Highlights of RP activities in support of ISOLDE operation and projects
Joachim Vollaire, Alexandre Dorsivaland 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
Outline Support to activities during the winter
shutdown Radiation measurement campaign (shielding
assessment) Studies for the robots (target handling)
replacement project Conclusions
07-DEC-20113 ISOLDE Workshop and Users meeting 2011
Shutdown : Transport of used targets
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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
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Replacement of GPS FE (HRS done in 2010) Very complex interventions involving several groups Collective dose: 7.6 man.mSv
07-DEC-2011ISOLDE Workshop and Users meeting 2011
Front End maintenance
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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
07-DEC-2011ISOLDE Workshop and Users meeting 2011
Outline Support to activities during the winter
shutdown Radiation measurement campaign (shielding
assessment) Studies for the robots (target handling)
replacement project Conclusions
07-DEC-20117 ISOLDE Workshop and Users meeting 2011
Shielding efficiency assessment
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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 !
07-DEC-2011ISOLDE Workshop and Users meeting 2011
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
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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
07-DEC-2011ISOLDE Workshop and Users meeting 2011
Results summary
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HD target
07-DEC-2011ISOLDE Workshop and Users meeting 2011
FLUKA studies (Y. Romanets – ITN Lisbon)
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Comparison measurements calculations
Study of energy increase effect and improvement of the shielding
07-DEC-2011ISOLDE Workshop and Users meeting 2011
Outline Support to activities during the winter
shutdown Radiation measurement campaign (shielding
assessment) Studies for the robots (target handling)
replacement project Conclusions
07-DEC-201113 ISOLDE Workshop and Users meeting 2011
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
07-DEC-2011ISOLDE Workshop and Users meeting 2011
FLUKA studies : Example UCx on HRS
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Dose rate calculations for recovery scenario Several Sv/h on contact with the target (after 72 h of decay)
07-DEC-2011ISOLDE Workshop and Users meeting 2011
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
07-DEC-2011ISOLDE Workshop and Users meeting 2011
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
Outline Support to activities during the winter
shutdown Radiation measurement campaign (shielding
assessment) Studies for the robots (target handling)
replacement project Conclusions
07-DEC-201118 ISOLDE 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 ?
07-DEC-2011ISOLDE Workshop and Users meeting 2011
Your are at home in ISOLDE !
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SORT YOUR WASTE AND ADOPT GOOD HOUSEKEEPING PRACTICE !!!
07-DEC-2011ISOLDE Workshop and Users meeting 2011
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 !
07-DEC-2011ISOLDE Workshop and Users meeting 2011