[Neutron] ORNL 2017-A neutron scattering proposal call: updated information for the quantum condensed matter user program at the HFIR

[Aczel, Adam A.]

Dear Quantum Condensed Matter Users of the HFIR at ORNL:

As the deadline approaches for the next neutron scattering proposal call at ORNL, here are some quick updates about the user program for quantum condensed matter science at the High Flux Isotope Reactor (HFIR):

1. Additional beamtime available at HFIR for proposal call 2017-A:
We are pleased to announce that HFIR will run for four cycles in the 2017-A beam period rather than the three cycle standard that has been in place for the last several proposal calls.

2. Transportation between HFIR and the ORNL guest house:
Note that it takes 10 - 15 minutes to drive between the HFIR site and the ORNL guest house. ORNL offers a taxi service between the two locations, but the taxis only run on weekdays between 8 AM - 4 PM. Therefore, it is highly desirable for at least one member of your experimental team to arrive at ORNL with a car. If this is not possible, please let your local contact know in advance so other transportation arrangements can be made.

3. Neutron alignment station:
If you need to align a single crystal for an ORNL neutron scattering experiment, please contact Lou Santodonato (santodonatol at ornl.gov<mailto:santodonatol at ornl.gov>) or your local contact well in advance of your experiment, so alignment time can be reserved for you on CG-1B. Note that we have a first come, first served scheduling system for this instrument. Also, let Lou or your local contact know if you are experienced with sample alignments or if you will require significant assistance.

4. IPTS is now open to accept proposals for cycle 2017-A, with an Oct. 5 deadline at noon:  http://www.ornl.gov/sci/iums/ipts/

5. Instruments used for quantum condensed matter science at HFIR include:
(i) HB-1A: fixed incident energy thermal triple axis spectrometer. Excellent signal-to-noise ratio and large Q-coverage makes this instrument ideal for magnetic diffraction studies of small single crystals (mass > 5 mg) and thin films at a variety of different temperatures (0.03 K - 1800 K), magnetic fields (0 - 8 T), and applied pressures.  For more information, please contact Wei Tian (tianwn at ornl.gov<mailto:tianwn at ornl.gov>) or Adam Aczel (aczelaa at ornl.gov<mailto:aczelaa at ornl.gov>).

(ii) HB-1: polarized thermal triple axis spectrometer. This instrument is specifically designed for polarized beam measurements, but also highly efficient for general purpose unpolarized neutron scattering experiments. These measurements can be done at a variety of different temperatures (0.03 K - 1800 K) and magnetic fields (0 - 8 T). For more information, please contact Masaaki Matsuda (matsudam at ornl.gov<mailto:matsudam at ornl.gov>) or Daniel Pajerowski (pajerowskidm at ornl.gov<mailto:pajerowskidm at ornl.gov>).

(iii) HB-2A: neutron powder diffractometer. This instrument is used for crystal and magnetic structure studies of powder and ceramic samples at a variety of different temperatures (0.03 K - 1800 K), magnetic fields (0 - 6 T), and applied pressures up to 2 GPa. For more information, please contact Clarina de la Cruz (delacruzcr at ornl.gov<mailto:delacruzcr at ornl.gov>) or Stuart Calder (caldersa at ornl.gov<mailto:caldersa at ornl.gov>).

(iv) HB-2C: wide-angle neutron diffractometer (WAND). This instrument is used for measurements of medium-resolution powder diffraction patterns. Its high flux allows fast data sampling and makes it useful in studies of kinetics in phase transitions. Additionally, the 1-dimensional linear position sensitive detector allows the mapping of reciprocal space, making WAND useful to search for fundamental magnetic propagation vectors or measurements of diffuse scattering in single crystals. These measurements can be done at a variety of different temperatures (0.3 K - 1800 K), magnetic fields (0 - 5 T) and pressures up to 2 GPa. For more information, please contact Matthias Frontzek (frontzekmd at ornl.gov<mailto:frontzekmd at ornl.gov>).

(v) HB-3: general purpose thermal triple axis spectrometer. This instrument is our most intense triple axis spectrometer and is designed for inelastic measurements on single crystals over a wide range of energy and momentum transfers. These measurements can be done at a variety of different temperatures (0.03 K - 1800 K) and magnetic fields (0 - 8 T). For more information, please contact Songxue Chi (chis at ornl.gov<mailto:chis at ornl.gov>) or Daniel Pajerowski (pajerowskidm at ornl.gov<mailto:pajerowskidm at ornl.gov>).

(vi) HB-3A: four-circle single crystal diffractometer. This instrument is equipped with a two-dimensional area detector. It is used for single crystal diffraction measurements (both structural and magnetic) over a temperature range 4 - 800 K. Additional sample environment options include high pressures up to 2 GPa, electric fields (voltages up to 1100 V), and magnetic fields up to 1 T. For more information, please contact Huibo Cao (caoh at ornl.gov<mailto:caoh at ornl.gov>), Matthias Frontzek (frontzekmd at ornl.gov<mailto:frontzekmd at ornl.gov>), or Bryan Chakoumakos (chakoumakobc at ornl.gov<mailto:chakoumakobc at ornl.gov>).

(vii) CG-4C: cold triple axis spectrometer. This instrument is designed for inelastic measurements on single crystals, where low energy transfers between -2 to 5 meV are necessary. These measurements can be done at a variety of different temperatures (0.03 K - 1800 K) and magnetic fields (0 - 11 T). The instrument analyzer has fixed vertical focusing, while the geometry in the horizontal direction can be either flat or focused. This option allows one to have the flexibility of sacrificing Q-resolution for additional intensity. For more information, please contact Tao Hong (hongt at ornl.gov<mailto:hongt at ornl.gov>) or Adam Aczel (aczelaa at ornl.gov<mailto:aczelaa at ornl.gov>).

(viii) GP-SANS: general-purpose small angle neutron scattering diffractometer. This instrument is used to probe magnetic structures on the order of 0.5 nm to 200 nm length scales (q = 0.0007 Å-1 to about 1 Å-1).  These measurements can be done at a variety of different temperatures (0.03 K - 1300 K), and vertical or horizontal fields up to 8 and 11 T respectively can be applied. For more information, please contact Lisa DeBeer-Schmitt (debeerschmlm at ornl.gov<mailto:debeerschmlm at ornl.gov>).

More details for all of these instruments can be found at the following link:
http://neutrons.ornl.gov/instruments/

We look forward to receiving your neutron proposals this fall, before the Oct. 5 deadline.

Regards,
Your instrument team at the HFIR for quantum condensed matter science

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