Gradient coil unit with cooling duct

A gradient coil unit comprising:

• a gradient coil surrounding a cylinder axis and configured to generate a magnetic field gradient in a first spatial direction, the gradient coil including a hollow cylindrical primary layer including two primary conductor structural units and a cooling duct, wherein:
• each of the two primary conductor structural units includes a primary electrical conductor dividable into two mutually different sections electrically connected to one another in series, wherein a length of the two sections differs by less than 5%;
• and
• the two sections of each of the respective primary electrical conductors are spirally arranged in windings such that:
• two adjacent windings of the respective primary electrical conductor are associated with the two mutually different sections,
• the cooling duct is arranged at least partially between the respective two sections,
• the respective two sections and the cooling duct run at least partially parallel, and
• the respective two sections have a single respective contact surface with the cooling duct.