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LHC & LHCf news. Good news and bad news. T. Sako @ ICRR 4 Oct. 2008. LHC 2008/9/10 D-Day. 9/10 までに、 IP2->IP5 (beam1), IP8->IP6 (beam2) のテストは成功していた 9/10 media 260 人を集めて first circulation 9:30-10:30 beam1 を段階的にまわし順調に circulation 成功 午後、 beam2 も順調に成功 9/10 中に 100 周の連続周回 9/11 には RF 同期に成功.

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LHC & LHCf news

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Lhc lhcf news

LHC & LHCf news

Good news and bad news

T. Sako @ ICRR 4 Oct. 2008


Lhc 2008 9 10 d day

LHC 2008/9/10 D-Day

  • 9/10までに、IP2->IP5 (beam1), IP8->IP6 (beam2)のテストは成功していた

  • 9/10 media 260人を集めて first circulation

  • 9:30-10:30beam1を段階的にまわし順調にcirculation成功

  • 午後、beam2も順調に成功

  • 9/10中に100周の連続周回

  • 9/11には RF同期に成功


Trouble

Trouble

  • PS, SPSの不調(予想通り)

  • 9/12昼 IP8でのトランスの故障(交換に数日)

  • トランス交換待ちの間に S34のmagnet 5TeV用試験中にヘリウムもれ発生

  • 調査、修理のためには 1.9K->常温の必要あり。War-up, cool-downで最低1.5ヶ月。

  • もともと、Christmas-Easterは shutdownの予定(7TeVの準備)だったため、そのままshutdownに。


Lhcf 9 10 9 12

LHCf 9/10-9/12


Search for bptx synchronized signal in lhcf front scintillator

Search for BPTX synchronized signal in LHCf Front Scintillator

LHCf

Arm1

beam2

LHCf

Arm2

Front Counter

(thin plastic scintillator)

Beam-gas

expected

12-Sep-2008 By the LHCf collaboration


Lhc lhcf news

Data with Beam2

Pedestal Data

このあと、タイミング微調整、カロリーメータ信号・位置検出器信号のチェック、450GeV collisionに向かうつもりだったが…

Arm1 Arm2

Arm1 Arm2


Lhc status plan

LHC Status & Plan

  • もうすぐ地下に入り、トラブル状況の確認

  • 現状確認をうけて、officialな restart planが示される予定

  • LHCfはいつでもOKの状態なので、ソフトウェア整備、解析、将来の打ち合わせをしながら待つ


Detail

detail

  • 116 FC triggers on 8,275,034 BPTX

  • 2x109 protons per bunch

  • 116 triggers on N=1.7x1016 protons

  • Suppose;

    • Gas density ρ[cm-3]

    • Effective distance L= 100 [m] = 10,000 [cm]

    • Cross section σ=80 [mbarn]

  • ρLσN = 116

  • ρ= 8.5x106 H [cm-3] = 8.5x1012 H [m-3] = 4x1012 H2 [cm-3]

  • 1012 H2 [cm-3] is predicted in LHC Project Report 783

  • (LHCf aperture is ignored above)


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