Abstract
The Integrable Optics Test Accelerator (IOTA) is a storage ring for advanced beam physics research currently being built and commissioned at Fermilab. It will operate with protons and electrons using injectors with momenta of 70 and 150 MeV/c, respectively. The research program includes the study of nonlinear focusing integrable optical beam lattices based on special magnets and electron lenses, beam dynamics of space-charge effects and their compensation, optical stochastic cooling, and several other experiments. In this article, we present the design and main parameters of the facility, outline progress to date and provide the timeline of the construction, commissioning and research. The physical principles, design, and hardware implementation plans for the major IOTA experiments are also discussed.
Highlights
Integrable Optics Test Accelerator (IOTA) ring designThe IOTA ring design is determined by the demands of the experimental program, limitations of the available space and cost optimization
The P5 physics goals require about 900 kt·MW·years of total exposure
The Integrable Optics Test Accelerator (IOTA) research program includes the study of nonlinear focusing integrable optical beam lattices based on special magnets and electron lenses, beam dynamics of ultimate spacecharge effects and their compensation, optical stochastic cooling, and several other experiments – see Section 3 below
Summary
The IOTA ring design is determined by the demands of the experimental program, limitations of the available space and cost optimization. The IO experiments require a high precision of the linear optics tuning: the betatron phase advance in the ring must be controlled at the level of 10-3 (in units of 2 ), and the beta-function in the nonlinear insert must be controlled at the level of 1%. Following acceleration of up to 50 MeV, the electron beam passes through the low-energy beam transport section, which includes steering and focusing elements, and an optional chicane (R56 = -0.18 m) for bunch compression and beam transforms. The high energy section begins with a TESLA Type IV ILC-style cryomodule, which has been conditioned previously to 31.5 MeV/cavity at 2 K [12] to yield a total acceleration of 250 MeV and, provide up to 300 MeV electron beam. Value 20 MeV – 300 MeV < 10 fC – 3.2 nC per pulse 0.5 – 9 MHz for up to 1 ms (3000 bunches, 3 MHz nominal) 1 – 5 Hz Range: 0.9 – 70 ps (Nominal: 5 ps) Horz: 1.6 ± 0.2 μm Vert: 3.4 ± 0.1 μm
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