1259

˙ ‫঺ڀݚ‬հ

LHC/ATLAS Run2 ͷ‫ݱ‬ঢ়‫౎ژ‬େֶ ཧֶ‫ڀݚ‬Պ۱ా ౔ࢺ
Toshi.Sumida@cern.ch
2016 ೥ (ฏ੒ 28 ೥) 2 ݄ 15 ೔

1

͸͡Ίʹ

LHC ͸ 2010 ೥͔Β 2012 ೥຤·Ͱͷ Run1 ‫͓ʹؒظ‬͍ͯɼώοάεཻࢠͷൃ‫͏͍ͱݟ‬େ͖ͳ੒ՌΛಘͨ [1]ɻͦͷ‫ޙ‬໿ 2 ೥ͷγϟοτμ΢ϯ‫( ؒظ‬Long Shutdown1ɼ

LS1) Λ‫ͯܦ‬ɼLHC ͸ཅࢠিಥͷॏ৺‫ܥ‬ΤωϧΪʔΛ 8
TeV ͔Β 13 TeV ʹେ͖͘޲্ͤ͞ɼ͍Α͍Α 2015 ೥
4 ݄͔ΒӡసΛ࠶։ͨ͠ɻ
ࠓճ͸ಛूͱͯ͠ɼRun2 ॳ೥ͱͳΔ 2015 ೥ͷϥϯͷঢ়‫ ͱگ‬ATLAS ࣮‫Ͱݧ‬औಘ͞Εͨσʔλղੳͷ‫ݱ‬ঢ়ʹ
͍ͭͯ 3 ͭͷ‫Ͱࣄه‬ใࠂ͢Δɻ෺ཧղੳ݁Ռʹ͍ͭͯ͸࣍ͷ 2 ͭͷ‫঺Ͱࣄه‬հ͢Δ͜ͱͱ͠ɼ͜͜Ͱ͸·ͣRun2 ʹ͓͚Δ LHC Ճ଎‫ ͱث‬ATLAS ‫ݕ‬ग़‫ث‬ͷ‫ݱ‬ঢ়ʹ͍ͭͯड़΂Δɻਤ 1: 2015 ೥ 4 ݄ 7 ೔ʹ͓͚Δ LHC ͷ֤ηΫλʔͷԹ
౓ɻ4 ݄ 3 ೔ʹશηΫλʔͰྫྷ٫͕‫[ ͨྃ͠׬‬4]ɻ

2

LHC Ճ଎‫ث‬͜ͷΑ͏ʹɼLHC ͸࠶Քಇ‫ޙ‬ͷେ͖ͳҰาΛ౿Έग़

LHC (Large Hadron Collider) ͸εΠεɾδϡωʔϒ߫֎ͷ CERN ʹ‫ݐ‬ઃ͞Εͨɼੈք࠷େɼ࠷ߴΤωϧΪʔͷཅࢠཅࢠিಥ‫ܕ‬Ճ଎‫͋Ͱث‬Δɻप௕ 27 km ͷϦϯά͕஍Լ 100 m ͷτϯωϧʹઃஔ͞Ε͓ͯΓɼઃ‫্ܭ‬ͷ√࠷େॏ৺‫ܥ‬ΤωϧΪʔ ( s) ͸ 14 TeV ʹͳΔɻ͕ͨ͠ɼ2015 ೥தͷ LHC Ճ଎‫ث‬ͷӡసޮ཰͸ɼ༷ʑͳࠔ೉ʹΑΓ༧ఆ௨Γʹ͸্͕Βͳ͔ͬͨɻҎԼͰ͸ίϛογϣχϯάΛ‫ؚ‬Ίͨӡసͷ‫ܦ‬ҢΛड़΂ɼൃ‫͞ݟ‬ΕͨͦΕͧΕͷ໰୊ʹ͍ͭͯઆ໌͢Δɻ·ͨ‫ࡏݱ‬ͷঢ়‫ͭʹگ‬͍ͯ΋ใࠂ͢Δɻ

LHC Ͱ͸ӡస։࢝௚‫ޙ‬ͷ 2008 ೥ 9 ݄ɼ௒఻ಋ࣓ੴ
ͷ݁߹෦෼ʹ͓͚Δ઀ଓෆྑʹΑΓྫྷ٫༻ϔϦ΢Ϝͷྲྀग़ࣄ‫[ ނ‬2, 3] ͕͋ͬͨͨΊɼຊ֨తͳิमΛߦ͏·Ͱ͸

2.1௒఻ಋ࣓ੴͷτϨʔχϯάΫΤϯν

ਤ 1 ͷΑ͏ʹɼLHC ͸ 8 ͭͷηΫλʔʹ෼͔Ε͓ͯϏʔϜΤωϧΪʔΛԼ͛ͯӡసΛߦ͏͜ͱʹͨ͠ɻ2010√೥ͱ 2011 ೥͸ s = 7 TeV Ͱͷ࣮‫ݧ‬Λߦ͍ɼ2012 ೥√ʹ͸ s = 8 TeV ·ͰΤωϧΪʔΛ্͛ͨɻΓɼͦΕͧΕͷηΫλʔͷ‫ڥ‬քʹ‫ݕ‬ग़‫͕ث‬ஔ͔Ε͍ͯΔɻͦͷ‫ޙ‬ͷ LS1 ‫Ͱؒظ‬ɼ௒఻ಋઢࡐͷվमͱิ‫ڧ‬ɼ఍ग़‫ث‬͸ͪΐ͏ͲϦϯάͷ൓ରଆͷϙΠϯτ 5 Ͱ͋Δɻ֤

߅ଌఆͳͲΛߦ্ͬͨͰɼ2015 ೥ 4 ݄ʹ LHC ͸ Run2

ηΫλʔ͸྆୺ͷϙΠϯτ൪߸Λ༻͍ͯɼηΫλʔ 12ɼͱͯ͠ՔಇΛ࠶։ͨ͠ɻͦͷ‫ ޙ‬2ϲ݄ͷίϛογϣχϯ

ηΫλʔ 67 ͳͲͱ‫ݺ‬শ͢Δɻ

ྫ͑͹ ATLAS ‫ݕ‬ग़‫͕͋ث‬Δͷ͸ϙΠϯτ 1ɼCMS ‫ݕ‬άΛ‫ͯܦ‬ɼ6 ݄ 3 ೔ʹॳΊͯॏ৺‫ܥ‬ΤωϧΪʔ 13 TeVϏʔϜΛ‫͛ۂ‬ΔͨΊͷ૒‫࣓ిۃ‬ੴΛӡసঢ়ଶʹ͢Δʹ

