1. CSPEC Detector Kick-off Workshop Design of the Detector - Overview of key parts to be manufactured
Michail Anastasopoulos
Lead Detector – Design Engineer
Ioannis Apostolidis
Mechanical Engineer
European Spallation Source ERIC
18/01/2019

2. Contents 1. Detector design
The CSPEC grid
Supporting peripherals
2. Detector vessel design and manufacturing
Vessel requirements
Concepts & Evaluation
Vessel design
MG SEQ test
Gas & Pressure
3. Current status & next steps

3. Detector design – The CSPEC grid
Modular, blades & block design
Minimum no. of blades/grids required:
- 15,120 (radial-outer)
- 37,800 (radial-inner) ,440
- 128,520 (normal-coated)
- 7,560 grids
Outer blade
Normal blade (coated)
Inner blade
Grid block
Photo of triple + T.REX grid

4. Detector design – The CSPEC grid
Optimization for the B10 coating process: triple blade design
Early triple blade version to test fitting

5. Detector design – The CSPEC grid
Grid configuration for CSPEC:
25x25x10mm voxel grids/column
6x16 voxel grid x columns/vessel n n

6. Detector design – Peripherals
3.6m slider system (54x)
Design of supporting detector peripherals
Different types of PCBs (648x wire PCBs, 378x back-bone PCBs)
Total numbers of each item
End-grids (108x)
Back-bone (54x)

7. Detector vessel design and manufacturing
Vessel requirements:
135deg theta / 3.5m high / ±26deg vertical angle coverage
Dead area comparable to current state of the art spectrometers (IN5, LET, etc)
Voxel gap between adjacent detectors: ≤ 1x voxel
Trade-off between vessel thickness and scattering
Compatible with vacuum tank provisions for installation and maintenance
MG SEQ vessel pictures
Vessel production currently out of the CSPEC detector cost as defined at Scope Setting

8. Detector vessel design and manufacturing
Concept analysis and evaluation
Images courtesy of I. Apostolidis
Trade off between size, weight, stiffness, stress 8
Analyses of different configurations during concept design phase
Stress distribution of interim design

9. Detector vessel design and manufacturing
4mm bend plate (window) - 25mm thick back-plate
No middle stiffener, no need to align grids, lighter detector (<300kg)
3750
288
Main vessel parts/geometry ADD vessel images
322

10. Detector vessel design and manufacturing
Array design:
20mm dead space between adjacent detectors
27x single compartment / 2 column vessels
Complete detector array n
Voxel gap between adjacent detectors: 20mm

11. Detector vessel design and fabrication
Minimize dead space:
2 types of vessels with short/tall configuration and short/tall electronics box
5mm clearance between vessels
Detectors are aligned internally

12. Detector vessel design and fabrication
Electronics box & vacuum interface:
2 different e-box types with access windows
Integrated vacuum interface for cables & cooling
Extra window image
Simplified section view of e-box and vacuum interface
Electronics box with access window

13. Detector vessel design and fabrication
Concept tested on MG SEQ (2018)
Lessons learned:
Change geometry of welded connections
Replace gaskets by o-rings
Provide separate lifting points for various handling operations
Replace threads by inserts at certain areas
Mention Differences between SEQ and CSPEC vessels – 3D comparison (section)
MG SEQ 3D model and actual installation at SNS

14. Detector vessel design and fabrication
Gas and pressure
Detector is pressurized with ArCO2 inside vacuum
2 scenarios considered for gas operating pressure:
0.5bar (Candidate gas system design from ILL / fail scenario: Detector pressure = atmospheric)
1.0 bar (Vessel wall modifications due to EU Pressure Equipment Directive - see N. De Ruette’s talk)
Validation at 1.43x the operating pressure
Final decision after prototype tests
ArCO2
0.5bar
Detector
Pressure Schematic
atm
Electronics box
vacuum

15. Current status & next steps
Fairly close to final design – Only minor changes expected after prototype production
RFQ sent out already for 3.5m prototype - Vessel expected by May 2019
Thorough lab testing planned (handling, assembly, pressure tests, metrology)
Preparation of Tender for the 27 Detector vessels
On schedule with the IDR (Oct ’19) and TG3 (Nov ‘19)
Design in collaboration with CSPEC engineers & scientists and ESS Vacuum group

16. THANK YOU