FLUKA status and plan Sixth TLEP workshop CERN, 16 -18 October 2013
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Transcript of FLUKA status and plan Sixth TLEP workshop CERN, 16 -18 October 2013
FLUKA status and plan Sixth TLEP workshop
CERN, 16 -18 October 2013
F. Cerutti#, A. Ferrari#, L. Lari*, A. Mereghetti##EN Dept. & *BE Dept.
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Outline
1. A few reminders about Synchrotron Radiation
2. FLUKA implementation3. Some geometrical considerations4. Results5. Conclusions & Future works
October 17th, 2013
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SR Emission
October 17th, 2013
Presented by A. Ferrari at the 4th TLEP workshop (April 2013)
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SR Emission
October 17th, 2013
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Fluka implementation of SR
October 17th, 2013
For more details see A. Ferrari at the 4th TLEP workshop (April 2013)
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Ee- =175 GeV 80km machine; Radius at the dipole = 9.8 km 81% Bending
Magnets; Ecrit= 1.21 MeV; E= 9 GeV/turn,
dE/ds=1.39 keV/cm in the dipoles P = 9 x I[mA] MW = 9 x 10mA = 90 MW in the whole
accelerator; dP/ds= 1.39 x I[mA] W/cm in the dipoles
SR photons generated and tracked above 100 eV (99.999% of the total power), average energy of the photons <E>=400 keV (E>100 eV) ;
Assumed parameters
October 17th, 2013
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The starting idea
October 17th, 2013
Presented by A. Ferrari at the 4th TLEP workshop (April 2013)
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Preliminary layout of 1 FODO cell for TLEP
October 17th, 2013
1/2
Quad
.
1.5m
Qu
ad.
1/2
Quad
.
~21.3m long dipole
~21.3m long dipole
Courtesy B. Holzer
Circumference of 80km !!!
50 c
m S
ext.
50 c
m
Sext
.50
cm
Se
xt.
50 c
m
Sext
.
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Preliminary layout of 1 FODO cell for TLEP
October 17th, 2013
10.5m Dipole
10.5m Dipole
10.5m Dipole
10.5m Dipole
50 m
50m -4*10.5m -2*1.5m -4*0.5m= 3 m
3/10 =0.3m each interconnect
1.5m
Qu
ad.
Note that Sextupoles were not yet considered in the
actual Fluka model
1/2
Quad
.
1.5m
Qu
ad.
1/2
Quad
.
~21.3m long dipole
~21.3m long dipole
50 c
m S
ext.
50 c
m
Sext
.50
cm
Se
xt.
50 c
m
Sext
.
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Preliminary layout
October 17th, 2013
Courtesy A. Milanese
Courtesy R. Kersevan
Not yet an available quad. design but the B yes!
Courtesy B. Holzer
2 proposed materials for the
beam pipe
EPOXY
Updated cooling H2O channel
ID 16mm
30 cm
30 c
m
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10.5 m long dipole for 1 Beam line
October 17th, 2013
Beam pipe without shielding (no lead) but
with cooling water channel
TLEP 80 km
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FLUKA model: summarizing
October 17th, 2013
10.5m Dipole
10.5m Dipole
1.5m Quadrupole implemented just as the analytical magnetic field
0.3 m
0.3 m
5* 24 cm long Absorbers
0.3 mCentered
S S
0.3 m 0.3 m
25 mmCu-OFS (0.085% Ag)
(20:10)
QD
Lead
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Total power
October 17th, 2013
All results take into account a Beam current = 10 [mA]
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H2O channel
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Dipole Dipole S SAbs Abs Abs Abs AbsQ
Power in the H20 for all the ABSORBERS: 14.7 W (shield) and 4.5 W (no shield)
Power in the H20 for all the MAGNETS: 6.7 W (shield) and 87 W (no shield)
39 W 42 W 6 W0.9 W 0.9 W 0.9 W 0.9 W 0.9 W
1.7 W 4.9 W 0.1 W7 W 7.2 W 0.16
W0.2 W 0.05
WHeating of the in-pipe shield: need to move
the H2O channel further in ?
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Power density in the dipole beam-
pipe
October 17th, 2013
Averaged along the Dipole length
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Peak power density in the dipole beam-pipe
October 17th, 2013
Dipole length [cm]
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Dose in the coils
October 17th, 2013
Averaged along the Dipole length
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Peak Dose on the coils
October 17th, 2013
Mask?
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Ozone production
October 17th, 2013
Adapted from NCRP Report 51, under the assumption of no O3 dissociation over the air renewal time vent :
vent
vent
tvent
O
venteV
Air
AirAvO
t
Air
AirAv
venteVoO
VsPC
rPP
NTPP
NGC
PVN
PGCC
e1][cm
][[W]103.47 [ppm]
renewal/s][air 1[W]1024.6 [eV/s]
]/cm[molecules1050.2@eV]/[O06.0232.0
e1
33
18
3193
3
2
2
3
For example, for P=10 W, V108 cm3, vent10 h at saturation CO312 ppm
Corrosion of the materials?
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For SR emission the effects of absorbers were shown for the 80km TLEP option. A considerable reduction of the power deposited
into the dipoles, in particular thanks to the absorbers immediately downstream of the dipoles.
Not a critical integrated energy into the water channels with and without absorbers.
A factor of 10 difference with and without absorbers for the power density in the dipole beam pipe and for the dose on the coils. Masks?
Ozone production has to be carefully considered for limiting the corrosion of the materials. Limits?
Conclusions
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Future work
October 17th, 2013
Possible follow-up: Other magnets design for dipoles, quadrupoles
and sextupoles.
Following impedance considerations, an updated version of the in-pipe shielding with possible different integration of the water cooling channel into the absorbers.
Changing the orientation of the dipoles could be a gain for the ozone but not for the coils.
See also L. Rossi at the 3rd TLEP workshop (January 2013)
TLEP 80 km