How to convert orbital momentum into spin momentum?

[kiwaho]

orbital movement occupy more space than spin movement.
If an object are running in both orbit and spin, how to stop orbit and transfer orbit energy to spin energy?
Of course the total angular momentum conserves.
I know new optical technology can convert spin energy into orbital energy, but it seems nobody study the reverse conversion.
If the object is a gyro, maybe I can push it to the central axial.
both welcome to discuss it in macroscope and microscope.

 

[kiwaho]

and how to convert linear momentum to angular momentum?
Particle accelerator can generate huge linear momentum, but dimension demand too greedy! Coulomb excitement can do the convert job, but too low efficient.
I like something looks standstill but full of huge energy!
Flywheel can store energy, so does high spin nucleus.