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LINAC4 transfer line – optics. L4. L2. PSB. Optics Layout Tunability Safety margins. ↕ 2.5m. LINAC4 transfer lines : 177.31 m (from PIMS out to foil); 69.83 m new line,then join at BHZ20 the present Linac2 line (107.48 meters from BHZ20 to foil).

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Linac4 transfer line optics
LINAC4 transfer line – optics

L4

L2

PSB

  • Optics

  • Layout

  • Tunability

  • Safety margins

↕ 2.5m

LINAC4 transfer lines : 177.31 m (from PIMS out to foil); 69.83 m new line,then join at BHZ20 the present Linac2 line (107.48 meters from BHZ20 to foil).

Active elements : 4+2bendings;16+18 quads,11+11 steerers and 1 RF cavity.

M. Eshraqi, L. Hein, A. Lombardi (BE-ABP)


Optics layout
Optics-layout.

  • Uncompensated longitudinal space charge forces,

  • Dispersion and space charge

  • X-Y coupling

  • Bottlenecks : RF cavity; septum , distributor

  • Match the six conditions at the PB (disp=0;dis-1.4;various beta)

  • Contain the emittance increase (30% at max, can be reduced)

  • Accept energy swing of 1.2 MeV

  • At foil: 65mA in 0.3-0.4 pi(rms mm mrad norm) ΔE= 100-150 keV rms

W

A

L

L


Optics and tunability
Optics and tunability

X,y rms

Ratio aperture/rms above 6 everywhere


Errors and correctors
Errors and Correctors

  • Static alignment errors can be corrected with steerers

  • Jitter in the bending power supplies should be kept below 10-4

  • Jitter in linac energy is important for DIS and SEP acceptance


At dis beam size all cases
AT DIS, beam size-all cases.

  • In 4 rms there is more than 90% of the beam

  • Effect of energy painting is of the order of 5-10 mm (not included in the plot).

D=1.4

D=0

vertical aperture might be the limit for tunability in the case D=0 , unless we change yc=5.19 mm



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