siriusuvx lnls – national synchrotron light laboratory cnpem – brazilian center for research on...
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SiriusSirius
UVXUVX
LNLS – National Synchrotron LNLS – National Synchrotron Light LaboratoryLight Laboratory
CNPEM – Brazilian Center for CNPEM – Brazilian Center for Research on Energy and Research on Energy and MaterialsMaterials
A R Rodrigues, M Lisboa, A R Rodrigues, M Lisboa, R Madacki R Madacki CNPEMCNPEM
Siriusthe next LNLS synchrotron light source
Storage Storage ringring
BoosterBooster
LINACLINAC
Partially removable roof Partially removable roof for ID and frontend for ID and frontend installation installation
10 chicanes10 chicanes
Siriusthe next LNLS synchrotron light source
Parameter Value Unit
Energy 3.0 GeV
Maximum current 500 mA
Circumference 518.25 m
RF frequency 500 MHz
Straight sections (SS),number x length
10 x 7 10 x 6
m
m
Emittance (without IDs) 0.28 nm.rad
Harmonic number 864
Bending field (dipoles / ”superbends”) 0.58 / 2.0 Tesla
Critical energy from “superbends” 11.7 keV
Beamsize @ superbend, HxV 11 x 4.0 μm2
Beamsize @ short SS, HxV 33 x 1.4 μm2
twenty-fold 5-bend achromat
Storage ring specifications
Parameter Multi-bunch Single-bunch
Energy 150 150 MeV
Relative energy spread (rms) < 0.5 <0.5 %
Pulse charge > 3 > 1 nC
Pulse width 100 to 300 < 1 ns
Repetition rate 2 2 Hz
LINAC specifications
Parameter
Extraction energy 3.0 GeV
Injection energy 150 MeV
Current 2.0 mA
Circumference 496.8 m
Revolution period 1.66 μs
Cycling frequency 2 Hz
Harmonic number 828
Booster specifications
septasepta
Storage ringStorage ring
BoosterBooster
LINACLINAC
Storage ring150 MeV Linac 3 GeV Booster
Injection system
Booster
3 GeV Storage ring
150 MeV LINAC
Critical spots:•BI – booster injection (150MeV)•BE – booster extraction•SI – storage ring injection
Bulk shielding for the injection region
Copper vacuum Copper vacuum chamberchamber26 mm,26 mm,1mm wall1mm wall
Booster ejection local shielding 15 cm steel
Synchrotron radiation
collimator(steel)
Chicane
Concrete 2.35 g/cm³
Bulk shielding geometry used in simulations
FLUKA simulations
Injection losses at each septum in topup mode (localized)
Septum LossesElectron energy
Incoming electrons
Incoming power
Expected losses at this point
[GeV] [e¯/h] [W] [e¯/h] [W]
BI 20% 0.15 3.3E+12 0.022 6.6E+11 0.0044BE 20% 3.00 2.1E+12 0.281 4.2E+11 0.0562SI 20% 3.00 1.7E+12 0.225 3.4E+11 0.0450
BI: booster injection septumBE: booster extraction septumSI: storage ring injection septum
Lifetime and ramp losses (distributed)
Electron energy Expected losses [GeV] [e¯/h] [W]
Storage ring 3.00 1.3E+12 0.180Booster 0.15 to 3 GeV 6.6E+11 0.088
Estimated electron losses
worst case (3 GeV)
Injection losses inside the SR/booster tunnel during normal operation (topup)
6.6E+11 e¯/h1.3E+12 e¯/h
5.3E+11 e¯/h
3.4E+11 e¯/h
4.2E+11 e¯/h
Estimated electron losses
FLUKA x Swansonwithout steel local shielding
Swanson 0.2 μSv/h
FLUKA 0.2±0.1 μSv/hWith 4.2e+11e¯/h on the target
Simulations with FLUKA
Booster ejection Booster ejection without the local without the local shielding shielding
BEBE
Swanson* 43 μSv/h
FLUKA** 8.8±1.0 μSv/hWith 4.2e+11e¯/h on the target*Thick target** 2mm thick copper chamber
Without steel plate 1.7±0.6 μSv/h
With steel plate 1.1±0.2 μSv/hWith 4.2e+11e¯/h on the target
Dose-eq [pSv/e¯]Effect of the 15 cm steel plate (FLUKA)
Without steel plate 8.8±1.0 μSv/h
With steel plate 1.7±0.2 μSv/hWith 4.2e+11e¯/h on the target
Simulations with FLUKA
Chicane
Chicane with steel plate shield 0.05±0.01 μSv/h
15 cm steel plate15 cm steel plate
ChicaneChicane
Simulations with FLUKA
Tunnel chicane
RF cavity waveguide chicane
FLUKA simulations
Waveguide chicaneWaveguide chicane
Waveguide chicane with steel plate shield
0.2±0.06 μSv/h
• Preliminary situation• Dose limit goal: 1 mSv/yr for all workers• Accidents: local shielding • Calculations and strategies are going on