A beamtime REQUEST is usually made by a NIST staff member, or a collaborator, or a PRT* member, to ask for days from the allocation of instrument time reserved for in-house and PRT programmatic research.
Normally, a user should submit a PROPOSAL rather than a REQUEST.
Some instruments are available only through REQUESTS. These include the BT4 filter-analyzer spectrometer, the BT4 triple-axis spectrometer, the SPINS triple-axis spectrometer, the NG7 horizontal-sample reflectometer, and the BT8 residual-stress diffractometer. Non-NIST and non-PRT scientists interested in using these instruments should contact a NIST staff member to see if collaborative research can be arranged.