From 8d564b40cd0f38022a1325e5dc9c8caaa4303f20 Mon Sep 17 00:00:00 2001
From: Jose Borreguero <borreguero@gmail.com>
Date: Wed, 24 Mar 2021 14:19:47 -0400
Subject: [PATCH] Refs #30887 requires sign flip!
Signed-off-by: Jose Borreguero <borreguero@gmail.com>
---
Framework/PythonInterface/plugins/algorithms/SaveHKLCW.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Framework/PythonInterface/plugins/algorithms/SaveHKLCW.py b/Framework/PythonInterface/plugins/algorithms/SaveHKLCW.py
index 94e8edb4b9e..62453bc4be8 100644
--- a/Framework/PythonInterface/plugins/algorithms/SaveHKLCW.py
+++ b/Framework/PythonInterface/plugins/algorithms/SaveHKLCW.py
@@ -80,7 +80,7 @@ class SaveHKLCW(PythonAlgorithm):
R = p.getGoniometerMatrix()
RU = np.dot(R, U)
ki = ki_n * (2 * np.pi / p.getWavelength())
- kf_n = ki + p.getQLabFrame() # direction of scattered wavevector
+ kf_n = ki - p.getQLabFrame() # direction of scattered wavevector
kf_n = kf_n * (1. / kf_n.norm())
dir_cos_1 = np.dot(RU.T, -ki_n) # notice ki direction is reversed
dir_cos_2 = np.dot(RU.T, kf_n)
--
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