...
cd
sudo umount ~/slac_work_space
Additional notes:
- If required, it's possible to create an entry in /etc/fstab, and save credentials in a protected file. This would allow automatic mounts at reboot time, or else on-demand using the mount command and just the mount point (without needing to remember the long command line).
See also:
https://confluence.slac.stanford.edu/display/SCSPub/SSHFS+Unix+Storage+Access