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Tan, Cheng-Yang

Publications and source records attributed to Tan, Cheng-Yang.

2 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Fermilab Booster Beam Emittances from Quadrupole Modes Measured BPMs

The measurement of beam emittances by extracting the quadrupole mode signal from a 4 plate beam position monitor (BPM) was published at least 40 years ago. Unfortunately, in practice, this method suffers from poor signal to noise ratio and requires a lot of tuning to extract out the emittances. In this paper, an improved method where multiple BPMs are used together with better mathematical analysis is described. The BPM derived emittances are then compared with those measured by the Ion Profile Monitor (IPM). Surprisingly, the BPM measured emittances behave very well and are more realistic than those measured by the IPM.

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DOE OSTI2024

The Tevatron Transverse Dampers

We describe in this paper the theory and construction of the Tevatron transverse dampers. The goal of these dampers is to keep the beam stable when we operate at lower chromaticities. The reason for operating at lower chromaticities is to improve the beam lifetime. However, the beam becomes unstable at low chromaticities and thus dampers are required. Also included in this paper are the damper commissioning notes and their real-life performance.

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