Speaker: Yoshihiro Ishi
Abstract: The recent status of the FFA accelerator complex at KURNS will be reported. Experimental plans using proton beams from the main ring will be also presented.
Categories
FFA'20
International Workshop on Fixed Field alternating gradient Accelerators
8 replies on “Status and Plans for the FFA Complex at KURNS”
Firstly what is the source of tune variation in PiPER ring. I assume that the momentum spread is not large, a few percent? Is it difficult to make zero chromaticity design? Secondly is the cod of 1 mm in PiPER ring from misalignment of magnets?
Is it still a FINEMET style cavity, used in the ring?
What is the peak gap voltage?
ERIT had an energy recovery cavity. Will that be the case for PiPER?
What considerations led you to have such a low current and pion production rate for PiPER?
We set the gap voltage to 135 kV, the frequency 7.94 MHz and the harmonic number 1. Since the frequency is fixed, we plan to use air-core cavity like KURNS ERIT.
Since PiPER doesn’t accelerate i.e. it is full energy injection ring, we need only an energy recovery cavity.
The beam current is limited by the radiation safety of the facility in which we assume to install.
The momentum spread is +/- 1.7%. The optimization procedure of the pole and the field clamp shape was stopped when the tune spread was suppressed so that the resonance crossing doesn’t occur. Although we haven’t confirmed properly, the tune spread suppression can be made for larger momentum spread like in the case of KURNS BOOSTER with the same design concept which uses the return yokes and field clamps.
In this design work, the source of COD is the rf cavity because we put no misalignment of magnets, which we should check.