Marcus M. Morgenstern DGS-RP-AS LIU-PSB meeting - June 18 th , 2015 - - PowerPoint PPT Presentation

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Marcus M. Morgenstern DGS-RP-AS LIU-PSB meeting - June 18 th , 2015 - - PowerPoint PPT Presentation

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Marcus M. Morgenstern DGS-RP-AS LIU-PSB meeting - June 18 th , 2015 - Introduction Updated study previously performed by J. Blaha (2013) Updates include: Dump geometry Shielding geometry Aim: Study radiological

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SLIDE 1

Marcus M. Morgenstern DGS-RP-AS LIU-PSB meeting

  • June 18th, 2015 -
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SLIDE 2

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 2

Introduction

  • Updated study previously performed by J. Blaha

(2013)

  • Updates include:
  • Dump geometry
  • Shielding geometry
  • Aim:
  • Study radiological assessment for HSTS to fulfil safety

requirements

  • Preliminary prompt and residual dose rate maps for updated

shielding – done

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SLIDE 3

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 3

Schedule of L4 commissioning

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SLIDE 4

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 4

Linac4 accelerator – commissioning phase

Installation of HSTS

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SLIDE 5

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 5

Outline of HSTS

Linac2

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SLIDE 6

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 6

The Linac2 / Linac4 interface

  • Linac2 Classification:
  • interlocked primary beam area (no access during operation)
  • Limited Stay Area due to residual dose rate levels (access during TS,

YETS….)

  • Building 363 (Linac2 racks, amplifiers, Linac2 control room….) is classified

as a Simple Controlled Radiation Area 363

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SLIDE 7

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 7

Prompt dose rate from Linac4

  • peration (Previous study)

Exclusion area

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SLIDE 8

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 8

Exclusion area…..

Fences have been installed

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SLIDE 9

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 9

Radiation monitoring

  • RAMSES monitor + ARCON monitor

available

  • Radiation alarm level (10 / 20 µSv/h low/

high) on RAMSES

  • Typical dose rates during Linac2 operation

5 – 10 µSv (PAXLN202)

  • Idea: move one of the monitors to L4

tunnel

Linac 2

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SLIDE 10

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 10

Transition Linac4 -100 MeV to 160 MeV + HST

  • Beam dump setup used for 100 MeV

commissioning partially (shielding) re-used for the HST in the transfer line

  • Core has to be replaced as the core used at

100 MeV cannot sustain the 160 MeV (operation done in 867)

  • Work and Dose planning to be done…
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SLIDE 11

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 11

Geometry updates I - shielding

  • Downstream concrete

shielding extended from 80 cm to 1.2 m in thickness

  • Lateral iron shielding doubled

in thickness, i.e. 40 cm compared to 20 cm before

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SLIDE 12

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 12

Geometry updates II - dump

  • Dimensions taken from 2D

drawings and 3D Inspector model

  • Material composition still to be

confirmed

Thanks to Filippo Stefanini

FLUKA model

Downstream shielding Trolley Concrete shielding SSS shielding

Core/Jacket/Cooling

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SLIDE 13

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 13

FLUKA Simulation setup

  • Split beam according to 5% on internal

dump; 95% (= stripping foil efficiency) on main dump

  • Simulation results are merged

Used for prompt dose rate calculation Maximum dose rate during day time

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SLIDE 14

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 14

Prompt dose rate

Z [cm]

10500 − 10000 − 9500 − 9000 − 8500 −

Y [cm]

4000 4500 5000 5500 6000 6500

Sv/h] µ Prompt dose rate [

2 −

10

1 −

10 1 10

2

10

3

10

4

10

5

10

6

10

7

10

8

10

Z [cm]

10500 − 10000 − 9500 − 9000 − 8500 −

Y [cm]

4000 4500 5000 5500 6000 6500

Sv/h] µ Prompt dose rate [

2 −

10

1 −

10 1 10

2

10

3

10

4

10

5

10

6

10

7

10

8

10

Z [cm]