ͷཅࢠিಥʹ੒ޭͨ͠ɻͦͷ‫͔ޙ‬Β೥຤·Ͱͷ‫ʹؒظ‬͸ɼ௒఻ಋঢ়ଶʹ͢ΔͨΊͷྫྷ٫ͱ࣓৔ʹඞཁͳిྲྀ͕

গͣͭ͠ೖࣹόϯν਺Λ૿Ճͤ͞ɼ࠷ऴతʹόϯν਺͸ྲྀΕΔ͔Ͳ͏͔ͷύϫʔςετ͕ඞཁͰ͋ΔɻҰ౓ͷࢼ

−2 −1

s

ߦͰͦͷిྲྀ஋ʹ౸ୡͰ͖ΔΘ͚Ͱ͸ͳ͘ɼ͋ΔిྲྀྔΛ௒͑ͨɻʹ᫼͢Δͱి࣓ੴ͸ԿΒ͔ͷ‫ݪ‬ҼͰΫΤϯνΛ‫͜͠ى‬ɼ

33

2244 όϯνɼϐʔΫϧϛϊγςΟ͸ 5 × 10
ʹୡ͠ɼఏ‫ੵͨ͠ڙ‬෼ϧϛϊγςΟ͸ 4 fb

−1

cm

2
260

ਤ 2: LHC ͷ֤ηΫλʔͰ 6.5 TeV ϏʔϜʹඞཁͳిྲྀ (఺ઢ) ʹ᫼͢Δ·ͰͷΫΤϯνճ਺ɻηΫλʔ 45 Ͱ௒఻ಋঢ়ଶ͕ഁΕΔɻిྲྀ͕อ‫ޢ‬ճ࿏Λ௨ͯ͠ಀ͛Δࡍ
ʹൃ೤ͯ͠Թ౓΋গ্͠ঢ͢ΔͷͰɼ࠶౓ྫྷ٫ΛߦͬͯిྲྀΛྲྀ͢ςετΛ‫܁‬Γฦ͢ɻͦ͏͢ΔͱɼલճΑΓ΋ΫΤϯν͕‫͜ى‬Δిྲྀྔ͕ߴ͘ͳΔɻ͜ͷΑ͏ͳ‫ݱ‬৅ΛτϨʔχϯάͱ‫ͼݺ‬ɼLHC Ͱ͸‫ج‬ຊతʹ 7 TeV ϏʔϜʹඞཁͳిྲྀྔ (11.85 kAɼ8.3 T) ·Ͱ஍্ͰτϨʔχϯάΛ‫͓ͯྃ͘͠׬‬ɻ࣮ࡍʹ஍ԼͰςετΛ։࢝ͯ͠ΈΔͱɼτϨʔχϯά͕‫ͨྃ͠׬‬͸ͣͷ࣓ੴ΋࠶౓ଟ਺ͷΫΤϯνΛ‫͜͠ى‬ਤ 3: 13 TeV ཅࢠিಥʹ੒ޭͨ͠ॠؒͷ LHC ίϯτϩʔϧϧʔϜͷ༷ࢠ [5]ɻDelivered Luminosity [pb-1/0.5]

໿ 50 ճͷτϨʔχϯάΛඞཁͱͨ͠ [4]ɻ6

50ns: <µ> = 20
25ns: <µ> = 17

5
4
3
2

ͨ (‫ه‬ԱΛࣦ͏ɼͱද‫͞ݱ‬ΕΔ)ɻಛʹηΫλʔ 45 Ͱ͸ɼ1

6.5 TeV ͷిྲྀʹ᫼͢Δ·Ͱʹ༧૝Λେ͖͘௒͑Δ໿ 50

00ճͷΫΤϯνΛඞཁͱͨ͠ɻ1 ౓ΫΤϯν͕‫͜ى‬Δͱ࠶

ATLAS Online Luminosity 2015, s=13 TeV

5

10

15

20

25

30

35

40

45

50

Mean Number of Interactions per Crossingྫྷ٫ʹ͸ 8 ࣌ؒ΄Ͳ͔͔Δɻ·ͨηΫλʔ 34 ͱ 78 ͷճ࿏ʹ͓͍ͯ‫ͯͬޡ‬άϥ΢ϯυʹಋ௨͍ͯ͠ΔՕॴ͕ൃਤ 4: 50 ns ͱ 25 ns όϯνִؒͦΕͧΕͷϥϯʹ͓͚‫͞ݟ‬ΕΔͳͲͨͨ͠ΊɼͦͷमཧɼνΣοΫͳͲΛ‫ؚ‬ΊΔฏ‫ۉ‬ύΠϧΞοϓ਺ͷ෼෍ [6]ɻͯɼίϛογϣχϯάʹ͸໿ 1ϲ݄༨෼ʹ͕͔͔࣌ؒΔ
͜ͱͱͳͬͨ 1 ɻ

8 ݄͔Β LHC ͸࣍ͷஈ֊΁ͱਐΜͩɻ50 ns ͔Β 25 nsόϯνִؒ΁ͷҠߦͰ͋Δɻ50 ns ִؒɼͭ·Γ൒෼ͷ

2.22015 ೥ϥϯόϯν਺Ͱ࠷େ‫ݶ‬ͷϧϛϊγςΟʔΛಘΑ͏ͱ͢Δͱɼ
Ͳ͏ͯ͠΋ 1 όϯνʹ٧ΊΔཅࢠͷ਺Λଟ͘͢Δඞཁ
͕͋Δɻ͔ͦ͠͠ͷ৔߹ɼ1 όϯν͕ަࠩͨ͠ͱ͖ʹ‫ى‬

LHC ͷ‫ऀڀݚ‬ɼٕज़ऀ͸Πʔελʔ‫ٳ‬ՋΛฦ্ͯ͠࡞‫ۀ‬ΛਐΊɼ࠷ऴతʹ͸ 4 ݄ 5 ೔ʹ 450 GeVɼ4 ݄ 10
೔ʹ 6.5 TeV ͷϏʔϜपճ (1 ຊͣͭ) ʹ੒ޭͨ͠ɻ

͜Δಉ࣌িಥ਺ (ύΠϧΞοϓ) ͕૿େ͠ɼ‫ڵ‬ຯͷ͋Δͦͷ‫ޙ‬໿ 2ϲ݄ͷؒ͸ϏʔϜͷίϛογϣχϯάΛ‫ܧ‬τͳ൓Ԡ͔Βͷ‫د‬༩͕ͦ͜ʹՃΘͬͯ͠·͏ɻͱ͍͏Θ

ଓ͠ɼ6 ݄ 3 ೔ɼ͍ͭʹ LHC ͸࠷ॳͷ 13 TeV ཅࢠཅ

͚Ͱɼ25 ns Ͱͷ࣮‫ݧ‬͸ͦΕࣗମͰ෺ཧଌఆͷ‫౓ײ‬Λ্ࢠিಥʹ੒ޭͨ͠ɻզʑશһ͕େ͖ͳ‫ڵ‬ฃͱ‫͜ʹڞ‬ͷ͛Δ͜ͱʹͳΔɻਤ 4 ͸ ATLAS ‫ݕ‬ग़‫Ͱث‬ଌఆ͞Εͨɼ෺ཧࣄ৅͕‫ͨͬ͜ى‬ϋʔυͳ൓Ԡʹରͯ͠਺े΋ͷιϑ”first stable beam” Λܴ͑ͨ (ਤ 3)ɻ͜͜Ͱ LHC ͸Ұ

50 ns ͱ 25 ns ͦΕͧΕͷόϯνִؒϥϯͰͷύΠϧͭͷઅ໨Λܴ͕͑ͨɼ΋ͪΖΜͨͩিಥ͕‫͚ͩͨͬ͜ى‬Ξοϓ෼෍Ͱ͋Δɻ‫ޙ‬ड़ͷΑ͏ʹ 25 ns ͷํ͕ϧϛϊγͰ͸෺ཧ݁Ռ͸ಘΒΕͳ͍ͷͰɼҾ͖ଓ͖ LHC ͸ً౓ςΟʔ͕ߴ͍ʹ΋͔͔ΘΒͣɼύΠϧΞοϓ͸΍΍௿͘޲্ͷͨΊʹ࡞‫ۀ‬Λ‫ܧ‬ଓͨ͠ɻ཈͑ΒΕ͍ͯΔ͜ͱ͕Θ͔Δɻ

7 ݄ 14 ೔ʹ͸ɼ50 ns ͷόϯνִؒͰ 2015 ೥ͷ࠷େҎԼͰड़΂Δ৭ʑͳ໰୊ʹಥ͖౰ͨΓͳ͕Β΋ɼLHC

ͱͳΔ 476 όϯνͷೖࣹ͕ߦΘΕɼ͜ͷͱ͖ͷॠؒϧϛ͸ண࣮ʹόϯν਺Λ૿΍͠ɼ࠷ऴతʹ͸૯όϯν਺ 2244

ϊγςΟʔ͸ 1.6 × 1033 cm−2 s−1 Ͱ͋ͬͨɻ

ͰͷӡసΛߦͬͨɻ·ͨ͜ͷͱ͖ͷॠؒϧϛϊγςΟʔ

1 7 TeV ʹ᫼͢Δʹ͸͞Βʹଟ਺ͷΫΤϯν͕‫͜ى‬Δ (͔͜͜Βͷޯ഑͕ͳ·Δ) ͱ༧૝͞Ε͍ͯΔͷͰɼ͜ͷτϨʔχϯά‫ؒظ‬Λ͍͔ʹ୹͘͢Δ͔͸ࠓ‫ޙ‬ͷ՝୊Ͱ͋Δɻ

͸ 5 × 1033 cm−2 s−1 Ͱ͋ͬͨɻ

3

25 ns & electron cloud

261

SEY

Beam screen
25 ns

Typical e– densities1010–1012 m–3

Possible consequences:

ਤ–6:instabilities,ϏʔϜύΠϓ಺Ͱͷ
2 ࣍ిࢠͷൃੜ‫[ ߏػ‬9]ɻ
emittance growth, desorption – bad vacuum– excessive energy deposition in the cold sectors

Electron bombardment
2.3.3
ిࢠӢ of a surface has been proven to reduce drastically thesecondary electron yield (SEY) of a material. This technique, known as scrubbing,provides a mean to suppress electron cloud build-up.

