1. Path to BEER upgrades
STAP meeting – Phase 2

2. ESS proposed upgrade evaluation plan
FoM = (Counting Rate Gain Factor x Science Capability) / SQRT(Disruption x Cost)
Counting Rate Gain Factor: gain factor compared to day - one version, scaled by how large a fraction of experiments make use of the upgrade
Science Capability: scientific impact of the upgraded configuration, ranked from 1 (low) to 5 (high)
Disruption to User Programme: Ranked from 1 (low) to 5 (high)
Cost: The cost in M€ of the upgrade, rounded up to 1 for upgrades which cost less than 1 M€
Cut-off FoM is about 1.5
STAP advice about the input metrics to the FoM calculation

3. BEER upgrades list Multiplexing and resolution-enhancing choppers
Sample movement system, focusing guide, etc.
Detectors: doubling the area and adding backscattering bank
Texture detectors
SANS option including modulation chopper
Total cost of all upgrades 9.3 M€

4. BEER upgrades list with FoM
Cost breakdown (M€)
Counting Rate GF
Science Capability
Disruption
Cost
FoM
Multiplexing and resolution-enhancing choppers
0.75
1.50
2.00 3
1.00
1.73
Sample movement system, focusing guide, etc.
1.14 2
1.49
Detectors: doubling the area and adding backscattering bank
3.11
2.50 1
2.13
Texture detectors
2.64
1.54
SANS option including modulation chopper
1.66
3.00 4
1.16

5. Multiplexing & resolution-enhancing choppers
Cost breakdown (M€)
Counting Rate GF
Science Capability
Disruption
Cost
FoM
0.75
1.50
2.00 3
1.00
1.73
3rd pulse chapping chopper
Enable the high flux option which triple the flux on the sample
Increase the versatility of the instrument – more options for resolution setup
Allow to fast in-situ measurement
3rd and 4th phase selection choppers
Increase versatility of the instrument – enable pulse suppression (double wavelength band) and alternate frame (different wavelength ranges) modes
2nd modulation chopper
Advanced modulation mode setting – tuneable multiplication factor
All positions ready for the installation by the time of construction – low disruption when installed as soon as possible

6. Detectors – doubling the area
Cost breakdown (M€)
Counting Rate GF
Science Capability
Disruption
Cost
FoM
3.11
2.50
1.50 1
2.13
Adding two additional detectors (1x1 m2) at 50° and 130°
Increase the detection are for in-situ phase transformation measurement
Access to the wider d-range (big unit cell – 50°, higher resolution – 130°)
Adding of backscattering detector (0.5x0.5 m2)
High resolution data for in-situ multi-phase system analysis
Cave ready for installation by the time of construction

7. Texture detectors
Cost breakdown (M€)
Counting Rate GF
Science Capability
Disruption
Cost
FoM
2.64
1.00
2.50 1
1.54
Adding three 0.5x0.5 m2 off-plane detectors at 1 m distance
Increase of detector off-plane coverage for texture analysis without rotation
Detectors frames are designed for future arc holding – small disruption

8. Sample movement system, focusing guide, …
Cost breakdown (M€)
Counting Rate GF
Science Capability
Disruption
Cost
FoM
1.14
1.50 2
1.49
Adding horizontal focusing guide before the sample
Increase the flux by factor of three – but with high divergence
Exchangeable lift installed by the time of construction
Enhanced sample positioning system
Adding the heavy z-axis table in the sample tower
Increase the range of the sample positioning system for ±25 cm in x, y direction
Laser tracking system for enhanced robot positioning
Sample tower design for smooth reassemble is crucial

9. SANS option Installation of the 3rd modulation chopper
Cost breakdown (M€)
Counting Rate GF
Science Capability
Disruption
Cost
FoM
1.66
1.00
3.00 4
1.16
Installation of the 3rd modulation chopper
Enable the usage of one pulse for SANS and one for modulated diffraction – alternating frame mode
Installation of the SANS detector
Enable quasi-simultaneous measurement of in-situ SANS and diffraction
Increase the versatility of the instrument – opening of the new science
Cave is ready for adoption SANS tube, disruption is mainly due to the modulation chopper installation in bunker area