19Ǥ ٥֋ࣅѻOVAL ߹‫— ٲ‬ऐ‫׸‬ʦ੾ʟ—ୱ֣੒Ӂ๲Ӂ‫ذ‬٥֋ѕᎴॠ
xfan@icepp.s.u-tokyo.ac.jpୱ֣੒Ӂ๲Ӂ‫ذ‬٥֋ѕࣘз࠹ॠkamioka@icepp.s.u-tokyo.ac.jpୱ֣੒Ӂ৔ຆޫഅ๲܎‫ݘ‬٥֋˂˺ˆƟ௔ఉ ࡨฯnaniwa@icepp.s.u-tokyo.ac.jp
2017 ௰ (ചढ़ 29 ௰) 5 ُ 18 ௟ʫ˺ˏ˴ˇʶʾˮ˺1ॽʃʜɟɷɳƆऐ‫׸‬ɿʃъʖɾɟɷɳƆˤ˺˞ɻऐ‫׸‬

e

ALPe

ωɡɫɺ, ݂‫ڤ‬ʂʆɼɸʊʂ‫ޫٵ‬ʒɻࠟʞࡥɫɺɫʒɜ
ʄɞɫʒɘ, ъʖɾɫ, ɼɘɚ‫ۉ‬ɯɾ॓ҏƆɼɧʡɠ, ݂‫פ‬ʃ॓ગचɘ॓ʂયɻɖʟƆΔ‫ܒ‬ʯ˔˲ʵƟɻɖʟɼɟ,߸ຟ१ढ़ɻɖʟɼɟ, ʓʧɾഇɟʝɾɘɧɼʘ঑෗ɠ෣ୢɾɧɼɠɖʠʄ, ‫ۂ‬ɡൗ੕ɿऐ‫׸‬ɿɱʂ঄ʦЬɫɸɥʟʜɚɿɾɷɺɫʒɷɳƆɫɟʖ‫ܟ‬ɷɳɧɼɿ, ˙ˊʷ

BBϔ઱ʂʫ˺˜˳Ɵʾˮ˺ɻɖʟɼɟ, ˙ˊʷˀࣟɿʜʟ

य 1: щ২୊ޫ๐୊ޫ਻ʦ‫ر‬ศɫɳऐ‫׸‬ഫ‫)ܳ( ׎‬ƆALPʦ‫ر‬ศɫɳഫ‫ڶ‬ബш (ϓ)Ɔˀຆޫɠ౎٪ɩʠɺɫʒɷɳƆ˙ˊʷˀࣟʂߢ౎ଯ਻ࣁ
ड़ʂఌʠɿʜɷɺऐ‫׸‬ɠ৷ୃΫɫ, ऐ‫׸‬Ճਿખɠ१ɬɳۚਏɻɖʟƆຟޫࣟʂ๲໱ɻɖʟ QED ɿɞɘɺ, ऐ‫׸‬ɾɽɼɘɚʴˍ˳ˋɾ໴ɠ߹‫ٲ‬ɻҷ௨ɩʠɺɫʒɷɳʂʃщ২ଯɿຆޫɼ౞ຆޫʂ਻ɠ१ɬɺʃࢶɜɺɘʟƆ୊ɻɖʟƆɧɚɾɷɺɫʒɷɳΙࣘ, ‫ޞ‬൘ɠɾɘ, ʖɚࢢѤʦߖɸຆޫɻ݂ʖ‫ػ‬ɘʂʃ୊ޫɻɖʟɳʕ, ߹߸ଯɿɫʒɬʕɿऐ‫׸‬ʦ૛ʍʟɟɼɘɚʂɠඕ߹‫ٲ‬ʂஓՆɻ୊ޫɼ๐୊ޫʦ۪ɜʟƆщ২ଯɿ१ɬɳ୊ޫ๐୊ޫˡʩɖʟƆʃ, τюɩʠɳ୊ࣟʘߞࣟʂϳׄʦࠬɥ, ऐ‫׸‬ʂ୊ߞఉOVAL ߹‫ — ٲ‬Observing VAcuum with Laser —[1]ʃ, ɱʂ෕ʂ૳ʞ, ऐ‫׸‬ʦ˳ƟʽƟɻ૛ʍʟƆɳɴɫ, ੺ɿ਻ɭʟۚਏʦബшɩɯʟ (य 1 ʂܳ)Ɔɧʂ‫࣐ټ‬ʃऐ‫׸‬ഫ‫׎‬ɼ‫څ‬ʄʠʟ [2]Ɔऐ‫׸‬ഫ‫׎‬ʂ੒ɡɩʃτюߞࣟʂ൘ɿऐ‫׸‬ɿ˳ƟʽƟʦ૳ɫɳɴɥɻʃъʖࡥɺɧɾɘƆധ‫ڽ‬ɿʜʞΪ൘ड़ʦߖɸɳʕ, ऐ‫׸‬ʂ‫؁‬঍๻ʂΪ൘ड़, ɭ୘, ऐ‫׸‬ʦ໵ʒɯɺ, ۚਏʦωɡɮʞࡥɭ಩์ɠɖʟƆʣɾʣɵऐ‫׸‬ʂ೾‫؁‬঍ɼɫɺԘਗɻɡʟƆߞࣟɿച۱ɾ൘ʠʣʠʂʷ˲Ɵ˞ʃɱʂɳʕɿֲߞࣟʦ๭ๆɭʟƆഅड़߹‫ٲ‬ɾɽɻʃ, ֲߞࣟɿʜɷɺഅ߸ʦˤ˺˞ɫɺ, ɱʠɿ਻ɭʟ౞Ыʦ˳ƟʽƟɻ˞˴Ɵ˝ɭʟɼɘɚˤ˺˞Ɖ˞˴Ɵ˝߹‫ٲ‬ʦ۱ɚɠ, OVAL ߹‫ٲ‬ʃɘʣʄऐ‫׸‬ʂˤ˺‫ڽ‬ɼळ૥ɾ൘‫ڽ‬ʂ‫؁‬঍๻ʂܴʃಒ࣢ɿʣɮɟɻɖʟɠ,∆n===OVAL ߹‫ٲ‬ɻ٪ɜʟʖʂֲߞࣟɻˤ˺˞ɩʠʟऐ‫׸‬ʂۚਏɼʃъɻɖʡɚɟƆɭɤɿްɘ೒ɣʂɠຟޫ୊ߞຢӁ (QED) ʂಾɣऐ‫׸‬ʂ(1)2 3˞Ɖ˞˴Ɵ˝߹‫ٲ‬ɻɖʟƆ

