1. A. Tsinganis, F. Cerutti (EN/STI/FDA)
Energy deposition in the Matching Section (v1.2): short summary on D2/Q4
A. Tsinganis, F. Cerutti (EN/STI/FDA)
WP3 Meeting – March 9, 2016

2. Overview Energy deposition study in the matching section (up to Q7)
Optics version HL-LHCV1.2
All collimators in place
Round optics
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

3. Apertures (changes wrt optics v1.1)
Significant elements
Apertures (changes wrt optics v1.1)
TAXN: 80mm  85mm
D2 correctors: 100mm  105mm (same as D2)
Q4 correctors: 100mm  90mm (same as Q4)
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

4. Peak power density (vertical crossing)
Peak power density below design values
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

5. Peak dose (Lint=4000fb-1) (vertical crossing)
Values below 20MGy…
…except for the first Q4 corrector, where a peak of 30-35MGy is expected
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

6. Peak dose (Lint=4000fb-1) (vertical crossing)
Peak in Q4 H corrector (MCBYYH) is very localised
The increased value is attributable to:
The reduced aperture (100mm  90mm)
The increase in the TAXN aperture (now 85mm)
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

7. Summary
Peak power and dose values generally well within acceptable limits
Localised peak in MCBYYH ~30-35MGy
Related to aperture reduction and to TAXN aperture increase
Integration issues in the TAXN-D2 region:
May lead to displacement of TAXN in the IP direction, with corresponding aperture adjustment
Removal of TCTs (with TAXN displacement and aperture adjustment) would leave the coils in the outgoing bore exposed (especially for vertical crossing)
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

9. Extra material
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

10. Total power for L=7.5L0 (vertical crossing)
Magnets
Magnet cold mass
Beam screen (b1/b2)
Power [W] D2 24
1.3 / 0.1
D2 H
1.8
0.2 / 0.005
D2 V
1.6
Q4 H 10
1.4 / 0.06
Q4 V
5.4
0.6 / 0.07 Q4
7.3
0.8 / 0.1
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

11. Peak power density (horizontal crossing)
Peak power density below design values
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

12. Peak dose (Lint=4000fb-1) (horizontal crossing)
Beam 1
Values below 20MGy…
…except for the first Q4 corrector (here not evaluated), where a peak of up to ~30MGy is expected
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT

13. Total power for L=7.5L0 (horizontal crossing)
Magnets
Magnet cold mass
Beam screen (b1/b2)
Power [W] D2 50
2.5 / 0.1
D2 H
2.2
0.2 / 0.005
D2 V
1.4
0.2 / 0.004
Q4 H 11
1.3 / 0.03
Q4 V
4.6
0.8 / 0.03 Q4 10
1.4 / 0.1
Energy deposition in the Matching Section (D2 - Q4) | WP3 Meeting | March 9, 2016 | AT