Transcript Injection and Extraction Optics

Beam Injection and Extraction Scheme
Vladimir Anferov
Injection-Extraction Overview
• Single Turn operation
 Two kickers create symmetric local orbit bump
 Lambertson in the middle of the bump
 to set the injected beam onto distorted closed orbit
 to extract the beam off the distorted closed orbit
• Multiple turn accumulation:
 Phase space painting accumulation scheme
 The kickers inject the beam off the closed orbit
 Kickers switch strength to fill the acceptance
Kickers & Lambertson Location
Kicker 1
Lambertson
Kicker 2
24mrad kick 
32 mm orbit bump
Phase advance between
kickers = p
Accumulation
 Upright phase space ellipse at the septum
 Horizontal betatron tune is Qx = 1.75
 Four turns can be injected off axis at one radius
Anticipated performance
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Maximum orbit bump amplitude is limited by
the 50mm aperture of the kicker.
Injection orbits are separated by 6mm,
which comes from 2mm septum + 2mm
space on each side
Septum Thickness = 2mm
Horiz. Aperture
= ±25mm
Total Turns
= 13
Phase radiuses
= 0, 6, 12, 18mm
Beam size
= 38mm
Kicker Design Specs
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Gap
Length
Rise time
Voltage
=
=
=
=
=
50 mm
40 cm (or longer)
10 nsec
75 kV at 25 MeV
150 kV at 50 MeV
CIS traveling wave kicker design
Kicker design issues

Feedthrough and vacuum can design for 10nsec
rise time
 Transition from 11cm wide elliptical chamber in
the dipole to 5cm gap in the kicker.
Lambertson magnet specs
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Bend angle
= 20 deg
Yoke length
= 10”
Field Gap
= 1” (2.54 cm)
Field (for 60MeV)= 2.47 kGauss
Septum width
= 2.0 mm
Leakage field
< 3.0 Gauss
for <1mrad bend at 25 MeV
Lambertson magnet design
• Assembly drawing
• Vacuum chamber
Field Calculations
End pack
Conclusion
• Injection scheme setup for either single
turn (in & out) operation or multiple turn
accumulation
• Lambertson design is out for fabrication
• Kicker design is not done yet