1.1n∥ − n⊥2α h̄B215µ0 m4e c5"2!
B[T]
4.0 × 10−24
1[T]

(2)
(3)

ɼ‫ޔظ‬ɩʠɺɘʟ [3]ƆΙч, ೾‫؁‬঍ʂ‫ॅؙ‬ɼɫɺ, kvac ≡4.0 × 10−24 [T−2 ] ɼટɣƆʒɮʃɧʂ QED ʂऐ‫׸‬ʦ٪ʟɧɼɠ OVAL ߹‫ٲ‬ʂ੓λෳವɻɖʟƆ

210ʖɵʡʧ, QED Ιҙʂऐ‫׸‬ɻɖɷɺʖ, ߞࣟɿࠜɣٌOVAL ߹‫ٲ‬2‫܄‬ɭʟࣟɻɖʠʄ OVAL ߹‫ٲ‬ɻԘਗя௾ɻɖʞ, ವࡵ๲໱ʦ૝ɜɳࣟʘຆޫʦ੾‫ݲ‬ɻɡʟƆ੒ɡɣഇɥɺ, щ২ຆޫ਻१ढ़ɿʜɷɺऐ‫׸‬ഫ‫׎‬ʂ‫ڹ‬їʦ१ʔࣟ‫( ܄‬य 1ʂܳʂ e ʦරગຆޫɻટɡԀɜɳʖʂ) ɼ, ‫ޫڶ‬ɠщ২変動磁場(パルス磁石)
変動磁場(パルス磁石)
レーザー
レーザー

偏光子(縦,P))
偏光子(縦, P

偏光子(横,A))
偏光子(横, A
変化した
変化した
偏光成分
偏光成分

યड़ຆޫʂયԝࣨੁʦ‫ر‬ʟࣟ‫( ܄‬य 1 ʂϓ) ʂ௖ɸʂԺิɠ۪ɜʝʠʟƆঽࠋʃλ౫ଯɿ˦˱ˈ˪Ɵʿːຆޫ

光共振器
光共振器

ɼ‫څ‬ʄʠ, ‫ޫڶ‬ɼʂٌ‫܄‬ʂֲɩʦຆޫʂߖɸಘࢡ୊Ѥʂ੒ɡɩɿટɡԀɜɺ, ੾‫ݲ‬ɩʠɺɘʟƆ‫ࠋڤ‬ʂ੐಺ଯɾ

元の元の偏光成分
偏光成分

य 2: OVAL ߹‫ٲ‬ʂҞ௱यƆʖʂɼɫɺʃʩʶʾʱ˺ɠ֘ɦʝʠʟɠ, યड़ʂաˀʲ˰Ɵ, ɖʟɘʃˀʲ˰Ɵຆޫɿԟɫɺʃ, ʩʶʾʱ˺โOVAL ߹‫ٲ‬ʂҞ௱यʦय 2 ɿߟɭƆߧ (3) ɟʝഇɟຆޫ (Axion Like Particle, ALP) ɼ‫څ‬ʄʠ, ߹‫߳ٲ‬ɻʟ૳ʞ, QED ɿʜʟऐ‫׸‬ഫ‫׎‬ʂ‫ڹ‬їʃಒ࣢ɿಘࠜɻɖ

