1. Dose levels at the SPS, monitoring and calculation.
Oliver Stein (EN-EA)

2. Radiation monitoring at the SPS
Questions:
What is the dose in the SPS tunnel at specific positions (dcum,x,y)?
What is the expected dose?
Where are the hot spots?
Installed detectors:
268 BLMs active
RadMons active
RadFets passive
RPLs passive
Can we calculate the dose in the tunnel?
by using available data sets

3. BLMs in the SPS BLMs are actively logged in the LDB. Data Grays/cycle
Data extracted for 2016
Data weekly summed
Data volume is much smaller than the LHC BLM data
Comparison with 2015/2012 ongoing
Data of the SPS BLMs, summed for SPS layout
LSS 1
LSS 2
LSS 3
LSS 4
LSS 5
LSS 6

4. BLMs in the SPS Regular FODO structure in the arc sections.
Simulation of one FODO sufficient?
Distance functions
For straight section more detailed
models necessary!
FLUKA simulation for LSS 2 ongoing
FODO structure
Dipoles
Quad Defocus
Quad Focus

5. SPS dose calculation
Calculating the dose from interpolated BLM data and distance models.
RadFets
RadMon
BLM
Functions
(dcum,x,y)
FLUKA
Other…
Other
Interpolation
Distance Models
Data extraction
Interpolation
Distance models
Distance functions
Error function
Dose in the tunnel + uncertainties  Dose maps of the SPS tunnel
Dose (dcum,x,y)

6. SPS dose calculation plan and status
Python frame work
BLM data included
Interpolation of BLM data
Distance Models
Simple distance function (dcum,x,y)  SPS layout used for segmentation
FLUKA models  SPS LSS 2 simulation ongoing
Calculation of uncertainties
More sophisticated functions/models
Testing
Stability of the models  Influence of optics changes, layout, etc.
Comparison with non included data
Dose resolution limits
Spatial resolution, details
Time estimation: 2 Month +

7. Very simple model, exemplary visualization
SPS dose calculation
First examples:
SPS dose map for dcum 0 to 200 at y = 0
Very simple model, exemplary visualization

8. Very simple model, exemplary visualization
SPS dose calculation
First examples:
Very simple model, exemplary visualization

9. SPS dose calculation First examples:
Very simple distance functions: 1/r2
Used layout for defining regions with different distance functions (scaled)
Magnets shield the radiation
Drifts sections shield less
More input for models needed.
Lorentz boost not included yet.
SPS dose map for dcum 0 to 200 at y = 0
Very simple model, exemplary visualization

10. Goals:
Creating a “modular tool box” for calculating the dose in the SPS tunnel.
Dose estimations with uncertainties for all positions of the SPS tunnel.
Continuous benchmarking with new measurements and simulations.
Optimisation of the existing models.
Questions:
Shall we continue?
Who is participating?

11. Thank you!