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

Siriusthe next LNLS synchrotron light source

Building occupation

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

Bulk shielding geometry used in simulations

FLUKA simulations

RF waveguide passage

Chicane

FLUKA simulations

Bulk shielding geometry used in 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

• Thank you very much for your attention!

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