tuning the frequency of the rfq high energy end. what are the issues? both input & output ends...
TRANSCRIPT
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Tuning the Frequency ofthe RFQ High Energy End
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What are the issues?• Both input & output ends of RFQ must be
independently tuned for 324 MHz• Design of last few modulations undecided:
– Stop RFQ at last modulation cell?– Add 5 mm radius onto end of last cell?– Add Crandall cell (for quadrupole symmetry)?– Add Crandall cell and output matcher?
• Can any/all of these designs be tuned?• Matt Easton doing particle tracking for all• Note: copper already purchased!
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Last Few ModulationsEnd RFQ at last cell Add one βλ/4 (half-)Crandall cell
Note: Crandall cell should be βλ/2, but wanted to save space…Proper length cell would be similar frequency to those above.
310.5 MHz (can be easily tuned) 312.2 MHz (can be easily tuned)
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Tuning Frequency of Output End
Varying vane cut-back radius of curvature is an easy way to tune output end of RFQ, with or without a Crandall cell.
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Output Matcher
Assumes we use a Crandall cell to create quadrupole symmetry after the last modulation
409.9 MHz (not easily tuned!)
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2βλ Input Matcher (Final Design)
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1βλ Output Matcher (test)
Much lower capacitance of an output matcher increases local frequency to 410 MHz!
LC
1
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Try to Tune Output Matcher
No amount of tweaking to inductance and capacitance can bring frequency down to 324 MHz
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Summary
• Basic RFQ output end can be tuned
• Probably good to include a Crandall cell to remove jitter in beam final energy
• Output matcher not easy to tune…
• …and not enough copper for one anyway!