LIU external beam dump review External beam dump option A: branching off from LSS6 J.L. Abelleira...
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Transcript of LIU external beam dump review External beam dump option A: branching off from LSS6 J.L. Abelleira...
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
30th July 2014
External beam dump option A: branching off from LSS6 2
Branching off from LSS6This talk summarizes the different possibilities to install a beam dump using the LSS6 extraction system and profiting from the existing tunnelsSummary:• Locations for the dump tunnel• Magnets and optics• HiRadMat: operational issues
TT61
TNC
External beam dump option A: branching off from LSS6 3
Dump locations• Different locations have been explored: TT61 and TNC
Fast extraction LSS6
Beam
External beam dump option A: branching off from LSS6 4
TT61: Magnets
2xMBB2xMBB
4xMBS
2xMBB
4xMBS
In place of TT61 HiRadMat
4xMBS Off On4xMBS On Off2xMBB
2xMBE (-)2xMBB(+)
TT66.MBB.660205TT66.MBB.660213
External beam dump option A: branching off from LSS6 5
TT61: vertical bending
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
ϴ80 mrad
ϴ0
0<ϴ<80 mrad
Beam
6
TT61: Option 1. vertical bending
SPS external dump study
• 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
Beam
7
TT61: Option 1. lateral shielding
SPS external dump study
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
SPS external dump study 8
TT61: Option 1. surface shielding
600 m
SPS external dump study 9
TT61: Option 1
One could think of such a shielding….
600 m
The shielding will provide a muon dose < 10 S/year on the surface*:
~ 4000 m3 of concrete to cost ~1.8M €
Blockage of the line
+
*See H. Vincke’s talk
SPS external dump study 10
TT61: Option 2
>140 m
3.4 m
We could also bend horizontally and use the soil (molasse) as shielding
SPS external dump study
TT61: Option 2
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
SPS external dump study 12
TT61: Option 3
Angle [degrees] Angle [mrad] Distance [m]
0.46 8.0 28160.55 9.6 21551.33 23.2 13202.36 41.2 8404.70 82.0 5920.50 8.7 28061.0 17.4 16641.5 26.2 11692.0 34.9 9302.5 43.6 8153.0 52.4 7443.5 61.1 580
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
SPS external dump study 13
TT61: Option 3
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
SPS external dump study 14
TT61: Option 3
• 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?
External beam dump option A: branching off from LSS6 15
TNC
Beam dump
Beam direction
~170 m
External beam dump option A: branching off from LSS6 16
TNC: dump location
Potential location of the dump
dump
Soil water activation?
A Fabich
External beam dump option A: branching off from LSS6 17
TNC. Dump beam line
3xMBS @ 1.23 T
Only a set of elements added:
Beam direction
External beam dump option A: branching off from LSS6 18
TNCBeam
direction
Actual HiRadMat dump will need to be moved.
External beam dump option A: branching off from LSS6 19
TNC: Optics, beam sizes and dumpLIU HL-LHC
N 2.00x1011 2.32x1011
εN[m] 1.33 2.08nb 288σ 3x10-4
HL-LHCLIUParticles in dump
5-sigma beam sizes
𝐴𝑥 ,𝑦=𝑛𝑠𝑖𝑔 ∙√𝛽𝑥, 𝑦 ∙𝜖𝑁 ;𝑥 ,𝑦
γ 𝑟 β𝑟+ ¿¿¿
Beam diverges: no need for additional quadrupoles
External beam dump option A: branching off from LSS6 20
TNC: operational aspects
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-1155061 (link), which also indicates the times required for activation cool down of air and the following flush ventilation.
access Time [h]Installation 1
23
666
Experiment 12
22
Post-experiment 12
66
Note: cool down before access
A. Fabich
External beam dump option A: branching off from LSS6 21
TNC: Integration implications:
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
External beam dump option A: branching off from LSS6 22
TNC: RP implications
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
External beam dump option A: branching off from LSS6 23
Summary of all the options
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
evaluatedOption3 • 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
External beam dump option A: branching off from LSS6 24
Preliminary cost estimation
• 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
External beam dump option A: branching off from LSS6 25
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 LSS6 26
Thank you…
…For your attention
External beam dump option A: branching off from LSS6 27
backupGIS TT61
TT66.QTLD.660200 QTLD.610200(no name) BPCK.610202
TT66.MBB.660205 MBS.610204 (off)TT66.MBB. 660213 MBS.610209 (off)
MBS.610214 (off) MBS.610219 (off) MBS.610230 (-) MBS.610235 (-) MBS.610240 (-) MBS.610245 (-) MBB.610250 (-) MBB.610455 (-) MBE.610350 (-) VERTICAL MBE.610360 (-) VERTICAL MBB.610335(+) MBB.610340(+)
External beam dump option A: branching off from LSS6 28
backup
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 LSS6 29
backup