LEIR Transverse Dampers Alfred Blas LIU-ION LEIR Internal Review 20.08.2014 1 Associated colleagues: Michel CHANEL Alan FINDLAY Wolfgang HOFLE Reinier LOUVERSE Increasing the beam intensity in LEIR Possible challenges for the transverse feedback Present situation : multi(70)-turn injection with 22μA-Pb54+ up to 7 times every 200 ms under electron cooling. 6E10 charges ejected on h2 with a 200 ns bunch length (4 sigma). Foreseen : multi(70)-turn injection with 22μA-Pb54+ up to 13 times every 100 ms under electron cooling. 8.6E10 charges ejected on h2 with a 200 ns bunch length (4 sigma).
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LEIR Transverse Dampers Alfred Blas LIU-ION LEIR Internal Review 20.08.2014 1 Associated colleagues: Michel CHANEL Alan FINDLAY Wolfgang HOFLE Reinier.
LEIR Transverse Dampers Alfred Blas LIU-ION LEIR Internal Review
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LEIR Transverse Dampers
Alfred Blas LIU-ION LEIR Internal Review 20.08.2014 1
Associated colleagues:
Michel CHANELAlan FINDLAYWolfgang HOFLEReinier LOUVERSE
Increasing the beam intensity in LEIR
Possible challenges for the transverse feedback
Present situation: multi(70)-turn injection with 22μA-Pb54+ up to 7 times every 200 ms under electron cooling. 6E10 charges ejected on h2 with a 200 ns bunch length (4 sigma).
Foreseen: multi(70)-turn injection with 22μA-Pb54+ up to 13 times every 100 ms under electron cooling. 8.6E10 charges ejected on h2 with a 200 ns bunch length (4 sigma).
Alfred Blas LIU-ION LEIR Internal Review 20.08.2014 4
2 stripline PUsUDHV 41 and 42almost 90 Betatron deg apart (whatever the tune)
Signal processing in 3 racks in the middle of the ring
1 stripline kicker KDHV21receives the processed Betatron transverse error, synchronous with the beam and with the apropriate 90 deg Betratron phase shift.
Table created by Michel Chanel for 4.8 E10 charges. The tune shifts, and thus the frequency limits, should scale linearly with the intensity. ( => multiply by 1.8 for 8.6E10 charges)
Alfred Blas LIU-ION LEIR Internal Review 20.08.2014 13
Conclusion:
With the increased intensity in LEIR, the transverse Landau damping is theoretically only obtained above 207 MHz in the worst case (value to be confirmed)
Below this limit an active damping is required.
Open questions:Do we need to need to “actively” cover this entire range to remain stable? Would the available 100 MHz be sufficient?… else can we relax some beam parameters? Δp/p?, transverse emittances?