‫ܧ‬ଓతͳ໰୊ͱͳͬͨͷ͕ɼϏʔϜதͷిࢠӢ (elec-ਤ 5: LHC ಺Ͱൃ‫͞ݟ‬Εͨਖͷ֦େࣸਅ [7]ɻ6ͰtronElectron
cloud) Ͱ͋ͬͨɻిࢠӢͷൃੜ͢Δ‫ݪ‬ཧΛਤ
cloud significantly worse with 25 nsઆ໌͍ͯ͠Δɻ·ͣɼϏʔϜ͕‫͛ۂ‬ΒΕΔͱ͖ʹγϯΫϩτϩϯ์ࣹ͕‫͜ى‬ΓɼͦΕ͕ύΠϓ಺นͷϏʔϜεΫ

2015 ೥ʹ‫ͨͬ͜ى‬໰୊ͱࠓ‫ޙ‬ͷରࡦϦʔϯʹ౰ͨͬͯɼޫిࢠΛൃੜͤ͞Δɻൃੜͨ͠ిࢠ

ҎԼͰ͸ɼRun2 ։࢝‫ͨ·ޙ‬͸։࢝લͷίϛογϣχ

นͰ 2 ࣍ిࢠΛग़͢ɻ͋ͱ͸ઇ่‫ʹߏػ‬Αͬͯେྔͷి

2.3

ϯά࣌ʹൃ֮ͨ͠Ճ଎‫ث‬ӡసʹ͓͚Δॾ໰୊ʹ͍ͭͯઆ໌͢Δɻ͸ཅࢠόϯνʹҾͬுΒΕͯՃ଎͞ΕɼͦΕ͕ϏʔϜ಺ࢠ͕ϏʔϜதʹൃੜͯ͠͠·͏ɻ͜ͷ݁Ռͱͯ͠ɼϏʔϜͷΤϛολϯε͕͙͢ʹѱ
͘ͳΔɼϏʔϜͷ‫ي‬ಓ͕ෆ҆ఆʹͳΔɼ೤ෛՙ (Heat-

2.3.1

UFO

13 TeV ͰͷϏʔϜিಥ͕࢝·͙ͬͯ͢ʹ‫͔ͨͬͭݟ‬໰୊ͷҰ͕ͭ Unidentified Falling Objects (UFOs) ͰLoad) ্͕ঢ͢Δɼ·ͨਅۭ͕ѱԽ͢ΔɼͳͲͷଟ͘ͷѱӨ‫͕ڹ‬ग़Δɻ͔͠΋ɼग़͖ͯͨޫిࢠ͸͙࣍͢ͷόϯνͰՃ଎͞ΕΔ֬཰͕ߴ͘ɼ25 ns ϥϯͰ͸͞ΒʹӢͷൃੜ଎౓্͕͕ͬͯ͠·͏ɻ͋Δ [7]ɻLHC ϏʔϜγʔϧυ্෦͔Βਖ (ਤ 5) ͷΑ͜ͷ໰୊΁ରॲͱͯ͠͸ɼ෺ཧϥϯͱ͸ผʹɼγϯΫ͏ͳ΋ͷ͕ϏʔϜதʹམ͖ͪͯͯɼͦΕ͕ϏʔϜͱඇ஄ϩτϩϯ์ࣹΛ಺นʹ౰ͯΔ͜ͱͦͷ΋ͷΛ໨తͱ͠ੑিಥΛ‫͜͠ى‬ɼ݁Ռͱͯ͠ཅిՙΛ࣋ͬͨ UFO ͕ͨ͞ӡసΛߦ͍ɼ࢓ࣄؔ਺ͷখ͍͞ిࢠΛ͋Β͔͡Ίग़ͤΒʹϏʔϜʹ஄͔ΕΔɼͱ͍͏‫ݱ‬৅͕‫͍ͯͬ͜ى‬Δ͜ͱ

Δ͚͓ͩͩͯ͘͠ɼͱ͍͏ํ๏͕༗ޮͰ͋Δɻ͜ͷ࡞‫ۀ‬͕Θ͔ͬͨɻUFO ͱϏʔϜ͕িಥ͍ͯ͠Δؒ͸‫ٸ‬଎ʹ

Λ “scrubbing” ͱ‫Ϳݺ‬ɻ·͞ʹ಺นΛલ΋ͬͯຏ͍ͯ

ϏʔϜ͕ࣦΘΕɼͦΕ͕ϏʔϜϩεϞχλʔͰ‫ݕ‬஌͞Ε͓͘Θ͚Ͱ͋Δɻ͞Βʹɼ͋Δཅࢠόϯνʹରͯ͠ 5 nsΔͱϏʔϜμϯϒ͕‫͜ى‬Δɻ·ͨࢄཚཻͨ͠ࢠʹΑͬͯͳͲͷ୹ִ͍ؒ (RF ͷ 2 ೾௕෼ʹ૬౰͢Δ) Ͱ෇ଐ͠ΫΤϯν΋Ҿ͖‫͜͞ى‬Εͯ͠·͏ɻͨόϯνΛՃ͑ͯ΍Δ͜ͱʹΑͬͯɼΑΓޫిࢠΛޮՌ͜Εʹ͍ͭͯ͸ಛʹ༗ޮͳରࡦ͕ଧ͓ͯͯΒͣɼ࣮‫ݧ‬ॳ‫ ܭʹظ‬17 ճͷϏʔϜμϯϓͱ 2 ճͷ௒఻ಋ࣓ੴͷΫతʹग़ͤΔ͜ͱ͕Θ͔͍ͬͯΔɻ2016 ೥͸͜ͷΑ͏ͳscrubbing ϥϯΛ෺ཧϥϯͷؒʹͰ͖Δ͚ͩ௕͘औΔ͜

ΤϯνΛҾ͖‫ͨ͜͠ى‬ɻ͔͠͠ɼ࣮‫ݧ‬։࢝࣌ʹ࠷େͰ 1ͱͰσʔλऩूͷޮ཰Λ޲্ͤ͞Δ༧ఆͰ͋Δɻ࣌ؒʹ 40 ‫ݸ‬΋‫ݕ‬஌͞Ε͍ͯͨ UFO ͸ 25 ns Λ‫ܧ‬ଓͨ͠࠷‫ޙ‬ͷํͷϥϯͰ͸ 10 ‫ݸ‬ఔ౓·Ͱ‫ݮ‬গͨ͠ͷͰɼ2016೥͸͜ͷ··‫ܦ‬աΛ‫ݟ‬कΔ༧ఆͰ͋Δɻ

2.3.4

QPS

গ্͠Ͱड़΂ͨΫΤϯνอ‫( ߏػޢ‬Quench Protection

2.3.2

ULO

System, QPS) ʹ͍ͭͯ͸ɼ࠶ͼϔϦ΢Ϝྲྀग़ࣄ‫ނ‬ͷΑ͏ͳ͜ͱΛ‫͍ͳ͜͞ى‬Α͏ɼΑΓ࣮֬ͳಈ࡞Λอূ͢Δ

UFO ͱ͸ผͷϏʔϜதʹଘࡏ͢ΔʮԿ͔ʯ͕ Run2 ͷϏʔϜίϛογϣχϯάதʹൃ‫͞ݟ‬Εͨɻ͜ΕΛ Uniden-ͨΊʹ LS1 தʹγεςϜΛશަ‫׵‬Λߦ͍ͬͯͨɻ͔͠͠ɼ

tified Lying Object (ULO) [8] ͱ‫ͼݺ‬ɼ͜Ε΋ಉ࣮͘͡‫ݧ‬౰ॳͷϏʔϜϩεΛҾ͖‫ͨ͜͠ى‬ɻରࡦͱͯ͠ɼϏʔϜ‫ي‬ಓΛਫฏํ޲ʹ 3 mmɼԖ௚ํ޲ʹ 1 mm ͣΒͯ͠

