激光離子加速機制綜述簡介講解

1、主要內(nèi)容離子加速機制綜述簡介TNSA(target normal sheath acceleration)BOA(brcak out afterburner) DCE(directed-coulomb-explosion) BubbleCES(collisionless electrostatic shock)RPAfradiation pressure acceleration)近期模擬工作離子加速機制簡介-TNSA激光(線偏振)預脈沖等離于體層主脈沖(io20 W/cm2)-超熱電子云超熱電了穿越靶區(qū)(幾個I 兒個um)的輔層電場，短時間內(nèi)(Ps)便 被電離的質(zhì)子加速所得的高能離/能量分傷

2、范I羽較廣(5MeV50MeV)自和似解法: 連續(xù)性方程:初； 玄巾) Ap dnt莎+=C,= ZTjMj能量定標率：弘=“九2心+第S eV 9.33 X 10" a7 W/cm2 X2 nrE oc|%機制的局限性：熱電子溫度降低，等離子體標長增長離子追上電子，鞘層電場強度減小或消失，能散100%S. C. Wilks, Phys. Plasmas, Vol. 8, No. 2, February( 2001) P Mora er "PhysRevLett.90.185002 (2003)nun.um red wiih pnMorvrch dotncKWoarclec

3、tnc|MmOsuxs>2這種微結構靶(mass I i mi ted target) 同一能呈從而獲得單能性較好的質(zhì)子束的質(zhì)子經(jīng)過相同的靜電場被加速到1.2MeV,能散度20%激光:3#1019W/cm2鈦靶(5um) 含質(zhì)子PMMA (0.5um) 橫向(20 *20) um2)遠小于鞘層加速場的尺寸，質(zhì)子處于加速場 的中心區(qū)域H. Schwoerer, et al., Nature.439,445 (2006)離子加速機制簡介BOA (break-out afterburner)激光：10A21 W/cm2C靶：10-500nm三個階段：I Initial TNSA在靶前形成熱電子

4、，穿越靶，形成鞘場 form two-temperature electron plasma 冷電子可防止激光穿透II .Enhanced TNSA冷電子變熱，進入慚場 電荷分離場+冇質(zhì)動力III .Laser Break-Out Afterburner熱電子擴散，激光穿透靶離子與場一起移動，被加速30nm 2Gev!/!ie 202224x (micron) 4920.16202884k (mScron)ptn&1616 20x (micron)L.YIN, Laser and Particle Beams(2006) 24,291-298liw*> hat離子加速機制簡介-D

5、CE(directed-coulomb-explosion)庫倫爆破：激光作用于靶上，電子百接被打出，后形成離 了層,得到分離場(非均勻電場)的加速explosion:響加速場的結構，逐漸影響離子的 密度分布和場的分布：分離場受時間尺度的限 制，離子層也會擴散開用雙層靶：巫離子層和電子層之間形成的電場 能便中間的質(zhì)子得到仃效的加速，捉高質(zhì)子的 單能性10A21 W/cm250MevS.V.Bulanov Physics Letters A 299,240-247 (2002) E.Fourkal Physics Letters E 71,036412 (2005)離子加速機制簡介-Bubble

6、空泡：100 etecvons procor#x/k激光向前傳輸?shù)倪^程中，電子被短脈沖激光推出, 周圍電子回流，形成空泡結構空泡包含背景離子和空間電場純空泡結構，加速的離了單能性差Mass limited target:背景低密度等離子體中放H靶， 質(zhì)子在空泡電荷分離場中得到令效加速(RPA+bubble)10A23 W/cm2 38GevBaifei Shen Physics Review Special Topics 12,121301(2009)離子加速機制簡介CES(collisionless electrostatic shock)Hole boring and collisi on

7、 less electrostatic shock激光推動電子形成電子層(electron spike), 離子層(electron-free spike; unperturbed plasma ions)滯后的離子與電子戻形成山.荷分離場，加速離子， the second ion spikeThe unperturbed plasma ions between these moving spikes are reflected by the electric field, acceleratedThus z an electrostatic shock propagating into a

8、plasma is formed被反射過程中，亟離了和輕離子得到的速度是樣的，那么亟 決了的能塑臥 所以shock機制能右效地加速亟離子Min Chen, Physics of Plasma 14,053012 (2007)LiangliangJi, PRL 101,164802(2008)M.S.Wei, PRL 93,155003(2004)離子加速機制簡介- RPA(radiation pressure acceleration)激光活塞（laser-piston）模空：線偏振T Esirkcpov. PRL VOLUME 92, NUMBER 17 April 2004B. Qiao,

9、 PRL 102, 145002 April 2009圓偏振激光，有質(zhì)動力無慝蕩項，減小 熱電子的產(chǎn)生hole-boring:圓値振激光作用于靶的表面.有質(zhì)動力將電子 壓縮，形成靜電分離場，離子被加速light-sail:靶足夠薄，便這壓縮作用持續(xù)到接近靶背 激光將被壓縮的電了和離了起從靶中推出兩個階段激光壓有突變（減?。x子獲得能屋（1 - 1/4于）&對離子能暈的限制：橫向不穩(wěn)怎性，電子層變形等, 加速長度受到限制No. Reference12 34S67N9H1 1l2rE!51617uK2(2l2225歩25”2:<，(> Qulntum eiiects j 02

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15、nFlui-l wnc Cu 1X5Hiroyuki Daido Rep.Prog.75(2012) 056401l>rcton/u)n Incidence energy angle (e> <McV/nuclcon)04S30450 and 40Ml454S4545 04S4545 00045 0對離子的需求： 高密度低能散B. Qiao, PRL 102, 145002 April 2009X,Q,Yan PRL 103,135001 (2009)控制橫向不穩(wěn)定性，增加加速K度PRL 109 245008 (2012)PHYSICAL REVIEW LETTERSGene

16、rating High-Enerjo Highly Charged Ion Beams from Pctawatt-Class Laser Interactionswith Compound THrgrtsA. V. KmziunuuHJv? ' E.3. Etiinciiko.1 S. V. Ovlutw.* and A. V. Kiiii*1 Jncjirurz尸Ayckt.臭用 Acadenty StNtthnyHuxcmJ" PkviOct. tgQ Unhrtitr.X7 l/nwJ.(Rttxiwd 20 khnuiy 2012; pubUOicd 14 Dece

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