Hadron Orbit in IP2 April 6, 2018
Work performed • RHIC at store, 12 bunches (rebucketed) in yellow ring B r = 727.7 T m • Quadrupoles in the common section were excited with maximal swing (+/- 6.4 A) D GL = 1.0731 T, D K = 0.0015 m -1 • Tunes were monitored using BBQ • Orbit in common section was monitored with CeC BPMs (9 MHz and 500 MHz)
b -functions 𝛾 = ±4𝜌 Δ𝜉 Δ𝐿 ∆𝐿𝛾 ∆𝑦, 𝑧 = 2tan(𝜌𝜉 𝑦,𝑧 ) 𝑦, 𝑧 2𝜌∆𝜉 𝑦,𝑧 ∆𝑦, 𝑧 = tan(𝜌𝜉 𝑦,𝑧 ) 𝑦, 𝑧
BPM signals
Orbit in Common Section From the linear fit actual position in the BPMs was calculated and offsets were programmed.
Conclusions • We have data but signal to noise ratio is low. We need to repeat measurements at lower energy and 111 bunches fill. • The procedure can work for measuring position of both beam inside interaction region with quadrupoles placed on either side and monitoring beams displacement after separation.
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