ALP ʦ੾‫ݲ‬ɭʟ‫ݘ‬ʂࠞ์ɾ൘൚ʂλɸɻɖʟ [4]Ɔʞ, ɱʂਗ଑ʂɳʕɿʃӽ୞‫ࣘڽ‬ʂɳʕʂ‫ۆ‬೔ɠ಩์ɻɖʟƆɱɧɻ, ɧʂ߹‫ٲ‬ɻʃബஓߞࣟʦๆɘʟƆ‫ޫڶ‬ʂഫ1.2ऐ‫׸‬ഫ‫׎‬Ԙਗʂ‫ࣨټ‬QED ऐ‫׸‬ʂഫ‫׎‬ʂਣ‫ݚ‬ʃ 20 ॓Տʂʃɬʕɟʝา‫ٿ‬ɩʠɺɘɳɠ, ٠࣍ɿʃಒ࣢ɿֲຢɾ୊ߞࣟɠ಩์ɻɖʟƆɧɚɘɷɳࣟ‫܄‬ʂ଑౵? ʂʆɼɸʃ, ଼ਹʂ๭ๆɻɖʟƆऐ‫׸‬ഫ‫׎‬ʂࠡɠɟʞʦ੾ɭ߇ʓɼɫɺ, ʺ˺˘ʶˏ଼ਹʂ࣏‫ݔ‬Ԙਗɠɞɧɾʣʠɺ๝ɳƆɱʂٌї, ɸɘ݂‫פ‬ɿɾɷɺ, RX J1856.5–3754 ɼ‫څ‬ʄʠʟࠚɘયड़ޫॠ (B ∼ 109∼10 [T] ɼव଑ɩʠʟ) ʂԘਗɟʝऐ‫׸‬ഫ‫ڶ‬ബшʦ٠ࡥɭʟɳʕɿʃഫ‫ޫڶ‬ʦ๭ๆɭʟɠ, я߄/অҙມηʂഫ‫ޫڶ‬ʂ૥ভഫ‫ڶ‬ʂ‫ڶ‬ɿ਻ɭʟষ੝ड़௾ (2 ච૥‫ڱ‬ɫɺజટɫɳɼɡɿɽʠɴɥ‫ڶ‬ʦࠎʟɟʂખɻ, ࢶ‫ڶ‬ಅɼ‫څ‬ʄʠʟ) ʃɯɘɰɘ 10−7 ੑଟ୞ɻɖʞ, ɧʠΙчʂಘࢡɾഫ‫ڶ‬ʃ౜ധɻɡɾɘƆτюߞࣟʦബஓɩɯʟɧɼɻ, ߞࣟɿΜਣɫɳഫ‫ڶ‬ബшʂʓʦࠟʞࡥɭɧɼɠя௾ɿɾʟƆPVLAS ʷ˲Ɵ˞ɻʃ, 2.5 [T] ʂϷռߞॿʦ‫ޡ‬ๆɭʟɠ, ߞॿʦѾୃɩɯɺߞࣟʂτю൘‫ڽ‬ʦബɜʟɧɼɻഫ‫ڶ‬ബшʦળࡥɫɺɘʟƆɧʠɿ਻ɫ, ʣʠ‫׎‬ʂ‫ڹ‬їɠ٪ɜɳɼɘɚൎ‫܍‬ɠढ़ɩʠɺɘʟ [5]ƆVeryʣʠ OVAL ߹‫ٲ‬ɻʃ, ˘˲ˀߞॿ (ෳವֲ୞ 15 [T] ૝)

Large Telescope ɿʜʟ‫ڶ‬ӁԘਗɼ, ʾ˦ˬ˳Ɵʾˮ˺
ɿʜʟ QED ऐ‫׸‬ഫ‫׎‬ɖʞ/ɾɫ˩ˎ˲ɼʦಅҼɫɳٌї, ऐ‫׸‬ഫ‫׎‬ɖʞ˩ˎ˲ʂ൘ɠʜʞԘਗɼ‫܄‬ઠɫɺɘʟइԶ) ɼߞॿʦ৕ʓ‫܄‬ʣɯɺ‫ޡ‬ๆɭʟƆऐ‫׸‬ഫ‫׎‬ɿʜʟɼʂɧɼɻɖʟƆಒ࣢ɿ‫׀‬යऍɘٌїɻɖʞ, ‫ڤܞ‬ʂԘਗˎƟˆʂࡑ߹ɠ൷ʒʠʟƆλ൘, ઘࣘ߹‫ٲ‬ɻऐ‫׸‬ഫ‫׎‬ʦ٪ʜɚɼɘɚ߇ʓʖ୻ীʦ๭ๆɫɺߞֲࣟ୞ߢਹʦബшɩɯʟƆʖɚʆɼɸʂ‫ۆ‬೔ɼɫɺ, ‫ڶ‬ʂ֩इԶ (Fabry-Pérot ֩ഫ‫ڶ‬ബшʃߞࣟʦτюɫɳ֜๸ɿಅຶɫɺ੒ɡɣɾʟɳʕ, ɾʟʍɣૠɘ֜๸ɿ୔ɷɺߞࣟʦτюɭʟɧɼɠ࡚์ɻɖʟƆ౞ࠄ๻ɠ 99.999% ʦ૝ɜʟˀƟ˘Ɵ˦˰ƟɞɧɾʣʠɺɘʟƆ‫॓ݚټ‬ҏʂˏˊ˞ʦਃɷɺɘʟʂʃ

ʦ‫܄‬ʣɯ‫׃‬ɼɫɺ๭ๆɭʟɧɼɻ, ‫ڶ‬ʦ߹‫ڹ‬ଯɿॅࡒඵ

ʫˆ˱ʩ INFN ʂ PVLAS ɼɘɚʷ˲Ɵ˞ɻɖʟ [6]ƆѾଟ୞Ъ೹ɩɯʟɧɼɠɻɡʟƆɧʂЪ೹ɫɺɘʟೱഇ߹ʃɧʂʷ˲Ɵ˞ʃ 2006 ௰ɿऐ‫׸‬ഫ‫׎‬ʦ౎٪ɫɺɘʟ[7]Ɔɱʂ੒ɡɩʃ QED ʂา‫ٿ‬ખʜʞʖ 3.5 ‫ن‬ʖ੒ɡɘɳʕ, ʩʶʾʱ˺ʂʜɚɾර౎٪ຆޫʂ‫ڹ‬їɻɖʡɚɼ۪ɜʝʠ, PVLAS ʷ˲Ɵ˞ʂʓɾʝɮ, ॓ҏયʂਪɣɿߞࣟʦτюɭʟɧɼɻ, ૳ѬʂѾॅɠɱʂʒʒӽ୞ʂ‫ࣘڽ‬ɿɸɾɠʟƆɧɧɻ෻੕ʃ, ɧʠʝʦ৕ʓ‫܄‬ʣɯɺϬୃɻɡʟʂɟɼɘɚ୅ɻɖʟƆֲߞࣟ˘˲ˀߞॿʘ‫˜ۿ‬ʪ˔ˀʂ֩इʂʷ˲Ɵ˞ɻ૰٠࣍߹‫ٲ‬ɠɞɧɾʣʠɳƆɱʂٌїʃ‫ޝ‬Զɾɽ߹‫ٲ‬ʂ‫ڃ‬ധ์৔ʃՂɿ॓ʂયɿࡥѾɷɺɘʟʖʂ

