Application of differential thermal contraction to obtain improved cryogenic interfacial contact

An apparatus comprising:

• a protrusion extending from a first component, wherein the protrusion of the first component is comprised of a first material, wherein the first material has a first thermal contraction property;
• and
• a recessed area located in second component to receive the protrusion of the first component, wherein the second component is comprised of a second material, wherein the second material has a second thermal contraction property, wherein the second component has an opening where a portion of the first component is inserted into at room temperature;
• wherein the second thermal contraction property is larger than the first thermal contraction property;
• when at cryogenic temperatures, the first component and second component constrict, wherein the second component constricts more than the first component causing the second component to exert a constricting force on the portion of the first component inserted into the opening of the second component.