1.
Region between TAXN and D2 in HL-LHC IR1/5: Implications on Collimator Design
Alessandro Bertarelli, L. Gentini (EN/MME)
On behalf of the LHC Collimation Team
HiLumi LHC Goes To Industry Workshop CERN, Geneva, Switzerland – 26 June, 2015

2. Layout Overview HL-LHC Collimators between TAXN and D2
Layout Overview
HL-LHC Collimators between TAXN and D2
Preliminary design studies on TCTPH, TCTPV and TCLx started in EN/MME (L. Gentini) in December
A. Bertarelli, L. Gentini EN/MME th ColUSM

3. Specifications and Constraints
HL-LHC Collimators between TAXN and D2
TCTPH
TCTPV
TCLx
Orientation
Horizontal
Vertical
Absorber Material
Inermet IT180
Absorber Cross-section
34 x 20 mm2
70 x 40 mm2
Jaw Stroke
30 (+5) mm
40 (+5) mm
Interference* with present layout
43 mm
11.3 mm
58.1 mm
* Interference calculated assuming a standard collimator tank and including baking equipment thicknesses (tank jacket thickness 25 mm and/or vacuum chamber wrapping 5 mm) and a ID/OD 90/94 mm vacuum chamber
Source: A. Rossi (BE/ABP) N. Joannon (EN/ACE)
A. Bertarelli, L. Gentini EN/MME th ColUSM

4. TCTPH – Interference in present layout
HL-LHC Collimators between TAXN and D2
A. Rossi (BE/ABP)
N. Joannon (EN/ACE)
A. Bertarelli, L. Gentini EN/MME th ColUSM

5. Thicker Back-stiffener
TCTPH – Slim Jaw Design
HL-LHC Collimators between TAXN and D2
Slim jaw design: Thickness optimization of jaw assembly allows saving 10 mm per side, keeping same jaw functionality
This translates into a 20 mm reduction of the tank width
New design of sliding tables is required (reduced span)
Still not enough to cancel off interference (8 mm more to go assuming an “all-embracing” heating jacket)
Slim Design
Standard Design
Axle offset inward 10mm
Thicker Back-stiffener
A. Bertarelli, L. Gentini EN/MME th ColUSM

6. TCTPH – “All-embracing jacket”
HL-LHC Collimators between TAXN and D2
A. Bertarelli, L. Gentini EN/MME th ColUSM

7. TCTPV HL-LHC Collimators between TAXN and D2
Longer stroke (40 mm) translates into larger tank (+ 20 mm). This does not appear to be an issue; otherwise, slim jaw design can be adopted keeping present tank width unchanged.
New larger bellows required.
New sliding table design (different from TCTPH’s)
11 mm interference not yet addressed (e.g. possible piping re-routing?)
A. Rossi (BE/ABP)
N. Joannon (EN/ACE)
A. Bertarelli, L. Gentini EN/MME th ColUSM

8. TCLX - Interference in present layout
HL-LHC Collimators between TAXN and D2
A. Bertarelli, L. Gentini EN/MME th ColUSM

9. TCLX HL-LHC Collimators between TAXN and D2
Large interference (up to 58 mm) forces to have a 2-in-1 design
Preliminary proposal to be further optimized:
L. Gentini (EN/MME)
A. Bertarelli, L. Gentini EN/MME th ColUSM

10. Thicker and higher absorbers (40x70)
TCLX
HL-LHC Collimators between TAXN and D2
Ad-hoc jaw. Structural design to be checked.
New sliding table
Thicker and higher absorbers (40x70)
L. Gentini (EN/MME)
A. Bertarelli, L. Gentini EN/MME th ColUSM