000)

Tsukuba-Yonsei Workshop

By Akio Kiyomichi

σ<110ps

s ~ 85ps

We want to understand the contents of 110psec time resolution.

  • New calibration parameter

  • Another cause

  • Cable length , FEM jitter


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

New Calibration Parameter

Dec , 2000

Aug , 2001

9 TOF parameter set

9 TOF parameter set

Update !

  • Time offset

  • Slewing parameter

  • Y position offset

  • Light velocity in scint.

  • Energy loss conversion factor

  • Time conversion factor

  • Charge conversion factor

  • TVC/QVC pedestal

  • Global Time offset ( still 0 value )

  • Time offset

  • Slewing parameter

  • Y position offset

  • Light velocity in scint.

  • Energy loss conversion factor

  • Time conversion factor

  • Charge conversion factor

  • TVC/QVC pedestal

  • Global Time offset

Update !

Update !

Update !

Update !

By Akio Kiyomichi

BBC parameter set

BBC parameter set

No Run dependence

Checked Run dependence

By Takashi Hachiya

(Univ. of Hiroshima)


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

Example. Slewing Correction Update

Old(DSTv03)

New(DSTv05)

Timing[ns]

Timing[ns]

QVC[ch]

QVC[ch]

Spread

  • Problem in v03:

    • Slewing curve is weak by effect of attenuation.

  • for DSTv05

    • Select hit region on scintillator.

    • To compensate for low statistics, add 32 PMTs with

      • PMT Gain correction & Timing adjustment

Fitting function: y = A + B/sqrt(x)

6cm

PMT

|Track_projection - slat_center| <3cm

64cm

Akio KiyomichiAnalysis [email protected] Aug 2 2001


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

TOF Performance For Year-1

used data :

run11011 - 11775

cut criteria :

  • centrality 0-5% [cent == 0]

  • dch_quality == 23 or 31

  • eloss > 2MeV

  • dR < 2 sigma (matching cut)

  • |tofz|<50cm && tofy>-100cm

    • (panel 3 or 4)

Timing[ns]

  • Year-1 Time-of-flight resolution < 100ps.

Momentum [GeV/c]

Akio KiyomichiAnalysis [email protected] Aug 2 2001


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

Another Cause worsen resolution

  • Cross talk on FEM board

  • several hits on slat

cross talk !

ALL 501event 96 ± 5 ps

No cross talk

462event 97 ± 5 ps

Clean hit only

341event 89 ± 7 ps

several hits

TOF – L/(c・β)[nsec]

clean hit !

  • A cut of clean hit only is effective !

Cut Criteria : Run11011-11775,cent[0-5%],Q=23or31,eloss>2MeV,dR<2sigma,1.4<p<1.8MeV,TOF Panel 1,3and4


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Panel 3or4 , Run#10758-11775

Panel 3or4 , Run#11011-11775

Panel 1or3or4 , Run#11011-11775

Panel 1or3or4 , Run#10758-11775


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

No Cross Talk

Cross Talk

Clean Hit Only

< 2 Hits


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

37m Cable + FIFO (PHENIX) or NONE(WA98)

North

South

① ~WA98

TOF FEM

TOF FEM

FIFO

σ~42ps

~3300

BBC TM

①BBC TM ========================⇒TOF FEM(N)

②BBC TM⇒TOF(S)side======⇒BBC side⇒TOF FEM(N)

③BBC TM⇒TOF(S)side⇒FIFO⇒BBC side⇒TOF FEM(N)

σ~50ps

~3000

③ ~PHENIX

  • TVC=3300[ch] is the dynamic range which we can measure a particle of beta=1.  

  • FIFO works as discriminator module.

  • A 37 meter long cable worse resolution a little.

σ~47ps

~3270

TVC[ch]


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

The Jitter between TOF and BBC


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

Jitter


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

20nsec delay cable problem

Year-1

Year-2

~1500ch

~ 2200ch

10


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

Appendix Online Monitoring By Kuroki

11


Yonsei tsukuba workshop hiroshi tsuruoka aug 22 2001

Yonsei – Tsukuba Workshop / Hiroshi Tsuruoka /Aug 22 2001

5.まとめ

12


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