Glossary: CEX, SEE (ECP-WarpX#4325)

* Glossary: CEX, SEE

Add new terms to our glossary for charge-exchange collisions
and secondary electron emission.

* plural collisions

Co-authored-by: Revathi  Jambunathan <[email protected]>

---------

Co-authored-by: Revathi  Jambunathan <[email protected]>

Docs/source/glossary.rst

@@ -18,6 +18,7 @@ Abbreviations
 * **BC:** boundary condition (of a simulation)
 * **BCK:** `Benkler-Chavannes-Kuster <https://ieeexplore.ieee.org/document/1638381>`__ method, a stabilization technique for small cells in the electromagnetic solver
 * **BTD:** backtransformed diagnosics, a method to collect data for analysis from a *boosted frame* simulation
+* **CEX:** charge-exchange collisions
 * **CFL:** the Courant-Friedrichs-Lewy condition, a numerical parameter for the numerical convergence of PDE solvers
 * **CI:** continuous integration, automated tests that we perform before a proposed code-change is accepted; see PR
 * **CPU:** `central processing unit <https://en.wikipedia.org/wiki/Central_processing_unit>`__, we usual mean a socket or generally the host-side of a computer (compared to the accelerator, e.g. GPU)
@@ -57,6 +58,7 @@ Abbreviations
 * **RPA:** radiation-pressure acceleration (of protons/ions), e.g. hole-boring (HB) or light-sail (LS) acceleration
 * **RZ:** for the coordinate system ``r-z`` in cylindrical geometry; we use "RZ" when we refer to quasi-cylindrical geometry, decomposed in azimuthal modes (see details `here <https://fbpic.github.io/overview/pic_algorithm.html#cylindrical-grid-with-azimuthal-decomposition>`__)
 * **SENSEI:** `Scalable in situ analysis and visualization <https://sensei-insitu.org/>`__, light weight framework for in situ data analysis offering access to multiple visualization and analysis backends
+* **SEE:** secondary electron emission
 * **TNSA:** target-normal sheet acceleration (of protons/ions)
 
 Terms