Event Upset ʹΑͬͯ‫ޡ‬ಈ࡞͕‫͖ى‬ɼϏʔϜΛμϯϓ͜͠ΕΛආ͚Δ͜ͱʹΑΓɼϏʔϜͷ‫্͕͕ͨͬ౓ڧ‬৔߹ͯΛަ‫͠׵‬ɼQPS ‫ى‬ҼͷϏʔϜμϯϓ͸શମͷ 43%͔Ͱ΋໰୊ͳ͍ͱ͍͏͜ͱ͕Θ͔ͬͨͷͰɼ2016 ೥΋͜Β 7%·Ͱ௿‫ͨ͠ݮ‬ɻͷରॲΛ‫ܧ‬ଓ͢Δɻ͜ͷͱ͖ʹ࢖༻ͨ͠νοϓͷ์ࣹઢ଱ੑ͕௿͘ɼSingle
ͯ͠·͏ͱ͍͏໰୊͕‫͍ͨͯͬ͜ى‬ɻ͜Εʹ͍ͭͯ͸ɼ
8 ݄຤ͷςΫχΧϧγϟοτμ΢ϯͰ 1140 ‫ݸ‬ͷϘʔυશ

13 The initial projections of integrated luminosity for2015 were ~ 8-10 fb-1.

Achieved ~ 4.3 fb-1
4

 Slope at the end of the run better than in 2011,262

and close to 2012 slope(last week of operation > 1 fb-1)
ද 1: 2012 ೥ͱ 2015 ೥Ͱͷ LHC ͷ࠷ߴੑೳͷൺֱɻThe main reasons for theσβΠϯ࣌ͷ஋΋ಉ࣌ʹ‫͍ͯ͠ࡌه‬Δɻ
lower value:
ύϥϝʔλ
2012
ઃ‫ܭ‬஋
)
- Start-up2015
delays ((~4 weeks),ϏʔϜΤωϧΪʔ [TeV]

4

6.5

7

όϯνִؒ [ns]- Availability
50
25 issues: 25

β ∗ [m]ཅࢠ਺/όϯν [1011 ]Τϛολϯε [µm]0.60quench
0.80
0.55
protection
tunnelelectronics;
solved1.6
1.15
1.15after TS2- Electron clouds mitigation
2.5
3.5
3.75

૯όϯν਺

1374
2244
2808
LHC Machine Status Report
1368 125th2232
2808
LHCC

িಥόϯν਺

radiation failures on the

Frédérick Bordry
2nd March 2016ॠؒϧϛϊγςΟʔɹ [1034 cm−2 s−1 ]ύΠϧΞοϓ

> 0.7
35

∼ 0.5
15

1.0
30

஝ੵΤωϧΪʔ [MJ]

140

270

362

ਤ 7: Run1 ͱ Run2 Ͱͷੵ෼ϧϛϊγςΟʔͷൺֱ 4[4]ɻ
Λ 40 cm ·ͰԼ͛ɼ2 ഒͷϧϛϊγςΟʔͰͷϥϯΛ໨ࢦ͍ͯ͘͠ɻ
ਤ 7 ͸ɼ೥ؒʹ LHC ͕ఏ‫ੵͨ͠ڙ‬෼ϧϛϊγςΟʔͷൺֱͰ͋ΔɻτʔλϧͰ͸ 2011 ೥ʹ‫ٴ‬͹ͳ͍͕ɼ௕

2.3.5‫ظ‬ͷ‫ࢭٳ‬௚‫Ͱޙ‬ΤωϧΪʔ͸ 13 TeVɼ͔ͭॳͷ 25 ns

TDIϥϯɼ͞Βʹ༷ʑͳ໰୊ʹରॲ͠ͳ͕ΒͷӡసͰ͋Δ͜લஈͷ SPS Ճ଎‫͔ث‬Β LHC ΁ͷཅࢠͷΠϯδΣΫ
γϣϯΛߦ͏ࡍɼΩοΧʔ͕ਖ਼ৗʹಈ࡞͠ͳ͍ͳͲͷ৔ͱΛߟ͑ΔͱɼΉ͠Ζ‫͖΂͘ڻ‬ੑೳΛग़ͨ͠ͱ‫͑ݴ‬Δͩ
Ζ͏ɻLHC ϝϯόʔͷ‫ؤ‬ுΓʹ‫͍ͨ͠ँײ‬ɻ߹ʹඋ͑ͯೖࣹϏʔϜΛड͚ࢭΊΔ໾ׂΛՌͨ͢ͷ͕

Injection Protection Device (ϑϥϯε‫໊ޠ‬ͷ಄จࣈ͔Β TDI) Ͱ͋Δ [10]ɻ͜Ε͸஠Խϗ΢ૉͷϒϩοΫͰ͋◦Γɼߴ͍೤఻ಋ཰ͱ௿͍๲ு཰Λ͕࣋ͭɼ450 C Ҏ্ͷԹ౓ʹ͸଱͑ΒΕͣɼೖࣹόϯν਺ͷઃ‫ݶܭ‬ք஋Ͱ͋
Δ 288 όϯνΛԾʹ͜ΕͰड͚ͱΊΔͱɼ͜ͷԹ౓Λ௒͑ͯ͠·͏ɼͱ͍͏໰୊͕͋ͬͨɻ͜ͷͨΊ 2015 ೥தʹ͸ೖࣹόϯνΛ࠷େ 144 ʹͯ͠ӡసΛߦΘ͟ΔΛ͑ͳ͔ͬͨɻ·ͨɼΞ΢τΨεʹΑΓ TDI ͷਅۭ͕ѱԽ͠ɼ·ͨ͜ΕʹΑͬͯ scrubbing ͷޮ཰΋௿Լͯ͠͠·͏ɻATLAS ‫ݕ‬ग़‫ث‬3

ATLAS ͸ LHC ͷিಥ఺ͷ 1 ͭʹઃஔ͞Εͨ൚༻‫ݕ‬ग़‫͋Ͱث‬Γɼͦͷ‫ݐ‬ઃͱӡసʹ೔ຊͷ‫͕ؔػڀݚ‬ଟ͘ࢀՃ͍ͯ͠Δɻਤ 8 ʹ ATLAS ‫ݕ‬ग़‫ث‬ͷશମਤΛࡌͤͨɻ಺ଆ͔Βॱʹɼ಺෦ඈ੻‫ݕ‬ग़‫ث‬ɼΧϩϦϝʔλɼϛϡʔΦϯ‫ݕ‬ग़‫ߏͰث‬੒͞Ε͍ͯΔɻ֤෦෼ͷৄࡉʹ͍ͭͯ͸ [11] Λ͝ࢀর௖͖͍ͨɻ

͜ͷͨΊɼTDI ʹ͍ͭͯ͸ 2015-2016 ೥ͷ࣮‫ࢭٳݧ‬‫ʹؒظ‬άϥϑΝΠτ੡ͷ΋ͷͱͷަ‫ߦ͕׵‬ΘΕͨɻ͜Ε
Ͱ 2016 ೥ϥϯͰ͸ 288 όϯνೖࣹʹΑΔ࠷େ 2800 όϯνͰͷিಥ࣮‫͑ߦ͕ݧ‬Δ͜ͱʹͳΔɻ

3.1‫ݕ‬ग़‫ث‬ͷӡసঢ়‫گ‬͔͜͜Β͸ ALTAS ࣮‫ݧ‬ͷ 2015 ͷঢ়‫͍ͯͭʹگ‬ड़΂͍ͯ͘ɻATLAS Ͱ͸ LS1 ‫ؒظ‬தɼॳ‫ظ‬ෆྑͳͲʹର͢Δ‫ނ‬োՕॴͷमཧΛਫ਼ྗతʹߦͬͨɻͦͷ݁Ռɼνϟϯ

