rf kicker for head-on-collision
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
AccLab BmSci ICRKyotoUniversity
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]
http://wwwal.kuicr.kyoto-u.ac.jp
AccLab BmSci ICRKyotoUniversity
Time Structure of Beam
e+
e–t=0
IP300ns ~ 100m
LRF = 25m
t=τ0/4
- -Out bunch at the Center of In bunch
QuickTime˛ Ç∆Graphics êLí£ÉvÉçÉOÉâÉÄ
ǙDZÇÃÉsÉNÉ`ÉÉÇ å©ÇÈÇΩÇflÇ…ÇÕïKóvÇ≈Ç∑ÅB
AccLab BmSci ICRKyotoUniversity
Magnetic Field Strength
B = ~1 T.km @ 250GeV =L(4m)/(1mrad)=4kmB=0.25T
θ~1m rad
ρL=4m
AccLab BmSci ICRKyotoUniversity
Sketch of a Kicker
L=4m
Double C-typeBetter shieldingStep at center?
Variant
Stored Energy W ~ 125[J] @0.25T3cm x133 units
DC+3MHz (+9MHz)
AccLab BmSci ICRKyotoUniversity
Magnetic Alloy (Finemet)
Q <1 for non-cut coreQ~10 for cut core @a few mm gap
Large Test Core for JPARC
AccLab BmSci ICRKyotoUniversity
High B, low core loss
AccLab BmSci ICRKyotoUniversity
FT-3L
High B, low core loss, high Tc
AccLab BmSci ICRKyotoUniversity
Core Loss
FT-3L is the best option here.
AccLab BmSci ICRKyotoUniversity
Waveforms-1
1 2 3 4
-1
-0.5
0.5
1DC + 3MHz
25m
1 2 3 4
-1
-0.5
0.5
1 DC+3MHz+H1ê4L6MHz25m
1 2 3 4
-1
-0.5
0.5
13MHz + 6MHz
25m
Single RF needs DC
Wide Baseneeds DC
Two RF in One
No DCNarrow Base
Two RF in One
Two RF in One: Two cosine components superposition
AccLab BmSci ICRKyotoUniversity
Waveforms-2
1 2 3 4
-1
-0.5
0.5
13MHz+H1ê2L6MHz
25ê3m
1 2 3 4
-1
-0.5
0.5
13MHz+H1ê3L9MHz
12.5 m
No DCSeparate RF
Short LRF
Two RF
No DCSeparate RF
6MHz too(if 2 sides OK)
Short LRF
Two RF
Separate RF: Each component for each separate kicker
AccLab BmSci ICRKyotoUniversity
Combination
3MHz
9MHz
3MHz
•Separate two RF system for the latter two options.
•Phase slip for in-bunch can be compensated by phasing. ––> less perturbation
AccLab BmSci ICRKyotoUniversity
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