GIF++ implementation

Adrian Fabich, Sylvain Girod, EN-MEF-LE

Technical meeting with Supplier of Irradiator, 3rd October 2013

2 A. Fabich, EN-MEF-LE

Contents

Gamma Irradiation Facility GIF++

Layout Technical infrastructure Operation Radiation protection Safety

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The present GIFin the West Area

Present GIF installed in former West Area Since 2004 secondary (muon) beam de-commissioned

Since then only of limited use for physics Limited photon yield (137Cs, 650 GBq installed in `90s) Limited space for increasing number of users

GIF will be decommissioned with the new GIF++ being operational.

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West Area

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H6 beam line

H2 beam line

H4 beam line

H8 beam line

GIF++

GIF++ location in EHN1 (North Area)

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West Area

EHN 1

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https://edms.cern.ch/nav/SMTI137:ST0428786

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GIF++ layout (1)

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dump

secondary beam

PPE (entrance)

MAD

PPG

PPX (only emergency)

dump

gas mixing zone

Preparation zonecable trays to control room

Irradiation area

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GIF++ layout (2)

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secondary beamg-field 2 g-field 1

shielding

preparation zone

gas mixing zone

shielding

shieldingshielding

shielding

shie

ldin

g

±37°±37°

cut view at 2m height

PPE

PPG

PPX

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Large material access

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Irradiation field (1)

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Irradiation field (2)

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Secondary muon beam

From T2 target

99% of beam are within 10 cm x 10 cm, remainder spread over 1 m2

Main user mode: couple of periods per year with each about two weeks duration

Parasitic mode with muons: as much as possible (based on experience from previous years, one can expect parasitic muon beams for about 30-50% of the beam time, equivalent to about 2-4 months/year).

Few periods per year of approximately two weeks duration in which a beam pipe is installed within the facility and electron beam is taken by CMS ECAL downstream from GIF++

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General infrastructure

Electricity: 50 kW light (+emergency) Ethernet cabling, cable trays demineralised water NO cryogenics

Beam equipment Beam instrumentation

Gases Neutral and mixtures (containing flammable gases) 15 gas supplies from the gas hut (build. 909) 10 patch panels in bunker/preparation zone

Each for 4 neutral and 4 hazardous gases

Cooling and ventilation Optional

Supply lines should mainly be installed in the raised floor.

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Measurements: autumn 2012 – spring 2013 (courtesy: R. Guida)

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Sour

ce Ground

- Trigger

Cable Trays

False Floor: permanent supplies

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Dennis Haasler

Same concept in preparation area

• 40 cm free height• Reducing the source height to 2 meter

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15

Personnel and Material Access

PPG, Roof: If opened, patrol lost

PPE & Turnstile: Access rights of people checked, key released and people counted PPE2: Key that was

taken at turnstile has to be used in key access mode (patrol not lost)

MAD: access for material up to PC size

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Personal Protection Exit

Personal Protection Gate

Personal Protection EntryPPE & Turnstile

Pre ZoneSmall material access

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GIF++ control room

HNA 487

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GIF++

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Cables irradiator – using PPE and gallery

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94 m

Irradiator

HNA 487

Cable tray height 2.5 mRoof height 4.8 mUnder floor height 0 m

D. Pfeiffer

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Cable routing – shortest to control room

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ca. 70 m

HNA 487

Cable tray height 2.5 mRoof height 4.8 mUnder floor height 0 m

D. Pfeiffer

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Photon yields to muon detectors

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roof chamber

Average flux 1.0 e5 s^-1 cm^ -2

floor chamberAverage flux 1.2 e3 s^-1 cm^ -2

Downstream beam trigger:average flux 1.8 e4 s^-1 cm^ -2

Upstream beam trigger:average flux 5.9 e4 s^-1 cm^ -2

fine tracker

Average flux 5.1 e5 s^-1 cm^ -2

D. Pfeiffer

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Trapezoid shaped collimator yz

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Point source Cylindrical sourceNo difference between point and cylindrical

source

D. Pfeiffer

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Safety responsibility for implementation

with SBA (together with CERN expert groups) Radiation shielding Flammable gas detection and ODH (in bunker) Fire detection Access system/personnel protection Interlock(s), also with irradiator

Gas zone: ATEX conform (PH)

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GIF++ irradiation zone

The irradiation zone hosting the irradiator is a controlled area (PPE154). inside a supervised area (EHN1).

No risk of activation due to low intensities of secondary beam

Presence of high intensity photon source requires additional precautions due to the prompt radiation levels: Extended shielding Access system Entrance chicanes

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Radiation levels

Keeping lateral exterior limit well below 3 mSv/h At least 80 cm concrete Accordingly adapted chicanes

Roof (no stay area) shielding adjusted for < 15 mSv/h

Final design based on these conceptual shielding studies

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horizontal cut at source height ( 2m)

160 cm

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Radiation shielding

Shielding blocks Double layer closing the block joints

Roof gaps closed with dedicated iron beams Chicanes for entrances

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g-field 2 g-field 1

Vertical cut view

Top cut view

160 cm

max

. 3 m

Sv/h

max. 15 mSv/hm

ax. 3 mSv/h

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Radiation protection

RP monitoring Inside the irradiation area

Monitoring of the source operation Dedicated RP monitoring

2 redundant ionization chambers connected to RAMSES Veto to the source operation

In the surrounding EHN1 area Monitoring by existing beam monitoring (EHN1 standard)

Access system EHN1 standard Access safety elements compliant with SIL3 Single Access System (SAS) for counting persons in the area.

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Operational controls

Users’ interface: CESAR For personnel access and beam control

Standard HW/SW integration into SBA controls environment Access controls Beam controls Safety elements

Irradiator provided with its own console. Only link to SBA controls via veto line and status logging.

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Safety conditions foractive irradiator

Exclude direct exposure to g-source

Source out of parking position only possible if GIF++ access chain is CLOSED AND (protecting in upstream zone)

Upstream beam dump is IN-BEAM OR PPE144 is CLOSED (no access)

AND (protecting in downstream zone) Downstream beam dump is IN-BEAM OR PPE164 is CLOSED (no access)

AND (no alarms) No fire No power failure No emergency stop button

Irradiator controls included in industrial delivery. Veto from CERN safety chain will force source into parking position.

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upstreamdump

downstreamdump

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Conclusions

3D model of GIFF++ is available

Require design documents of irradiator+filter system Approved status CERN will study the mechanical integration

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