evaluation of radiation to machine components and equipment
DESCRIPTION
HL-LHC Standards and Best Practices Workshop June 13, 2014. EVALUATION OF RADIATION TO MACHINE COMPONENTS AND EQUIPMENT. M. Brugger , F. Cerutti , L.S. Esposito, A. Ferrari, A . Lechner , A. Mereghetti , N. Shetty, E. Skordis , V. Vlachoudis - PowerPoint PPT PresentationTRANSCRIPT
EVALUATION OF RADIATION TO
MACHINE COMPONENTS AND
EQUIPMENT
HL-LHC Standards and Best Practices WorkshopJune 13, 2014
M. Brugger, F. Cerutti, L.S. Esposito, A. Ferrari,
A. Lechner, A. Mereghetti, N. Shetty, E. Skordis, V.
Vlachoudis
N. Mokhov, I. Rakhno, I. Tropin
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QUITE A BIT OF ENERGY
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
9.5 kW delivered in collisions (L=5L0)
on each side of ATLAS and CMS, a 54mm aperture TAS absorber takes 500Wand let 3.5kW impact the machine
54 mm
5 mm
21 m
by design, up to 500 kW can impact the primary collimators (in IR7)
700 MJ per beam (7 TeV protons, 2.2 1011 p per bunch, ~2800 bunches)
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WHICH IMPACT
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
radiation sources: regular collisions, collimator cleaning, beam-gas interaction
various accident scenarios (e.g. UFO)
Heating, stress energy (power) deposition
Degradation energy (dose) deposition, particle fluence, DPA
Monitor response energy (dose) deposition (→ charge collection), particle fluence
Background particle fluence
Electronics high energy hadron fluence, neutron fluence, energy (dose) deposition
Activation residual activity and dose rate
thermomechanical analysis where needed
S. Roesler’s talk
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FROM MICROSCOPIC …
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
interplay of many physical processes described by different theories/models
integrated in a Monte Carlo code
multiple scattering
hadron-nucleusreaction
particle decay
low energy neutronreaction
ionization
electromagneticshower
6 GeV proton in liquid argon
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… TO MACROSCOPIC
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
proton beam on a 1 m long and 10 cm radius copper rod
160 MeV 7 TeV
LINAC4 and LHC
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MACHINE MODEL
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
in principle any relevant object can be implemented to a meaningful detail
FLUKA Element Database
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LINE BUILDER
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
IR7, generated from the optics lattice
A. Mereghetti et al., IPAC2012
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IR1
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
Tracking accuracy within one micronover several hundred meters in a 3D geometry
with various magnetic fields
Long Straight Section and Dispersion Suppressor Right of ATLAS
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HL-LHC IR IN FLUKA
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
beam screen gap (10 or 50 cm)in the middle of the interconnects
CPD1
Q3TAS
150mm(coil) aperture
10F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
HL-LHC IR IN MARS
D1
Q3
Q2BQ2A
Q1TAS
CP
IP
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DOSE TO THE BEAM SCREEN
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
several hundred MGy over the machine lifetime
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QUADRUPOLES, CORRECTORSAND SEPARATION DIPOLE
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
dose in the coils
critical dependence on the actualInermet shielding shape and gaps
700 W in the cold masses + 550 W in the beam screen + 1.2 kW in the TAN
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NOT HOMOGENEOUS DISTRIBUTION
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
[GeV/g per collision]
monitor signal
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BLM MEASUREMENTS AND SIMULATIONS
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
[† input from V. Chetvertkova et al.]
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LOOKING FARTHER FROM THE BEAM
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
Power Supply 24VDC 5A
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RADIATION EFFECTS ON ELECTRONICS
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
Intermediate energy neutrons: low energy elastic/inelastic products
Inelastic interactions
Thermal neutrons:n+10B→7Li+4He
Low energy charged hadrons: direct ionization (relevant for very sensitive technologies)
17F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
relevant physical quantitythe effect is scaling with
Single Event effects
(Random in time)
Single Event Upset(SEU)
Memory bit flip (soft error)Temporary functional failure
High energy hadron fluence [cm-2](but also thermal neutrons!)
Single Event Latchup
(SEL)
Abnormal high current state Permanent/destructive if not protected
High energy hadron fluence [cm-2]
Cumulative effects
(Long term)
Total Ionizing Dose(TID)
Charge build-up in oxideThreshold shift & increased leakage currentUltimately destructive
Ionizing dose [Gy]
Displacement damage
Atomic displacements Degradation over time Ultimately destructive
Silicon 1 MeV-equivalentneutron fluence [cm-2]{NIEL -> DPA}
RADIATION EFFECTS ON ELECTRONICS
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TEST, MONITOR, MITIGATE AND PREDICT
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
Numerous systems with commercial components are affected(powering, control, cooling, monitoring, etc.), several are critical for beam operation, some have to be located in “high-radiation” areas
Presently about 50 different system, half of them undergoing new developments, others upgrades.Number of parts per system range from a few to a some thousand
Reliability = low number of failures → short down-times!
devicesdevicesfailures NXxNdxxxN )(~)()(
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BEST PRACTICES
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
Radiation tests are a phase of a new component developmentRadiation constraints to be considered from day-0
REQUIREMENTS
Electrical system
Radiation environment and effects
Timeline
Com
plex
ity
DESIGN
Specifications
SelectionDesign
Time
TESTSystem
ComponentQualification
PROCUREMENT
Test boardsPrototypeProduction
20F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
LOOKING FARTHER FROM THE IP
D2: 65 Win its Nb-Ti coils peaks of 2 mW/cm3 @ 5L0 and 35
MGy /3000 fb-1 (to be improved)
protection based onthe TAN absorber, TCL debris collimators and tungsten masks
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ANOTHER ELECTRONICS ALCOVE
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
FH>20MeV [cm-
2](L2012)
5RM08S 5RM09S
FLUKA 6.1 108 3.0 107
DATA 4.56 108
(256 upsets)4.32 107
(25 upsets)Agreement within 30%
23 fb-1 @ 4+4 TeV
250 m downstream CMS
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CONCLUSION
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop
Currently used physics and geometry models allow to reliably simulate secondary particle showers to many purposes (beam intercepting device design, cold and warm magnet protection, monitoring, radiation to electronics, operation assistance, background, …, activation*). *next talkThink about the radiation field and let us know if you need its characterization.Systematic uncertainties imply to consider suitable design margins.
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WHATEVER
F. Cerutti June 13, 2014 HL-LHC Standards and Best Practices Workshop