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TATIONpRÆSEN January 25, 2013 AARHUS UNIVERSITET Raster Scanning of the ESS Beam Heine Dølrath Thomsen 1.

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Presentation on theme: "TATIONpRÆSEN January 25, 2013 AARHUS UNIVERSITET Raster Scanning of the ESS Beam Heine Dølrath Thomsen 1."— Presentation transcript:

1 TATIONpRÆSEN January 25, 2013 AARHUS UNIVERSITET Raster Scanning of the ESS Beam Heine Dølrath Thomsen 1

2 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET The HEBT (28.05 2012) 2 Dipoles, Quadrupoles Octupoles ›UHB: Energy upgrade + movable collimators. ›ACH: Achromatic elevation. Tune-up lines below. ›A2T: Beam expander system (non-linear) + fixed collimator.

3 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Exploiting the target footprint area! 3 Lowering the max. current density J => increasing target life! J [µA/cm 2 ]

4 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems I: DC Magnets 4 ESS2003-LP ESS2003-SP, CSNS, IFMIF

5 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET The HEBT (28.05 2012) 5 Dipoles, Quadrupoles Octupoles

6 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET 6

7 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems II: 1D Rastering 7

8 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems II: 1D Rastering 8

9 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems II: 1D Rastering 9

10 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems II: 1D Rastering 10

11 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems II: 2D Rastering 11 Traditionally:Hor. MPS: Slow Ver. MPS: Fast

12 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems II: 2D Rastering 12

13 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Beam Expander Systems II: LANL APT 13 x,y [arb. units] One ESS pulse fy/fx = 5:4

14 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Linear optics: 10 RMS beam size 14 ACH A2T triplet 4+4 r.m. doublet

15 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Multiparticle: 1 Mparticles of SCL output 15

16 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Monte Carlo Simulation: 5:4 pattern 16 10 Mparticles - time-lapse: http://users-phys.au.dk/heinetho/raster_anim_MC.gif

17 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Choice of frequencies? ›f0 = 1 / Δt = 350 Hz ›fx = nx × f0 ›fy = ny × f0 Conditions: 1)nx, ny are integers 2)nx/ny as irrational as possible? 3)Intensity modulations at instruments? ›Frequency stability ›Modest phase stability 17

18 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET High Frequencies? Existing Systems ›J-LAB: ›B = 40 G, L =15 cm ›f = 10-45 kHz ›Air-coils of Litz-wire ›H-bridge of MOSFETs ›LANL APT ( 1.7 GeV, 100 mA ): ›B = 500 G, L = 4 x 30 cm ›f = 0.5-0.6 kHz ›Ferrite-based magnets ›H-bridge of IGBTs ›LANL MTS: ›f = (20 + 60) kHz (sinus.) ESS? ›B = 250 G, L = 4 x 30 cm? ›f = 5-20 kHz? (TD + Science) ›Air-coils? 18

19 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET ESS Lissajous System ›Linear optics! ›All feasible magnetic elements ›Losses: 0 / 10 6 particles! Choice of frequency set? ›Neutron yield modulation at instruments? ›Target stress & fatigue? ›… 19

20 HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Development of the Lissajous System 20 AC MagnetsModulator Beam Optics HDT, ISA 2013.06: CDR for Lissajous system 2013.10: Comparison of beam expanders 2014:TDR + prototype Design partner

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