On the new possibility of pulse accumulation of UCN

TL;DR

This paper proposes a novel ultracold neutron source using a gradient spin flipper to decelerate very cold neutrons, creating pulsed UCN fluxes with high density, enabling efficient pulse filling of UCN traps.

Contribution

It introduces a new method for generating pulsed ultracold neutrons via deceleration of very cold neutrons with a gradient spin flipper, enhancing UCN source capabilities.

Findings

Pulse structure of VCN flux after deceleration.

Neutron bunches can be shorter than their repetition period.

High neutron flux density in the bunches.

Abstract

The paper considers the concept of an ultracold neutron source (UCN) based on the deceleration of very cold neutrons (VCN) by a local decelerating device. As the latter, it is proposed to use a gradient spin flipper. It is shown that in this case, the flux of VCNs, which after deceleration are converted into the UCN, has a pulse structure. In this case, the duration of neutron bunches can be significantly less than their repetition period. Accordingly, the density of the neutron flux in the bunch will significantly exceed the average value. This opens up the possibility of pulse filling of the UCN trap, without preliminary time focusing