Broadband soft x-ray spectrometer

FIELD: physics.

SUBSTANCE: broadband soft X-ray spectrometer has a sealed housing in which there are detection channels, each having, arranged in series on the direction of radiation, an entrance slit, a selective filter, a region bounded by two total external reflection (TER) mirrors and an X-ray detector, wherein the detection channels are arranged quasi-parallel, wherein the TER mirrors are merged into one bundle by a common housing; the entrance slit is common for the whole bundle, and the X-ray detector used is a photographic recorder or a CCD matrix.

EFFECT: high spectral selectivity of the device, easier operation of the spectrometer owing to interdependent adjustment of the detection channels of the spectrometer on the radiation source, and compactness of the device and reduced weight and size due to fewer fastening elements.

3 cl, 5 dwg

 

The invention relates to a device for determining the spatial-spectral characteristics of x-ray radiation generated by the plasma formations, sources of x-rays with a wide spectral range, and can be used in scientific and applied problems, for example in the field of fusion research or in the development of x-ray sources for lithography systems, etc.

The known x-ray spectrometer [Patent RU 2177629, "x-ray Spectrometer", IPC: G01T 1/36, publ. 27.12.2001, authors: Salata F.G., Alas S.L., and others], which includes a composite body consisting of two parts, regional selective filters x-ray radiation, arranged in end-to-end cells and fixed presser plate, the registrars of x-ray radiation in the form of thermoluminescent detectors attached to the tubes. Presents the spectrometer is used for measuring the spectral characteristics or the spatial distribution of x-ray radiation in a given spectral region. Signal processing takes place through regional selective filter and detector.

The disadvantage of this device is the inability to determine the spatial brightness of the radiation source due to the lack of system reprojection image is supply and low spectral selectivity due to the presence in the signal detector contribution from quanta with energies above the window of the transmission edge of the filter.

The closest technical solution to the claimed device is a broadband spectrometer for soft x-rays [DMX: An absolutely calibrated time-resolved broadband soft x-ray spectrometer designed for class MJ laser-produced plasmas", J.L.Bourgade, B.Villette, J.L.Bocher and others, Review of scientific instruments, Vol.72, No.1, Jan 2001, p.1173-1182], which is selected as a prototype and includes a sealed housing, in which radially placed 12 recording channels, each of which consists of a collimating slit, the two mirrors of total external reflection (PVO), regional selective filter located in end-to-end cell before the mirrors, air defense, and Registrar of x-rays located at the channel output register. As Registrar of x-ray radiation is vacuum x-ray diode (WFD). The spectrometer is used to measure the spectral and temporal characteristics of x-ray radiation. The formation of an interim signal is provided by the WFD, and the division of radiation on the spectral components is performed by mirrors air and selective boundary filters.

The disadvantage of the prototype are:

- the impossibility of registration of the spatial brightness x-ray source due to the lack of schema reprojection image and use the WFD does not allow to record the spatial races is the definition;

- insufficient spectral selectivity of the channels from a single x-ray reflection from mirrors PVO;

- complexity in operation, requiring the settings of each channel register separately;

- high physical specifications.

Task - create a new design of the spectrometer to obtain information about the spectral brightness of the x-ray source at different spatial points in the range of energies of quanta from 0.05 Kev to 12 Kev with a one-dimensional spatial resolution.

The technical result is to provide opportunities for spatial-spectral characteristics of the fluorescence x-ray source.

Additional technical result is to increase the spectral selectivity of the device, ensuring easy operation of the spectrometer due to the interdependent alignment of the channels of the spectrometer for the radiation source; compactness and reduction in weight and size characteristics by reducing the number of fastening elements.

The technical result is achieved by the fact that broadband spectrometer for soft x-ray radiation includes a sealed housing in which are located the registration channels, each of which includes posledovatel is but placed in the direction of the radiation entrance slit, selective filter, a region bounded by two mirrors of total external reflection (AA), and the Registrar of x-ray radiation.

What's new is that the TV reception hosted quasiparallel, with mirrors air defense joint in the package body, an entrance slit is common for the whole package, and as Registrar of x-ray radiation using a photographic or CCD. In addition, the device may further comprise a zero channel reception, and a sealed enclosure can be attached to the camera interaction.

Placement of recording channels quasiparallel allows x-rays to experience multiple reflections in the area bounded by two mirrors, air defense, which increases the spectral selectivity of the channels; and only use one slot for reception of the one-dimensional spatial-spectral image.

Combining mirrors air defense in the package with the General body allows you to register a one-dimensional image of the x-ray source from one spatial position; reduces the dimensions of the design, ensuring easy operation due to the interdependent alignment channels.

