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

October 17th, 2013

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

October 17th, 2013

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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