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Jan van der Laan MIT-Bates Linear Accelerator Center Middleton, MA 01949

Switchyard / Switches / Optics. Jan van der Laan MIT-Bates Linear Accelerator Center Middleton, MA 01949 ASAC Review , September 18-19, 2003. Layout. Beam pulse structure Switchyard layout Ferrite kickers Beam line optics HGHG, RF switches Conclusions. Beam Pulse Structure Options.

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Jan van der Laan MIT-Bates Linear Accelerator Center Middleton, MA 01949

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  1. Switchyard / Switches / Optics • Jan van der Laan • MIT-Bates Linear Accelerator Center • Middleton, MA 01949 • ASAC Review , September 18-19, 2003

  2. Layout • Beam pulse structure • Switchyard layout • Ferrite kickers • Beam line optics • HGHG, RF switches • Conclusions

  3. Beam Pulse Structure Options • Gun RF pulses, 10 kHz, 5 ms • 1 beam pulse / gun RF pulse • 10 beamlines 1 kHz each • CW SC linac • Gun RF pulses, 1 kHz, 10 ms • 10 beam pulses / gun RF pulse • 10 beamlines 1 kHz each • CW SC linac

  4. 10 kHz gun rate, single beam pulses

  5. 1 kHz gun rate, 10 pulses per burst

  6. Beam Switch Yard layout

  7. Aerial view

  8. Ferrite kicker • Length 1.0 m • Gap: (w) 20 mm * (h) 12 mm • Good field (5e-4) width, 12 mm • 250 Amp -> 0.5 kG • Deflection angle @ 1 GeV 5 mrad

  9. Bates Transmission Line Kicker 1.3 ms 20 ns • Fast kicker, Bates • L = 1 m, > 1 mrad @ 1 GeV • Rise/fall time 20 ns, full scale • Rep. rate 1 kHz

  10. Switches • Specifications for the switches are relatively relaxed • Frequency 1 kHz • Deflecting angle 2 – 5 mrad • Energy 1 – 4 GeV • Switching into a BSY, not a ring, so devices can have • small apertures. • (no impedance issues, single / multiple bunch instabilities) • Usage of both magnetic or electrostatic kickers is possible.

  11. Emittance growth in switch yard Emittance growth in switchyard dipoles: 5.5 % • Keep b functions small • Achromatic and isochronous for multiple lines • Tracking studies to be done

  12. Achromatic, isochronous optics Horizontal Vertical [mm] 4 2 0 2 4 0 25 50 [m]

  13. Achromatic, isochronous optics, con’t Dispersion [mm/%] -75 0 75 0.98999 14.10167 0.00000 0.00000 0.00000 0.00000 -0.00749 0.90342 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 -0.95197 -30.61844 0.00000 0.00000 0.00000 0.00000 -0.53252 -18.17813 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 1.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 1.00000 ( 65) *FIT* ACHR R16 0.0 /0.00010 ( -0.232E-05 ) ( 66) *FIT* ACHR R26 0.0 /0.00010 ( 0.255E-05 ) ( 67) *FIT* ISOC R51 0.0 /0.00010 ( -0.134E-07 ) ( 68) *FIT* ISOC R52 0.0 /0.00010 ( 0.429E-06 ) ( 69) *FIT* ISOC R56 0.0 /.10E-04 ( -0.144E-06 ) *LENGTH* 54.36845 M

  14. Combined beamlines Horizontal Vertical [mm] 4 2 0 2 4 0 25 50 [m]

  15. Combined beamlines con’t Dispersion [mm/%] -75 0 75 *TRANSFORM 1* -0.99908 -4.29254 0.00000 0.00000 0.00000 0.00001 -0.24675 -2.06108 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 -0.87487 -48.43427 0.00000 0.00000 0.00000 0.00000 -0.01868 -2.17721 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 1.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 1.00000 ( 71) *FIT* ACHR R16 0.0 /0.00010 ( 0.132E-04 ) ( 72) *FIT* ACHR R26 0.0 /0.00010 ( 0.217E-05 ) ( 73) *FIT* ISOC R51 0.0 /0.00010 ( -0.611E-07 ) ( 74) *FIT* ISOC R52 0.0 /0.00010 ( -0.405E-06 ) ( 75) *FIT* ISOC R56 0.0 /.10E-04 ( -0.270E-06 ) *LENGTH* 63.46844 M

  16. switch yard optics • Longitudinal phase space • isochronous beam: R5x = 0 • Transverse phase space • achromatic beam: Rx6 = 0 • Constraints fulfilled for two beamlines • Emittance dilution in dipoles is 6% per dipole. • Extend to more beamlines • ELEGANT simulations including CSR to be performed

  17. 2-stage HGHG cascade with multiple e-bunches Delay line, combining two subsequent electron bunches in the HGHG process Mod B Disp B Rad B Mod A Disp A Rad A Monochromator Presentation: Seeding for Fully Coherent beams William S. Graves

  18. RF Switch @ 1 GeV 1 GeV, to delay line Accelerate to 4 GeV • Frequency 650 MHz • Active cavity length 1.0 m • Transverse gradient 3.0 MV/m • Deflection angle 2.5/2.5 mrad

  19. Delay line • Dt 0.77 ns = 0.23 m • Bending angle 100 / 200 mrad • Total length 50 m • Transverse displacement 1 m • Isochronous, achromatic

  20. Conclusions • Beam pulse structure can be very flexible • Switch yard and beam lines fit on site • Ferrite kickers are appropriate switches • Beam line optics in progress, more work to do • RF switches for HGHG and delay lines

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