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BTF diagnostics for measuring RFQ output beam Beam energy y’ [radian] Beam current Transverse emittance Movable phase detector (BPM) y [mm] Longitudinal emittance Energy spectrum 5 AAC / TAC Meeting, May 15 -17, 2018 High power beam dump

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Observed correlation in x’-w partial projection 1 1 2 3 Horizontal angle [rad] full projection (energy spectrum) looks ordinarily 11 AAC / TAC Meeting, May 15 -17, 2018

Similar patterns are observed in beam simulation with strong space charge x=x’=y’=0 y tia 1. 2 m l p ro jec tio ns 2. 5 Me. V 100 m. A Pa r 6 D Gaussian distribution Quadrupole magnets x’=y=y’=0 x energy 12 AAC / TAC Meeting, May 15 -17, 2018

Successful demonstration of 6 D phase space measurement technique and finding previously unknown correlations already opens new R&D possibilities for training young researchers and engaging small business • Improving speed and resolution of 6 D scan • Manipulation of massive 6 D data arrays • Methods of finding other correlations • Study of high order correlations in beam distribution function using particle tracking codes 13 AAC / TAC Meeting, May 15 -17, 2018

Focus-Drift-Defocus-Drift (FODO) line experiment Large Dynamic Range emittance scanner FODO line of 19 Permanent magnet quadrupoles Matching section • Beam dynamic simulation benchmark facility : – Measured 6 D distribution at input – FODO transport channel as simulation “benchmark case” – Large Dynamic Range emittance measurement at exit 14 AAC / TAC Meeting, May 15 -17, 2018 6 D phase space Achromatic measurements 180⁰ bend

FODO beam line design permanent magnet quad holding structure permanent magnet quad Magnetic measurements Assembled FODO line 15 AAC / TAC Meeting, May 15 -17, 2018

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High Dynamic Range measurements (halo) Slit-slit High Dynamic Range emittance scanner High Dynamic Range 1 D scan • Measure transverse profiles with ~ 107 dynamic range - Switched amplifier gain to overcome Analog to Digital Converter (ADC) Bit depth limit 17 AAC / TAC Meeting, May 15 -17, 2018

Long Term BTF development BTF area expansion would allow two experiments to co-exist and to add other capabilities PPS fence 18 AAC / TAC Meeting, May 15 -17, 2018 Building wall Beam dynamics beam line

Summary • BTF was used for new RFQ testing. New RFQ successfully integrated to SNS Front End. • BTF operation will be restored by incorporating old SNS RFQ. • BTF will continue to be a test bench for SNS accelerator systems improvement and testing. • BTF provides unique opportunities for general accelerator physics R&D. There is ongoing R&D program for high intensity beam dynamics study. • BTF beam can be used for non-accelerator related R&D as well, e. g. Moderator Demonstration Facility (MDF). This will require the BTF area expansion. 19 AAC / TAC Meeting, May 15 -17, 2018

Scan time reduction opportunities 1. Maximize sampling rate to 10 Hz: slit speed, data saving, ~x 4 2. Use smarter scanning algorithm, ~x 2 80% of measured points are zero! 3. Redesign Beam Shape Monitor (BSM) for simultaneous W-ϕ measurement, ~x 10 magnet camera φ RF deflector 20 AAC / TAC Meeting, May 15 -17, 2018 view screen W

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