௱ɾɠʝ PVLAS ʷ˲Ɵ˞ߢङɻʖʏɟʂʷ˲Ɵ˞ɻɻ, ɱʠʏɽ૨ɫɘʖʂɻʃɾɘƆɳɴɫ, ˘˲ˀߞॿʖ݁‫ټ‬ɻɡɮ, ౎٪ʃ‫ڬ‬ൎɼɘɚٌ໱ɿ߃ɷɳƆPVLASʂʜɚɾฅ౹? ɾՠࡦɼ, ‫˜ۿ‬ʪ˔ˀ֩इԶɼɘɚ‫ۿ‬ɘʷ˲Ɵ˞ʃɱʂ‫ڤ‬ʖӽ୞‫ࣘڽ‬ɼ˕ʫˁଊ‫ٹ‬ʌʂଢ଼ຢʦਞ३୞ʂ಩์ɾՠࡦʦ৕ʓ‫܄‬ʣɯɺ‫ޡ‬ๆɫɺɘʟຶʃ॓ʂɥ, ‫ݚټ‬ʃ QED ʂา‫ٿ‬ખɿ਻ɫɺ, ɖɼ 20 ఝɼɘɚɼયɿʏɼʧɽɾɘƆɱɧɻʣʠʣʠʃ, ʒɮʃɭɤɿࠡɧʡʒɻ੾‫ݲ‬ɫɺɘʟƆʒɳ, ӽ୞ɿɞɘɺʃ PVLASʷ˲Ɵ˞ɿʃտʄɾɘɠ, ˜˰˺ˀʂ BMV ʷ˲Ɵ˞ʖஔโɿऐ‫׸‬೾‫؁‬঍ʂ੾‫ݲ‬ʦɞɧɾɷɺɘʟ [8]Ɔɧʠʝɿ௡ʟ์৔ɻ˞˴ˏˆʫ˞ʂ˂ˊˏʩˊ˞ʦ६‫ݩ‬ɫ, ৕ʓ‫܄‬ʣɯɺϬๆɭʟɧɼɻ OVAL ߹‫ٲ‬ʂুਹʂ٠࣍ʦɞɧɾɷɳƆ֨‫܄‬ʷ˲Ɵ˞ʜʞগɿ QED ɿʜʟऐ‫׸‬ഫ‫׎‬ʦ٪ɸɥ,ɩʝɿʃරગຆޫʂ੾‫ݲ‬ʖɞɧɾɞɚɼɘɚʂɠʣʠʣʠʂ OVAL ߹‫ٲ‬ʂෳଯɻɖʟƆ

2.1˞˴ˏˆʫ˞ʂ˂ˊˏʩˊ˞य 3 ʂࣘɿ˞˴ˏˆʫ˞ʂ˂ˊˏʩˊ˞ʦ, य 3 ʂчɿɱʂࠃऐʦߟɭƆ

311真空容器
真空容器

ɼಅҼɫɺʖɮɷɼ੒ɡɾખɻɖʟƆ

磁気シールド磁気シールド˘˲ˀߞॿʃুਹɠЂਹફ৔ɿʜɷɺືնɩʠɺɞʞ,

パルス磁石
パルス磁石

ߞॿʂືն௾ຢɻ،ʞറɫʂ೎୞ɠ‫ى‬ʒɷɺɘʟƆ‫ܞ‬Ѿ
ʃ, 9.0 [T] ˘˲ˀɟʝߘʂ 9.0 [T] ຸߞʒɻʂ 1 Ѿʂʼʫʶ˲ʃ 10 ೀ࠵ՃɻϬୃɫɳƆɾɞ, ˘˲ˀߞॿɞ
真空ベローズ真空ベローズ

光学定盤
光学定盤

ʜʇɱʂ‫ױ‬ஓ୊‫ٺ‬ɿԟɫɺʂ࣏‫ݔ‬ʃ [9, 10] ʦ‫ࢻދ‬ɩʠɳɘƆ

床
床


80

70

パルス磁場の2 乗分布乗分布
パルス磁場の222B%(T7)


