Transcript BNL LARP Accelerator Physics Program Resources BNL role in national program

BNL LARP Accelerator Physics Program
Resources
BNL role in national program
BNL Accelerator Physics Program
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LARP FY06 Program Resources
36% ($4.0M) of funding goes to Accelerator Systems:
- Beam diagnostics instrumentation
- Accelerator Physics theory, simulations & expts
- Commissioning
- Collimation
52% ($5.7M) goes to Superconducting Magnet R&D
- Goal oriented: first LHC Interaction Region upgrade
- Limited funding allows only a narrow scope
Nb3Sn quadrupoles (necessary in all scenarios)
First IR upgrade only
No IR dipoles, fast cycling magnets, magnetic TAN, ...
Minimal synergy other programs (ITER, ...)
- No construction!
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BNL role in the LARP Accelerator Physics Program
BNL names in
blue, task leaders
UPPER CASE
Electron cloud
Drees, He, ..
IR Comm.
Wanderer, ..
Tune feedback
CAMERON, ..
Cleaning Eff. Studies
DREES, ..
Beam-Beam wires
Fischer,
post-doc, ..
Beam Comm.
Calaga,
Drees, ..
Lumimonitor
Drees
Irradiation studies
SIMOS, ..
Schottky
Cameron
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BNL LARP Accelerator Physics Program - strong role of RHIC
The RHIC complex is a major accelerator facility. In a few years it will be the
only US high energy hadron collider and, together with the LHC, one of two
in the world. This produces a significant degree of synergy with the LHC.
Numerous beam dynamics issues are under study both within LARP and external
to LARP.
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PLL tune & coupling feedback (real time coupling signal)
Beam-Beam (present proton limit, strong-strong like LHC)
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Long range beam-beam compensation (with wires)
Head on beam-beam compensation (with an electron lens)
E-cloud studies (present heavy ion limit)
Non linear IR corrections
HI collimation and beam loss studies
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LHC type electron detectors in IR10 for detailed e-cloud studies
Phobos magnet
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Warm Dipoles
TWC
Electron Detector
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IP
5m
Existing concrete stands
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study e-cloud formation with and w/o
dipole field
much higher sensitivity than the RHIC type
detectors
focus on surviving electrons in gaps and fill
pattern optimization
approved for APEX time during this run in
FY06 (polarized protons)
collaboration BNL (A. Drees, D. Hseuh et
al. ) and CERN (M. Jimenez et al.)
Bound-free Pair Production (BFPP) Measurement at RHIC
Ions after e-capture can cause a “hot-spot” at a location downstream of the IR
=> potential problem at the LHC
First attempt to measure the cross section at RHIC (A. Drees, W. Fischer,
J. Jowett et al.)
IR
simulation
point of impact
count rate @
local loss monitor
when collisions
start
~ 8 Hz
cross section measurement
using vernier scan technique:
sBFPP = 0.97 mb (prelim.)
(pred.: 0.15 mb)
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Loss Maps and Luminosity Monitors
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fast and rad. hard LHC type luminosity monitor (ionization
chamber) is installed in IR10
collaboration between BNL and LBNL (A. Ratti et al.),
approved for APEX time this year
1st use “in the field” this year in RHIC, calibration with
existing luminosity detectors (ZDCs).
Loss maps for HI and protons (code benchmarking)
collaboration between BNL (A. Drees) and CERN (R.
Assmann et al., H. Braun et al.)
Comparison ICOSIM (black) with BLM data during gap cleaning
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1st attempt to
predict loss maps
for HI in RHIC
(and later LHC)
and to compare
with data
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2.5
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1.5
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0.5
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-100
-50
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Log of losses (arb. units)
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7 (m)
distance from PHENIX
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BNL LARP Accelerator Physics Program
LHC will be very vulnerable to
transients in the energy ramp
NEED FEEDBACK for
- closed orbits (CERN)
- tune (LARP)
- chromaticity (LARP)
Recent results from RHIC show
“military precision” in
maintaining desired tunes
Tune & coupling feedback
system (4 variables) shows
collaborative benefits to all:
BNL + CERN + FNAL
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BNL LARP Accelerator Physics Program
Decoupling success
Coupling feedback allows
UNPRECEDENTED
proximity of the two
tunes (0.0007 at left)
The crux has been
passed (?) in the quest
for chromaticity
feedback.
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BNL LARP Accelerator Physics Program
LARP AP is and will continue to be an effective mechanism to provide US
expertise towards supporting the LHC program
BNL personnel are playing a major role in this process. Many on-going
collaborations with CERN and the other US labs
RHIC is able to provide a developmental environment for many LHC sub-systems
without the problems of start-up conditions
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