March 23, 2015 Background Would like to have a uniform E field (at - PowerPoint PPT Presentation

LZ Weekly Meeting March 23, 2015

Background • Would like to have a uniform E field (at least in direction). • Field shaping rings are meant to accomplish this, but despite the rings, the field in LUX still became distorted. • Possible solution: make rings smaller to expose metal to the interior. • Possible problem: rings are not as reflective as the teflon, so we will lose sensitivity. • How much?

Method • Simulate Wimp interactions (using Wimp Generator which seems to put the Xenon into an excited state) • Tracking Information for one such event – http://agenda.hep.wisc.edu//getFile.py/access?co ntribId=1&resId=1&materialId=slides&confId=837

• First time there was weird stuff going on. Found the missing events About 8500 events in the -200 to 0 region in 2 spikes. Not entirely sure why yet, but think it’s because there are tons of mini volumes that are part of the LiquidXenon. Guess is it tries to populate them evenly regardless of size. (Pg 681 of the tracking (trace))

Activity ratios • Total activity in the entire simulation = 0.035 Bq – Activity ratio for InnerLiquidXenon = 0.142857 – Activity ratio for LiquidXenonTarget = 0.142857 – Activity ratio for InnerLiquidXenonCathodeGridHolder_Subvolume_1 = 0.142857 – Activity ratio for InnerLiquidXenonCathodeGridHolder_Subvolume_2 = 0.142857 – Activity ratio for InnerLiquidXenonCathodeGridHolder_Subvolume_3 = 0.142857 – Activity ratio for InnerLiquidXenonCathodeGridHolder_Subvolume_4 = 0.142857 – Activity ratio for InnerLiquidXenonBottomGridHolder = 0.142857 • Link to the tracking information from this run: – http://agenda.hep.wisc.edu//getFile.py/access?contribId=1&resId=0& materialId=slides&confId=837

Tried using just LiquidXenonTarget this time, (I think it contains the entire fiducial volume). Can see that the volume events are being generated in seems to be the liquid Xenon as expected. (All 10,000 events present and accounted for this time!) Geometry as revealed by Geantino. | | V X (mm) Y (mm) Z(mm)

And the Z direction… X (mm) Y (mm) Z(mm)