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RF Kicker for Head-on-Collision. Y. Iwashita Accelerator Laboratory, Advanced Research Center of Beam Science, Institute for Chemical Research, Kyoto University, Gokanosho, Uji, Kyoto 611-0011, JAPAN [email protected] http://wwwal.kuicr.kyoto-u.ac.jp.

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rf kicker for head on collision
RF Kicker for Head-on-Collision
  • Y. IwashitaAccelerator Laboratory,
  • Advanced Research Center of Beam Science, Institute for Chemical Research, Kyoto University, Gokanosho, Uji, Kyoto 611-0011, [email protected]://wwwal.kuicr.kyoto-u.ac.jp
magnetic field strength
Magnetic Field Strength

B = ~1 T.km @ 250GeV

 =L(4m)/(1mrad)=4km

B=0.25T

sketch of a kicker

Variant

Better shielding

Step at center?

Sketch of a Kicker

DC+3MHz (+9MHz)

L=4m

Stored Energy W ~ 125[J] @0.25T

3cm x133 units

magnetic alloy finemet
Magnetic Alloy (Finemet)

Large Test Core for JPARC

Q <1 for non-cut core

Q~10 for cut core @a few mm gap

slide7

FT-3L

High B, low core loss, high Tc

core loss
Core Loss

FT-3L is the best option here.

waveforms 1

Single RF

needs DC

Wide Base

needs DC

Two RF in One

No DC

Narrow Base

Two RF in One

Waveforms-1

Two RF in One: Two cosine components superposition

slide10

No DC

Separate RF

Short LRF

Two RF

No DC

Separate RF

6MHz too

(if 2 sides OK)

Short LRF

Two RF

Waveforms-2

Separate RF: Each component for each separate kicker

combination
Separate two RF system for the latter two options.

Phase slip for in-bunch can be compensated by phasing. ––> less perturbation

Combination
comments
MA has been used for RF accelerating cavity to generate high voltage(V==BS). –> Not for generation of B. ( R&D! )

The number units 133 reduces a serious hazard. (133 cores, 133 Amp’s)

Upgradable to 1TeV(6MHz) –– Two sets?

Easier than Crab-cavity

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