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A system, in certain embodiments, includes an accumulator. The accumulator includes a first cylinder configured to receive a fluid within an internal volume of the first cylinder. The accumulator also includes a piston configured to move axially within the first cylinder. Axial movement of the pisto

A system, in certain embodiments, includes an accumulator. The accumulator includes a first cylinder configured to receive a fluid within an internal volume of the first cylinder. The accumulator also includes a piston configured to move axially within the first cylinder. Axial movement of the piston within the first cylinder adjusts the internal volume of the first cylinder. The accumulator further includes a plurality of shape memory alloy wires configured to cause the axial movement of the piston within the first cylinder.

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1. A system, comprising: an accumulator configured to store fluid to operate mineral extraction equipment, wherein the accumulator comprises: a first cylinder configured to receive a fluid within an internal volume of the first cylinder;a piston configured to move axially within the first cylinder,

1. A system, comprising: an accumulator configured to store fluid to operate mineral extraction equipment, wherein the accumulator comprises: a first cylinder configured to receive a fluid within an internal volume of the first cylinder;a piston configured to move axially within the first cylinder, wherein axial movement of the piston within the first cylinder adjusts the internal volume of the first cylinder;a rod extending axially from the piston;a first end cap disposed at a first axial end of the accumulator, wherein the first end cap is connected to the rod;a second end cap disposed at a second axial end of the accumulator, wherein the second end cap is connected to the first cylinder;a shape memory alloy extending from the first end cap to the second end cap, wherein the shape memory alloy is configured to cause the axial movement of the piston within the first cylinder; anda controller configured to adjust an amount of electrical current through the shape memory alloy. 2. The system of claim 1, wherein the accumulator comprises a frame between the first cylinder and the first end cap. 3. The system of claim 1, wherein the second end cap comprises an opening through which the fluid enters and exits the internal volume of the first cylinder. 4. The system of claim 1, comprising a power supply configured to supply an electrical current through the shape memory alloy. 5. The system of claim 1, wherein the accumulator comprises a second cylinder which radially surrounds the first cylinder. 6. The system of claim 1, comprising a blowout preventer fluidly coupled to the accumulator. 7. The system of claim 1, wherein the shape memory alloy is made of a material comprising Nitinol. 8. The system of claim 1, wherein the shape memory alloy is disposed external to the first cylinder. 9. The system of claim 1, comprising a sensor coupled to the controller, wherein the controller is configured to adjust the amount of electrical current through the shape memory alloy based at least in part on a measurement sensed by the sensor. 10. A system, comprising: an accumulator configured to store fluid to operate mineral extraction equipment, wherein the accumulator comprises a piston disposed within a cylinder, a rod extending from the piston, a first end cap connected to the rod and disposed at a first axial end of the accumulator, and a second end cap connected to the cylinder and disposed at a second axial end of the accumulator; wherein the piston is configured to axially move within the cylinder by a shape memory alloy extending from the first end cap to the second end cap. 11. The system of claim 10, wherein the shape memory alloy is disposed external to the cylinder. 12. The system of claim 10, wherein the cylinder couples to an end of a frame. 13. The system of claim 12, wherein the frame comprises at least one linear bearing. 14. The system of claim 10, wherein the shape memory alloy comprises at least one shape memory alloy wire configured to cause axial movement of the piston within the cylinder. 15. The system of claim 10, wherein the shape memory alloy comprises a film of shape memory alloy configured to axially move the piston within the cylinder. 16. The system of claim 10, wherein the shape memory alloy is made of a material comprising Nitinol. 17. The system of claim 10, comprising a power supply configured to supply an electrical current through the shape memory alloy. 18. The system of claim 17, comprising a controller configured to adjust the supply of electrical current through the shape memory alloy. 19. The system of claim 17, comprising a sensor coupled to a controller, wherein the controller is configured to use a measurement from the sensor to adjust the supply of electrical current through the shape memory alloy. 20. A method for actuating an accumulator configured to store fluid to operate mineral extraction equipment, comprising: supplying an electrical current through a shape memory alloy extending from a first end cap disposed at a first axial end of the accumulator to a second end cap disposed at a second axial end of the accumulator to axially move an accumulator piston within an accumulator cylinder; andadjusting an amount of the electrical current with a controller based at least in part on a measurement sensed by a sensor. 21. The method of claim 20, wherein supplying the electrical current through the shape memory alloy comprises increasing the temperature of the shape memory alloy above a transition temperature of the shape memory alloy, wherein the transition temperature of the shape memory alloy is the temperature at which the shape memory alloy transitions from a Martensite phase to an Austenite phase. 22. The method of claim 20, wherein the shape memory alloy is disposed external to the accumulator cylinder. 23. The system of claim 20, wherein the sensor comprises a pressure sensor, a temperature sensor, a flow rate sensor, or a displacement sensor.