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The test of gravitational force on antimatter in the field of the mattergravitational field, produced by earth, can be done by a free fall experimentwhich involves only General Relativity, and with a Mach-Zehnder interferometerwhich involves Quantum Mechanics. This article presents a new method to producea tunable low energy (Ps ) beam suitable for trapping the (Hbar + ) ion in afree fall experiment, and suitable for a gravity Mach-Zehnder interferometerwith (Ps). The low energy (Ps) beam is tunable in the [10 eV, 100 eV] range.

Tunable low energy Ps beam for the anti-hydrogen free fall and for testing gravity with a Mach-Zehnder interferometer