1. Reflectometry STAP Meeting ESS, 29th of April 2019
Introduction & Update
Reflectometry STAP Meeting
ESS, 29th of April 2019
Ken Andersen, Neutron Instruments Division, European Spallation Source ERIC

2. Welcome! We are now on a regular schedule Format of this meeting:
2 STAP meetings per year, synchronised with SAC meetings
Reporting to SAC meeting
Spring: short video meeting
Autumn: longer physical meeting
Format of this meeting:
Focused on status updates and current hot topics
Last vidyo meeting was a test – improvements made

3. Purpose and Remit of Instrument STAPs
Scientific and Technical Advisory Panels
one per instrument class
STAP: instrument advisory body
science case and functional requirements
all aspects which impact on scientific output of instrument (not just instrument project)
technical and project decisions
early science
Advice to both NSS management and instrument teams
collaborative & non-adversarial setting
NSS management & instrument teams take advice constructively
allows NSS management & instrument teams to make good, informed decisions
Each STAP meeting results in written recommendations
followed up in subsequent meeting(s)
presented at following SAC meeting
SAC report includes highlights of STAP reports – presented to Council

4. December Annual Review
Recommendation A2.1
“The Committee believes that resources laboratory-wide should now be focussed on achieving at least the minimum criteria for a “day 1 of science” milestone. This will necessitate postponing activities which are not needed for the new focus, and reallocating resources between the key project areas (CF, Accelerator, Target, NSS). This focus will also provide a powerful driver toward cross-directorate cooperation and the effective centralisation of certain functions and capabilities, which inevitably must be done, but which will be of greatest benefit if it precedes installation. Scheduling and risk prioritisation/mitigations should be adapted to reflect the importance of this new milestone”

5. Rebaselined Schedule for Neutron Beam Instruments V4
Rebaselined Schedule for Neutron Beam Instruments V4.1, 29th November 2018
aligned with accelerator ramp up (ESS )
West sector
North sector
East and South sectors
Current date
First access to NSS bldg (E01)
SOUP
(3NBI*)
BOT
8NBI* in User Program
Preliminary Design
Detailed Design
Manufacturing & Procurement
Installation & Integration
Hot Commissioning/Early science
Operation ES
March 2023:
Early Science with expert users (ES)
Selection of first NBI for SOUP
* NBI = Neutron Beam Instrument

6. Highlights from October SAC meeting
Backup scenarios for first three instruments
First three: DREAM, LOKI, ODIN
Backup for DREAM is MAGIC
Backup for LOKI is SKADI: decision point in mid-2019
No direct backup for ODIN: take any of the other first 8
Early Scientific Success = trusting your instrument
Thorough hot commissioning, focused on benchmarking
STAP reports highly appreciated
Constructive and direct information given
Instruments should make full use of V20 in 2019
Capability gap analysis is good starting point
Be careful not to give impression of decisions already made
Reinstate STAPs for spin-echo and particle physics
Start annual proposal rounds
Prioritise unique concepts
Evaluate instrument completion together with new instruments
Move ahead quickly

7. What else has happened since last time
All instruments have passed TG2
New “Early Science” milestone identified
Expert users on first instruments in 2023
Initial Operations funding
All countries working to fund the Initial Operations period
Common shielding project moving ahead with 9 instruments
PDR took place in January
Only for instruments with long guides – no reflectometers included
Evolving boundary conditions for shielding
Creation of ”blue” zones on cave roof
Dose constraints in nearby offices
TAs are finally progressing quickly
But not quickly enough!

8. Charge for this meeting
Instrument teams
Prepare status reports and present them for discussion
Identify hot topics and raise them
Provide feedback on actions
NSS management
Organise the meeting
Inform of main developments since last meeting
STAP
To what extent have the teams and ESS progressed in regard to the actions laid out at the last meeting.
Are there any significant concerns that need attention between now and the next STAP meeting (September)
To what extent will the plans for data analysis support the delivery of early science

9. Actions from Last Meeting
ESTIA:
Recommended action Item #1: Further tests, analysis and report on the multiblade detector.
Note progress. Issues to be further explored: engineering solution to long term stability (e.g., pressure and temperature variation), homogeneity, cross-talk between pixel elements, count rate and challenges to test the detector under extreme conditions (beam intensity).
Recommended action Item #2: Report on comprehensive background calculation.
Note any progress towards understanding the extrinsic background. In addition to any work you have done, you can note the fact that this has been raised to the NSS level with Ken and a request for calculations from the neutronics team has been made.
FREIA:
Recommended action Item #3: McStas simulations to produce R(Q).
This action is to produce a reflectivity curve from a model sample in mcstas using the WFM (high resolution) option with a view to understanding normalisation issues.
Both Instrument Teams:
Instrument scientists should engage in hands-on experience at a TOF reflectometer.
ESS:
The STAP expressed concerns about the DMSC strategy for reflectometry analysis software, namely the choice of developing BornAgain to support specular reflectometry.
The STAP were concerned by the lack of ESS management participation in the STAP meetings.

10. Thank you!
ESS site 2016
5th June 2015