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S ynchrotron-light for E xperimental S cience and A pplications in the M iddle E ast . X-ray Absorption Spectroscopy at SESAME “BASEMA Status” . Messaoud Harfouche. Answers to Previous Questions and suggestions. What is the vision for BASEMA BL

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answers to previous questions and suggestions
Answers to Previous Questions and suggestions
  • What is the vision for BASEMA BL
    • Focus on the XAFS techniques (XANES, EXAFS, XRF, XRD)
    • Need to meet user demands
    • Beamline scientist can propose different techniques that can be combined with XAS
      • RAMAN is the widely used technique and maybe the cheapest
      • XES, HERFD, RIXS are the most advanced techniques but very expensive and needs special design (can’t buy as a complete system)
        • Need multitude of bentcrystals (larger is the number better are the results)
        • Need different type of crystals to cover all the energy regions
    • Priority should be given to build a strong XAS user community
      • Need to connect with universities in the region (not that easy)
        • SESAME should offer joint positions with universities (home universities ) to beamline scientists
        • Sign MoUs with universities and research institutions
        • ……..
      • Need to encourage scientists to develop their own research and allow collaborations among the members and other countries.
answers to previous questions and suggestions1
Answers to Previous Questions and suggestions
  • Modify the DCM to use MCM & Easy exchange by users
    • The DCM doesn’t allow motorized crystal exchange  lots of time to change the crystals  need mechanical & vacuum technicians
    • Gain in flux but loss in resolution  can’t be used for most of EXAFS measurements
    • Flux on the sample is good enough even at higher energies - ~30 keV- if good detectors are used.
    • Cost of such a modification is very high (according to Ricardo SenioratoBruker ‘former Accel’)
answers to previous questions and suggestions2
Answers to Previous Questions and suggestions
  • A future upgrade of beamline to use KB focusing system to achieve 3x3 mm2
    • Ray tracing calculations already performed
    • Beam size from the source is too large  difficult to focus
    • Smallest beam size that can be achieved is 8 x 10 mm2 with a flux of 5 x 109 ph/sec at 8 keV
    • The option of short beamline is excluded
      • need a small intermediate source point with small demagnification
    • Smaller is the beam size - lower is the flux on the sample
    • Project for a micro-focusing beamline on insertion device (Undulator) can be proposed for phase II beamlines (to be proposed by potential users)
answers to previous questions and suggestions3
Answers to Previous Questions and suggestions
  • What makes a good beamline?

Stability and Low noise are key factors!

    • Beamline scientist totally agree on this proposition
    • It is a practical matter rather than calculations and design issue
      • Need to minimize the number of motorization and disconnect the non used ones.
      • Find a system that allows to disconnect a motor remotely and make it passive as soon as it is not used.
      • Find the adequate solution for internal and external cooling system.
      • Use insolating material between the ground and girders for the optics components
      • Other tricks can be collected from experts – starting from SAC/BAC
answers to previous questions and suggestions4
Answers to Previous Questions and suggestions
  • Being competitive by having reliable and impressive software
    • data acquisition and control software
      • A sketch (Mock-up) of the data acquisition software is already done
      • See the demonstration version
      • Will be discussed with control group
      • Need a very good physicist who is a good programmer or a very good programmer and good in physics.
    • Data reduction and analysis
      • Many software are developed
        • Ifeffit , WInXAS, XAFS, EXAFS pour le mac, PyMCA, fit2D, Match, etc.
        • Some have active mailing list and provide help for the users.
      • Users are free to use there own software
other comments
Other Comments
  • Opening of the boxes from ESRF
    • On going (with many delays)
      • Monochromator has been opened and inspected in presence of an expert (A. Simionovici)
        • Visual inspection (internal, external)
        • Testing of stepper motors, cooling and vacuum system
        • Could not test all the motors and signals (No control hardware)
      • Other beamline components are in testing phase
        • XBPM, Slits, Wire monitor
      • The opening of the VCM mirror is delayed until receiving the second mirror VFM
        • Metrology tests are already done at ESRF (thanks to Amparo Vivo)
        • Need an expert who worked with ZEISS mirror mechanisms (Eric Detonna, ESRF)
other comments1
Other Comments
  • Budget estimation of the control system
    • Discussed with 3 beamline scientists from SOLEIL
      • SAMBA, DiFabs, ODE
    • The average construction budget for a beamline at SOLEIL was given by the control group (Pascale Betinelli + Yves-Marie Abevin)
    • Will be shown in details at the end of this presentation
  • Annual upgrade budget
    • Not needed at this stage of the construction
slide9

Users recommendations and wishes

  • Raman technique will be a good technique to be combined with XAFS, XRF and XRD
  • Need for a cryojet or cryostat for biological and some environmental samples.
    • Needs for users will be submitted as proposal through EUC or directly to BL scientist
  • Should focus more on building the users community which leads to scientific collaborations between users
  • A large beam is needed for bulk measurements and 10x10 mm2 is a good beam size for many applications.
current status of basema
Current Status of BASEMA
  • CDR has been written and ready to be reviewed
  • TDR has been started
    • 3D drawing of all the components is ongoing (Akrum)
    • Inspecting, testing and documenting the optics components
  • Research vision for the beamline (preparing students, collaborations)
slide13

BASEMA Port D08

by Adel Amro

Booster

Storage ring

Beamline

machine
Machine:

Can’t go to higher Energies due to the machine performances

beamline characteristics
Beamline Characteristics

Energy range

  • Lower limit due to absorption of air in the EH
  • Higher limit due to machine limitation
spectral energy range 4 30 kev

: K- edge

Spectral energy range (~4 –30 keV)

: L- edge

: Difficult

It will be hard to probe some elements at verylower concentrations

beamline hutches
Beamline Hutches

OLD

Experimental Hutch

Experimental Hutch

Control room

Control room

Lab.