2.4ϧϛϊγςΟ

Ҏ্ͷΑ͏ͳ 2015 ೥ʹ͓͚Δ LHC ͷঢ়‫گ‬Λ;·͑ͯɼՃ଎‫ث‬ͷੑೳΛ Run1 ͱൺֱͯ͠Έ͍ͨɻӡసύϥϝʔλΛද 1 ʹࡌͤͨɻLHC ͸ϏʔϜΤωϧΪʔͷ
޲্ͱ 25 ns όϯνִؒͰͷӡసΛՌ͕ͨͨ͠ɼϧϛϊγςΟʔʹؔΘΔύϥϝʔλʹ͍ͭͯ͸·ͩ࠷దԽ͕ਐ
ϝʔλͰ͋Δ β ∗ ʹ͍ͭͯ͸ɼϧϛϊγςΟʔ͕ͦͷ‫ٯ‬਺ʹൺྫ͢ΔͷͰॏཁͰ͋Δɻ͔͠͠ɼ2015 ೥தʹ͸ॾ໰୊ͷղܾΛ༏ઌͨͨ͠Ίɼ༧ఆ͍ͯͨ͠ 60 cm ·ͰͷվળΛߦ͏͜ͱ͕Ͱ͖ͳ͔ͬͨɻ2016 ೥ʹ͸͜Ε

Figure 1.1: Cut-away view of the ATLAS detector. The dimensions of the detector are 25 m inਤ The
8: overall
ATLAS‫ݕ‬ग़‫ث‬ͷશମਤɻheight and 44 m in length.
weight ofthe detector is approximately 7000 tonnes.
The ATLAS detector is nominally forward-backward symmetric with respect to the interaction point. The magnet configuration comprises a thin superconducting solenoid surrounding theinner-detector cavity, and three large superconducting toroids (one barrel and two end-caps) arranged with an eight-fold azimuthal symmetry around the calorimeters. This fundamental choice
has driven the design of the rest of the detector.

2008 JINST 3 SΜͰ͍ͳ͍͜ͱ͕Θ͔ΔɻಛʹϏʔϜͷ௕͞ํ޲ͷύϥ5Total Integrated Luminosity fb-1

263

‫ݕ‬ग़‫࠶ث‬Քಇʹࡍͯ͠ࡉ͔͍໰୊͸͋ͬͨ΋ͷͷɼATLAS ‫ݕ‬ग़‫ث‬શମͱͯ͠͸໰୊ͳ͘࠷ॳͷϏʔϜিಥΛܴ͑Δ͜ͱ͕Ͱ͖ͨɻਤ 9 ͸ɼ࠷ॳͷఆৗϥϯ͕͋ͬͨ2015 ೥ 6 ݄ 3 ೔ʹಘΒΕͨࣄ৅ͷҰͭͰ͋Δɻ·ͨϏʔϜӡసதʹ͓͚Δσʔλऔಘޮ཰͸໿ 92%
Ͱɼਤ 10 ͷΑ͏ʹ LHC ͷఏ‫ ͨ͠ڙ‬4.2 fb−1 ʹରͯ͠

3.9 fb−1 Λཅࢠཅࢠিಥσʔλͱͯ͠อଘͨ͠ɻ2012 ೥ʹ͸͜ͷ਺ࣈ͕ 93.5%Ͱ͋ͬͨ͜ͱΛߟ͑ΔͱɼRun2
ͱͯ͠σʔλऔಘΛ࠶։͙ͯ͢͠ͷ਺ࣈͱͯ͠͸ѱ͘ͳ͍ͱ‫͑ݴ‬Δɻ͔͠͠ࠓ‫͞ޙ‬ΒʹϧϛϊγςΟʔ্͕͕ͬ
ͨ৔߹ʹ΋σʔλऔಘγεςϜͱͯ͠ͷՔಇ཰Λߴ͘อͭ͜ͱ͸େ͖ͳνϟϨϯδͰ͋Δɻ͞Βʹ͜ͷ 3.9 fb−1ʹ͍ͭͯ‫ݕ‬ग़‫ث‬ͷঢ়‫گ‬Λ֬ೝ͠ɼ෺ཧղੳʹ࢖͑Δσʔλͱͯ͠࠷ऴతʹ࢒ͬͨͷ͸ 3.2 fb−1 Ͱ͋ͬͨɻ͜ͷͱ͖ʹɼ‫ޙ‬ड़͢Δ IBL ͷ໰୊ͳͲͰσʔλΫΦϦςΟʔ͕΍΍Լ͕ͬͯ͠·ͬͨɻ͜Εʹ͍ͭͯ͸དྷ೥ͷϥϯͰͷ՝୊Ͱ͋Δɻ

3.2

s = 13 TeV

LHC Delivered
ATLAS Recorded
All Good for Physics

4

Total Delivered: 4.2 fb-1

3

Total Recorded: 3.9 fb-1
All Good for Physics: 3.2 fb-1

2
1

1/6

Π [12]ɻ

͸ɼ࠷΋ѱ͍෦෼Ͱ΋໿ 97%ͱඇৗʹߴ͔ͬͨɻATLAS Preliminary0ਤ 9: ࠷ॳͷ 13 TeV িಥࣄ৅ͷΠϕϯτσΟεϓϨ

ωϧ਺ͱͯ͠ͷ 2015 ೥ϥϯʹ͓͚Δ‫ݕ‬ग़‫ث‬ͷՔಇׂ߹

5

1/7

1/8

1/9

1/10
1/11
Day in 2015

ਤ 10: 2015 ೥ʹ ATLAS ‫ݕ‬ग़‫Ͱث‬ಘΒΕͨੵ෼ϧϛϊγςΟʔͷਪҠ [6]ɻϧϛϊγςΟʔ‫͍͓ͯʹڥ؀‬΋τϥοΩϯάೳྗ͕ҡ࣋͞ΕΔ͜ͱ͕‫ظ‬଴͞ΕΔɻ

IBL ͷ੡࡞ͱΠϯετʔϧʹ͍ͭͯ͸ҎલʹߴΤωϧΪʔχϡʔεͰใࠂͨ͠ [13]ɻ͜͜Ͱ͸ 2015 ೥தͷίϛογϣχϯάͷঢ়‫ͱگ‬ಘΒΕͨੑೳʹ͍ͭͯใࠂ͢Δɻ

IBL ͸ɼεςʔϒͱ‫ݺ‬͹ΕΔηϯαʔϞδϡʔϧ͕౥ࡌ͞Εͨ௕ํ‫ܗ‬ͷ൘Λԁ౵্ʹ഑ஔ͢Δ͜ͱͰߏ੒͞
ΕΔɻ·ͨͦΕͧΕͷεςʔϒʹ͸ϑϨοΫεͱ‫ݺ‬͹Ε
Δి‫ͱݯ‬৴߸ઢͷͨΊͷϑϨΩγϒϧ‫ج‬൫͕૷ண͞Εͯ
͍Δɻ
ͯ͞ɼRun2 ͕࢝·͙ͬͯ͢ͷίϛογϣχϯάதʹ
IBL ͷΞϥΠϯϝϯτΛߦ͏ࡍʹɼεςʔϒ͕‫͕ͯͬۂ‬͠·͍ͬͯΔ͜ͱ͕൑໌ͨ͠ɻ‫ݪ‬ҼΛௐࠪͨ݁͠ՌɼIBLͷϑϩϯτΤϯυνοϓʹ͓͍ͯ TID(Total Ionization

Dose) ͷޮՌͰͷిྲ্ྀ͕ঢ͠ɼফඅిྗ͕૿Ճ͢Δͱ͍͏‫ݱ‬৅͕‫͍ͯͬ͜ى‬Δ͜ͱ͕Θ͔ͬͨɻ͜ΕʹΑͬͯԹ౓͕มԽ͠ɼεςʔϒͱϑϨοΫεͷૉࡐͷҧ͍ʹΑ

