@ESS Christine Klauser1,2 1Institut Laue-Langevin, Grenoble, France

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Presentation transcript:

@ESS Christine Klauser1,2 1Institut Laue-Langevin, Grenoble, France 2Atominstitut, Technische Universität Wien, Austria

The Set-up Goal: maximal statistics (well-defined flux) Condition: chopper Condition: Final pulse length 2 m

The Sources Peakflux ratio: 30 4.5 - 5.5 Å 75 Hz 14 Hz 2.86 ms pulse length

space time

spectrum space Chopper opening time time

Comparison

spectrum space Chopper opening time time

Initial Pulse Length

Optimised Frecquency

Ratio Decay Volume/Final Pulse Length Gain PERC “normal” Gain PERKEO Gain PERC long pulse

Conclusion ESS has a gain factor up to 5 for PERC compared to ILL Gain varies considerably with distance Ideal placement close to source

Pulse Growth In Decay Volume