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在神光Ⅱ激光装置上进行了辐射驱动不同掺杂样品的单模Rayleigh-Taylor (RT)不稳定性实验. 结果显示: 与纯碳氢(CH)样品相比, 掺Br的CH样品的扰动更早、更快地进入非线性区, 产生二次谐波, 并且掺Br比例越高, CH样品扰动进入非线性区的时间越早, 相同时刻扰动的二次谐波的幅度越高. 这是因为密度梯度效应抑制了二次谐波的产生, 掺Br比例越高, 密度梯度标长越小; 同时密度梯度效应还抑制三次谐波对基模增长的负反馈, 造成基模具有更大的线性增长, 导致线性饱和幅值大于经典值0.1λ.
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关键词:
- 掺杂 /
- Rayleigh-Taylor不稳定性 /
- 密度梯度效应 /
- 弱非线性阶段
Ablative Rayleigh-Taylor growth was measured with single-mode modulated planar CH foil with different ratio of Br dopant at Shenguang Ⅱ laser facility. Results show that CH (6% Br) sample first enters the nonlinear regime and has the largest perturbation amplitude of second harmonic. The reason is that the density gradient effects can suppress the generation of the second harmonic, the more the Br is doped, the smaller the density gradient scale length can be achieved. The density gradient effects also suppress the feedback of third-order harmonic to the fundamental mode, which induces the nonlinear saturation amplitude to exceed 0.1λ, as the classical prediction shows.[1] Remington B A, Weber S V, Marinak M M, Haan S W, Kilkenny J D, Wallace R J, Dimonte G 1995 Phys. Plasmas 2 241
[2] Park H S, Remington B A, Becker R C, Bernier J V, Cacallo R M, Lorenz K T, Pollaine S M, Prisbrey S T, Rudd R E, Barton N R 2010 Phys. Plasmas 17 056314
[3] Casner A, Galmiche D, Huser G, Jadaud J P, Liberatore S, Vandenboomgaerde M 2009 Phys. Plasmas 16 092701
[4] Budil K S, Lasinski B, Edwards M J, Wan A S, Remington B A, Weber S V, Glendinning S G, Suter L, Stry P E 2001 Phys. Plasmas 8 2344
[5] Sakaiya T, Azechi H, Matsuoka M, Izumi N, Nakia M, Shigemori K, Shriaga H, Sunahara A, Takabe H, Yamanaka T 2002 Phys. Rev. Lett. 88 145003
[6] Budil K S, Remington B A, Peyser T A, Mikaelian K O, Miller P L, Woolsey N C, Wood-Vasey W M, Rubenchik A M 1996 Phys. Rev. Lett. 76 4536
[7] Casner A, Smalyuk V A, Masse L, Igumenshchev I, Liberatore S, Jacquet L, Chicanne C, Loiseau P, Poujade O, Bradley D K, Park H S, Remington B A 2012 Phys. Plasmas 19 082708
[8] Marinak M M, Glendinning S G, Wallace R J, Remington B A, Weber S V, Hann S W, Collins G W 2002 Phys. Plasmas 9 3567
[9] Shigemori K, Azechi H, Nakai M, Honda M, Meguro K, Miyanaga N, Takabe H, Mima K 1997 Phys. Rev. Lett. 78 250
[10] Watari T, Nakai M, Azechi H, Sakaiya T, Shiraga H, Shigemori K, Fujioka S, Otani K, Nagai K, Sunahara A, Nagatomo H, Mita K 2008 Phys. Plasmas 15 092109
[11] Wang R R, Chen W M, Wang W, Dong J Q, Xiao S L 2010 Chin. Phys. B 19 075202
[12] Fang Z H, Wang W, Jia G, Dong J Q, Xiong J, Zheng W D, Li Y S, Luo Q P, Fu S Z, Gu Y, Wang S J 2009 Acta Phys. Sin. 58 7057 (in Chinese) [方志恒, 王伟, 贾果, 董佳钦, 熊俊, 郑无敌, 李永生, 罗庆平, 傅思祖, 顾援, 王世绩 2009 58 7057]
[13] Cao Z R, Miao W Y, Dong J J, Yuan Y T, Yang Z H, Yuan Z, Zhang H Y, Liu S Y, Jiang S E, Ding Y K 2012 Acta Phys. Sin. 61 075213 (in Chinese) [曹柱荣, 缪文勇, 董建军, 袁永腾, 杨振华, 袁铮, 张海鹰, 刘慎业, 江少恩, 丁永坤 2012 61 075213]