60

50

40

30

共振器の光の寿命で共振器の光の寿命でフィルターした形状フィルターした形状


20

10

0
í3

−

í2

−

í1

−

0
1


27LPH(ms)
PVTime


3


4


5
6

य 4: 9.0 [T] τюߗʂ˘˲ˀߞࣟ 2 ࣛʂߗԝഇ೘Ɔ߹ভɠ߹‫ݘ‬ɿ१ɬʟ B 2 , ఌভʃɱʠʦ֩इԶʂ˳ˀˤ˺ˀɻɖʟ‫ڶ‬ʂ࠮ූɻ˜ʪ˲ˆƟɫɳഇ೘ɻɖʟƆय 3: ˞˴ˏˆʫ˞ʂ˂ˊˏʩˊ˞ (ࣘ) ɼ߹‫ݘ‬ʂࠃऐ(ч)Ɔ
ਂટʂયШɿ˘˲ˀߞॿʦజટɫ, ຑ਑ɿ‫׃‬ʦટɘɺ˘˲ˀߞॿʂ߫ʦ૳ʟ֩इԶʦ৕ʔƆ˘˲ˀߞॿʃʣʠʣʠʂʷ˲Ɵ˞ɠҔ౎ɫɳʖʂɻ, 1 mm×3 mm ʂடʂചҺভʦ 15 ˆƟ˺ӳɘɳૠɩ 200 mm ʂ˳Ɵˀˏ˰ˊʶ‫ʺؠ‬ʫ˲ (L = 31 µH, RDC = 5 mΩ) ɻɖʟƆʺʫ˲ʂ௅਑ɿʃ 1/4 ʫ˺ˈʂˀˍ˺˳ˀ˘ʫ˞ʦ૳ɫɺɖʞ, ˘ʫ˞ɿʏʐळ૥ɿ 200 mm ɿʣɳɷɺߞࣟʦτюɭʟƆ௅ೱɿຸߞɩʠʟ˘˲ˀߞࣟʃ, ɧɵʝʖʣʠʣʠɠҔ౎ɫɳʺ˺ˎ˺ʼ˗˺ʶʌʂࡑ୊୊΄ɿʜɷɺ૛य़ɩʠʟƆ˞˴ˏˆʫ˞ਗ଑ɿɞɘɺʃ, ࡑ୊୊΄ʦ 2.0 [kV] ɿ঎଑ɫ, ݂੒˘˲ˀߞࣟ 9.0 [T] ɼպ‫ڽ‬ɡ˘˲ˀߞࣟ −4.5 [T] ʦ‫ڞڱ‬ɿτюɭʟ˩ƟːɻϬୃɫɳƆय 4 ɿ 9.0 [T] τюߗʂ˘˲ˀߞࣟʂ 2 ࣛഇ೘ʦߟɭɠ, ɞɞʜɱ˦˱ೀʂߗԝۚਏʦߖɸߞࣟɻɖʟƆɳɴɫ, ߹‫ݘ‬ɿഫ‫ڶ‬ബшɼɫɺʾʷˑ˲ɻԘਗɩʠ
ʟʂʃ, ‫ࡧڤ‬ɭʟ֩इԶ௅ʂ‫ڶ‬ʂ࠮ූɻ˴Ɵ˘ˀ˜ʪ˲ˆƟɠɟɟɷɳ‫ࣨآ‬ɼɾʟƆɱʂ‫آ‬ʖय 4 ɿɖʣɯɺߟɭƆ߹‫ٲ‬ɿɖɳɷɺʃ, ळ૥ߞࣟʂ 2 ࣛɼτюɫɺɘʟૠɩʦӆɥ‫܄‬ʣɯɳʖʂɠ࡚์ɼɾʟɠ, ਗ଑ɫɳߞࣟʂഇ೘ʦюයɫɺঀഇɭʟɼ, 9.0 [T] ʂ˛Ɵʶߗɿ! 2B (z) dz = 13.8 [T2 m] ɻɖɷɳƆɧʠʃ, ߹‫ڹ‬ଯɿʃ 9.0 [T] ʂ‫ה‬λߞࣟɠ 17 [cm] ɿʣɳɷɺτюɩʠɺɘʟɼɘɚɧɼɿɾʟƆɳɼɜʄஔɬ˘˲ˀߞࣟʦ๭ๆɫɺɘʟ BMV ʷ˲Ɵ˞ (ߞࣟ 6.5 [T], ૠɩ 13.7 [cm])˘˲ˀߞॿʦַʧɻ֩इԶɼ˳ƟʽƟ‫ذ‬ɠజટɫɺɖ
ʟƆ˳ƟʽƟʃ, Nd:YAG ‫چ‬ਹ˳ƟʽƟ (Coherent ࠉʂ Mephisto 500 NE, 1064 nm) ʦ˥ˀˆƟ˳ƟʽƟɼɫɺ‫ޡ‬ๆɫ, ഫ‫ ޫڶ‬P (ʾʷ˥‫ڶ‬Ն, α-BBO ʷ˰˺˳ƟʽƟ˞˱ˁ˧) ʦ૳ɫɺ૥ভഫ‫ڶ‬ɿɫɳढ़ഇʦ֩इԶɿ஖௡ɫɺɘʟƆ֩इԶʃ 2 චʂˀƟ˘Ɵ˦˰Ɵ, M1 ɼ

