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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. 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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  1. LHC & LHCf news Good news and bad news T. Sako @ ICRR 4 Oct. 2008

  2. 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

  3. 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。

  4. LHCf 9/10-9/12

  5. 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

  6. 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

  7. 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

  8. 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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