1. Update on beam screen issues
WP3 Meeting, 5 Nov 2013
WP3 – Magnets for Insertion Regions
Update on beam screen issues
Roberto Kersevan
TE-VSC-IVM

2. - Preliminary design of the beam screen (BS) for the Q1 and Q2-Q3- D1 areas - Preliminary design of the Tungsten* shielding (* Inermet 180, Plansee)
12/6/2018
WP3 – Magnets for Insertion Regions

3. HL-LHC TRIPLET LATTICE BPMs
White bands: allowed BPM installation areas
E. Todesco
12/6/2018
Proposed BPM locations
R. Jones
HL-LHC PLC Jan 2013
Current BPM locations
WP3 – Magnets for Insertion Regions

4. What if increased shielding at Q1?
12/6/2018
L. Esposito
Reduction of the beam screen diameter at Q1 proposed by S. Fartoukh with corresponding increase of the W shielding to reduce radiation dose.
WP3 – Magnets for Insertion Regions

5. Interconnects: margins on no W shielding length of BS
12/6/2018
= 438 mm seems the bare minimum 
Taper: 15 degrees slant?
WP3 – Magnets for Insertion Regions

6. Heat Loads: collision debris
12/6/2018
WP3 – Magnets for Insertion Regions

7. Heat Loads: Image currents at resistive wall
See presentation by N. Mounet, EPFL-CERN
@CERN-LARP Meeting, Daresbury
“Transverse impedance and stability limits in the HL-LHC era (including flat bunches from 800 MHz) for the proposed collimator settings”, WP2 Joint session
12/6/2018
WP3 – Magnets for Insertion Regions

8. Heat Loads: e-cloud
12/6/2018
WP3 – Magnets for Insertion Regions

9. Luca Dassa, Rafael Fernandez Gomez, EN-MME-ES
Preliminary design of the beam screen (BS) for the Q1 and Q2-Q3-D1 areas.
12/6/2018
Luca Dassa, Rafael Fernandez Gomez, EN-MME-ES
WP3 – Magnets for Insertion Regions

10. Luca Dassa, Rafael Fernandez Gomez, EN-MME-ES
Preliminary design of the beam screen (BS) for the Q1 and Q2-Q3 areas (D1 on the “to do”list).
12/6/2018
Luca Dassa, Rafael Fernandez Gomez, EN-MME-ES
WP3 – Magnets for Insertion Regions

11. Luca Dassa, Rafael Fernandez Gomez, EN-MME-ES
Preliminary design of the beam screen (BS) for the Q1 and Q2-Q3 areas (D1 on the “to do”list).
12/6/2018
16mm
6mm Q3, D1(?)
Luca Dassa, Rafael Fernandez Gomez, EN-MME-ES
WP3 – Magnets for Insertion Regions

12. Short and medium term plan: (not necessarily a sequential list of actions)
- Visit/discussion with Plansee (25 Nov 2013) - Define brazing parameters of W shielding on BS - Prototype brazing and validate (LN2 thermal chock) - Launch 1m-long prototype of cold-bore (CB) with 304L SS BS, to study achievable tolerances - Procure P506 SS - Launch 8m-long prototype with CB, real P506 BS - Carry out precise estimate of cryogenic exergy losses, and related modifications (if necessary) to cryo-circuit and loops - Cold-test 8m-long prototype?...
- All this compatibly with… (P. Fessia, RLIUP workshop, Nov 2013)…
12/6/2018
WP3 – Magnets for Insertion Regions

13. With many thanks to: P. Fessia, M
With many thanks to: P. Fessia, M.Buzio: data on W shielding materials, measurement of effect on quadrupole harmonics; L. Dassa, R.F. Gomez: design of BS; R. van Weelderen: cryogenic issues; N. Koos, C. Garion, V. Baglin: various engineering and vacuum issues, such as specifications, structural stresses during quench, vacuum vs BS temperature; Thanks for your attention: any questions?
12/6/2018
WP2 - Task Leaders' Meeting