[14] Yuan Y T, Hao Y D, Hou L F, Tu S Y, Deng B, Hu X, Yi R Q, Cao Z R, Jiang S E, Liu S Y, Ding Y K, Miao W Y 2012 Acta Phys. Sin. 61 115203 (in Chinese) [袁永腾, 郝轶聃, 侯立飞, 涂绍勇, 邓博, 胡昕, 易荣清, 曹柱荣, 江少恩, 刘慎业, 丁永坤, 缪文勇 2012 61 115203]
[15] Wang L F, Ye W H, Li Y J 2010 Phys. Plasmas 17 052305
[16] Wang L F, Ye W H, He X T 2012 Phys. Plasmas 19 012706
[17] Fan Z F, Luo J S, Ye W H 2009 Phys. Plasmas 16 102104
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[1] Remington B A, Weber S V, Marinak M M, Haan S W, Kilkenny J D, Wallace R J, Dimonte G 1995 Phys. Plasmas 2 241
[2] Park H S, Remington B A, Becker R C, Bernier J V, Cacallo R M, Lorenz K T, Pollaine S M, Prisbrey S T, Rudd R E, Barton N R 2010 Phys. Plasmas 17 056314
[3] Casner A, Galmiche D, Huser G, Jadaud J P, Liberatore S, Vandenboomgaerde M 2009 Phys. Plasmas 16 092701
[4] Budil K S, Lasinski B, Edwards M J, Wan A S, Remington B A, Weber S V, Glendinning S G, Suter L, Stry P E 2001 Phys. Plasmas 8 2344
[5] Sakaiya T, Azechi H, Matsuoka M, Izumi N, Nakia M, Shigemori K, Shriaga H, Sunahara A, Takabe H, Yamanaka T 2002 Phys. Rev. Lett. 88 145003
[6] Budil K S, Remington B A, Peyser T A, Mikaelian K O, Miller P L, Woolsey N C, Wood-Vasey W M, Rubenchik A M 1996 Phys. Rev. Lett. 76 4536
[7] Casner A, Smalyuk V A, Masse L, Igumenshchev I, Liberatore S, Jacquet L, Chicanne C, Loiseau P, Poujade O, Bradley D K, Park H S, Remington B A 2012 Phys. Plasmas 19 082708
[8] Marinak M M, Glendinning S G, Wallace R J, Remington B A, Weber S V, Hann S W, Collins G W 2002 Phys. Plasmas 9 3567
[9] Shigemori K, Azechi H, Nakai M, Honda M, Meguro K, Miyanaga N, Takabe H, Mima K 1997 Phys. Rev. Lett. 78 250
[10] Watari T, Nakai M, Azechi H, Sakaiya T, Shiraga H, Shigemori K, Fujioka S, Otani K, Nagai K, Sunahara A, Nagatomo H, Mita K 2008 Phys. Plasmas 15 092109
[11] Wang R R, Chen W M, Wang W, Dong J Q, Xiao S L 2010 Chin. Phys. B 19 075202
[12] Fang Z H, Wang W, Jia G, Dong J Q, Xiong J, Zheng W D, Li Y S, Luo Q P, Fu S Z, Gu Y, Wang S J 2009 Acta Phys. Sin. 58 7057 (in Chinese) [方志恒, 王伟, 贾果, 董佳钦, 熊俊, 郑无敌, 李永生, 罗庆平, 傅思祖, 顾援, 王世绩 2009 58 7057]
[13] Cao Z R, Miao W Y, Dong J J, Yuan Y T, Yang Z H, Yuan Z, Zhang H Y, Liu S Y, Jiang S E, Ding Y K 2012 Acta Phys. Sin. 61 075213 (in Chinese) [曹柱荣, 缪文勇, 董建军, 袁永腾, 杨振华, 袁铮, 张海鹰, 刘慎业, 江少恩, 丁永坤 2012 61 075213]
[14] Yuan Y T, Hao Y D, Hou L F, Tu S Y, Deng B, Hu X, Yi R Q, Cao Z R, Jiang S E, Liu S Y, Ding Y K, Miao W Y 2012 Acta Phys. Sin. 61 115203 (in Chinese) [袁永腾, 郝轶聃, 侯立飞, 涂绍勇, 邓博, 胡昕, 易荣清, 曹柱荣, 江少恩, 刘慎业, 丁永坤, 缪文勇 2012 61 115203]
[15] Wang L F, Ye W H, Li Y J 2010 Phys. Plasmas 17 052305
[16] Wang L F, Ye W H, He X T 2012 Phys. Plasmas 19 012706
[17] Fan Z F, Luo J S, Ye W H 2009 Phys. Plasmas 16 102104
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