The Endstations

Off-Line Instruments and Tools

Tool/Instrument Specifications Location
Hot Plate 50° C-500° C
Max Load 5 kg.
Max dim. 200x200 mm.
On the table between BACH acquisition room and LASER hutch
Ultrasonic Cleaning Machine   On the table between BACH acquisition room and LASER hutch
Electrical conductive UHV compatible silver epoxy Epo-Tek H21D (old) or H20E (new) BACH acquisition room
UHV compatible Carbon tape; Several sample Clamps   BACH acquisition room
Hot gun    
N2 gas line   close to the LASER hutch
Water cooling circuits   close to the LASER hutch
Electric Drill   Black box in the cabinet between BACH acquisition room and LASER hutch
Diamond Files, Sample preparation tools   BACH acquisition room
Pyrometer (reads above 300° C )   Main Chamber area
UHV Thickness monitor Sycon Instruments STM-100/MF (it can be mounted on the preparation chamber)
High vacuum sample storage box   T-REX area
Electromagnet (OFFLINE!) up to ~2 Tesla Between BACH acquisition room and LASER hutch
Sample holders

1 standard VG XL25VH

2 standard VG XL25HC

2 home-made sample carriers for heating by filament (for radiative sample heating up to 300° C or electron bombardment)

2 home-made sample carriers for heating by direct current up to 10 A (e.g. Si, Ge, SiC)

BACH acquisition room


Endstation B

This endstation is located at the end of the branch A where the spot dimensions on the sample are about 350x40 micron2. The experimental setup of the BRANCH B hosts a new endstation dedicated to x-ray magnetic circular dichroism in high magnetic fields (± 6.5 Tesla) along the beam and variable tempertaure from 1.9 K to 340 K on the sample in a base pressure of 4x10-11 mbar.  A surface preparation chamber will be connected for the investigations of the magnetic propertis of in situ grown samples. The endstation can be also used for pump-probe time-resolved XAS/XMCD spectroscopy experiments.

This endstation has been assembled and installed at the end of 2011/beginning 2012. The first phase of the installation (superconducting magnet installation, magnet canister welding, T probes and current leads connections, electrical checking, and He leak check of the magnet canister and tank) has been performed with success in December 2012. The second part of the installation has been performed in January 2012. In March 2012 we have performed the on-acceptance tests with success!! We have reached the min T (1.8 K) and max T (340 K) on the sample and ±6.5 Tesla with a ramp rate of 1T/min with no quenches in a base pressure of 3.9x10-11 mbar (only by cryopumping). In March 2013 we have performed the first XMCD experiments and the endstation is now open to users.

Endstation A+T-Rex Laboraory= Time-resolved pump-probe XAS

The time resolved XAS/XMCD setup is operating at the Branch A of the BACH Beamline. The experimental setup combines Laser and Synchrotron Radiation (SR) in order to study the dynamics of the photo-induced excited states of electronic and magnetic systems. 

The X-ray absorption spectroscopy (XAS and XMCD) open up various opportunities to probe laser-induced changes of the electronic, magnetic and geometric structure. The properties of the TR-XAS/XMCD@BACH endstation offer wide experimental conditions with respect to repetition rate, overall energy range, time-resolution, operation modes of the Synchrotron source and sample experimental enviroments.

Elettra Synchrotron radiation source provide radiation pulse widths sufficiently short to investigate dynamic processes in the time between 60 ps up to 0.5 μs. Typically, optical excitation of the sample is done by laser pulses (synchronized to either hybrid or multi bunch SR pulses), and probing is performed by time-delayed synchrotron radiation pulses. For the optical excitation of the sample we use a regenerative amplifier system (RegA9000 from Coherent) providing 5µJ photon pulses at a repetition rate of 250 kHz or a Mira HP Ti:Sa oscillator with a pulsepicker and produces 25nJ pulses with a repetition rate tunable between 1 and 83.3 MHz. The XAS experiments are performed measuring the X-ray fluorescence yield by means of an ultra-fast MCP detector (Hamamatsu). Different acquisition modes are available: full XAS energy scan, fixed Energy-time delayed acquisitions.

Feature of the Laser Sources RegA9000 Mira HP Ti:Sa oscillator
Wavelenght 800nm; SHG: 400nm 800nm; SHG: 400nm
Pulse width 100 fs 100 fs
Pulse energy 5 μJ/pulse 25 nJ/pulse
Repetition rate 200-250 KHz 83.3 MHz

The experimental area around the branch C is flexible. User groups that wish to bring their own instruments or endstations to the beamline are encouraged to do so.
We invite users interested in installing  a bulky piece of equipment (such as an entire experimental station) which takes a long time to assemble and dismount to discuss their project with the beamline local contacts well in advance before the submission deadline in order to check the technical feasibility.
Elettra accepts a limited number of long term projects. These are allocations of beam time over a two-year period. The proposer has to explicitly declare that the instrumentation will be at Elettra for the whole time of the long term project and available to other users. For more info, please visit the user info section.

Ultima modifica il Mercoledì, 10 Marzo 2021 11:20