Recap of heat loads and peak doses from HL-LHC Q1 to Q7

L.S. Esposito, F. Cerutti

HL-LHC WP3 meeting, 22 May 2014

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

Beam Screen design evolution1

6 m

m

ab

sorb

ers

6 m

m

ab

sorb

ers

old version (BS #1)

new version (BS #2)

1. cooling capillary (tube) size

2. absorber shape3. INERMET 180 4. beam screen

thickness (2⇒1 mm)

2

BS #3

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

IT-D1: vertical crossing

3

BS#2, 50 cm gap in ICs

BS#2, 10 cm gap in ICs

BS#3, 50 cm gap in ICs

Power [W]@ 5 × 1034 cm-2

s-1

Magnetcold mass

Beamscreen

Magnetcold mass

Beamscreen

Magnetcold mass

Beamscreen

Q1A + Q1B 110 150 110 150 110 150Q2A + corr 105 50 105 50 105 55Q2B + corr 130 70 130 65 130 70Q3A + Q3B 160 60 160 60 150 70

CP 70 45 65 45 65 50D1 100 50 95 50 90 55

Interconnects 25 85 25 95 25 90

Total 700 510 690 515 675 535

Total values for horizontal crossing are about 10% lower

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

Matching Section: horizontal crossing

4

Power [W]@ 5 × 1034 cm-2 s-1

D2 Q4 Q5 Q6 Q7

Mask length[cm]

100 50 100 50 0 100 50 100 50 100 50

Q5 aperture[mm]

- - 90 90 70 90 90 70 90 70

magnets 45 64 5.5 6 7 5.5+2

6+2 7 3 3 2.4 2+

22+

21.3+0.

6

correctors 3+2 3+2 3+2+1.5

5+2+2

8+3+2 0.5 0.5 0.5 0.2 0.2 0.1 0.5 0.5 0.2

collimator 75 65 - - - 220 215 220 85 75 70 - - -

masks(B1+B2)

20+4

10+2 16+1.5 12+1 - 9+1.

51+

113+2

.53.5+3

.52.5+2

.51.4+1

.7 - - -

• TAN intercepts ≃1kW (+20% for vertical crossing)• Heat budget going into beam screen ≲ 10%• Being the layout under definition, these figures should be taken as a rough

estimation

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

Peak dose and peak power density

5

BS #3 Q1A Q1B C1 Q2A Q2B C2 Q3A Q3B C3 D1

Peak power density

[mW/cm3]@ 5 × 1034 cm-2

s-1

0.7 1.1 1.1 2.0 2.5 2.5 2.5 2.2 1.1 1.3

Peak dose[MGy/3000fb-1] 8 11 25* 22 32 28 29 33 44* 15*in the vertical plane (i.e. outside

the coil)

50cm masks, 70mm Q5 D2 D2

corrQ4corr Q4 Q5 Q5

corr Q6 Q6 corr Q7 Q7

corr

Peak power density

[mW/cm3]@ 5 × 1034 cm-2

s-1

1.8# 0.4 0.6 0.3 0.8 0.1 0.3 <0.1 0.2 0.1

Peak dose[MGy/3000fb-1] 36# 4 20 8 ~20 2 3 2 5 6#TCL4 at 20σ

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

Intercomparison with MARSN. Mokhov, I. Rakhno, I. Tropin

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

Integral power

10 cm gap in ICs 50 cm gap in ICs 50 cm gap in ICs

Power [W]@ 5 × 1034 cm-2

s-1

Magnetcold mass

Beamscreen

Magnetcold mass

Beamscreen

Magnetcold mass

Beamscreen

Q1A + Q1B 100 175 100 170 97 172

Q2A+orb corr 95 60 100 65 99 65

Q2B+orb corr 115 80 120 80 117 81

Q3A + Q3B 140 80 140 80 137 75

CP 55 55 60 55 60 65

D1 90 60 90 60 90 56

Interconnects 20 140 20 105 15 86

Total 615 650 630 615 615 601

MARSFLUKA

BS #1 (for intercomparison purposes)

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

Peak power density

BS #1 (for intercomparison purposes)

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

Peak dose

BS #1 (for intercomparison purposes)

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014

In word• Fine tuning of the new beam screen and interconnect (BPM) design plays an

important role in determining peak dose values along the triplet-CP string

• Looking forward to implementing a realistic orbit corrector design

• TAN-TCL-TCAX set-up is presently under iteration to protect the matching section

Back to numbers

At 5L0 700 W in the IT-D1 cold masses, 550 W on the beam screen. ~50 W in the D2.

In the coils: Peak power densities below 3mW/cm3; Peak dose maxima around 30 MGy

per 3000 fb-1 (DPA reaching the 10-4 - 10-3 range).