rp-recap of the residual dose rates in the hl-lhc …...2020/02/21  · lss 1 vs lss 5 (optics v1.3)...

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5A. Infantino

HSE-RP-AS

EDMS 2331769

Aim

To provide an overview/recap of the residual dose rates in LSS1 and LSS 5 in the HL-LHC era

Data based on existing C. Adorisio’s FLUKA simulations (EDMS 1868872): simulations refers to optics v1.3 → some differences with respect v1.5 (e.g. crossing planes, collimators settings, …).

This ppt: focus to the area between TAXN-D2 (± ~10m)

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

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4

Reminder: ALARA at CERNEDMS 1751123

‘hard’ limits used to determine the minimum ALARA Level

base of a radiological risk assessment

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

Operation Scenario

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

5

HL-LHC Residual dose rate estimation

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

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Working distance

=

40 cm

(from outer surface)

TAXN-D2 Residual Dose rates (IR1 - v1.3)

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

7

Dedicated up-to-date (v1.5)

TAXN RP-evaluation for WP8 in

A. Infantino’s EDMS 2256546.

Missing Crab cavities!

Reference cooling times for:

1 week → short accesses/TS

4 weeks → YETS

4 months → LS

TAXN-D2 Residual Dose rates (IR5 - v1.3)

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

8

LSS 1 Vs LSS 5 (optics v1.3)

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

9

Summary

Within the TAXN-D2 region, the area downstream D2 (non-IP side) shows the lowest radiation levels

Although simulations refer to optics v1.3, general outcome should be valid for v1.5 → locally, absolute values might be different.

Useful References:

C. Adorisio, HL-LHC - Residual Dose Rate Estimations in the LSS1 and LSS5 (from TAXS up to Q7) - EDMS 1868872 (link)

A. Infantino, HL-LHC TAXN: RP considerations on shielding requirements - EDMS 2256546 (link)

A. Infantino (HSE-RP)

RP-recap of the residual dose rates in the HL-LHC LSS 1 and 5

21.02.2020 – EDMS 2331769

10

ANGELO INFANTINOCERN HSE-RP-AS

angelo.infantino@cern.ch