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--- technical:mtr2 [2024/12/20 14:04] – bgelly
+++ technical:mtr2 [2025/01/17 15:39] (current) – etienne
@@ Line 1: / Line 1: @@
-===== MTR2 =====
+===== THEMIS MulTi-Ray spectrograph (MTR2) =====
-{{ :technical:spectro_synoptic.png?600|}}
+MTR2 is the advanced version of the original MulTi-Ray spectrograph of THEMIS. MTR2 enables the production of high-spectral resolution spectrograms simultaneously in different wavelengths. This enables the study of different physical properties of the distinct layers of the solar atmosphere.
-== Schematics of the MTR2 ==
-The MTR2 is made of a predispersor ("SP1" first one on the left part), forming a lowres spectrum on the wavelength selector (so called the "mask plate"). From there , only the selected bandwith travel to the highres echelle spectrograph (right part), ending  over the MTR cameras at the SP2 output.\\
+<columns 100% 60%>
+==== Schematics of MTR2 ====
+MTR2 is made of a predispersor ("SP1" first one on the left part), forming a low resolution spectrum on the wavelength selector (so called the "mask plate"). From there, only the selected bandwiths travel to the high-resolution echelle spectrograph (right part), ending  over the MTR cameras at the SP2 output (one bandwith per camera).\\
 The optical layout along Y is fixed (no changes, never). The ruling of the gratings are **along Y** only and the dispersion of both spectra is **along Z** only. The entrance slit is fixed (but for its width), and such are the collimators and camera mirrors.
 The moving parts are:
-  * Predisperser gratings selection table (EM35) . There are 3 selectable predispersers, although only one (the central slot) is used for MTR operation.
+  * The predisperser gratings selection table (EM35). There are 3 selectable predispersers, although only one (the central slot) is mainly used for MTR2 operation.
-  * Predisperser can rotate about the Y axis to change the grating incidence angle a (EM37). This allows shifting  the low res spectrum along Z over the masks stop plate.
+  * PThe predisperser rotates about the Y axis to change its grating incidence angle (EM37). This allows shifting  the lowres spectrum along Z over the masks stop plate.
-  * The mask plate can translate in the  Z direction (EM39)
+  * The mask plate translates in the  Z direction (EM39)
-  *  The echelle grating can rotate about the Y axis to change its grating incidence angle a (EM37). This allows shifting the highres spectrum along Z at the SP2 output.
+  *  The echelle grating rotates about the Y axis to change its grating incidence angle a (EM32). This allows shifting the highres spectrum along Z at the SP2 output.
-  * Legacy “DPSM engage” mirror (EM71, "out" in normal operation.
+  * The legacy “DPSM engage” mirror (EM71, "out" in normal operation.
-  * Each of the 4 spectrograph mirrors has a shutter (EM50 to EM53)
+  * Each of the 4 spectrograph mirrors has a mechanical shutter (EM50 to EM53)
 In short:
-  # The main optical layout (F2 to SP2) is static and doesnot require changes for daily operation.
+    - The main optical layout (F2 to SP2) is static and does not require changes for daily operation.
-  # Spectral confguration of the multiline is obtained using:
+    - Spectral configuration of the multi-line is obtained using:
-     * both gratings rotation
+       * both gratings rotation
-     * masks plate tuning in translation
+       * masks plate tuning in translation
-     * manual setup of the spectral cameras at the SP2 output
+       * manual setup of the spectral cameras at the SP2 output
+Data and formulae for the MTR2 can be found in the following document: \\
+ [[this>wdata/WSpectroTools/Spectro_Formulae.pdf | THEMIS spectrograph (auth: CLM)]]
+==== Spectrograph simulation tools  ====
+These tools allow the observer to quick check the feasibility of a setup
+  * [[this>wdata/Instrument/tools/Rep1/MtrSim.html | MTR spectrograph simulator]] (java web version / auth: CLM)
+  * [[this>wdata/WSpectroTools/MTR_Calculator.xls | MTR spectrograph simulator]] (Downloadable excel version / auth: CLM)\\ Please enable macros to get a correct result.
+Observers can also check the  [[technical:mtr2:maskplates| list of existing available mask plates]] to have an idea of readily available combination.
+==== Solar spectra resources ====
+  * [[this>wdata/WSpectralRes/solar_spect.pdf | Solar spectrum ]] (3800 to 8700 Å with identified lines)
+  * [[this>wdata/WSpectralRes/nbsmonograph61.pdf | Solar lines]] (2935 to 8770 Å, **Moore & Minaert (M&M)**, NIST)
+  * [[http://bass2000.obspm.fr/solar_spect.php|Solar spectrum]] (**BASS2000** interactive plot)
+  * [[http://www.astrosurf.com/spectrohelio/atlas-en.php|Solar spectrum]] (**Astrosurf**:  interactive 2d with M&M identification)
+<newcolumn *40%*>
+<html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:schema:spectro_synoptic.png"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:schema:spectro_synoptic.png" style="width:90%; height: auto;"></a></html>
+<html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:instrumentation:wp_20191108_16_20_40_pro_-_copy.jpg"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:instrumentation:wp_20191108_16_20_40_pro_-_copy.jpg" style="width:90%; height: auto;"></a></html>
+<html> <a href="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:instrumentation:spectro_with_light.png"><img src="https://www.themis.iac.es/lib/exe/fetch.php?media=:results:gallery:instrumentation:spectro_with_light.png" style="width:90%; height: auto;"></a></html>
+</columns>