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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

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。



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 Scintillator

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 Scintillator

  • 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 Scintillator

  • 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)