FIG. 15.
![Entropy increase from diffusive mixing of hohlraum wall material (gold) and helium gas fill TΔS vs ratio of “bubble” amplitude to acceleration scale length on the gold side of hohlraum/gas interface Δb/Δg,2 for two values of interface Atwood number [0.80 (green), 0.90 (black)]. Solid lines denote ionization state of Au equal to 50; dashed line for Z2 = ZAu = 20, 30, 40. Assumed hohlraum conditions are initial helium gas-fill density of 1 mg/cc, Z1 = ZHe = 2, hohlraum diameter (length) of 5.75 mm (10 mm), temperature of 2 keV and total mix width of 500 μm. Open red circle on Z2 = 20 curve denotes expected conditions near end of laser power trough (g > 0); upper circle at Z2 = 50 during subsequent peak power rise (g < 0).](https://aipp.silverchair-cdn.com/aipp/content_public/journal/pop/28/7/10.1063_5.0049114/1/072701_1_f15.jpeg?Expires=1717056128&Signature=wMWp-i6WnGmacd7b4vG7hut~xHvU~QaODZWUFOqJTwK2raKHHBa4vsSivqpRiR~ATVCs1-Aqxkahq2lNcD1tV-vjn~mAFRjhWm7OzuK-pxee9t~IYtU2zL2zEF~5a5exLRxHlHgyIDtag0ZiuepIP-2pd0svDoAAoEvPx9Wc9lt16100JhXRVBE6TGHjbjPCTiNTuCbQAuE5G8R-4QrMz3-xsEKz53uDWh6HECCIbrcJ5XAReshMlulVI0Ud0PbWjZHifd2VTtEQ12aOrnYD~YzMr6U~EGQGYW~PEabgXsJ50Cv~93zLuesJ75HHpddjlRg-i~sOfCOo1Sa0D6ENgA__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Entropy increase from diffusive mixing of hohlraum wall material (gold) and helium gas fill TΔS vs ratio of “bubble” amplitude to acceleration scale length on the gold side of hohlraum/gas interface Δb/Δg,2 for two values of interface Atwood number [0.80 (green), 0.90 (black)]. Solid lines denote ionization state of Au equal to 50; dashed line for Z2 = ZAu = 20, 30, 40. Assumed hohlraum conditions are initial helium gas-fill density of 1 mg/cc, Z1 = ZHe = 2, hohlraum diameter (length) of 5.75 mm (10 mm), temperature of 2 keV and total mix width of 500 μm. Open red circle on Z2 = 20 curve denotes expected conditions near end of laser power trough (g > 0); upper circle at Z2 = 50 during subsequent peak power rise (g < 0).