M2 (Advanced Thin Films ࠉ) ɟʝढ़ʞ, ຑ˦˰Ɵԝʃ
1.38 m ʂ֜๸ɠɖʟƆɧʂೱഇɿ˳ƟʽƟ‫ڶ‬ʦЪ೹ɩɯʟƆɳɴɫ, ֩इِࣥʦභɳɫɺɘɾɘࣟ‫܄‬, ֩इԶɿʃ‫ڶ‬ɠ௡ʝɾɘƆɧʂɳʕ, M1 ɿ௡ຢɫɳɼɡɿ౞ࠄɫɺɣʟ‫ڶ‬ʦ˩˒ˆƟɫ, PDH ൚ [11] ɼ‫څ‬ʄʠʟࠡ൚ɻ˥ˀˆƟ˳ƟʽƟʂಘࢡɾ࠵ఉॅബшʌɼ˜ʪƟː˗ˊʶɭʟɧɼɻ, Α଑ɫɳ֩इʦ੬ढ़ɫɺɘʟƆλ൘,֩इ‫ڤ‬ɿ M2 ʦ஌Ѭɫɳʣɮɟɾ˳ƟʽƟ‫ڶ‬ʃ‫ڤ‬ʡʂഫ‫ ޫڶ‬A (P ɼஔɬ६ೇ) ɿʜɷɺ௡ࠄ‫ڶ‬ɼஔɬഫ‫ڶ‬ʂ‫ڶ‬ɼळ૥ɾ‫ڶ‬ɿഇɥʝʠʟƆຑ൘ʂ‫ڶ‬ʃʾ˱ʺ˺˜ʰˏˇʫʱƟː (ೊࢱˢˏ˒ʶˀࠉ, S11499) ɿʜɷɺԘਗɭʟƆΙ‫ۼ‬, ௡ࠄ‫ڶ‬ɼஔɬഫ‫ڶ‬ढ़ഇʦ It , ळ૥ɾढ़ഇʦIe ɼɭʟƆഫ‫ޫڶ‬ʂࢶ‫ڶ‬ಅʃ P ɼ A ʂ৷਻Һ୞ʦബɜɺ It ɼIe ʂബшʦਗ଑ɭʟɧɼɻ߹ਗɻɡʟƆ௖ɸʂഫ‫ޫڶ‬ʦച۱ɿɫɳɼɡɼळ૥ɿɫɳɼɡʂ‫ڶ‬ʂಅɟʝ, 3×10−7ɻɖɷɳƆʒɳ, ֩इԶʂड़௾ʃ˜ʪ˔ˀɼ‫څ‬ʄʠʟ֩इʂЁɩɿʜɷɺɖʝʣɩʠʟɠ, ˜ʪ˔ˀʃ֩इʦֲक़ଯɿউɷɳ‫ڤ‬ʂ It ʂߗԝബш, ɭɾʣɵ֩इԶ௅ɿનঀɩʠɳ‫ڶ‬ʂ࠮ූɟʝֆʕʟɧɼɠɻɡʟƆ˜ʪ˔ˀʂ‫ݔ‬ɟɾખʃ˦˰ƟʂࣨੁɾɽɿΜਣɭʟɠ, ݂ʖຜɘِࣥʂɼɡɿ˜ʪ˔ˀ 670, 000 ଟ୞, ˞˴ˏˆʫ˞ਗ଑ߗ

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ɿʃ, ˜ʪ˔ˀʃ 350,000 ଟ୞ɻɖɷɳƆɧʂખʃ, ˳Ɵ

ʕ, 9.0 [T] ɼ −4.5 [T] ʂຑ൘ʂബшʦ٪ʟɧɼɻഇ๸ʽƟ‫ڶ‬ɠ֩इԶʂયʦ߹‫ڹ‬ଯɿช 20 ඵѾ (Ъ೹ 10 ඵɻɡʟƆय 5 ɿ˘˲ˀߞࣟτюߗʂ଺‫ؠ‬ଯɾ Ie /It ʂѾ) ૳ɷɳɧɼʦΤයɭʟƆഫ‫ڶ‬ʂബшʃߞࣟયʦ‫ڶ‬ɠఉ‫آ‬ʦߟɭƆஔߗɿ, ೾‫؁‬঍ʂ‫ڹ‬їɼ˜ʨ˰ˎƟ‫ڹ‬їʂ૳Ѭɫɳ֜๸ɿЫɬɺਊɜʟʂɻ, 20 ඵɠɱʂʒʒ֩इຑ൘ɟʝา২ɩʠʟ‫ڹ‬їʦ˜ʪˊˏɫɳٌїʖߟɭƆʾԶɿʜʟࣿ‫܃‬ʌʂʹʫ˺ɼɾʟƆɾɞ, ɧʂ˜ʪ˔ˀʃʷˑ˲ມηɿߞॿʂइஓɾɽɿʜʟ‫ڹ‬їʃ٪ʝʠɮ, ɡʏʐ॓ҏ݂‫ۿ‬शࡵɻɖʞ, PVLAS ʷ˲Ɵ˞ʂ˜ʪ˔ˀʠɘɿา২૳ʞʂʲƟ˝ʦߟɫɺɘʟɧɼɠʣɟʟƆ

700, 000 ɼಅҼɫɺʖਨࣸɾɘ˳ˠ˲ɻɖʟƆ୻ীɾɠʝ, ɧʂʜɚɾ‫ۿ‬ɘ˜ʪ˔ˀʂ֩इԶʃࣤ๥ɿಒ࣢ɿࠜɣ, ɵʛɷɼɫɳइஓʘ˜ʪƟː˗ˊʶ‫ذ‬ʌʂ˕ʫˁɻ֩इɠҙʠɺɫʒɚƆɧʂɳʕ, ֩इԶɼ˘
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˞˴ˏˆʫ˞ɻʂਗ଑

