LHC最新状況 - 東京大学素粒子物理国際研究センター

LHC 最初の200日
- 加速器の状況、全体像 -
2010年9月11日
物理学会(九州工業大学)
素粒子合同シンポジウム
「エネルギーフロンティアの新たな地平」
東大素粒子センター
小林富雄
今から2年前・・・
(2008年9月10日)
その9日後・・・
(2008年9月19日)
3
復旧と対策に1年2ヵ月
かかりましたが…
やっと始まりました
First collision at 450GeV+450GeV
(2009年11月23日)
Collision at 3.5TeV+3.5TeV started
(2010年3月30日)
復旧の詳細は高エネルギーニュース
・27-3 (2008) 163-171
近藤敬比古 「LHC加速器の現状
とCERNの将来計画」
・28-4 (2010) 270-279
小林富雄 「LHC実験始動」
をご覧ください。
(2010年4月1日)
LHC design parameters
Nominal settings
Beam energy (TeV)
7.0
Number of particles per bunch
1.15 1011
Number of bunches per beam
2808
Crossing angle (rad)
285
Norm transverse emittance (m rad)
3.75
Bunch length (cm)
7.55
Beta function at IP 1, 2, 5, 8 (m)
3.5TeV for 2010 and 2011
b* ∝s
0.55,10,0.55,10
Derived parameters
Luminosity in IP 1 & 5 (cm-2 s-1)
1034
Luminosity in IP 2 & 8 (cm-2 s-1)*
~5 1032
Transverse beam size at IP 1 & 5 (m)
16.7
Transverse beam size at IP 2 & 8 (m)
70.9
Stored energy per beam (MJ)
362
(~10 GJ in magnets)

N b N1N 2 f rev
LF
4 s xs y
(F: geometric luminosity reduction
factor doe to the crossing angle)
~100 fb-1 / year
Stored energy in LHC beam
100倍
SPS dipole vacuum chamber
2 MJ @ 400 GeV
TT40 transfer line quadrupole vac. Chamber
2.2 MJ @ 450 GeV
Collimators must survive
expected beam loss…
Milestones reached 2010 (August)
Date
Achieved
Mar 30
First collisions at 7 TeV centre of mass.
Luminosity ~ 2 1027 cm-2 s-1
April 24
First stable beams at 7 TeV, 3 on 3, squeeze to 2m.
Luminosity ~ 2 1028cm-2 s-1
Increase bunch intensity to 2 1010, Increase kb.
Regular physics runs
13 on 13, 8 colliding pairs per experiment.
Luminosity ~ 3 1029cm-2 s-1
Increase bunch intensity to nominal, squeeze to 3.5m.
No physics
June 25
First stable beams at 7 TeV, 3 on 3 nominal bunch.
Luminosity ~ 5 1029cm-2 s-1
July 15
13 on 13, 8 colliding pairs per experiment, 9 1010 / bunch
Luminosity ~ 1.5 1030cm-2 s-1
July 30
25 on 25, 16 colliding pairs per experiment, 9 1010 / bunch
Luminosity ~ 3 1030cm-2 s-1
Aug 19
48 on 48, 36 colliding pairs 1 5 and 8 (< in 2), 9 1010 / bunch
Luminosity ~ 6 1030cm-2 s-1
Stable running period to consolidate operation and MP
~2 MJ per beam !
50 on 50, 35 colliding pairs 1 5 and 8 (< in 2), 1.1 1011 / bunch
Luminosity ~ 1 1031cm-2 s-1
May
May 24
June
Aug
Aug 26
積分ルミノシティーは
~10倍/月のペース
Delivered integrated luminosity > 3 pb-1 (Aug.27)
今年後半の予定
7. Sep. 2010
Trains need to have
complete crossing schemes
Moved from W42 to W44
短期目標
Integrated luminosity of ≥1fb-1 by the end of 2011
• requires a peak luminosity of ≥ 1x1032 cm-2s-1 during 2011
• → must reach ~1 x1032 cm-2s-1 during 2010
長期目標
Integrated luminosity of ≥3000fb-1 by the end of the LHC life
• requires a peak luminosity of ≥ 5 x1034 cm-2s-1 during
2021-2030
• → integrated yearly luminosity of around 250-300fb-1
The 10 year technical Plan
13 TeV
7 TeV
14 TeV
L=5・10 34
L=10 34
11
Jul. 2010
S. Myers
詳しいことは明日のセッション
(12pSM:LHC upgrade および ILC計画)
をお聴きください
Preliminary Long Term Predictions
Aug. 2010
R. Bailey
[email protected]
[email protected]
[email protected]
Higgs
[email protected]
ADD [email protected]