Run2 ʹ͓͚ΔΞοϓάϨʔυ

Cooling Pipe

Stave Flex
Carbon Foam

ATLAS Ͱ͸ LS1 ‫ݕʹؒظ‬ग़‫ث‬ɼτϦΨʔɼιϑτ

Inner Support Tube΢ΣΞͳͲʹ͍ͭͯଟ͘ͷΞοϓάϨʔυΛߦͬͨɻ͜
͜ͰͦͷશͯΛ঺հ͢Δͷ͸ෆՄೳͳͷͰɼͦͷ͏ͪͷ͍͔ͭ͘ʹ͍ͭͯऔΓ্͛Δɻ

3.2.1

IBL

ATLAS ʹͱͬͯ LS1 ࠷େͷΞοϓάϨʔυ߲໨͸
Insertable B-Layer (IBL) ͷಋೖͰ͋ΔɻϏʔϜύΠϓ͝ͱ 1 ͭͷύοέʔδͱͯ͠γϦίϯϐΫηϧ‫ݕ‬ग़‫ث‬Λ࡞੒͠ɼͦΕΛ಺෦ඈ੻‫ݕ‬ग़‫ث‬ͷ࠷಺૚Ͱ͋Δ‫ط‬ଘͷϐΫηϧ‫ݕ‬ग़‫ث‬ͷ͞Βʹ಺ଆʹઃஔ͢Δɻ͜ΕʹΑͬͯߴ

Inner Positioning Tube

Beam Pipe

Front-end Moduleਤ 11: IBL ͷϏʔϜͱਨ௚ͳํ޲Ͱͷஅ໘ਤ [14]ɻφํ޲ʹฒΜͰ͍Δ 1 ͭ 1 ͭͷϞδϡʔϧ͕εςʔϒͰ
͋Δɻ

6
264
TGCs
Large (odd numbered)
sectors
η=1.0

y

12 m

EML

RPCs

5

10

1

BOL

2

3

4

5
EEL

8

BML

1

2

3

4

6

1

BIL

2

3

4

5

6

5

η=1.3

6

6

4

2
1

3

4

2

TileCalTGC-FI

2

3

EIL4

η=1.9

2
EIL

1

End-cap
End-cap
magnettoroid

TGCs

η=2.4

1

CSC

0

σ(d ) [µm]

ਤ 12: Թ౓͝ͱʹଌఆͨ͠ IBL εςʔϒͷ࿷‫[ ۂ‬14]ɻ
400
350
300

0
0

2

4

6

8

10

12

[m]
14

16

ਤ 14: ATLAS ‫ݕ‬ग़‫ث‬ͷϛϡʔΦϯγεςϜɻ௚ઢ͸ͦATLAS Preliminary
0.0 < η < 0.2

Data 2012, s = 8 TeV
Data 2015, s = 13 TeV

ΕͧΕͷ η ྖҬΛࣔ͢ɻ੺͍‫ۂ‬ઢͷ໼ҹ͸ɼz ∼ 10 m෇ۙͰੜ੒͞Εͨ஗ཻ͍ࢠʹΑΔϑΣΠΫτϦΨʔͷ
Ұྫɻ

250
200

ͱͳΔɻ

150
100

L1 Ͱͷ൑அʹ࢖༻Ͱ͖ΔϨΠςϯγʔ͸ 2 µs ͱඇৗʹ୹͍ͨΊɼ͜ͷϩδοΫ͸ FPGA ΍ ASIC Λ༻͍ͨ50

ϋʔυ΢ΣΞ্Ͱߏங͢Δɻ͜ͷ L1 τϦΨʔ‫ݕ‬ग़‫ث‬ͷ͏

0
4×10-1

ͪɼThin Gap Chamber (TGC) ͱ‫ݺ‬͹ΕΔΤϯυΩϟο
1

2

3

4 5 6 7 8 910
20
pT [GeV]¥ ਤ 13: によって、
τϥοΫ p ͷؔ਺ͱͯ͠ಘΒΕͨ impact paTrameter ͷਫ਼౓ [15]ɻϓ෦ϛϡʔΦϯτϦΨʔ‫ݕ‬ग़‫͍ͯͭʹث‬͸ɼATLAS ೔ຊάϧʔϓ͕ͦͷ։ൃɼ੡࡞ɼΠϯετʔϧɼγεςϜߏங·Ͱ੹೚Λ࣋ͬͯߦ͖ͬͯͨ [16]ɻRun1 ‫ޙ‬൒͔Βͷ‫ݕ‬ग़‫ث‬ӡసɼLS1 ‫Ͱؒظ‬ͷ४උͱ Run2 ʹ͓͚ΔΞοϓάϨʔυʹ͍ͭͯ͸චऀ͕ओಋͯ͜͠ΕΛߦͬͨͷͰɼ

Δ೤๲ு཰ͷࠩʹΑΓɼεςʔϒͷ࿷‫͜ى͕ۂ‬Δͱཧղ͞Εͨɻ͜ͷ‫ػ‬ձʹগ͠঺հͤͯ͞௖͖͍ͨɻ
ਤ 14 ͸ ATLAS ‫ݕ‬ग़‫ث‬ͷ 1/4 ਤͰ͋ΔɻΤϯυΩϟο

͜ͷ໰୊ʹରॲ͢ΔͨΊɼਤ 12 ͷΑ͏ʹԹ౓͝ͱͷϓτϩΠυ࣓ੴͷ֎ଆʹɼTGC ͕ 3 ૚ઃஔ͞Ε͓ͯΓɼ‫͕ۂ‬ΓΛଌఆ͠ɼ͞ΒʹԹ౓ͷϞχλϦϯάʹΑΔֱਖ਼

͜ΕΒΛϛϡʔΦϯ͕ಥ͖ൈ͚ͨͱ͍͏৚݅Λ՝͢͜ͱͷස౓Λ૿΍ͨ͠ɻ͜ΕʹΑΓ IBL ͷਫ਼ີͳΞϥΠϯͰ L1 ϛϡʔΦϯτϦΨʔΛൃߦ͢Δɻ

ϝϯτ͕ՄೳʹͳͬͨɻϛϡʔΦϯΛऴঢ়ଶʹ‫ؚ‬Ήॏཁͳ෺ཧࣄ৅ͷଌఆͷ͜ͷ݁Ռɼਤ 13 ʹ‫ݟ‬ΒΕΔΑ͏ʹɼಛʹ௿͍ pT ྖͨΊʹ͸ಛʹߴ͍ԣํ޲ӡಈྔ (pT ) Λ࣋ͬͨϛϡʔΦҬͰͷτϥοΩϯάੑೳʹ͓͍ͯɼRun2 Ͱେ͖ͳվળ

ϯΛ‫ؚ‬Ήࣄ৅Λબ୒͢ΔτϦΨʔ͕ඞਢͰ͋ΔɻRun1

͕ಘΒΕͨɻࠓ‫ޙ‬͸ 2015 ೥ϥϯͰ‫ݟ‬ΒΕͨ৴߸ಡΈग़ʹ͓͚Δ LHC ͷϧϛϊγςΟʔ 7 × 1033 cm−2 s−1 ɼ√
s = 8 TeV Ͱͷিಥʹ͓͍ͯɼpT ᮢ஋͕ 20 GeV ͷ L1͠ͷෆ۩߹ͳͲΛमਖ਼͍ͯ͘͠༧ఆͰ͋ΔɻϛϡʔΦϯτϦΨʔ (L1 MU20) ͷϨʔτ͸໿ 7 kHz Ͱ

3.2.2

ϛϡʔΦϯ‫ݕ‬ग़‫ͱث‬τϦΨʔ

͋ͬͨɻRun2 தʹϧϛϊγςΟʔ͸ 1.5×1034 cm−2 s−1
ఔ౓·Ͱ૿‫͞ڧ‬ΕΔ༧ఆͰ͋Γɼ·ͨॏ৺‫ܥ‬ΤωϧΪʔATLAS ࣮‫ݧ‬ͷτϦΨʔ͸Ϩϕϧ 1 τϦΨʔ (L1) ͱϋ͕ 13 TeV ʹ্͕ͬͨ͜ͱͰ W Ϙιϯͷੜ੒அ໘ੵ΋ΠϨϕϧτϦΨʔ (HLT) ͔Βߏ੒͞ΕΔɻL1 τϦΨʔ૿͑ɼ࠷ऴతʹ L1 MU20 ͷτϦΨʔϨʔτ͸͜ͷ··͸ΧϩϦϝʔλͱϛϡʔΦϯγεςϜ͔Βͷ৴߸Λ༻͍

