diff --git a/init/README.md b/init/README.md
index 4cbb8dcc3e03874fbdd109b4c2e76165b824cd52..420be845607cfc7027d3bbbb4c94c67d26b16f45 100644
--- a/init/README.md
+++ b/init/README.md
@@ -6,3 +6,6 @@ Init
 
 # accelerator-operation-ess.json
 * The accelerator operation enumeration (not included into the databuffer)
+
+# mevts-ess.json
+* Master events according to: ESS-1837307: Time Structure of the Proton Beam Pulses in the LINAC.
diff --git a/init/mevts-ess.json b/init/mevts-ess.json
new file mode 100644
index 0000000000000000000000000000000000000000..68c9809633e108b6a530e717a691d15cc1862716
--- /dev/null
+++ b/init/mevts-ess.json
@@ -0,0 +1,63 @@
+{
+  "doc": "ESS-1837307",
+  "MEVT1": {
+    "LEBTC_ST": {
+      "id": 6
+    }
+  },
+  "MEVT2": {
+    "LEBTC_END": {
+      "id": 7
+    }
+  },
+  "MEVT3": {
+    "MEBTC_ST": {
+      "id": 8
+    }
+  },
+  "MEVT4": {
+    "MEBTC_END": {
+      "id": 9
+    }
+  },
+  "MEVT5": {
+    "IONMAG_ST": {
+      "id": 10
+    }
+  },
+  "MEVT6": {
+    "IONMAG_END": {
+      "id": 11
+    }
+  },
+  "MEVT7": {
+    "BPULSE_ST": {
+      "id": 12
+    }
+  },
+  "MEVT8": {
+    "BPULSE_END": {
+      "id": 13
+    }
+  },
+  "MEVT9": {
+    "14HZ": {
+      "id": 14
+    }
+  },
+  "MEVT10": {
+    "BPULSE_CM": {
+      "id": 15
+    }
+  },
+  "MEVT11": {
+    "DATA": {
+      "id": 16
+    }
+  },
+  "MEVT12": {
+    "DATAS": {
+      "id": 17
+    }
+  }
+}