10400 − 10200 − 10000 − 9800 − 9600 − 9400 − 9200 − 9000 −

Y [cm]

2500 3000 3500 4000 4500 5000

Sv/h] µ Prompt dose rate [

2 −

10

1 −

10 1 10

2

10

3

10

4

10

5

10

6

10

7

10

8

10

Linac4 tunnel Linac4/Linac2 junction

@Linac2 amplifier gallery @Linac2 level

  • Linac2 tunnel

accessible during Linac4 operation

  • Downstream

shielding sufficiently reduces dose from main dump, but doesn’t cover internal dump

  • Prompt dose rate

seems similar to previous study, though detailed evaluation of profiles necessary to provide final answer of classification

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SLIDE 15

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 15

Z [cm]

10400 − 10200 − 10000 − 9800 − 9600 − 9400 − 9200 −

Y [cm]

2600 2800 3000 3200 3400 3600 3800 4000

Sv/h] µ Residual dose rate [

5 − 10 4 − 10 3 − 10 2 − 10 1 − 10 1 10 2 10 3 10 4 10

1m cooling time

Z [cm]

10400 − 10200 − 10000 − 9800 − 9600 − 9400 − 9200 −

Y [cm]

2600 2800 3000 3200 3400 3600 3800 4000

Sv/h] µ Residual dose rate [

5 − 10 4 − 10 3 − 10 2 − 10 1 − 10 1 10 2 10 3 10 4 10

1d cooling time

Residual dose rate map

Z [cm]

10400 − 10200 − 10000 − 9800 − 9600 − 9400 − 9200 −

Y [cm]

2600 2800 3000 3200 3400 3600 3800 4000

Sv/h] µ Residual dose rate [

5 − 10 4 − 10 3 − 10 2 − 10 1 − 10 1 10 2 10 3 10 4 10

1h cooling time

Z [cm]

10400 − 10200 − 10000 − 9800 − 9600 − 9400 − 9200 −

Y [cm]

2600 2800 3000 3200 3400 3600 3800 4000

Sv/h] µ Residual dose rate [

5 − 10 4 − 10 3 − 10 2 − 10 1 − 10 1 10 2 10 3 10 4 10

6m cooling time

Z [cm]

10400 − 10200 − 10000 − 9800 − 9600 − 9400 − 9200 −

Y [cm]

2600 2800 3000 3200 3400 3600 3800 4000

Sv/h] µ Residual dose rate [

5 − 10 4 − 10 3 − 10 2 − 10 1 − 10 1 10 2 10 3 10 4 10

1w cooling time

Z [cm]

10400 − 10200 − 10000 − 9800 − 9600 − 9400 − 9200 −

Y [cm]

2600 2800 3000 3200 3400 3600 3800 4000

Sv/h] µ Residual dose rate [

5 − 10 4 − 10 3 − 10 2 − 10 1 − 10 1 10 2 10 3 10 4 10

8h cooling time

  • Apparently, the

most activated components are the beam dumps

  • After ~1 week of

cooling time the residual dose drops below 1 µSv/h

  • Though profiles

needed for exact numbers

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SLIDE 16

Radiological study for HSTS @ L4 – M. M. Morgenstern DGS-RP - 2015-06-18 16

Conclusion/Outlook

  • Dose rates similar to previous study, though further investigation (e.g.

profiles) are required to get final conclusion on impact of updated shielding

  • Update/cross check activation of components
  • Check necessity for material updates in geometry (~1-2 weeks)
  • Steel components (SSS vs. SS316LN …)
  • Iron shielding (“normal” iron vs. cast iron)
  • Decommissioning studies ongoing (~1 week)
  • Simulation already done, though lacking analysis of results
  • Perform calculation whether beam power can be increased for

updated shielding (~1-2 weeks)

  • Study runs in parallel to 160 MeV commissioning run study for main

beam dump

  • Documentation in progress
  • Assuming missing information can be gathered soon and everything

runs smoothly, final results are expected in a few weeks time scale