TXI Layout & Specifications
Functional Layout
Download high-res PDF drawing of NEH 1.2 functional layout
TXI, the NEH 1.2 instrument, will be configured to operate on both the soft X-ray undulator (SXU) and the hard X-ray undulator (HXU) sources with the following configuration requirements:
- Fixed X-ray beam trajectories
- Ability to focus the two sources simultaneously into a single micron diameter interaction point where the experimental endstation will be positioned.
- Ability to efficiently change experimental endstations.
X-ray Requirements
- Focusing: KB mirrors with 2 stripes (Nickel and Boron Carbide)
- 1.5 μm in vertical
- 0.8 μm in horizontal
- KB's can be removed for unfocused operation or Zone plate operation
- Photon Energy Range:
- Soft X-ray Undulator Branch Line
- 250 eV to 5 keV
- Harmonic Rejection between 1.4 and 5 keV
- Hard X-ray Branch Line
- 1 keV to 7 keV
- Harmonic Rejection between 2.2 and 7 keV
- Soft X-ray Undulator Branch Line
- Allows both copper and superconducting accelerator operations
- Allows simultaneous undulator operations for X-ray pump and X-ray probe operations
- Beamline transmission 60 to 90% depending on operation mode
- Repetition rate: up to 929 kHz (including 120 Hz Cu operations)
Beamline Specifications
Parameter | Required | Goal | Comment |
|---|---|---|---|
Photon Energy Range SXU [eV] | 1250-5000 1750-7000 | 250-5000 1000-7000 | Need to reject harmonics outside of required range |
ΔE / E SXU | SASE SASE | 1 x 10-3 1 x 10-4 | Desired Seeded on SXU and delay line will double as monochromator on HXU |
Beamline Transmission [%] | 50 | 90/70 | B4C / Ni respectively |
Max FEL Power [W] | 200 |
|
|
Experimental Spot Size Range a. Horizontal [μm] b. Vertical [μm] | a. 1-10 | a. <1-10 | Finite bendable KB mirrors for both SXU and HXU beams |
Beam Position Stability | <10 |
| Required for overlap of SXU and HXU beams |
