Summary of RHIC BBLR Discussion on 07.12.2006

Participating: UD, WF, JPK, GS, FZ

RHIC run plan depends on US budget development;
at the moment continuing resolution;
in the best case cool down in January, but delay until March possible

Interest by GS and JPK to verify the dependence of LR effects
on the #LR collisions; could be tested in RHIC with BBLR at various strengths

WF welcomes suggestions concerning the RHIC experimental programme;
one goal would be to make the experiments more robust

GS presented slides on simulations of D0 scheme with different types of
early separation; he uses local emittance variance criterion of UYP and FZ;
at 0 and 90 degree in x-y space D0 improves the situation, 
at 45 degrees the chaotic boundary is reduced; 
different partition of total dipole strength over two dipole locations 
yield about the same result;
tune dependence is likely; nominal tunes were used in simulations

FNAL experience: 1 LR at 5 sigma has a strong effect;
calibration of diffusion coeeficient is needed;
this is a strong incentive for machine experiments

UD showed simulations results for 2005 and 2006 RHIC experiments
at injection and at top energy; simulations use Q'=2, include
sextupoles, and consider off-momentum particles launched 
at 1 sigma_delta

BNL optics modeling and tracking is done by Yun Luo and
Christoph Montag; in 2006 only one clear experiment, at a different tune;
a corresponding updated RHIC optics model is being developed;
it will be shipped to Ulrich when ready so that he can repeat his
simulations for this experiment;
UD's conclusion: influence of LR interaction seen in simulations,
but sextupoles + off-momentum particles required to be observed

FZ proposal: blow up transverse emittance in RHIC and see effect of BBLR 
on profile monitor (e.g., measure unstable boundary vs. separation); 
RHIC is movable transversely;
JPK proposal: use Schottky monitor to detect dips at resonance locations
and amplitude-dependent detuning (as in the ISR);
WF: BTF measurements also give some information on tune distribution - 
they could be simulated

FZ: orbits and tunes must be corrected for each BBLR current and
each distance (as done in the SPS) to get meaningful results; 

goals: scaling with current, distance, and energy; 

end of store studies at RHIC are possibility at least for testing the tools; 

priority given to LR assessment with BBLR as LR simulator;
compensation secondary goal, especially for gold ions where
beam-beam effect will be weaker than for protons;
1st demonstrate that there is a problem for LHC and/or RHIC upgrade;
2nd implement compensation;
understand power low (lifetime vs. distance) and differences between machines;
BBLR could be alternative to phase-2 collimation,
but probably yields only ~0.5 sigma gain in triplet aperture;
check merits with Ralph?!
we pray for the RHIC budget;

plan: make synthesis of SPS experiments; presentation to UD & GS & JW 
after Xmas; draft RHIC experimental programme based on SPS experience;
methods and proposals

JPK: For octupole compensation, look for papers by J. Gareyte.