‫ܞ‬Ѿʂ˞˴ˏˆʫ˞ʂ˂ˊˏʩˊ˞ʂෳଯʃ, ਂટুਹʂஓ‫ݩ‬ҷ௨ɼ, үࠦ෻੕୅ʂথɘࡥɫɻɖʟƆऐ‫׸‬ʂ೾‫؁‬঍ʦਗ଑ɭʟɿʃӽ୞ɠ೑ਘɫɺɘʟɳʕ, ֩इԶ௅ɿషɘફ৔ʳˀʦࡑ଻ɭʟɧɼɻ, ߞࣟɿʜʟફ৔ʳˀʂˤ˺˞Ɖ˞˴Ɵ˝߹‫ٲ‬ʦɞɧɾɷɳƆɳɼɜʄફ৔ʳˀ 100 [Pa] ʦೲ௡ɭʟɼ, ऐ‫׸‬ʜʞʖ 8 ‫ن‬ʖ੒ɡɾ೾‫؁‬঍ɠՃਿɩʠʟɳʕ, ˞˴ˏˆʫ˞ʂஓ‫ݩ‬ҷ௨ʘ,ʾʷˑ˲ֲ୞ʂҷ௨ʂࣘɻಒ࣢ɿยๆɻɖʟƆɳɴɫ,അ߸ɿߞࣟʦɟɥɳࣟ‫܄‬ʃ, ೾‫؁‬঍ɴɥɻʃɾɣ, छ۱൘‫ڽ‬ɿച۱ɾߞࣟɿʜɷɺ˜ʨ˰ˎƟ‫ڹ‬ї (∝ B∥ ) ʖ१ɬʟƆʣʠʣʠʂ˘˲ˀߞॿ௅ʂ‫ر‬໚ʃߞࣟɿ਻ɫɺช

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窒素ガス圧力 >3D@[Pa]
窒素ガス圧力ʝɘʂਗ଑ɻ, QED ʂา‫ٿ‬ɭʟऐ‫׸‬ഫ‫׎‬ɠԘਗɻɡʟา଑ɻɖʟƆय 6: ફ৔ʳˀʂ΄ຢʦബɜɳɼɡʂ೾‫؁‬঍ʂ੒ɡɩ (B 2Μਣʂढ़ഇ) ʂബшƆ૥ভʃ˜ʪˊˏٌїʦɖʝʣɭƆ3ʒɼʕɼࢠ๝ʂฅ൷OVAL ߹‫ٲ‬ʃ, ˘˲ˀߞॿɼ‫˜ۿ‬ʪ˔ˀ˳ƟʽƟ֩इԶʦ৕ʓ‫܄‬ʣɯɺऐ‫׸‬ʂۚਏʦ੾ʟ߹‫ٲ‬ɻɖʟƆɧʂ˞˴ˏˆʫ˞ʂ಻ьɼ‫ڤܞ‬ʂา଑ഇฅɻʃʫˆ˱ʩʂ PVLAS ʷ˲Ɵ˞ɠগ۱ɫɺɞʞ,˞˴ˏˆʫ˞ɻʂફ৔ʳˀਗ଑ٌїʃ, ʏʐา଑૳ʞQED ʂา‫ٿ‬ɭʟऐ‫׸‬ഫ‫׎‬ʦ٪ʟʒɻ, ɖɼ 20 ఝʂɼɧʡʒɻ๝ɺɘʟƆɧʠɿ਻ɫ, OVAL ߹‫ٲ‬ʃֲຢɾ˘2.3ɻɖʞ, ݂੒ʂٝ௱ɻɖɷɳ֩इԶɼ˘˲ˀߞॿʂஔߗϬୃʖ෻੕ɾɣɞɧɾɚɧɼɠࡥ๝ɳƆɱɧɻ, ٠ࡥԶʂ‫ڤܞ‬ʂஃ੬ӽ୞ʦ‫ى‬ʕʟɳʕɿ, ऐ‫׸‬ɻʂ೾‫؁‬঍ਗ଑ʖɞɧɾɷɳƆ֩इԶ௅ʃ 10−3 [Pa] ʜʞʖຜɘऐ‫׸‬ʒɻఔՉɫ, ˘˲ˀߞॿʃ 100 ʼʫʶ˲ϬୃɫɳƆʣʠʣʠʂ˘˲ˀߞॿʃ،ʞറɫɠ৮ɘɳʕ, ুˎƟˆࠟணɿ์ɫɳߗԝʃ 15 ഇଟ୞ɻɖʟƆɱʂٌї, ˃˴ɼ෌෎ࡷɾٌїɻ,˲ˀߞॿʦ೭Զɿ˃˴ɟʝ߹‫ٲ‬ʦ๼ɵࣘɦɳɼɧʡɻɖ
ʟƆ˞˴ˏˆʫ˞ʂ६‫ݩ‬ɼϬୃɿʜʞ, ߹‫ٲ‬ʂӽ୞ɠ‫ظ‬ѳ૳ʞɻɖʟɧɼɠҷ௨ɻɡɳƆ˞˴ˏˆʫ˞ʂӽ୞ʃ
ʒɴʒɴ PVLAS ʷ˲Ɵ˞ɿʃտʄɾɘɠ, ਂટʂʩˊ˞ʷ˳Ɵːɿʜʞ, ‫ॅڤܞ‬௰ɻ PVLAS ʷ˲Ɵ˞ʦ૰ɘ౓ɡ, QED ऐ‫׸‬ഫ‫׎‬ʦ॓ҏɻࡾʕɺԘਗɫɳɘɼ۪ɜɺɘʟƆ޽٪ɼɫɺ೒ɥюɜʟɾʝ, QED ʂऐ‫׸‬ഫ‫׎‬ʂਗ଑−18kvac = (−0.5 ± 1.1) × 10[T−2](4)ɼɘɚખɠணʝʠɳƆߧ (3) ɼಅʍʟɼ, ʒɴɧʂખʃQED ʂา‫ٿ‬ખʜʞ 5 ‫ن‬Ιࣘӽ୞ɠਘʞɾɘƆɧʂӽ୞ܴʦඝʕʟ‫ߗټ‬୅ɻʂಈ‫ޔ‬ๆʃΙчʂ૳ʞɻɖʟƆʒɮʃ˘˲ˀߞॿʦֲɣɭʟƆPVLAS ʷ˲Ɵ˞ʂʜɚɾϷռߞॿɼβɷɺ, ୊ກʦਊʘɯʄߞֲࣟ୞ʦಅҼଯɳʘɭɣਊʘɭɧɼɠɻɡʟƆ‫ݚټ‬ʂߞॿɻʃ, 14 [T]ʒɻࡥɯʟɧɼɠҷ௨ɻɡɺɘʟɠ, ɧʠΙࣘʃভ‫ݛ‬ʂՆҌֲ୞ɠ೑ਘɫɺఌҀɩʠɺɫʒɚƆɧʂɳʕ, டভʃ, ɖɣʒɻʖವࡵ๲໱ʂ˞˴˂ˀɻɖʞ, ˠ˺ˈ˥ƟʶɿѬɢɾɘƆඕ୻ɿ٪ɳɘʖʂʃ, ɱʠʦ૝ɜɳগɿধʧɻɘʟƹъɟƺɻɖʞ, ɱʠʦෳ‫ޱ‬ɫɺӽ୞‫ࣘڽ‬ʦɞɧɾɷɺɘɡɳɘɼ۪ɜɺɘʟƆʣʠʣʠʂʷ˲Ɵ˞ʃ,OVAL ߹‫ٲ‬ʂʓɾʝɮ, XFEL ɾɽʂɩʒɪʒɾ‫ڶ‬ʂՠࡦʦๆɘɺऐ‫׸‬ʂۚਏʦ੾‫ݲ‬ɫɺɘʟ [10, 13]Ɔ˳ƟʽƟɿ੐಺ɩʠʟ‫ڶ‬ʂՠࡦʃɭɩʒɬɘਙɩɻछഽɫɺɞʞ, ‫ڤܞ‬ऐ‫׸‬ɿধʔۚਏʦ੾‫ݲ‬ɭʟࣘɻ੒ɡɾ೭Զɿɾʟɼ۪ɜɺɘʟƆʦடɼ‫ק‬ʂ‫ץ܄‬ভɿટɡԀɜʟɧɼɻՆҌֲ୞ʦਊɫ,20 [T] ʦෳವɿ 15 [T] ૝ʂຸߞя௾ɾߞॿʂ६‫ݩ‬ʦา଑ɫɺɘʟƆ֩इԶɼʂ৕ʓ‫܄‬ʣɯʖ෻੕ɾɘɧɼɠഇࠌߤɟɷɳʂɻ, ˘˲ˀߞॿ 4 ‫ڃ‬ʦ૥ໆɿഝʍ, ૠɩʦ 4 ఝඕ߹‫ٲ‬ʃ, ୱ੒তε٥֋߳, ୱ੒৔ຆޫഅ๲܎‫ݘ‬٥֋ɿɭʟา଑ɻɖʟƆʒɳ, ‫ױ‬ஓ୊‫ٺ‬ʂʺ˺ˎ˺ʼ˗˺ʶ˂˺ˆƟʦયअɿɫɳʷ˲Ɵ˞ɻ़۱ɫɺɘʒɭƆ˳Ɵʦֲшɭʟɧɼɻ, ˘˲ˀʂߖਞߗԝʖ 4 ఝɿɭʟƆʽƟʂҔ౎ɿɖɳɷɺʃ, ୱ੒ʂ‫ڝ‬ऑগ१ʂ٥֋߳, խλ൘, ˳ƟʽƟʃ, ˜ʪ˔ˀʃʏʐา଑૳ʞʂખɠࡥ

