LIU external beam dump review External beam dump option A: branching off from LSS6 J.L. Abelleira Thanks to: F. Velotti, B. Goddard, M. Meddahi, H. Vincke, R. Fernández Ortega, B. Blanco, L. Faisandel, A. Fabich, K. Cornelis 30 th July 2014

Branching off from LSS6 This talk summarizes the different possibilities to install a beam dump using the LSS6 extraction system and profiting from the existing tunnels Summary: Locations for the dump tunnel Magnets and optics HiRadMat: operational issues External beam dump option A: branching off from LSS62 TT61 TNC

Dump locations Different locations have been explored: TT61 and TNC External beam dump option A: branching off from LSS63 Fast extraction LSS6 Beam

TT61: Magnets External beam dump option A: branching off from LSS64 2xMBB 4xMBS 2xMBB 4xMBS In place of TT61HiRadMat 4xMBSOffOn 4xMBSOnOff 2xMBB 2xMBE (-) 2xMBB(+) TT66.MBB TT66.MBB

TT61: vertical bending External beam dump option A: branching off from LSS65 There are three options for the vertical plane: 1.Use existing TT61 till the end (with its slope) 2.Excavate new tunnel under TT61 to bend the beam to the horizontal 3.Bend the beam with an intermediate angle ϴ  40 mrad ϴ  80 mrad ϴ0ϴ0 0<ϴ<80 mrad Beam

TT61: Option 1. vertical bending SPS external dump study6 6 MBE will bend the beam by 40 mrad, required to follow the tunnel No need for civil engineering. The tunnel has an inclination which leads to the surface. 6xMBE  100 m Option 1 consists in using the existing TT61 tunnel. Beam

TT61: Option 1. lateral shielding SPS external dump study7  100 m Do we have enough shielding to HiRadMat? Beam 3-meter separation*: enough to avoid activation but masks HiRadMat operation 3 m 8-meter separation*: needed to not radiate HiRadMat H. Vincke End HiRadMat Position of the dump to not radiate HiRadMat

TT61: Option 1. surface shielding 8SPS external dump study  600 m

TT61: Option 1 9SPS external dump study One could think of such a shielding….  600 m The shielding will provide a muon dose < 10  S/year on the surface*: ~ 4000 m 3 of concrete to cost ~1.8M € Blockage of the line + *See H. Vincke’s talk

TT61: Option 2 SPS external dump study10 >140 m 3.4 m We could also bend horizontally and use the soil (molasse) as shielding

TT61: Option 2 SPS external dump study 11 Option 2 consists on excavating the tunnel to send the beam horizontally. It requires a big effort in terms of civil engineering Same vertical magnets as in option 1, but with opposite polarity 3 m As in option 1, we could extend the line

TT61: Option 3 SPS external dump study12 Angle [degrees]Angle [mrad]Distance [m] Bending with 0<ϴ<80 mrad and use the ground as shielding B. Blanco, R. Fernandez (GS/SE) More than 500 m, less than 10  Sv year

TT61: Option 3 SPS external dump study13 From H. Vincke’s talk Muon dose for 2E18 protons being sent on a Carbon/Iron dump being followed by concrete* to stop all muons *Assume the same shielding for molasse

TT61: Option 3 14SPS external dump study Option 3 can help alleviate the tight constraints on the civil engineering for a safely radiation to the surface. In order to define the angle, we have to find a compromise between magnet cost, civil engineering cost and radiation. We have already a relation between the angle and the length of natural shielding. It looks like the most promising option for a dump in TT61. Is it feasible to excavate the tunnel?

TNC External beam dump option A: branching off from LSS615 Beam dump Beam direction ~170 m

TNC: dump location External beam dump option A: branching off from LSS6 Potential location of the dump dump Soil water activation? A Fabich 16

TNC. Dump beam line External beam dump option A: branching off from LSS T Only a set of elements added: Beam direction

TNC External beam dump option A: branching off from LSS618 Beam direction Actual HiRadMat dump will need to be moved.

TNC: Optics, beam sizes and dump External beam dump option A: branching off from LSS619 LIUHL-LHC N2.00x x10 11 ε N [  m] nbnb 288 σσ 3x10 -4 HL-LHCLIU Particles in dump 5-sigma beam sizes Beam diverges: no need for additional quadrupoles

TNC: operational aspects External beam dump option A: branching off from LSS620 The TNC-option is the most interesting one in terms of civil engineering costs, but the impact on HiRadMat operation shall be included in the considerations. A typical HRM experiment takes place once a month. Roughly 3 accesses are needed: The conditions of HiRadMat access are detailed in EDMS (link), which also indicates the times required for activation cool down of air and the following flush ventilation.link accessTime [h] Installation Experiment Post-experiment Note: cool down before access A. Fabich

TNC: Integration implications: External beam dump option A: branching off from LSS621 Detailed integration studies to be performed. At first: Without a modification of the present HRM line there is almost no space available for installation of the beam dump line Modifying the HRM beam line. Need to displace all the beam line, including a major intervention of the existing dump. - Element highly activated -If moved to the right, the access/service corridor is narrowed These integration works need a detailed technical study A. Fabich

TNC: RP implications External beam dump option A: branching off from LSS622 Possible issues: Water activation. Access in TT61 If we need to locate the beam dump in the center of the cavern, additional beam elements will be needed and will imply additional complications with the integration with HIRADMAT. An upgrade of the present ventilation system may be necessary A. Fabich, H. Vincke

Summary of all the options External beam dump option A: branching off from LSS623 Pros.Cons. TT61 Option1 no civil engineering works needed for the horizontal bending: 8xMBS+4xMBB Access not allowed in neighbouring areas Shielding required: complete block of existing line Option2 Horizontal radiation. Less problematic than option 3 Civil engineering works Partial block of TT61 Radiation to be evaluated Option3 Less vertical bending magnets Less civil engineering works than option 2 TNC No civil work only 3xMBS needed HiRadMat: integration and operation For all the options considered: Interlock system issues (same as in LSS4-option) HiRadMat access in case of beam loss

Preliminary cost estimation External beam dump option A: branching off from LSS624 No cost estimation for the civil works We have spare MBE, QTL Need for the switches (MBS) - TT61: ~1.44 MCHF* - TNC: ~0.64 MCHF * (including power converters) TED-like block: 0.5MCHF Shielding block: 13k€ Vacuum systems to be checked See F. Velotti’s talk *400kCHF per power converter 80kCHF per MBS unit

Conclusions The most feasible option is TNC, but it is not compatible with HiRadMat operation. TT61 option 3 is the most promising option compatible with HiRadMat operation, but the difficulty of the civil works is even harder than in LSS4 External beam dump option A: branching off from LSS625

Thank you… External beam dump option A: branching off from LSS626 …For your attention

backup External beam dump option A: branching off from LSS627 GISTT61 TT66.QTLD QTLD (no name)BPCK TT66.MBB MBS (off) TT66.MBB MBS (off) MBS (off) MBS (off) MBS (-) MBS (-) MBS (-) MBS (-) MBB (-) MBB (-) MBE (-) VERTICAL MBE (-) VERTICAL MBB (+) MBB (+)

backup External beam dump option A: branching off from LSS628 F. Velotti estimation of the expected protons per year to be dumped in the SPS, after LS2 backup

External beam dump option A: branching off from LSS629