the fidel project
DESCRIPTION
The FiDeL Project. L.Bottura following several, long brainstorming sessions with L. Deniau, J.P. Koutchouk, M. Lamont, N. Sammut, L. Walckiers, R. Wolf MARIC - March 1st, 2006. Outline. Context Aim of the FiDeL project FiDeL Concept Generation of sets of parameters Use of FiDeL - PowerPoint PPT PresentationTRANSCRIPT
The FiDeL Project
L.Bottura
following several, long brainstorming sessions with
L. Deniau, J.P. Koutchouk, M. Lamont, N. Sammut,
L. Walckiers, R. Wolf
MARIC - March 1st, 2006
Outline Context Aim of the FiDeL project FiDeL Concept Generation of sets of parameters Use of FiDeL AT involvement Project definition
Reminder: magnetic re-set cycles
magnetic databases
survey database
geometry database
LHC layout
optics definition
magnet sequence
virtual LHC (MAD)
LHC control system
LHC configuration databases
magnetic field data
geometry data
survey data
magnetic field trims
geometry trims
survey trims
field model
field model
The helicopter viewAB ?
TS-IC
AT-MASAT-MELAT-MTM
AT-MASAT-MTM
TS-SU
TS-SU
AB-OP
AB-ABP
AT contribution
FiDeL
Background On magnetic references for the LHC:
No need to have reference magnets in the tunnel (DEWG 1996) Idea of a magnetic reference for the LHC including a magnetic
model (COOP Forum, December 1999) No need to have reference magnets (RMS Review, July 2004) Field Model definition (Chamonix 2005, PAC 2005)
On models for beam optics: MAD model including measured field errors (AB-ABP & al., 2005) MAD model including measurement uncertainties (Chamonix
2006) On LHC control:
Field Model specifications included in a prototype of the ramp generator (Chamonix 2006)
Aim of the FiDeL Project A Field Description of the LHC to:
Describe the magnetic state of the LHC Provide settings in the main magnets (MB, MQ,
MQM, MQY, MQXx) and in the corrector circuits to prepare the LHC for injection, program the ramp, and reach known and corrected coast conditions
Provide trims for correction circuits during constant current plateaus, and especially to follow the field drift at injection
Provide trims for correction currents during the energy ramp, and especially during the snap-back at the beginning of the acceleration
FiDeL Concept Field Model
Unified description of the field and field errors Cn applicable to all LHC magnets
Set of parametric equations for 7 physical components
Geometric Persistent Saturation Residual magnetization Decay Snap-back Ramp
Field parameters Adapt the parametric equations
to fit the measured or expected behaviours of the magnets
Set of ≈20 parameters, classified in 2 categories:
Shape parameters, equal for all magnets of the same type and family (e.g. all MB’s with inner cable 01B)
Amplitude parameters, specific to each magnet (e.g. geometric Cn)
FiDeL
Phys.Rev. Special Topics, Accelerators and Beams, 9, 012402, 2006
Generation of parameters
cold MM
correctors warm MM
produce list of slots for the given circuit
produce list of magnets for the given cicuit
retrieve magnetic model parameters for each magnet in the circuit
integrate model parameters over the
circuit
Circuit Parameters
Magnet Parameters
circuit_ID
circuit_ID,{slot_ID}
circuit_ID,{slot_ID, magnet_ID}
circuit_ID,{slot_ID, magnet_ID, parameter_set}
circuit_ID, parameter_set
dictionary of magnet type and magnet family
magnet_ID
magnet_ID, magnet_type, magnet_family
Field Parameters
p pmagnet_family,
magnet_ID
circuit
{slot_ID}
slot_ID
magnet_ID
magnet_type, magnet_family,
pmagnet_family, magnet_ID
main ring warm MM
parametrization of field data
LHC layout
MTF slots
2. tools to build and store the
LHC configuration
1. synthesis of measured data
3. generation of the
parameter set
Use of FiDeL - LHC control
Circuit Parameters
Generate ramp for
main ring magnets
Bm / Im
Cn(I,t,dI/dt,I(-t))
Im / cn
Cn(I,t,dI/dt,I(-t))
Bn / In
Cn(I,t,dI/dt,I(-t))
Optics
Error forecast
Generate ramp for
corrector magnets
Bm(t) Im(t)Im(t) cn(t) Bn(t) In(t)
correctionstrategy
Use of FiDeL - Optics studies
Magnet Parameters
Ramp setting
Bm / Im
Cn(I,t,dI/dt,I(-t))
I / cn
Cn(I,t,dI/dt,I(-t))
Optics
Error forecast
Bset(t) I(t)Iset(t) cn(t)
ILHC(t)
MAD
AT involvement Short term (2006 to sector test/commissioning)
Define and validate the model Create a common data structure Collect, prune, and complement data for all magnet types Generate the configuration sets from the circuit and machine layout
Medium term (2007-2008) Participate in the implementation and test of the LHC configuration and
control system Prepare for commissioning through studies of the effect of magnetic
uncertainties (within the scope of FQWG) Adapt the parameters sets and create parameters trims tables during
sector test/commissioning Define, perform and analyse measurements on off-line benches in SM-
18 (see: FaMe) Long term (> 2008)
Maintain data structures, tools and settings Participate/motivate MD and dedicated field measurements to optimise LHC
operation
FiD
eLA
T ?
When ? Proposal based on validation test during
sector test
Who ? Mandate the FQWG to
Complete the definition of the project (interfaces, responsibilities, deliverables)
Compile above in a RDD to be agreed with AB-OP (LHC controls) and AB-ABP (MAD)
Propose participation of AT groups (MEL/MAS/MTM are natural candidates)
Provide the structure for coordination and follow-up of progress
Spin-off the team that will be in charge of the LHC magnetics
Topics for discussion OK on the short and medium term ?
Clarify the frame for the long term contribution of AT to the LHC operation and optimization, to provide a defined boundary for the exploitation of FiDeL
FiDeL “components”
Seven components of different physical originto describe the field and field errors
In addition: residual magnetization and ramp (not visible above)
MB parameters for sector 7-8
Work in progress for decay/SB parameters
Integrated B1 in sector 7-8
Aim: Bdl = 1189.2 Tm for injection at 450 GeV
Iterate:
Bdl/154 = TF(I) Iset
Result:
TF = 10.118(0) Tm/kA
Iset = 763.2(0)
Plan for main optical elements in sector 7-8
Plan for correctors/trims in sector 7-8