the fragment beam (or fragment cocktail beam) from the A1900
Target (TA) Position:
the object point of the A1900; the location where fragments are
generated when the beam strikes a target inserted into the beam (see
schematic)
Image 1 (I1), Image 2 (I2), and Image 3 (I3):
focal points within the A1900 – see
schematic; detectors, slits, wedges, and viewers are typically
placed at these locations
Focal Plane (FP):
the final image position within the A1900 – see
schematic; detectors located here are used to identify and measure
rates of fragments transmitted by the A1900
Extended Focal Plane (XF):
the region just beyond the switching magnet at the end of the A1900
and just in front of the entrances to the beamlines serving the
experimental vaults (see
schematic)
Segment 0:
the beamline magnets between the K1200 cyclotron and the A1900 target
position
Segment 1:
the section of the A1900 between the target position and I1
Segment 2:
the section of the A1900 between I1 and I2
Segment 3:
the section of the A1900 between I2 and I3
Segment 4:
the section of the A1900 between I3 and the focal plane
Bρ1, Bρ2, Bρ3, and Bρ4:
the rigidities corresponding to segments 1–4, respectively
Wedge Degrader:
a wedge-shaped sheet of material placed in the path of the fragments
to enhance the purity of the isotopes transported by the A1900; a list
of commonly used wedges is availible here
Barney:
the graphical user interface application used for high-level control
of the cyclotrons, the A1900, and the beamlines
Moe:
the program running “behind the scenes” that sets magnet
currents according to user input into Barney
Barney Saveset:
a text file that Barney generates (at the request of the user) which
documents the settings of the A1900 and beamline hardware; Barney
savesets are posted on the
A1900 web;
a paper printout is also generated whenever a saveset is made
Focus Mode Optics:
an optical mode for running the A1900 in which fragments are focused
at the focal plane and viewed using focal plane detectors; fragments
are not transported well to the experimental vaults in this mode
Transmission Mode Optics:
an optical mode for running the A1900 in which fragments are focused
in the extended focal plane so that they can be transported through
the transfer hall beamlines to an experimental vault; focal plane
detectors are not very useful in this mode
