Linac 3 ABP and LIU G Bellodi for

Linac 3 – ABP and LIU G Bellodi for the Linac 3 team ABP and LIU meeting - 22 February 2017

LINAC 3 LIU challenges Alex Huschauer @ 2017 Chamonix workshop ABP and LIU meeting - 22 February 2017

Linac 3 source studies 2016 results: Studies Priority Timeline Who Einzel lens 2 2017 -2018 GB, DK Bipolar einzel lens installed at source extraction in order to add more focusing and matching flexibility Results not conclusive yet, to be further continued Understand focusing/emittance effects through measurements FC 2 transmission - u. A 300 250 200 150 HT=24. 8 k. V 100 11 -Jul 21 sept TWT on 14 -Jun -40 ABP and LIU meeting - 22 February 2017 -20 50 0 0 einzel voltage k. V 20 40

Linac 3 source studies Studies Priority Timeline Who Einzel lens 2 2017 -2018 GB, DK 2017 -2018 GB, FW, DK Understand focusing/emittance effects through measurements TWTA 1 Understand effect on beam emittance/transmission and stability issues effect on Pb charge state distribution 250 Pulse generator Oscillator Pulse pattern and ower level monitoring Beam current (u. A) TWTA From 2016 studies: 200 150 • 10% higher beam transmission achieved after RFQ and 5% after Linac after re-matching 100 50 0 27 28 29 30 31 32 33 34 35 36 37 38 Charge state TWTA off 12. 36 GHz 16. 71 GHz ABP and LIU meeting - 22 February 2017 • slightly less stable operation

Linac 3 source studies Studies Priority Timeline Who Einzel lens 2 2017 -2018 GB, DK 2017 -2018 GB, FW, DK Understand focusing/emittance effects through measurements TWTA 1 Understand effect on beam emittance/transmission and stability issues Automatic tuning 1 2017 -2018 DK + ? Start investigations/studies to develop a tuning control algorithm of the GTS source Missing manpower issue? ABP and LIU meeting - 22 February 2017

Linac 3 source studies Studies Priority Timeline Who Einzel lens 2 2017 -2018 GB, DK 2017 -2018 GB, FW, DK 2017 -2018 DK + ? missing Understand focusing/emittance effects through measurements TWTA 1 Understand effect on beam emittance/transmission and stability issues Automatic tuning 1 Start investigations/studies to develop a tuning control algorithm of the GTS source 150 ms tests with the source 2 2017 (~1 week, source only), 2018 Modify timing, ignition tests at 75 ms and 150 ms ABP and LIU meeting - 22 February 2017 DK, MON

Linac 3 oven test stand Studies Priority Timeline Who Oven test stand 2 2017, 2018 TKTK Characterise oven performance 2016 results: Measured data Axisymmetric model with ANSYS from EN/MME Temperature measurements successfully benchmarked against thermal numerical model in ANSYS. Next steps: Ø Measurement of Pb evaporation rate (study link to input power and temperature) Ø Study of oven performance with oxygen atmosphere Replicate the Linac 3 ion source operation conditions more closely Ø Study of oven performance with different Pb samples and crucibles (new vs recirculated samples and crucibles) Ø Thermal model Evolution of temperature distribution with Pb loading (cooler oven tip, etc. ) ABP and LIU meeting - 22 February 2017 Effect of varied oven structure to temperature distribution

Beam dynamics / low energy Studies Priority Timeline Who LEBT space charge compensation 2 2017 -2018 GB, SB 2 2017 -2018 AL, JBL 1 2017 GV 2 2017, 2018? GB, FR (BE-BI) Simulation studies New RFQ Simulation/design studies ERIS emittance application Extra features to be added Diagnostics studies Pepper pot, if re-installed ABP and LIU meeting - 22 February 2017

Beam dynamics / high energy Studies Priority Timeline Who Stripping foils 1 2017, 2018 GB, FW Systematic measurements to characterize foil deterioration and effect on beam injection/accumulated intensity in LEIR. Study energy distribution Used foils Op 17/06 -> 03/09 From 2015/6 studies: § Measurable signs of wearing observed after few weeks of usage (= energy spread broadening and mean energy shift). Better performance understanding. § DLC foils performance worse than for standard a. C foils ABP and LIU meeting - 22 February 2017

Thanks to all the Linac 3/ABP team: V Dimov*, T Kovener, D Kuchler, A Lombardi, M Maintrot*, R Scrivens, V Toivanen*, E Trachanas*, G Voulgarakis, F Wenander (* those who left already. . ) ABP and LIU meeting - 22 February 2017