The machine is an rf linear accelerator operating at the
L-band frequency of 1300 MHz. Three experimental ports are available:
the 90° port offers a beam energy-analyzed to ±1-10%,
depending on the slit position. The 30° port
gives analyzed beams as well; the 0° port produces
slightly higher beam currents, but is not well defined in energy.
A trigger synchronous with the electron beam (<10 ps jitter)
is available for timing and repetitive sampling experiments.
Also available is a non-synchronous pre- or post-trigger, which
can be adjusted to ± 10 µs with respect to the sync trigger;
this trigger is useful for gating electronics before, or initiating
a readout cycle after, the linac pulse.
Applications: Among others,
- Transient Radiation Effects in Electronics (TREE) testing
- Semiconductor device characterization via the 50 ps short-pulse
capability
- TREE code validation experiments, and
- Various university research projects.
Cost: $500/hr
Contact: Dr.
Doug Wells
|
 |
An overhead view of the 44 MeV LINAC |
Note that, because of the 1300 MHz
rf structure, all pulse widths longer than the 50
ps short pulse are composed of a string of 50 ps-wide
pulses, each separated by 770 ps.
ELECTRON ENERGY: 2-44 MeV
|
PULSE WIDTH: 50 ps to 2 µs
Pulse width gradiations: 2, 5,10,20,30,and
50ns,
500 ns to 2 µs |
 |
REPETITION RATE: single pulse to 120Hz
LINAC BEAM PARAMETERS
(Typical for 6-25 MeV; somewhat lower for
higher energies)
Pulse
Width |
Maximum
Current |
Charge/
Pulse |
Peak
e-Dose |
Peak
Gamma Dose** |
|
| 50ps |
100A |
5nC |
2 x 1013 rads/s |
2.5 x 108 rads/s |
| 2ns |
10A |
20nC |
1 x 1012 |
1.2 x 107 |
| 20ns |
3A |
60nC |
6 x 1011 |
7.5 x 106 |
| 100ns |
1A |
100nC |
2 x 1011 |
2.5 x 106 |
| 4us |
0.5 A |
2000nC |
1 x 1011 |
1.25 x 106 |
|
** On axis at 1 meter from standard water-cooled
gamma target.
| 1. Bunched e-beam Mode: |
| Energy Ranges |
0.5 to 28 MeV |
| Pulse Width |
50 ps |
| Rise Time |
5 ps |
| 2. Short Pulse Non-bunched Mode: |
| Dose Rate |
~ 1.0 E12 Rad(Si)/s over » 1cm² |
| Pulse Width Range |
2 – 50 ns |
| Rise Time |
0.2 ns |
| 3. Long Pulse Non-bunched Mode: |
| Dose Rate |
~ 2.0 E11 Rad (Si)/s over ~1cm ² |
| Pulse Width Range |
100 ns –2 ms |
| Rise Time |
function of pulse width |
| Rep. Rate |
1 shot, 5, 15, 30, 60, 120 Hz |
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