Overall, our plans have not changed (three instruments), but our schedule is likely slowed down due to COVID

Four-channel Ross-filtered soft x-ray detector (PMT/phosphor)

Thin filter transmission will be used to select different x-ray energy bands. We are presuming a

1 keV central electron temperature in FuZE

Two vacuum flanges for FuZE after cleaning. A total of eight ports, all viewing the same region of plasma.

The x-ray imager and EUV spectrometer will mount on the big 4.5” ports, the four PMT detectors will go on the 2.75” angled ports, and the two smallest ports will simply have windows for visible spectroscopy.

Three Phosphor screens. The middle one is for imaging. The two angled ones for the PMT’s

Two PMT’s per side, in copper shielding housingsPumpout bypass lines protect the thin foils. The black spacers are ceramic breaks.

Looking from the vacuum side, before mounting the pinhole cone for imaging

200 million frame/second Hadland imagerSimple x-ray pinhole snout, with converter phosphor coated onto a Conflat window

Example: 12 frame sequence, end on view of an FRC plasma at LANL

For the FuZE version, we are milling down our cone base to fit into the 4.5”flange phosphor window, where it will be held in place with an indium gasket. We are planning to start with a 100 um diameter pinhole, which is a compromise between sufficient light collection and desired spatial resolution in a 2:1 pinhole camera setup.

UNR efforts on the EUV spectrometer have not begun in the laboratory, yet.

McPherson Model 310G spectrometer

Entrance slit

Glass capillary

Pump port

MCP housing6-strip MCP with fiber optic taper (3:1)

Relay lenses (50 mm Nikkor f/1.2)

1024x1024 pixel 16-bit CCD

Figure 2. The UNR McPherson Model 310G spectrometer equipped with a lens-coupled MCP/CCD detector.

Grating Groove D. Blaze Ang. Blaze Wl. Low High[g/mm] [nm] [degree] [nm] [nm] [nm]133.6* 7485 2 45.53 30.36 68.30600* 1667 2 10.14 6.76 15.211200 833 2 5.07 3.38 7.60

2400* 417 2 2.53 1.69 3.803600 278 1 0.68 0.45 1.01

Table 2. The McPherson Model 310G accommodates aselection of gratings. The most sensitive spectral range (2/3-3/2-rule) is shown for the gratings available. The133.6 g/mm, 600 g/mm, and 2400 g/mm gratings are on-handat UNR, and are indicated in the table by an asterisk.

BETHE project update for LANL and UNR • Technically, this project began on July 1,

2020• No charges have been incurred to it, either

from LANL or UNR• However, in order to kick-start the planning

and design effort with our German partners, we did hold a series of Zoom meetings, to outline deliverables, responsibilities, and a schedule, for the 4.5 million frame/second X-ray camera from X-Spectrum in Hamburg, Germany.

• CAD Drawing files have been exchanged, and an interface flange from FuZE to the camera (on a big 8” conflat) has been sketched up.