Control racks

Control racks

Optics Hutch

Optics Hutch

NEW

hutches optics layout
Hutches & Optics Layout

Experimental Hutch

Control room

Control racks

Optics Hutch

beamline optics
Beamline Optics

VCM

VFM

Still at ESRF:

to be delivered with BM16 comp.

Arrived at SESAME:

will be opened once VCM arrived

beamline optics1
Beamline Optics

Surface Roughness

13 points evenly spaced by 50.8mm are measured on each strip

beamline optics2
Beamline Optics

Averaged rms values

VCM

VFM

beamline optics3
Beamline Optics

Micro-roughness RMS distribution on VCM stripes

Si

Pt

beamline optics4
Beamline Optics

Micro-roughness RMS distribution on VFM stripes

Si

Pt

beamline optics5
Beamline Optics

LTP measurement VCM (Slope error)

  • Slope errors correspond to residuals to the best cylinder
  • Three parallel traces spaced by 15 mm are measured on each stripe

Si

Pt

bender performances were not checked

beamline optics6
Beamline Optics

LTP measurement VFM (Slope error)

  • Slope errors correspond to residuals to the best cylinder
  • Three parallel traces spaced by 15 mm are measured on each stripe

Si

Pt

bender performances were not checked

beamline optics7
Beamline Optics

Power density calculated on the surface of the Si coated stripe of the VCM

Thermoelastic calculations (FE)

Without cooling

With cooling

beamline optics8
Beamline Optics

DCM

  • ROBL DCM at ESRF
  • Arrived to SESAME
  • Opened in presence of an
  • expert (A. Simionovici)
  • Discussions and decisions:
  • Use the current set up of cooling system for whole period of commissioning
  • Mount the bender for the second crystal once we have beam through optics
  • to experimental hutch
beamline optics9
Beamline Optics

Tests on the DCM

  • Stepper

motors

beamline optics10
Beamline Optics

Tests on the DCM

  • Cooling System
beamline optics11
Beamline Optics

Tests on the DCM

  • Cooling

System

beamline optics12
Beamline Optics

Tests on the DCM

  • Vacuum

System

beamline optics13
Beamline Optics

Problems encountered

Some Controllers still at ESRF for pico- and servo-motors

No controller at SESAME

Vertical motors can’t be mounted

(need to be fixed on the floor)

  • Drops were observed on the first crystal
  • Contacted optics groups at ESRF, APS
  • Need to find a way to clean them
beamline optics14
Beamline Optics

Other Components

  • All the components from ESRF were unpacked Except the VCM
  • Test is ongoing for the motors and motor controllers
  • Cooling and vacuum will follow soon
  • Tested components will be covered and stored in the Lab.
  • Primary alignment of the components will be done at the end
optical properties at the sample position
Optical properties at the sample position

Si(111) crystal

Si(311) crystal

optical properties at the sample position1
Optical properties at the sample position

Number of photons on the sample (S1)

without focusing system (KB)

kb focusing system
KB Focusing system

KB parameters from secondary source

Ray tracing simulation results

kb focusing system1
KB Focusing system

Secondary source (S1 sample)

Focused beam (S2 sample)

8x10 mm2

~5x109 Ph/sec

estimated costs
Estimated Costs
  • Materials Costs (M$)
  • Interface (hutches and infrastructure) 0.50
  • Front End 0.15
  • Beamline Optics0.49
    • XBPM 0.10
    • Crystals for DCM 0.04
    • Modifications on the existing optics 0.10 (if needed)
    • Focusing system (KB+microscope) 0.25 (To be discussed)
  • Vacuum System0.03
  • Computing and Control System 0.40
  • Hardware (PCs, VME, drivers,…) 0.3
  • Software and DAQ 0.1
  • Furniture End Station 0.51
  • Tables (2) 0.12
  • Detectors
    • ICs, diodes and gas mixing system 0.04
    • SDD (1) 0.05
    • Multi-element Ge detector 0.30 (promises for 7e Ge detector S.H.)
  • Total costs with focusing system 2.08
  • Total costs without focusing system (-0.25) 1.83
slide41

Other Activities

  • IAEA Coordinated Research Project (2 proposals)
    • Adsorption and mobility of heavy metals in soils in the vicinity of
    • Jordanian- and Yarmouk- rivers (SESAME project)
    • Antimony as an element with environmental concern and its pollution in Mongolia collaboration project between SESAME, Jordan and The Institute of Chemistry and Chemical Technology, Mongolia
  • Accepted proposal for joint SESAME/ICTP School
    • Advanced School on Synchrotron Techniques in Environmental Scientific projects
  • SESAME-ICTP
  • Co-supervising a Master Student from Al-Quds University
    • Upgrade of BASEMA “the XAFS/XRF Beamline at SESAME” and application to a scientific case
  • Co-supervising a Master Student from Jordanian Uniersity
    • Heavy metals in the vicinity of Jordanian and Yermok rivers soils
acknowledgement
Acknowledgement
  • Andreas Scheinost (ROBL, ESRF)
  • Amparo Vivo (metrology Lab., ESRF)
  • Alexander Simionovici (Univ. Josef Fourier and ESRF)
  • Thiery Moreno (SOLEIL, France)

SESAME Staff

A. Amro,

T. Abu Hanieh,

Y. Moumani,

F. Al-Omari,

A. Attyeh,

M. Shehab

M. Al-Najdawi,

S. Budair,

O. Noor,

M. Al-khalili

etc.