Rick Baartman

ISAC-2 switchyard beams' characteristics

ISAC-2 switchyard beams' characteristics

February 22, 2006

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Figure 1: SEBT3A: 2 mm spot diameter for e=4 mm.
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Figure 2: SEBT3B: 2 mm spot diameter for e=4 mm. Low resolution tune.
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Figure 3: SEBT3B: 2 mm spot diameter for e=4 mm. High resolution tune. Resolution = 800 for e=4 mm.
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Figure 4: SEBT3B: 1 mm spot diameter for e=4 mm. Low resolution tune.
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Figure 5: SEBT3A: 1 mm spot diameter for e=4 mm.
Smallest possible spot sizes on target versus emittance and drift length:
emittance (mm)drift (m)div. (mrad)spot dia. (mm)
6 (Low E, pessimistic) 1.0201.2
2.0141.7
3 (Typical) 1.0170.7
2.0121.0
1.5 (High E, optimistic)1.0130.45
2.0100.62
SEBT3A and SEBT3B will run with doubly achromatic tunes. They can be made identical, to have identical beam characteristics. The only difference between the two legs is that only SEBT3B can have a dispersed focus (at the midpoint between the bends) of momentum resolution 800 (meaning a dp/p of 1:800 will shift the beam over by one beam diameter) while supplying beam on target. This means on-line energy analysis/control with a slit.










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Figure 6: For completeness, here is SEBT2 for MAYA with e=6 mm.

File translated from TEX by TTH, version 3.67.
On 23 Feb 2006, 13:29.