DOSE TO WARM MAGNETS

E. Skordis & F. Ceruttiloss input by: E. Quaranta, R. Bruce and S. Redaelli

Protection screen design with: P. Fessia , L. Favre, P. A. Thonet

2/9/2013 Collimation Working Group E. Skordis 1

IR3:THE TCAPD ROLE

(@7 TeV)

2/9/2013 Collimation Working Group E. Skordis 2

IR3 Geometry and Sixtrack Lossmap profile

Beam 1

MBW.C6L3

TCAPA.6L3

MQWA.CE5L3MQWA.E5L3

TCAPD.6L3

MBW.B6L3 MBW.A6L3

TCSG.5L3TCP.6L3

Z (m)

Coun

ts Average interaction depth: 47 μm

Average interaction longitudinal position: 14.9 cm

All particles are impacting the inner jaw.

2/9/2013 Collimation Working Group E. Skordis 3

MBW Peak Dose profile [I]

Beam 1

MBW.C6L3

TCAPA.6L3

MQWA.CE5L3MQWA.E5L3

MBW.C6L3

MBW.B6L3

TCAPD.6L3

MBW.B6L3 MBW.A6L3

TCSG.5L3

Beam 1 Beam 1

obviously the TCAPD plays no role

MBW.A6L3

TCP.6L3

2/9/2013 Collimation Working Group E. Skordis 4

MBW.C6L3

Beam 1

MBW.C6L3

TCAPA.6L3

MQWA.CE5L3MQWA.E5L3

MBW.B6R7

TCAPD.6L3

MBW.B6L3 MBW.A6L3

TCSG.5L3

Beam 1

Beam 2 @ 6.5 TeV

MBW Peak Dose profile [II]

(per proton lost)2/9/2013 Collimation Working Group E. Skordis 5

MQWA.E5L3 Peak Dose profile

Beam 1

the TCAPD halves the dose

2/9/2013 Collimation Working Group E. Skordis 6

MQWA.E5L3 Peak Dose profile

Beam 1

MQWA.E5R7

Beam 2 @ 6.5 TeV

(per proton lost)

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MQWA.D5L3 Peak Dose profile

Beam 1

2/9/2013 Collimation Working Group E. Skordis 8

MQWA.C5L3 Peak Dose profile

Beam 1

the most impacted one!following the TCSG

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MQWA.5L3 Peak Dose profile

Beam 1

2/9/2013 Collimation Working Group E. Skordis 10

MQWA.B5L3 Peak Dose profile

Beam 1

2/9/2013 Collimation Working Group E. Skordis 11

MQWA.A5L3 Peak Dose profile

Beam 1

2/9/2013 Collimation Working Group E. Skordis 12

MQWA.E4L3 Peak Dose profile

Beam 1

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Conclusions

• The TCAPD halves the peak dose in the MQW directly protected (MQWA.E5L3)

• However for the most impacted one (MQWA.C5L3), following the TCSG, the reduction is limited to ~ 30%

• The effectiveness of a dedicated shielding, to be embedded in the magnet, is under study (See next part)

2/9/2013 Collimation Working Group E. Skordis 14

IR7:Possible protection screen effect

(@6.5 TeV)

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MBWA - MBWB Peak Dose profileBeam 2

MBW.BMBW.A

TCAP

MQWA.E5R7MQWA.D5R7

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MBWA - MBWB Peak Dose profile

MBW.A6R7 MBW.B6R7

Beam 2Beam 2

Normalization: 1.15 1016 p (50 fb-1 )

MBW.A6R7 with Flanges

Beam 2

MBW.B6R7With Flanges

Beam 2

2/9/2013 Collimation Working Group E. Skordis 17

MBWA - MBWB Peak Dose profile

MBW.A6R7Flanges +

Protection

MBW.B6R7 Flanges +

Protection

Beam 2Beam 2

MBW.A6R7 with Flanges

Beam 2

MBW.B6R7With Flanges

Beam 2

2/9/2013 Collimation Working Group E. Skordis 18Normalization: 1.15 1016 p (50 fb-1 )

MBWB Dose 2d cross section at maximum No protection

Dose (MGy)

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MBWB Dose 2d cross section at maximum With protection

Dose (MGy)

2/9/2013 Collimation Working Group E. Skordis 20Normalization: 1.15 1016 p (50 fb-1 )

MQWA.E5R7 Peak Dose Profile

Beam 2Beam 2

Old ModelWith Flanges

2/9/2013 Collimation Working Group E. Skordis 21Normalization: 1.15 1016 p (50 fb-1 )

MQWA.E5R7 Peak Dose Profile

Beam 2

2/9/2013 Collimation Working Group E. Skordis 22Normalization: 1.15 1016 p (50 fb-1 )

MQWA.D5R7 Peak Dose Profile

Beam 2

2/9/2013 Collimation Working Group E. Skordis 23Normalization: 1.15 1016 p (50 fb-1 )

MQWA.C5R7 Peak Dose Profile

Beam 2

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MQWA. 5R7 Peak Dose Profile

Beam 2

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MQWA.B5R7 Peak Dose Profile

Beam 2

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MQWA.A5R7 Peak Dose Profile

Beam 2

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MQWA.E4R7 Peak Dose Profile

Beam 2

2/9/2013 Collimation Working Group E. Skordis 28Normalization: 1.15 1016 p (50 fb-1 )No protection was added to this model

Protection Is needed due to comparable Peak dose with MQWA.E5R7

MQWA.E5R7 Dose 2d cross section

2/9/2013 Collimation Working Group E. Skordis 29

MQWA.E5R7 Dose 2d cross section

2/9/2013 Collimation Working Group E. Skordis 30

MQWA.E5R7 Dose 2d cross section

2/9/2013 Collimation Working Group E. Skordis 31

5770

5670 2310

1780

1670

50

70

2030 2130

22301950

50 110

500 110

1250720

370

210

290

570

4550 640

1290

Values are in pJoule/proton lost in the collimators

MQWA.E Energy Deposition on varius elements

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60

2020

90

With Protection

Temperature Increase in protective Elements

2/9/2013 Collimation Working Group E. Skordis 33

MBW MQW-front MQW-mid MQW-Top/Bot

( GeV/p)1.6 5.9 4.7 2.8

(Kg)3.2 12.8 8.7 14

Temp Increase (°/s)0.055 0.050 0.059 0.022

0.91011 𝑝𝑠 (𝐵𝑒𝑎𝑚𝑙𝑖𝑓𝑒𝑡𝑖𝑚𝑒𝑜𝑓 1h )

𝑎=¿𝐺𝑒𝑉𝑝 𝑑𝑒𝑝𝑜𝑠𝑖𝑡𝑒𝑑𝑖𝑛 h𝑡 𝑒𝑒𝑙𝑒𝑚𝑒𝑛𝑡 𝑖𝑛𝑠𝑡𝑢𝑑𝑦

𝑏=𝑚𝑎𝑠𝑠𝑜𝑓 𝑒𝑙𝑒𝑚𝑒𝑛𝑡𝑖𝑛 𝑠𝑡𝑢𝑑𝑦

Conclusions

• The protection screen for the MBWs provides a peak reduction of a factor of 3

• For the MQWs the effect is again a reduction of a factor of 3, however, increasing the radius of the front cylindrical screen and increasing the length of the inner protection could improve performance

• Design to be finalised (Cabling)

2/9/2013 Collimation Working Group E. Skordis 34