functional specification dorothea pfeiffer dennis haasler gif++ user meeting 14.11.2012
TRANSCRIPT
2
Content
Functional specifications GIF++ facility GIF++ bunker GIF++ source, irradiator and
irradiation zones GIF++ preparation area
Albedo studies
14.11.2012Dorothea Pfeiffer Dennis Haasler
3
GIF++ Facility
14.11.2012
Part Details Dimensions
GIF++ facility
Located in zone 154 on H4 beam line in EHN1 (building 887)
225 m2
Preparation area
Area for detector preparation directly accessible from control room
83 m2
Services area
Hosts large part of the peripheral infrastructure and services (gas supplies and systems)
At least 24 m2
Bunker Contains 16.65 TBq Cs-137 source (662 keV gammas)
100 m2
Control room
Two separate control rooms for services and users in barracks R-B84 and R-A81 with direct access to the preparation areaDorothea
Pfeiffer Dennis Haasler
4
GIF++ Bunker
14.11.2012
Requirement Details Importance
Radiological shielding
Concrete walls and roof at least 80 cm thick Mandatory
Access system SAS that guarantees “unicité de passage” Mandatory
Roof Roof 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 floor False 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 conditions
Ventilation system that keeps temperature at 20-24 °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
ImportantDorothea Pfeiffer Dennis Haasler
5
GIF++ Bunker
14.11.2012
Preparation are with false floor
Electronics racks
Gas racks
Large door
SAS
Cable traysVentilation
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
6
GIF++ Irradiator, source and irradiation zones
14.11.2012Dorothea PfeifferDennis Haasler
Requirement Details Importance
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 104 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 field Uniform field (fluence of non-scattered gammas) in both irradiation zones
Mandatory
Attenuated field
System of movable lead attenuators for large irradiation zone that allows attenuation factors between 1 and 100000 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
7
GIF++ Preparation Area
14.11.2012
Requirement Details Importance
Short time storage of detectors
Users’ technical coordinator will manage the available space
Very important
Preparatory test of detectors
Patch panels and movable racks in preparation area
Very important
Storage of tools and small equipment
Installation of office cabinets Important
Dorothea Pfeiffer Dennis Haasler
8
Scattered gammas at present GIF
14.11.2012Dorothea Pfeiffer Dennis Haasler NIM A 452 (2000) 94-
104
9
Albedo Studies GIF++
14.11.2012Dorothea Pfeiffer Dennis Haasler
Spectrum in area of300 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
10
Albedo Studies GIF++
14.11.2012Dorothea 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 of300 cm x 300 cm 400 cm from source(opening angles+/- 37° )
11
Albedo Studies GIF++
14.11.2012Dorothea Pfeiffer Dennis Haasler
Distance [cm]
Angle [deg]
Scattering irradiator (%)
Scattering concrete walls (%)
Scattering walls with 5mm lead (%)
Total scattering (%)
155 37 13.8 6.6 4.8 25.2
400 37 14.2 12.6 6.1 32.9
155 28 15.5 5.7 4.1 25.3
400 28 15.4 11.6 5 32