|At least 2 months before:
You can request sample holders to be shipped to your home institution ahead of time; contact beamline staff and provide a FedEx number.
ARPES: Please contact staff ASAP to discuss sample preparation. At the moment, our chamber only offers the following capabilities:
RSXS: The current set-up uses a kappa geometry with a horizontal scattering plane. Note that a very limited number of diffraction peaks can be accessed in the soft x-ray range (E<3keV). This coupled with the fact that conversion to the standard 4-C nomenclature (phi, chi, theta and 2theta) is non-intuitive makes experimental planning crucial. Please consider pre-aligning your sample to speed-up alignement, and contact staff if to make sure the q-range you want to study is accessible.
ARPES: Proper cooling is critical for the success of soft x-ray ARPES experiment because of the destructive effect of electron-phonon scattering on the coherent ARPES signal (see https://www.nature.com/articles/nmat3089). LN2 is provided free of charge but LHe cost is the users' responsibility. If you are unsure about the temperature required to perform ARPES measurement on your samples, we recommend setting-up an account anyway, in case LHe turns out to be necessary
RSXS: The RSXS endstation is equipped with a close cycle cryostat so no cryogens are required. If you are planning to measure at low temperature please notify beamline staff so that we can start the compressor ahead of time (~8 hours to cool down from room temperature).
The experimental safety assessment form (ESAF) purpose is to identify the hazards associated to your experiment; it must be submitted at least 2 weeks before your experiment.
Make sure to review all the questions below the material information table, and check “Yes” in the appropriate boxes. If you will be mounting your samples at the beamline, reply "yes" to the question:
In the “Lab Use” tab, please include the following statement:
We will use the Sector 29 laminar flow room ("clean room") to prepare samples. Samples will be handled with gloves and tweezers. In addition, this work may involve UHV cleaning with incidental quantities of ethanol and acetone. Sample will be mounted to the sample holders using silver epoxy, silver paste or Torr Seal; the Sector 29 hot plate may be used for curing. Alternatively, samples will be secured to the sample plate by spot-welding Ta clips.
There are no chemical fume hood or glove box available at the beamline. If you need one to prepare your sample, please contact beamline staff at least 3 weeks ahead of your experiment so we can arrange with another sector.
ARPES: In the “Description” Tab, please include the following statement(s) if relevant to your experiment:
After loading samples in the chamber, we will perform an in-vacuum annealing at (specify your temperature here - max T = 800C).
Liquid nitrogen or liquid helium may be used for measurements at cryogenic temperatures; appropriate PPE will be used for handling cryogenic equipment (cryo gloves, face shield, safety glasses, cryo apron).
If you don't have a user badge or if your user badge has expired, please make sure to notify the user office of your arrival by checking-in on the APS User Portal; by doing so, a gate pass will be requested on your behalf. Remember to bring your ID and immigration documents (even if you have a badge).
Access to the Argonne National Lab is extremely restricted: failure to check in and/or present appropriate documentation can lead to hours long wait or even access denial.
Finally, please make sure to completed your trainings before coming to the beamline; this included Sector 29 orientation . Note that any missing training might delay your experiment since no work (including mounting samples) will be allowed until all experimenters have completed their required training.
Upon arriving, make sure to stop by the APS user office during business hours (M-F, 8am-5pm) to get your badge activated.