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Tuning the Frequency of the RFQ High Energy End. What are the issues? Both input & output ends of RFQ must be independently tuned for 324 MHz Design of.

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Presentation on theme: "Tuning the Frequency of the RFQ High Energy End. What are the issues? Both input & output ends of RFQ must be independently tuned for 324 MHz Design of."— Presentation transcript:

1 Tuning the Frequency of the RFQ High Energy End

2 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!

3 Last Few Modulations End 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 MHz (can be easily tuned) MHz (can be easily tuned)

4 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.

5 Output Matcher Assumes we use a Crandall cell to create quadrupole symmetry after the last modulation MHz (not easily tuned!)

6 2βλ Input Matcher (Final Design)

7 1βλ Output Matcher (test) Much lower capacitance of an output matcher increases local frequency to 410 MHz!

8 Try to Tune Output Matcher No amount of tweaking to inductance and capacitance can bring frequency down to 324 MHz

9 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!


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