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An impingement plate is cooperable with a shroud assembly. The shroud assembly includes an outer shroud and plural inner shrouds with seals between the plural inner shrouds, respectively. The impingement plate includes a trailing edge portion, a leading edge portion and a mid portion between the tra

An impingement plate is cooperable with a shroud assembly. The shroud assembly includes an outer shroud and plural inner shrouds with seals between the plural inner shrouds, respectively. The impingement plate includes a trailing edge portion, a leading edge portion and a mid portion between the trailing edge portion and the leading edge portion. A plurality of impingement holes are formed across an area of the impingement plate, and a cooling and damping section includes at least one channel that is shaped to accelerate cooling flow through the impingement plate.

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1. An impingement plate cooperable with a shroud assembly, the shroud assembly including an outer shroud and plural inner shrouds with seals between the plural inner shrouds, respectively, the impingement plate comprising: a trailing edge portion, a leading edge portion and a mid portion between the

1. An impingement plate cooperable with a shroud assembly, the shroud assembly including an outer shroud and plural inner shrouds with seals between the plural inner shrouds, respectively, the impingement plate comprising: a trailing edge portion, a leading edge portion and a mid portion between the trailing edge portion and the leading edge portion;a plurality of impingement holes formed across an area of the impingement plate; anda cooling and damping section including at least one channel that is shaped to accelerate cooling flow through the impingement plate, wherein the cooling and damping section is positioned to direct cooling air to the seals between the plural inner shrouds. 2. An impingement plate according to claim 1, wherein the cooling and damping section is shaped to dampen bucket pulsation from a cooling side of the seals. 3. An impingement plate according to claim 1, wherein the cooling and damping section extends from the leading edge portion to the mid portion. 4. An impingement plate cooperable with a shroud assembly, the shroud assembly including an outer shroud and plural inner shrouds with seals between the plural inner shrouds, respectively, the impingement plate comprising: a trailing edge portion, a leading edge portion and a mid portion between the trailing edge portion and the leading edge portion;a plurality of impingement holes formed across an area of the impingement plate; anda cooling and damping section including at least one channel that is shaped to accelerate cooling flow through the impingement plate, wherein the at least one channel comprises a converging diameter in a flow direction. 5. An impingement plate according to claim 4, wherein the cooling and damping section comprises a series of conical channels. 6. An impingement plate according to claim 5, wherein the series of conical channels extends from the leading edge portion to the mid portion. 7. An impingement plate according to claim 6, wherein the conical channels in the series of conical channels are sized according to an amount of damping desired at the plural inner shrouds adjacent the impingement plate. 8. An impingement plate according to claim 7, wherein at least one of the conical channels in the series of conical channels is sized differently than others of the conical channels. 9. An impingement plate according to claim 4, wherein the cooling and damping section comprises a trapezoidal shaped channel. 10. An impingement plate according to claim 9, wherein the trapezoidal shaped channel extends from the leading edge portion to the mid portion. 11. A shroud assembly comprising: an outer shroud including outer shroud hooks at an inner end thereof;plural inner shrouds including connecting structure securable to the outer shroud hooks;a seal connected between adjacent ones of the plural inner shrouds; andan impingement plate disposed between the outer shroud and the plural inner shrouds, wherein the impingement plate comprises: a trailing edge portion, a leading edge portion and a mid portion between the trailing edge portion and the leading edge portion,a plurality of impingement holes formed across an area of the impingement plate, anda cooling and damping section including at least one channel that is shaped to accelerate cooling flow through the impingement plate, wherein the cooling and damping section is positioned to direct cooling air to the seal between the plural inner shrouds. 12. A shroud assembly according to claim 11, wherein the cooling and damping section is shaped to dampen bucket pulsation from a cooling side of the seal. 13. A shroud assembly according to claim 11, wherein the cooling and damping section extends from the leading edge portion to the mid portion. 14. A shroud assembly according to claim 11, wherein the at least one channel comprises a converging diameter in a flow direction. 15. A method of cooling and dampening seals between inner shrouds in a shroud assembly, the method comprising: (a) interposing an impingement plate between an outer shroud and the inner shrouds;(b) directing cooling air through the impingement plate; and(c) accelerating the cooling air through the impingement plate adjacent the seals, wherein step (c) is practiced by providing a cooling and damping section in the impingement plate and by forming at least one channel through the impingement plate, the channel having a converging diameter in a flow direction.