Research on the secondary electron yield of tizrv-pd thin film coatings

TL;DR

This study measures and analyzes the secondary electron yield of Pd, TiZrV, and TiZrV-Pd thin film coatings under ultrahigh vacuum, revealing low SEY in TiZrV-Pd films beneficial for particle accelerator beam screens.

Contribution

It provides new measurements of secondary electron yield for TiZrV-Pd films, highlighting their low SEY and potential advantages in accelerator applications.

Findings

TiZrV-Pd films exhibit low secondary electron yield.

Maximum SEY varies with primary electron dose.

TiZrV-Pd films have high H2 absorption and long lifetime.

Abstract

In particle accelerators, the build-up of electron cloud may have important influence on beam quality. Especially for the positron and proton accelerators, massive electrons lead to electron cloud, which affects the stability, energy, emittance and beam life adversely. A secondary electron emission (SEE) measurement system has been designed and used to study the SEE of palladium (Pd), TiZrV and TiZrV-Pd with an independently adjustable energy from 50 eV to 5 keV. Here, we obtained the characteristics of the SEE from Pd, TiZrV and TiZrV-Pd film coatings with different thickness under ultrahigh-vacuum (UHV) conditions. Moreover, the maximum secondary electron yield (SEY), {\delta}max, of the Pd, TiZrV and TiZrV-Pd film coatings under different primary electron doses were obtained, respectively. Finally, the variation of the secondary electron yield with the incident electron energy will be discussed for Pd, TiZrV and TiZrV-Pd thin film coatings. Low SEY is a new advantage of TiZrV-Pd films, besides high H2 absorption ability and prolonging the lifetime of TiZrV film, which will be of great value in the design of beam screen for Super Proton-Proton Collider (SPPC).