Abstract
Due to its effective pumping ability, nonevaporable getter (NEG) coating is considered for the vacuum chambers of the Compact Linear Collider (CLIC) electron damping rings (EDR). The aim is to suppress fast beam ion instabilities. The electromagnetic (EM) characterization of the NEG properties up to ultra-high frequencies is required for the correct impedance modeling of the damping ring (DR) components. The properties are determined using rectangular waveguides which are coated with NEG. The method is based on a combination of complex transmission coefficient ${S}_{21}$ measurements with a vector network analyzer (VNA) and 3D simulations using CST Microwave Studio\textregistered{} (CST MWS). The frequency ranges discussed in this paper are 220--330 and 500--750 GHz.
Highlights
Getters are solid materials capable of chemically pumping gases such as H2, CO2, CO, and N2 after activation
Due to its effective pumping ability, nonevaporable getter (NEG) coating is considered for the vacuum chambers of the Compact Linear Collider (CLIC) electron damping rings (EDR)
This paper describes the method used to infer the NEG coating properties at frequencies of hundreds of GHz for the first time and discusses the obtained results
Summary
Getters are solid materials capable of chemically pumping gases such as H2, CO2, CO, and N2 after activation. The titanium (Ti), zirconium (Zr), and vanadium (V) alloy has the lowest activation temperature at 180 °C [1,2] Use of such a coating can help ultrahigh vacuum to be achieved inside an accelerator and can be applied even to very narrow chambers which are hard to pump out with other methods. NEG is widely employed in accelerators and various machines such as ESRF, ELETTRA, and SOLEIL have acquired extensive experience on NEG pumps and coatings. Other synchrotrons such as MAX IV and Sirius are basing the storage ring vacuum pumping mainly on NEG films with more than 95% of the chambers being coated. This paper describes the method used to infer the NEG coating properties at frequencies of hundreds of GHz for the first time and discusses the obtained results
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