Mechanics and Cooling Systems for the CBM STS
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Mechanics and Cooling Systems for the CBM STS SAINT-PETERSBURG STATE UNIVERSITY S.Igolkin , e-mail Igolkin @hiex.phys.spbu.ru [email protected] CONTENT 1. Si detector’s plates 2. Module of detector 3. Carbon fiber frame 4. Detector’s plates holder 5. Ladder support system 6. The parts of cooling system 7. Arrangement of detectors plates on a ladder 8. Typical construction of the ladder 9. Construction of STS station Nr 4 10. Tilling and distances between sensors 11. Ladders installation and fixation Dubna , Russia October, 2008
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Mechanics and Cooling Systems for the CBM STS. CONTENT Si detector’s plates Module of detector Carbon fiber frame Detector’s plates holder 5. Ladder support system 6. The parts of cooling system 7. Arrangement of detectors plates on a ladder - PowerPoint PPT Presentation
Transcript of Mechanics and Cooling Systems for the CBM STS
Mechanics and Cooling Systems for the CBM STS
SAINT-PETERSBURG STATE UNIVERSITYS.Igolkin , e-mail Igolkin @hiex.phys.spbu.ru [email protected]
CONTENT 1. Si detector’s plates2. Module of detector3. Carbon fiber frame4. Detector’s plates holder 5. Ladder support system6. The parts of cooling system 7. Arrangement of detectors plates on a ladder8. Typical construction of the ladder9. Construction of STS station Nr 410. Tilling and distances between sensors11. Ladders installation and fixation
Dubna , Russia October, 2008
Installation of Si detectors is offered to Carbon fiber space structure - Frame
Similar structures have been successful used at creation design
Of Inner Trecker System ITS of experiment ALICESuch space CF Frames have the best parities weight-
rigidityand allow to create on their basis the finished assembly of
detectorsLadders, including:- Hybrids ( silicon detectors or modules of detectors with
cables and plates of end electronic- Basic fixing elements- Cooling system of plates of end electronics
Detector’s module Detector’s module
E
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Carbon fiber frame
Material: CF prepreg M55J/ 334EUModuls of composit 27000Gpa
Detector’s plates holder
Materials: Fiber glass(E-glass + epoxy glue )
Each end of ladder have a final support. Final support consist of: some plate with precise basis elements (surfaces) and two prism’s
Assemblage of end support’s and frame perform on the assembly jig at the same time with detectors holders.The precise of assembly jig ensure precise disposition the all elements of ladder
Ladders support system
The parts of cooling systemThe parts of cooling system
Coolant fluid
Option 1 - fixation detects plates in parallel of horizontal plane in chess order- Provide compact configuration but demands are bend of the cables
Option 2 – fixation of detectors plats under an inclination-Provide compact configuration and don’t demands are bend of the cables, butnot conveniently for installation.
Option 3 – fixation detectors plates in parallelOf the horizontal plane, each detector shifting in parallel in one direction. - Provide easy installation, but demands more place and increases zones of overlapping between ladders
Arrangement of detector’s plates on a ladder
Typical construction of the ladder
The position of detectors for Station 4The position of Si detectors plates from centre:1. 22x62 + 42x62 + 62x62 + [62x62]x32/3/4 - 42x62 +62x62 + [62x62]x35 62x62 + [62x62]x36 [62x62]x3
1 2 3 4 5 6
As we see, each subsequentladder it turns out by exceptions of the central plates of detector
Nr 1
Nr 2, 3, 4
Nr 5
Nr 6
The length of the ladders for ST 4
Length of the ladder from centre to periphery of station decrease proportionally 40mm i.e. to a step of the carbon frame, but thelength of the cables in the hybrids are kept.
Construction of STS station Nr 4The station consist of 4 frames. On each are fixed 3 ladder’s with detectors.The frames with ladders are fixed on the slides of main support of STS
Tilling and distance between sensors
Ladder’s installation and fixation
Schematic fixation of frames on the main support STS
Some slides for ladder’s frame are fixed on the main support of STS .The frames with ladders are positioned on the slide : for top support - ball on plane with flat springs for down support – ball on prism
The main current tasks
1. Определить и описать параметры тепловых потерь и провести предварительные расчёты
условий обеспечения температурного режим эксплуатации кремниевых детекторов,
Рабочая температура на плоскости детектора (-5грС) +/-
Рабочая температура в объёме детектора……+/-…..
Рабочая температура платы электроники гибридов …..не более
Время непрерывной работы детектора (длительность сеанса)……..
Для предварительных расчётов можно использовать следующие данные:
- Наиболее нагруженная зона - центральная зона плоскости станции, в частности детектор
22х62мм ( J=100мка/см2 U=300V )
- Тепловыделения на остальных пластинах детекторов уменьшаются от центра к периферии пропорционально радиационной нагрузке.
- Тепловые потери на плате электроники гибрида 2W
- Тепловые потери в кабелях отсутствуют
В качестве хладогента для воздушного охлаждения использовать инертный осушенный газ (азот, гелий ?), для жидкостного охлаждения фреон.
2. Провести оптимизационные расчёты по механике углепластиковой фермы исходя из предложенных размеров и параметров материала.
3. Предложить концепцию системы охлаждения с учётом результатов предварительных расчётов
