An overview over RERS1 is given. A detailed description, including many technical details such as required cable lengths, collimator sizes, area layout etc., can be found in the user's guide.
- 30 - 200 MeV proton beam (see RERS2 for lower energies with a narrow beam energy spread)
- 2 to 30 cm diameter beamspot
- fluxes 102 and 1011 p/s cm2
- tagging table
- uniformity: <30% variation over area
- exposure durations 5s - several hours
- absolute dosimetry better than 10%
The IUCF cyclotrons accelerate protons to 205 MeV. In RERS1, lower energies (as low as 30 MeV) are provided by placing Cu degraders immediately upstream of the DUT (device under test). Degraders are mounted on a remotely operated degrader positioner which has room for up to four degraders (see Fig. 1).
The device under test (DUT) is in air and mounted on a x,y,z adjustable table, which is remotely positionable in the two dimensions, x and y, perpendicular to the beam direction. Alignment of the DUT is conveniently accomplished with a laser which points in the beam direction.
The usual beam spot size is 7cm in diameter. The irradiated area may be restricted by use of collimators. Larger or smaller beam spot sizes (2 - 30 cm diameter) are also available.
For fluxes between 105 and 1011 p/s cm2 a calibrated secondary electron monitor (SEM) is used for dosimetry. For fluxes between 102 and 106 p/s cm2 a scintillator is used. The two devices are cross-calibrated between 105 and 106 p/s cm2.
A tagging table is available. Tagged protons are obtained by scattering the beam off hydrogen in a polyethylene (CH2) target.
Figure 2: View of the end of the beamline. The kapton exit window and one Cu degrader, mounted on the positioner, are visible. The DUT is supported by the device table.
Figure 3: View along the beamline. The entrance to the beamdump is visible in the background. In the foreground, one arm of the tagging table is shown.
For additional information on RERP or to schedule an experiment
please contact Barbara von Przewoski:
(812) 855-2913
(812) 855-6645
bvonprze(at)indiana.edu
RERP, Indiana University Cyclotron Facility
2401 N Milo B. Sampson Lane
Bloomington, IN 47408
