From c180a698913c15cc24e58ba18425da42847c2bb0 Mon Sep 17 00:00:00 2001 From: arrell_c Date: Wed, 21 Feb 2024 10:57:23 +0100 Subject: [PATCH] Update Spectral data --- Aramis-spectral-diagnostics/Spectral-data.md | 50 +++++++++++++------- 1 file changed, 34 insertions(+), 16 deletions(-) diff --git a/Aramis-spectral-diagnostics/Spectral-data.md b/Aramis-spectral-diagnostics/Spectral-data.md index 4bd5e38..d949fee 100644 --- a/Aramis-spectral-diagnostics/Spectral-data.md +++ b/Aramis-spectral-diagnostics/Spectral-data.md @@ -1,30 +1,32 @@ ## Channel list + All PSSS data channels are listed in the following sheet: [Sheet of PSSS data channels](https://docs.google.com/spreadsheets/d/16Hz7MZR3E7-OmLHfakkT2K6yPMFUzp4eIFZxrzXWjFk/edit?usp=sharing) ## Nomenclature -| Style | Meaning| -|----------|----------| -| SARFE10-PSSS059:**SPECTRUM***|Raw spectral data | -| SARFE10-PSSS059:**FIT*** | Results of Gaussian fit | -| SARFE10-PSSS059:**SPECT*** | Statistics from the raw (without fit) spectrum | -| SARFE10-PSSS059:**AVG*** | Data calculated from average (not single shot) spectra | +| Style | Meaning | +|-------|---------| +| SARFE10-PSSS059:**SPECTRUM**\* | Raw spectral data | +| SARFE10-PSSS059:**FIT**\* | Results of Gaussian fit | +| SARFE10-PSSS059:**SPECT**\* | Statistics from the raw (without fit) spectrum | +| SARFE10-PSSS059:**AVG**\* | Data calculated from average (not single shot) spectra | ## Concepts + **Width and center** -Spectral width and central energy are calculated by both a Gaussian fit and directly from the spectra. Depending on the spectral intensity profile, the Gaussian may return a poor representation of the spectra, for example for a spectral with a long tail. Before both fitting and calculation the spiky single shot spectra are smoothed with a savgol filter: +Spectral width and central energy are calculated by both a Gaussian fit and directly from the spectra. Depending on the spectral intensity profile, the Gaussian may return a poor representation of the spectra, for example for a spectral with a long tail. Before both fitting and calculation the spiky single shot spectra are smoothed with a savgol filter: -``` +```plaintext # smooth the spectrum with savgol filter with 51 window size and 3rd order polynomial smoothed_spectrum = scipy.signal.savgol_filter(spectrum, 51, 3) ``` The standard deviation and center of mass for the spectra are calculated as: -``` +```plaintext smoothed_spectrum_normed = smoothed_spectrum / np.sum(smoothed_spectrum) spectrum_com = np.sum(axis * smoothed_spectrum_normed) spectrum_std = np.sqrt(np.sum((axis - spectrum_com) ** 2 * smoothed_spectrum_normed)) @@ -32,7 +34,7 @@ spectrum_std = np.sqrt(np.sum((axis - spectrum_com) ** 2 * smoothed_spectrum_nor **Relative energy spread** -Channels ending in **RES** are a measure of the relative energy spread in units of ‰. For **FIT** data the relative energy spread is calculated as: +Channels ending in **RES** are a measure of the relative energy spread in units of ‰. For **FIT** data the relative energy spread is calculated as: $`\frac{2.355*\sigma}{\mu}`$ @@ -42,12 +44,26 @@ $`\frac{2.355*RMS}{\text{Center of mass}}`$ where the factor or 2.355 is included to allow these values to be comparable. +**Spectral brightness** + +To quantify an increase in the spectral intensity in a narrowing bandwidth the so called Spectral brightness is calculated: + +$`\text{Spectral brightness} = \frac{\text{Single shot intensity [uJ]}}{\text{Single shot spectral FWHM [eV]}}`$ + +At Aramis the current channel used for the single shot pulse intensity is: +`SARFE10-PBPG050:FAST-PULSE-ENERGY` + +and the spectral FWHM uses the single shot spectral width. The result channel name is: +`:FIT-BRT` +indicating the data uses a Gaussian fit. Beware this data is only meaningful if the spectral intensity distribution is near Gaussian. + ## Data flow schematic - + +![](https://docs.google.com/drawings/d/e/2PACX-1vRShOtDRMpQTAY1p5oZKvRcuyLToMvmgzTQHOS_JrdQArvqcul-RoMcIobmKFc8RPgJVjGzULKczS5-/pub?w=1440&h=1080) ## CamServer setup -The PSSS has a dedicated server - sf-daqsync-11.psi.ch +The PSSS has a dedicated server - sf-daqsync-11.psi.ch ### Store pipeline @@ -56,7 +72,8 @@ The PSSS has a dedicated server - sf-daqsync-11.psi.ch This pipeline sends the camera image directly to the image buffer -**Channels** +**Channels** + - SARFE10-PSSS059:FPICTURE ### PSSS pipeline @@ -64,9 +81,10 @@ This pipeline sends the camera image directly to the image buffer - SARFE10-PSSS059_psss - 13 clients -This pipeline extracts the spectra, fits and produces the statistics +This pipeline extracts the spectra, fits and produces the statistics + +**Channels** -**Channels** - SARFE10-PSSS059:FIT-BRT - SARFE10-PSSS059:FIT-COM - SARFE10-PSSS059:FIT-FWHM @@ -78,4 +96,4 @@ This pipeline extracts the spectra, fits and produces the statistics - SARFE10-PSSS059:SPECTRUM_X - SARFE10-PSSS059:SPECTRUM_Y - SARFE10-PSSS059:SPECTRUM_Y_SUM -- SARFE10-PSSS059:processing_parameters +- SARFE10-PSSS059:processing_parameters \ No newline at end of file