FUNCTIONAL SPECIFICATION Dorothea Pfeiffer Dennis Haasler GIF++ User Meeting

Content  Functional specifications  GIF++ facility  GIF++ bunker  GIF++ source, irradiator and irradiation zones  GIF++ preparation area  Albedo studies Dorothea Pfeiffer Dennis Haasler

GIF++ Facility PartDetailsDimen sions GIF++ facilityLocated in zone 154 on H4 beam line in EHN1 (building 887) 225 m 2 Preparation area Area for detector preparation directly accessible from control room 83 m 2 Services areaHosts large part of the peripheral infrastructure and services (gas supplies and systems) At least 24 m 2 BunkerContains TBq Cs-137 source (662 keV gammas) 100 m 2 Control roomTwo separate control rooms for services and users in barracks R-B84 and R-A81 with direct access to the preparation area Dorothea Pfeiffer Dennis Haasler

GIF++ Bunker RequirementDetailsImportance Radiological shieldingConcrete walls and roof at least 80 cm thickMandatory Access systemSAS that guarantees “unicité de passage”Mandatory RoofRoof that shields the outside against radiation, and allows ventilation for flow of gas. Possibility to open the roof (opening frequency about once per month). Very important False floorFalse floor made from steel beams and steel plates that reduces the distance between muon beam and floor level by >= 40 cm, offers space for the under floor chamber of the cosmic trigger (shielded by 15 cm of steel, surface level with false floor) and covers the large irradiation zone in the bunker and the preparation zone in front of the large door. Very important Bunker conditionsVentilation system that keeps temperature at °C (stability +/- 1 °C) and humidity between 30 and 50%. After an opening of the roof or the large door, stable conditions should be reached again within 12 hours. The installation of detectors has to be coordinated and optimized to decrease the opening frequency. Very important Space for electronic equipment close to detectors Rack space for RPCs available in the entrance chicane or downstream outside the facility Important Dorothea Pfeiffer Dennis Haasler

GIF++ Bunker Preparation are with false floor Electronics racks Gas racks Large door SAS Cable trays Ventilation Cosmic trigger floor chamber Cosmic trigger roof chamber (has to be rotated 90 ° ) Cosmic trigger fine tracking Beam dump (muon trigger not yet integrated ) Control rooms Rack space False floor Dorothea Pfeiffer Dennis Haasler

GIF++ Irradiator, source and irradiation zones Dorothea Pfeiffer Dennis Haasler RequirementDetailsImportance Tests of very large detectors Very large irradiation zone (4.8 m x 9.2 m). Existence of large bunker door and availability of the overhead crane to move very large detectors into the bunker through the roof. Mandatory Tests with muon beam Muon beam of 100 GeV and 10 4 muons per spill (core beam size 10 cm x 10 cm) can be used for detector tests in the large irradiation zone and the small irradiation zone Mandatory Test of detectors in parallel Enough space to position detectors in front of one another in large irradiation zone. Second smaller irradiation zone (2.2 m x 2.2 m) 180 degrees opposite that can be used in parallel. In total enough space for up to 6 groups to test detectors in parallel. Mandatory Easy installation of detectors Use of CERN made trolleys to move detectors into the bunker. Three cable channels under the false floor in the large irradiation zone. Cable trays, preinstalled common cables and patch panels on both sides of the bunker. Very important Uniform fieldUniform field (fluence of non-scattered gammas) in both irradiation zonesMandatory Attenuated fieldSystem of movable lead attenuators for large irradiation zone that allows attenuation factors between 1 and in several steps Mandatory Lateral irradiator movement System that allows the manual lateral movement of the irradiator and the lead filters towards the muon beam during GIF++ muon beam time. When GIF++ runs with gammas only, the position of the irradiator is such that the source axis is in the middle of the cosmic trigger floor chamber Very important

GIF++ Preparation Area RequirementDetailsImportance Short time storage of detectors Users’ technical coordinator will manage the available spaceVery important Preparatory test of detectors Patch panels and movable racks in preparation areaVery important Storage of tools and small equipment Installation of office cabinetsImportant Dorothea Pfeiffer Dennis Haasler

Scattered gammas at present GIF Dorothea Pfeiffer Dennis Haasler NIM A 452 (2000)

Albedo Studies GIF Dorothea Pfeiffer Dennis Haasler Spectrum in area of 300 cm x 300 cm 155 cm from source (opening angles +/- 37 ° ) source and irradiator (filters still missing) concrete walls and steel floor concrete walls with 5mm lead and steel floor

Albedo Studies GIF Dorothea Pfeiffer Dennis Haasler source and irradiator (filters still missing) concrete walls and steel floor concrete walls with 5mm lead and steel floor Spectrum in area of 300 cm x 300 cm 400 cm from source (opening angles +/- 37 ° )

Albedo Studies GIF Dorothea Pfeiffer Dennis Haasler Distance [cm] Angle [deg] Scattering irradiator (%) Scattering concrete walls (%) Scattering walls with 5mm lead (%) Total scattering (%)