EBIS Review

EBIS Review, January 27-28, 2005

EBIS Review


General impression• Very convincing concept of replacing the Tandems by a modern

injector, based on EBIS• The EBIS has seen outstanding development at BNL with respect to

high current performance, stable operation and possibility of fast switching between different ion species

• We have been convinced that no ECR ion source can serve the same purpose, due to the high charge state, intensities, memory effects; nor the laser ion source due to fast pulsing requirements

• Upgrade is really needed because the Tandems are seen to be at the end of their lives. Due to the considerable saving on operation cost, fast realization will be most rewarding for fast return of investments

• The solution proposed allows extension of ion species in RHIC up to Uranium to those elements which are not available as negative ions


EBIS

• Analyze and improve ion energy spread and possible transverse-longitudinal coupling

• Measure beam parameters including emittance at highest possible peak currents


LEBT• More studies including 3-D simulations are

needed in the presently proposed layout• Look for alternatives (separation of charge

states in front of the RFQ)• Avoid long distances between focusing elements• A fast switched 100 kV HV platform looks

challenging• Define optimum injection energy into the RFQ

with respect to space charge limitation of the LEBT


RFQ

• A PMQ at the end of the RFQ looks inappropriate with respect to fast switching of ions with different q/m. We recommend a modification of the RFQ electrodes to optimize matching with MEBT.


IH-structure

• Compare magnetic focusing with integrated electric focusing. BNL can make a later decision depending on the progress in this field


Conclusions

• We have seen impressive and comprehensive presentations of the project

• All items including safety aspect have been well covered

• We envisage very high probability of success of this project with little risk


Thank you

Documents

EBIS Review