ͩͱ 30 kHz ఔ౓·Ͱ૿Ճ͢Δ͜ͱ͕‫·ࠐݟ‬Ε͍ͯΔɻ

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FI ίΠϯγσϯε͕͋Δ৔߹ʹτϦΨʔϨʔτͷ࡟‫ݮ‬͕‫ݟ‬ΒΕΔɻ
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ͯɼ2016 ೥Ҏ߱ͷϥϯʹ͓͍ͯ LHC ͷ‫͕͞౓ڧ‬Βʹ૿େͨ͠৔߹ʹ͓͍ͯ΋ɼߴ͍ pT ͷϛϡʔΦϯΛ‫ؚ‬ΉΠϕϯτΛɼᮢ஋Λอͬͨ··ޮ཰ͱམͱͣ͞औಘ͢Δ͜
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͍ͯΔɻͪ͜Β͸ 2016 ೥தʹ࣮ࡍʹಋೖ͞ΕΔ༧ఆͰ͋Δɻ

ͰͷΈෆࣗવʹτϦΨʔϨʔτ͕ߴ͍͜ͱ͕Θ͔ͬͨɻ

TGC Ͱൃߦ͞ΕΔ L1 τϦΨʔ͸ɼͦΕ͕িಥ఺͔ΒདྷͨϛϡʔΦϯͰ͋Δ͜ͱΛԾఆͯ͠ଌఆཻͨ͠ࢠͷ֯౓ʹ‫͞ߦൃ͍ͯج‬Ε͍ͯΔ͕ɼৄࡉͳௐࠪͷ݁Ռɼਤ 14தͷ੺͍໼ҹͰࣔͨ͠Α͏ʹɼ͜ͷ༨෼ͳ‫د‬༩͸ϛχϚϜόΠΞεͳͲͷιϑτͳ൓ԠͰࢄཚ·ͨ͸ੜ੒ཻͨ͠
ࢠ͕τϩΠυ࣓ੴपลͷϏʔϜύΠϓͰ௿଎ͷཻࢠΛੜ੒͠ɼͦΕΒ͕࣓৔Ͱ‫͛ۂ‬ΒΕͯɼͨ·ͨ·ߴ͍ pT ͷϛϡʔΦϯͱಉ֯͡౓Ͱ‫ݕ‬ग़‫ʹث‬ඈͼࠐΈɼτϦΨʔΛൃߦͯ͠͠·͏ͱ͍͏ࣄ৅Ͱ͋Δɼͱཧղ͞Εͨɻͭ·Γɼিಥ఺͔ΒͷϛϡʔΦϯͷΈΛબ୒ͯ͜͠ͷഎ‫ࣄܠ‬৅Λഉআ͢ΔͨΊʹ͸࣓৔ΑΓ΋಺ଆͷ‫ݕ‬ग़‫ ͱث‬TGCʹಉ࣌ʹ৴߸͕͋Δ͜ͱΛཁ‫͢ٻ‬Ε͹Α͍ɻͦ͜Ͱզʑ͸ɼτϩΠυ࣓ੴͷ͙͢಺ଆʹઃஔ͞Εͨ

”TGC-FI” ͱ֎૚ TGC ͱͷίΠϯγσϯεϩδοΫΛ
Run2 ͰͷΞοϓάϨʔυͱͯ͠ಋೖͨ͠ɻ͜ͷ࣮૷ʹ͸ɼ৴߸ॲཧϘʔυͳͲͷϋʔυ΢ΣΞ্ͷमਖ਼͕ඞཁ
Ͱ͋ͬͨͨΊ΍΍͕͔͔͕࣌ؒͬͨɼ࠷ऴతʹ͸ 2015೥ͷ 9 ݄ॳΊʹίϛογϣχϯά͕‫ྃ͠׬‬ɼ಺෦ίΠϯγσϯεΛՔಇͤ͞Δ͜ͱ͕Ͱ͖ͨɻਤ 15 ͸ͦͷ‫ޙ‬औಘͨ͠σʔλʹ͓͚Δ L1 ϛϡʔΦϯτϦΨʔͷ η ෼෍
Ͱ͋ΔɻFI ‫ݕ‬ग़‫ث‬ͷ͋Δ 1.3 < η < 1.9 ͷྖҬͰେ͖ͳϨʔτ࡟‫͕ݮ‬ಘΒΕͨ͜ͱ͕Θ͔Δɻ͜ͷվળʹΑͬ

3.2.3

L1Calo τϦΨʔ

L1 τϦΨʔʹ͸ϛϡʔΦϯͷଞʹΧϩϦʔϝʔλ͔Βͷ৴߸ʹΑΔτϦΨʔ΋ଘࡏ͠ɼϋʔυ΢ΣΞ্ͰͷॲཧͰɼి࣓γϟϫʔɼδΣοτͳͲͷτϦΨʔΛൃߦ͢Δɻ͜ͷͱ͖ɼফࣦԣํ޲ΤωϧΪʔ (Missing ET,

MET) τϦΨʔʹ͍ͭͯ͸Ϩʔτ͕ϧϛϊγςΟʔʹൺྫͤͣɼࢦ਺ؔ਺తʹ૿େͯ͠͠·͏ɼͱ͍͏໰୊͕
Run1 Ͱ‫͍͔ͨͯͬͭݟ‬ɻ͜Ε͸ɼ͋Δࣄ৅͕࿈ଓ͢ΔόϯνதͷͲͷҐஔʹଐ͢Δ͔Ͱ৴߸ͷϕʔεϥΠϯ (ϖσελϧ) ʹର͢ΔύΠϧΞοϓͷޮՌ͕େ͖͘มԽ͢
Δ͜ͱ͕‫ݪ‬Ҽͩͬͨɻ͜Εʹରͯ͠ɼόϯνҐஔΛߟྀͨ͠ϖσελϧͷิਖ਼Λ Run2 Ͱಋೖͨ݁͠Ռɼਤ 16ͷΑ͏ʹύΠϧΞοϓʹΑΔޮՌ͸େ͖͘࡟‫͠ݮ‬ɼMET
τϦΨʔ͸΄΅ϧϛϊγςΟʔʹൺྫ͢Δͱ͜Ζ·Ͱվળͨ͠ɻ͜ΕʹΑͬͯࠓ‫ޙ‬ϧϛϊγςΟʔ͕͞Βʹ޲্ͨ͠৔߹ʹ͓͍ͯ΋ਫ਼౓ͷߴ͍ L1Calo τϦΨʔΛఏ‫ڙ‬͢Δ͜ͱ͕Մೳʹͳͬͨͱ‫͑ݴ‬Δɻ

8
266
8

4 ͓ΘΓʹ
4 2016͓ΘΓʹ
೥ɼLHC ͸ॏ৺‫ܥ‬ΤωϧΪʔΛ 13 TeV ʹอͬ
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cm Λ
ͨ··ɼ૯όϯν਺͸΄΅࠷େͷ2016 ೥ɼLHC ͸ॏ৺‫ܥ‬ΤωϧΪʔΛ
TeV∗2015 ೥ʹ‫ݟ‬ΒΕͨ໰୊ʹ͍ͭͯ໨ࢦͨ͠վྑΛߦ͏ɻ
2748ɼβ ͸ 40 cm Λ
ͨ··ɼ૯όϯν਺͸΄΅࠷େͷscrubbing ͷ‫ؒظ‬Λे෼ʹ͸΄΅ղܾͨ͠ͷͰɼྫ͑͹2015 ೥ʹ‫ݟ‬ΒΕͨ໰୊ʹ͍ͭͯ໨ࢦͨ͠վྑΛߦ͏ɻ
2016 ೥
औΔ͜ͱͰૣ‫ʹظ‬ϧϛϊγςΟʔΛ্͍͖͛ͯɼ͸΄΅ղܾͨ͠ͷͰɼྫ͑͹ scrubbing ͷ‫ؒظ‬Λे෼ʹ
34