Availability for the entire package of the shared entrance slit builds a one-dimensional image rentgenovskoj the source to the Registrar, provides ease of use and improves physical specifications.

Use as Registrar x-ray photographic or CCD allows you to register the spatial distribution of the spectral brightness of the source.

More supply device zero channel registration eliminates the need for additional systems for alignment, which reduces the weight and dimensions of the device.

Attaching the sealed enclosure to the camera interaction can improve usability by facilitating alignment of the device.

Design of broadband spectrometer for soft x-ray emission are presented in figure 1, where 1 is the x-ray source, 2 - x-ray radiation, 3 - input slot, 4 - holders selective boundary filters, 5 - regional selective filters, 6 - bundled mirror PVO, 7 - Registrar of x-ray radiation, 8 - zero channel registration, 9 - total housing 10 is sealed Cabinet, 11 - camera interaction, 12 - holder with progress.

Figure 2 shows the spectral characteristics of the channels of the device; figure 3 shows a model of complex laser-plasma source consisting of two plasma sources separated in space; figure 4 is given the resulting spectrogram using film brand UV-4; figure 5 presents the restored spectral brightness of the upper and lower x-ray sources.

In the presented implementation, the device includes a vacuum-sealed housing of cylindrical shape, made of stainless steel, which vacuumable attached to the camera interaction, in which there is an x-ray source. In a sealed enclosure located in the direction of the radiation entrance slit, consisting of two steel knives thickness of 200 μm and a gap of 20 μm between them; selective filters (including the boundary K-, L-type), glued on the filter holder, which, in turn, mounted on a common housing made of aluminum, which are collected in the package mirrors air defense, made of flat window glass made by hot spill on the surface of the molten tin; and the Registrar of x-ray radiation. Mirrors air defense are quasi parallel in a common housing required under a certain angle. For the simultaneous alignment of all mirrors PVO additionally used zero channel Desk, located in the package. Shared housing is attached to the sealed using a holder with progress. As Registrar of x-ray radiation using a cassette with x-ray film brand UV-4, with which p is to obtain the source image. The cartridge is attached using pressure plates to the output of the package. The package is placed inside a sealed enclosure attached to the holder with the progress that allows tilting of the package in two mutually perpendicular planes at angles up to 10 degrees.

The device operates as follows. The spectrometer is attached to the camera interaction 11 in which is located an x-ray source 1. The distance between the x-ray source 1, the entrance slit 3 and the Registrar of x-rays 7 are chosen in such a way as to provide the necessary spatial resolution. Mirror AA 6 arranged in a common housing 9 in such a way as to ensure the desired angles of incidence of x-rays 2 on them, for the implementation of spectral selection. In the General case 9 is zero, the channel registration 8 for subsequent alignment of the entire package mirrors air defense 6. Total housing 9 adjusted using the holder with openings 12 so that the x-ray quanta emitted from the Central region of the x-ray source 1 passing through the entrance slit 3 and reflected from the mirrors air defense 6, would fall in the Central region of the Registrar of x-ray radiation 7. The selection of the thicknesses of the filters 5, mounted on the holder 4, to achieve the required energy density d is genoscope radiation 2 in the Registrar of x-ray radiation 7 for each channel. When setting up the instrument and its alignment is completed, the lid of the sealed enclosure 10 is closed. In the case of use as a Registrar x-ray film 7, after the experiment the lid of the sealed enclosure 10 is opened, and change the film in the cassette. On the received signals with the Registrar of x-ray radiation 7 is based spatial-spectral dependence of the intensity distribution of the x-ray source 1.

Carrying out the design work and created the spectrometer. As a result of experimental studies have provided spatial and spectral characteristics of laser plasma, plasma Z-pinch and high x-ray tube. Measured spectral range is from 60 eV to 12 Kev. The spectral width of each channel is E/ΔΕ≈5. With the help of the device received the one-dimensional spatial image of the laser-plasma source with a resolution of 20 μm. Currently, the developed device has been successfully used in studies of plasma parameters and due to its compactness facilitates its use in a variety of applications.

1. Broadband spectrometer for soft x-ray radiation, comprising a sealed housing in which are located the registration channels, each of the C which includes sequentially placed in the direction of the radiation entrance slit, selective filter, a region bounded by two mirrors of total external reflection (AA), and the Registrar of x-ray radiation, characterized in that the channels are placed quasiparallel, with mirrors air defense joint in the package body, an entrance slit is common for the whole package, and as Registrar of x-ray radiation using a photographic or CCD.

2. Broadband spectrometer according to claim 1, wherein is further provided with a zero channel registration.

3. Broadband spectrometer according to claim 1, wherein the sealed enclosure is attached to the camera interaction.



 

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