Page 26 - Demo

Photon Neutralizer Proof of Principle Successful
H- beam/ 100 μs
Vacuum tank
Photon trap
6. Photon target test stand
The principle of photon trap for the negative ion beam neutralization operation is shown at
the schemes at Fig.6.1 and 6.2. In two-dimensional case it consists of bottom flat and top concave
mirrors. If we create a photon ray with a small angle with respect to vertical axes, it will get some
The principle of photon trap for the negative ion beam neutralization operation is shown at horizontal momentum difference in central axes of this system with each reflection from the upper
6. Photon target test stand
the schemes at Fig.6.1 and 6.2. In two-dimensional case it consists of bottom flat and top concave
mirror. Such a configuration looks like open plasma traps and photons motion is similar to mirrors. If we create a photon ray with a small angle with respect to vertical axes, it will get some
oscillations hoofripzloanstaml maopmaernttiucmledsifbfeeretwnceeincmentargalnaexteiscofmthiirsrsoyrsste.m with each reflection from the upper
mirror. Such a configuration looks like open plasma traps and photons motion is similar to
xn, F(xn)
y
oscillations of plasma particles between magneticMmirriorsr. ors y
xn, F(xn)
n
n
xx
80 cm
80 cm H-
H-
cylindrical mirror
200 cm 200 cm
Conical mirror Conical mirror
cylindrical mirror
§ H- neutralization via photodetachment has theoretical efficiency of 100% A reasonable three-dimensional geometry of the trap is a long arch assembly of four
§ Non-resonant, adiabatic photon trap
components, as shown at Fig.6.2: planar, cylindrical, and two conical mirrors. H - beam passes
along the photon trap.
photon trap. photon trap.
optical trap
components, as shown at Fig.6.2: planar, cylindrical, and two conical mirrors. H- - beam passes
A reasonable three-dimensional geometry of the trap is a long arch assembly of four
along the photon trap. -
§ Highly reflective mirrors provide up to 1000 bounces of laser beam § 95% neutralization efficiency experimentally demonstrated
Fig.6.3. The trace of a single ray in the photon trap with a random angle from 0 to 5 ° in the XY plane, and 0 to 10
PlanarPmlairnroar mirror
Fig.6.2. Scheme of a quasi-planar adiabatic
30 cm
30 cm
Fig.6.1. Two-dimensional scheme of the Fig.6.1. Two-dimensional scheme of the
Fig.6.2. Scheme of a quasi-planar adiabatic optical trap
degrees along the trap, the number of reflections is 4000.
random angle from 0 to 5 ° in the XY plane, and 0 to 10
We have carried out numerical simulations using Zemax code. Fig.6.3 shows one ray trace
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The cone angle of the end mirrors is about 3 degrees.
24th CAARI – Forth Worth, TX, November 2, 2016 Fig.6.3. The trace of a single ray in the photon trap with a
20 cm
20 cm