Software Commissioning and Development for the SNS Liquids

Software Commissioning and Development for the SNS Liquids Reflectometer John F. Ankner Spallation Neutron Source, ORNL

Reflectometry Lauter-Pasyuk, et al. Hamilton, et al. Krueger, et al. OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY

Choppers Reflectometer Robot Detector Environment Positioning OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 3

Data Handling at SNS - Theory · Data Acquisition - Component control · Detectors – data collection · Choppers, Motors, Environments - Instrument network · Data Analysis - Archiving - Reduction - Modeling / Fitting DANSE OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 4

Data Acquisition - Detector [Rick Riedel, Ron Cooper] OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 5

Data Acquisition - Positioning [Gayle Greene, Andre Parizzi] OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 6

Integrate Detector and Positioning Integrated Control • Implement scans • Define file formats • Ex-archive data This ongoing activity not in original plan and largely done by LR team – Big Job [Xiaodong Tao with help from Gayle Greene and Rick Riedel] OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 7

Rocking Curve Scan first slit across incident beam – typical alignment scan Eventually part of control package – for now: e-mail -> Excel -> Sigmaplot OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 8

What Do We See? Background OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 9

Guide Vertical Divergence Scan Simulated Background – 1 st gen. slits 2 nd gen. 10 -3 better Horiz. bender cuts short wavelengths; must practice slit alignment Measured 10/28 (note axis swap) 10 msec ~ 3 Å Leakage past slit bottom OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 10

Measure Reflectivity ÷ = unphysical - backgnd. ? or unphysical - count rate? ? [Michael Reuter and Peterson] OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 11

Define Region of Interest [Jean Bilheux] OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 12

Subtract Background Beam power 25 k. W Scan time ~1 hour Shielding minimal [Xiaodong Tao, Michael Reuter, Mike Kilbey, Jean Bilheux, Candice Halbert, Peterson] OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 13

Adapt NIST Reflpak to tof at SNS Analysis Reduction Common Platform OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 14

Data Handling at SNS - Practice · Data Acquisition - Component control · Detectors – data collection · Choppers, Motors, Environments - Instrument network • System Integration · Data Analysis - Archiving - Reduction - Modeling / Fitting –Unified data acquisition –In-house + external reduction and analysis U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 DANSE OAK RIDGE NATIONAL LABORATORY 15

Final Thoughts · We’ve made a great deal of progress · Much effort required to vertically integrate into a single instrument the acquisition and analysis functions of our horizontally structured support groups · Large software burden on instrument team - Acquisition integration an ongoing and significant effort – visualization, choppers, logging, environments, robot, … - Need help with Reflpak (DANSE) integration · Need to improve performance of codes OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY DANSE Workshop January 22, 2007 16