Highlights of RP activities in support of ISOLDE operation and projects Joachim Vollaire, Alexandre...

Highlights of RP activities in support of ISOLDE operation and projects

Joachim Vollaire, Alexandre Dorsival

and Christelle Saury with material from others

Outline Support to activities during the winter

shutdown Radiation measurement campaign (shielding

assessment) Studies for the robots (target handling)

replacement project Conclusions

07-DEC-20112 ISOLDE Workshop and Users meeting 2011

Shutdown : Transport of used targets

4

From ISOLDE target area to storage area at CERN

First intervention in the target area (to reduce the dose rate) Use of “Type A” container for the transport of 24 targets Average dose rate : 2.18 mSv/h @ 40 cm and 8.1 mSv/h max. Collective dose of 982 man.mSv for the whole operation Lessons learnt will be used for transport in 2012

07-DEC-2011ISOLDE Workshop and Users meeting 2011

Replacement of GPS FE#4 by FE#7

5

Replacement of GPS FE (HRS done in 2010) Very complex interventions involving several groups Collective dose: 7.6 man.mSv


Front End maintenance

6

Example : Replacement of extraction electrode

Permanent improvement of processes following RP recommendations

Example: development of new tool for extraction electrode replacement

HRS FE#6 maintenance in 2011 : 3.7 man.mSv 1 Sv/h on contact

(with b emitters)+ very high contamination


Shielding efficiency assessment

8

Motivations: Linac4 injector for the PS Booster PS Booster energy from 1.4 GeV to 2

GeV HIE-ISOLDE project

Can ISOLDE “digest” the energy and intensity increase ?

Extensive radiation measurement campaign performed in 2010-2011

Shielding performances is one of many RP aspects to address !


Original beam parameters for design…

9 07-DEC-2011ISOLDE Workshop and Users meeting 2011

Design: 2.2 mA @ 1.0 GeV = 2.2 kW Today : 2 mA @ 1.4 GeV = 2.8 kWFuture: 4 mA @ 2.0 GeV = 8.0 kW ?

Measurement and shielding assessment

10

Measurements in accessible areas outside and inside the hall

Normalization of measured dose rate to the beam intensity

Use of 3D models to reconstruct shielding material thickness

Measurementlocation

Beam dump

HRS


Results summary

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HD target


FLUKA studies (Y. Romanets – ITN Lisbon)

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Comparison measurements calculations

Study of energy increase effect and improvement of the shielding


FLUKA study for the new robots project

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Current robots used for the target replacement arriving at the end of their lifetime

New concept considered (AGV) FLUKA calculations needed to assess

the robot exposure to radiations Two concepts have pros / cons


FLUKA studies : Example UCx on HRS

15

Dose rate calculations for recovery scenario Several Sv/h on contact with the target (after 72 h of decay)


Close view of the residual dose rate

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High reliability or remote recovery needed as significant cooling time required before any human intervention


Robot exposure in parking position

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Damage to electronic components in parking position (“currency” is the 1MeV neutron equivalent)

Damage to organic component Relocate sensitive electronic

outside07-DEC-2011ISOLDE Workshop and Users meeting 2011

Conclusions

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Very busy year to support operation (FE exchange)

Shielding assessment (thanks to extra RP resources available since 2 years) Baseline for shielding improvement studies Update of some areas classification

Robot reliability critical considering the future intensity and energy upgrade (several issues with current system this year) for the availability of the facility

Many challenges ahead of us (HIE-ISOLDE) How can you help us ?


Your are at home in ISOLDE !

20

SORT YOUR WASTE AND ADOPT GOOD HOUSEKEEPING PRACTICE !!!


Your are at home in ISOLDE !

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SORT YOUR WASTE AND ADOPT GOOD HOUSEKEEPING PRACTICE !!!

IN CASE OF QUESTION:CALL THE A-TEAM !


Highlights of RP activities in support of ISOLDE operation and projects Joachim Vollaire, Alexandre...

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