−2 −1

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2016 ೥
औΔ͜ͱͰૣ‫ʹظ‬ϧϛϊγςΟʔΛ্͍͖͛ͯɼ
−1
34
−2
−1
25 fb ఔ౓ʹͳΔ༧ఆΕʹΑͬͯಘΒΕΔσʔλྔ͸
1 × 10 cm s Λୡ੒͢Δ͜ͱΛ໨ࢦ͢ɻ͜
தʹ͸Ͱ͋Δɻ͜Ε͸΋͸΍ඇৗʹָ‫؍‬తͳ༧ଌɼͱ͍͏Θ͚
25 fb−1 ఔ౓ʹͳΔ༧ఆΕʹΑͬͯಘΒΕΔσʔλྔ͸Ͱ΋ͳ͍ͷͰɼ2016 ೥ͷσʔλͰ෺ཧଌఆͷ‫౓ײ‬΋େͰ͋Δɻ͜Ε͸΋͸΍ඇৗʹָ‫؍‬తͳ༧ଌɼͱ͍͏Θ্͚͖͕͘Δ͜ͱ͕‫ظ‬଴͞ΕΔɻͰ΋ͳ͍ͷͰɼ2016 ೥ͷσʔλͰ෺ཧଌఆͷ‫౓ײ‬΋େATLAS ଆͱͯ͠͸ TileCal Λ༻͍ͨ಺෦ίΠϯγσ্͖͕͘Δ͜ͱ͕‫ظ‬଴͞ΕΔɻ

[9] G. Iadarola et al., ʠ Electron Cloud E ects ʡ,
These
Pro- ceedings,
LHC Performance
Work[9] G.
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ʡ,shop,
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D. Jacquetal.,ʠ Injection
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EventDisplayRun2Physics[12] https://twiki.cern.ch/twiki/bin/view/AtlasPublic/EventDisp[13] ੜग़लߦɼా‫ۼ‬༸հɼߴΤωϧΪʔχϡʔεɼ33ɼ
61 (2014)[13] ੜग़लߦɼా‫ۼ‬༸հɼߴΤωϧΪʔχϡʔεɼ33ɼϯεͷίϛογϣχϯάΛਐΊɼϛϡʔΦϯτϦΨʔͷATLAS ଆͱͯ͠͸ TileCal Λ༻͍ͨ಺෦ίΠϯγσ
ޮ཰Λམͱ͞ͳ͍Α͏ɼ૿େ͢ΔϧϛϊγςΟʔʹରԠϯεͷίϛογϣχϯάΛਐΊɼϛϡʔΦϯτϦΨʔͷ

61 (2014)[14] ”Study of the mechanical stability of the AT-

͢Δɻ·ͨଞͷτϦΨʔʹؔ͢ΔΞοϓάϨʔυͱͯ͠ޮ཰Λམͱ͞ͳ͍Α͏ɼ૿େ͢ΔϧϛϊγςΟʔʹରԠ
L1 Ͱෳ਺ͷΦϒδΣΫτಉ࣌ͷτϙϩδʔΛߟྀͨ͢͠Δɻ·ͨଞͷτϦΨʔʹؔ͢ΔΞοϓάϨʔυͱͯ͠

B-Layer”, stability
ATL-INDET-PUB[14] LAS”StudyInsertableof the mechanicalof the AT2015-001
LAS Insertable B-Layer”, ATL-INDET-PUB-(”L1Topo”) Λಋೖ͠ɼ͞ΒͳΔϨʔτ࡟‫ͱݮ‬τϦΨʔ
L1Ͱෳ਺ͷΦϒδΣΫτಉ࣌ͷτϙϩδʔΛߟྀͨ͠ॏཁͳ෺ཧࣄ৅ʹର͢Δ‫্޲౓ײ‬Λ໨ࢦ͍ͯ͘͠ɻ
τϦΨʔ (”L1Topo”) Λಋೖ͠ɼ͞ΒͳΔϨʔτ࡟‫ͱݮ‬
LHCɼATLAS ࣮‫ؔ͢ʹݧ‬Δ࠷৽৘ใ͸ɼATLAS ೔ॏཁͳ෺ཧࣄ৅ʹର͢Δ‫্޲౓ײ‬Λ໨ࢦ͍ͯ͘͠ɻ
[19]ɼΦϑΟγϟϧϒϩά
[20]ɼπຊάϧʔϓͷαΠτ
LHCɼATLAS ࣮‫ؔ͢ʹݧ‬Δ࠷৽৘ใ͸ɼ
ATLAS೔

2015-001[15] ATL-PHYS-PUB-2015-018

Πολʔ [21] ͳͲͰൃ৴͍͖ͯ͠·͢ͷͰͦͪΒ΋ੋ[19]ɼΦϑΟγϟϧϒϩά [20]ɼπຊάϧʔϓͷαΠτ
ඇ͝ཡԼ͍͞ɻ
[21] ͳͲͰൃ৴͍͖ͯ͠·͢ͷͰͦͪΒ΋ੋΠολʔඇ͝ཡԼ͍͞ɻ

ࢀߟจ‫ݙ‬
ࢀߟจ‫ݙ‬[1] ాத७ҰɼߴΤωϧΪʔχϡʔεɼ33ɼ245 (2015)[15] ATL-PHYS-PUB-2015-018[16] ੴ໺խ໵ɼߴΤωϧΪʔχϡʔεɼ26ɼ304 (2008)[16] ੴ໺խ໵ɼߴΤωϧΪʔχϡʔεɼ26ɼ304 (2008)[17] https://twiki.cern.ch/twiki/bin/view/AtlasPublic/
L1MuonTriggerPublicResults[17] https://twiki.cern.ch/twiki/bin/view/AtlasPublic/
L1MuonTriggerPublicResults[18] https://twiki.cern.ch/twiki/bin/view/AtlasPublic/
L1CaloTriggerPublicResults[18] https://twiki.cern.ch/twiki/bin/view/AtlasPublic/
L1CaloTriggerPublicResults[19] http://atlas.kek.jp,
https://sites.google.com/site/lhcpr2011[19] http://atlas.kek.jp,[1] ాத७ҰɼߴΤωϧΪʔχϡʔεɼ33ɼ245 (2015)[2] খྛ෋༤ɼߴΤωϧΪʔχϡʔεɼ28ɼ270 (2010)https://sites.google.com/site/lhcpr2011[20] http://d.hatena.ne.jp/lhcatlasjapan[2] খྛ෋༤ɼߴΤωϧΪʔχϡʔεɼ28ɼ270 (2010)[3] ۙ౻‫ܟ‬ൺ‫ݹ‬ɼߴΤωϧΪʔχϡʔεɼ27ɼ163[20] http://d.hatena.ne.jp/lhcatlasjapan[21] https://twitter.com/lhcatlasjapan(2010)
27ɼ163[3] ۙ౻‫ܟ‬ൺ‫ݹ‬ɼߴΤωϧΪʔχϡʔεɼ[21] https://twitter.com/lhcatlasjapan(2010)[4] http://lhc-commissioning.web.cern.ch[4] http://lhc-commissioning.web.cern.ch[5] ”Startofrun2
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at(LHC)”,the
https://cds.cern.ch/record/2020852
Large
HadronCollider(LHC)”,
https://cds.cern.ch/record/2020852[6] https://twiki.cern.ch/twiki/bin/view/AtlasPublic/[6] LuminosityPublicResultsRun2
https://twiki.cern.ch/twiki/bin/view/AtlasPublic/
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theirFast
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T. Baer
it etBeam,al., ”Very
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lating LHC Beam,their Mitigation and MachineProtection”, CERN-THESIS-2013-233[8] D. Mirarchi et al., ʠ LHC aperture and ULO
areal.,
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a possible
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and ULO[8] restrictions:D. Mirarchi et
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