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

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Presentation transcript:

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

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

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 ]

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

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

HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET 6

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

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

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

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

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

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

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

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

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

HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET Monte Carlo Simulation: 5:4 pattern Mparticles - time-lapse:

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

HEINE DØLRATH THOMSEN January 25, 2013 AARHUS UNIVERSITET High Frequencies? Existing Systems ›J-LAB: ›B = 40 G, L =15 cm ›f = 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 = kHz ›Ferrite-based magnets ›H-bridge of IGBTs ›LANL MTS: ›f = ( ) kHz (sinus.) ESS? ›B = 250 G, L = 4 x 30 cm? ›f = 5-20 kHz? (TD + Science) ›Air-coils? 18

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

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