Superconducting magnet device

1. A superconducting magnet device comprising:

a superconducting coil;

a radiation shield housing the superconducting coil;

a vacuum case housing the radiation shield;

an electrode member provided to the vacuum case; and

a conductive member connecting the electrode member to the superconducting coil,

wherein

the conductive member includes an oxidized lead disposed inside the radiation shield,

the vacuum case includes

a case body having an outer opening shaped to permit insertion of the oxidized lead, and

an outer lid shaped to close the outer opening and being detachably attachable to the case body,

the radiation shield includes

a shield body having an inner opening shaped to permit insertion of the oxidized lead, and

an inner lid shaped to close the inner opening and being detachably attachable to the shield body, and

the inner opening is formed in the region of the shield body that overlaps at least a portion of the outer opening when viewed in a direction from the outer opening to the oxidized lead.

2. The superconducting magnet device according to claim 1 , further comprising:

a fixed table that is provided in the radiation shield to fix the oxidized lead; and

a fastener that is detachably fastenable to the fixed table and configured to fasten the oxidized lead to the fixed table,

wherein

the fastener includes a manipulate-portion that is manipulated using a tool that is insertable through the outer opening and the inner opening, and

the fastener is fastenable to the fixed table with the manipulate-portion facing the outer opening and the inner opening.