зগ१ʂ٥֋߳ɼ, ˘˲ˀߞॿʂҔ౎ɿɖɳɷɺʃ, ୱɺɘʟƆɳɴɫ, ‫ޫڶ‬ʂஂ‫ظ‬ɿʜɷɺӽ୞ɠक़‫ځ‬ɩʠɺ੒അड़٥ʂ‫ץ‬ஞগ१ʂ٥֋߳, ୱඅ੒‫ץ‬ਛ‫ݛ‬ດ٥֋ࡿʂ

614ฅࣽগ१ʂ٥֋߳ɼ֩ஔɻछʕɺɘʒɭƆ஦ɿߞॿʂҔ౎ɿɞɘɺʃ, ୱ੒৔ຆޫഅ๲܎‫ݘ‬٥֋˂˺ˆƟʂ‫ݥތ‬
٥֋φ, ο୉٥֋φɠયҴଯɾฉӍʦїɳɫɺɘʒɭƆඕ٥֋ʃ, Advanced Photon Science Aliance (APSA)ʂ޲ДʦࠬɥɺɘʒɭƆʒɳ, ඕ٥֋ʃୱඅ੒‫ץ‬ਛ‫ݛ‬ດ٥֋ࡿʂ֩ஔ๭ๆѨ੕ (15K0080, 16K0011, 17K0037) ɻɭƆඕ٥֋ʃ JSPS ѕ٥ಐ JP16H03970, JP17H05398
ʂࢊढ़ʦࠬɥɳʖʂɻɭƆ‫۪ދ‬ഓ٤
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[10] ‫ۉۿݥތ‬਩, ‫ۿ‬ʯ˔˲ʵƟ˒ˬƟˀ 34, 97 (2015).
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ɧʠʒɻɿʣʠ[13] OVAL ߹ ‫ ٲ‬ɿ ‫ ځ‬ʝ ɮ,ʣ ʠ ʂ ʷ ˲ Ɵ ˞ ɻ ౎ ಺ ɫ ɳ ໱ ഓ, ߊ ດ ʃ

http://tabletop.icepp.s.u-tokyo.ac.jp/ɿʒɼʕɺɖʟ.