11 Apr 2005 K. Lieutenant VITESS 2.6 1

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Klaus Lieutenant

Status of VITESS and new release, version 2.6

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McStasPresent Status

Staff Michael Fromme (HMI; GUI and release versions) part time Sergey Manoshin (HMI; modules and applications) until end of

May 2005 Géza Zsigmond (PSI; modules and applications), part time Klaus Lieutenant (ILL; modules and applications) , part time

Version 2.6: Release: June 2005

Future maintenance Geza's modules: Geza Zsigmond Klaus' modules: Klaus Lieutenant Sergey's modules: ???

Further development: ???Michael Fromme has spoken to Ferenc Mezei, seeking his goals and opinions. For F. Mezei, Vitess is in an operational phase, and questions concerning the modules would be handled by the module responsibles; there is a commitment of Geza + PSI. At HMI, there will be no physicist assigned to scientific developments. M. Fromme assured him that he would continue to care for the Vitess web pages, to distribute the code and to update the GUI in the same quality as before.

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McStasNew Features in Vitess 2.6

New modules 'polarising mirror' 'elliptical mirror' 'grid'

General options 'instrument digest' calculation of errors of intensities (in the output)

New features in modules Chopper : 4 windows allowed Monitor : peak flux in time monitor Guide : focus point used as parameter for elliptical shape Window etc : positioning of components without defining a new co-

ordinate system Improved module 'chopper_fermi'

odd number of channels 'set zero time' corrected TOF calculation corrected shadowing cylinder treated improved treatment of long wavelengths

Tool 'GenerateMirrorFile' can create a reflectivity file with smooth cutoff

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McStasModule ‘pol_mirror’

Module simulate a plane mirror with different reflectivity for up- and down neutrons transmitted or reflected beam can be regarded mirror can be placed arbitrarily any output frame can be defined demanded by people from FZ Juelich

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McStasModule ‘elliptic_mirror’

Module simulates an elliptic mirror (part of an ellipsoid surface) mirror can be placed and

oriented arbitrarily different reflectivity for

up- and down neutrons any output frame can be

defined visualisation possible demanded by people from

FZ Juelich part of PhD S. Manoshin

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McStasCollimation grid

Use of a high number collimators as an alternative to focussing in SANS instruments concept invented by F. Mezei module written by S. Manoshin within his thesis used to simulate the new VSANS instrument at HMI

Channels, where neutronsAre moving

Detector planeSample plane

grids

Relative distance

Absolute distance

Center ofdetector

1243,19 mm

Space between channels

Multi pinhole collimation system, (picture taken from thesis S. Manoshin)

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McStasInstrument Digest

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McStasRecent simulations with VITESS

Instruments recently simulated with VITESS H8 (Brookhaven) NEAT (HMI) VSANS (HMI) IN14 (ILL) …

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McStasLooking ahead to Vitess 2.7

Ideas Figure of the instrument Reorganisation of monitors NeXus data format will be installed Improved module detector Numerical optimisation New tool: 'Chopper Positions‘

Realization and time scale Figure of instrument: in work

Rest: ???

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McStasAcknowledgement

This research project has been supported by the European Commission under the 6th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures. Contract n°: RII3-CT-2003-505925

Thank you for your attention !