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Experiments/RunAwayElectronStudies/Physics/Sessions/Pb_shielding_first_attempt_2019_04_02
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format: markdown
title: Pb shielding of NaITl detector - first attempt (2. 4. 2019)
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#**Aim of experiment**
* first test of shielding of scintillation detector to reduce flux of HXR radiation
* attempt to build a proper shielding in order to be possible reduce a flux of radiation and detect single photons and not burst of radiation
* reduction of flux of radiation approaching a detector is needed to make a proper spectra of HXR radiation, which is produced by RE in GOLEM tokamak
#**Short description**
* present: J. Čeřovský, A. Kolínská, O. Ficker, V, Svoboda
* led bricks were borrow from COMPASS
* several shielding "bunkers" were build and influence on detection of HXR radiation was observed
* standard NaITl scintillation detector was used
#**Experimental setting**
* standard plasma diagnostics
* **RE related diagnostics:** NaITl ($U_{PS} = 550 \ \mathrm{V}$)
#**Logbook**
| Shot | $U_{CD} \ [\mathrm{V}]$ | $U_{BT} \ [\mathrm{V}]$ | $t_{d} \ [\mathrm{ms}]$ | $p_{wg} \ \mathrm{mPa}$ | $t_{p} \ \mathrm{ms}$ | Type of shielding | Note |
|:---------:|:-----------------------:|:-----------------------:|:-----------------------:|:-----------------------:|:---------------------:|:----------------------------------------------------------------------------------------:|:-------------------------------------------------------------------------------:|
| 30187 | 500 | 1000 | 0 | 13 | 12.0 | above bunker (bunker on the ground) | no HXR signal |
| 30188 | 500 | 1000 | 0 | 13 | 13.4 | above bunker (bunker on the ground) | no HXR signal - data aquissition cable connected to trigger not to osciloscope |
| 30189 | 500 | 1000 | 0 | 13 | 14.5 | above bunker (bunker above ground) | HXR signal |
| 30190 | 500 | 1000 | 0 | 13 | 13.1 | in bunker (bunker above ground) | no HXR signal |
| 30191 | 500 | 1000 | 0 | 13 | 13.2 | - | no HXR signal |
| 30192 | 500 | 1000 | 0 | 13 | 13.0 | above bunker (bunker on the ground) | some HXR signal |
| 30193 | 500 | 1000 | 0 | 13 | 13.8 | need to be add! | need to be add! |
| 30194 | 450 | 1000 | 0 | 13 | 12.9 | need to be add! | need to be add! |
| 30195 | 450 | 1300 | 0 | 13 | 14.7 | need to ne add! | need to be add! |
| 30196 | 450 | 1300 | 0 | 13 | 15 | need to be add! | need to be add! |
| 30197 | 450 | 1300 | 0 | 13 | 14.7 | only led cylinder (on the ground) | some HXR peaks - not many |
| 30198 | 450 | 1300 | 0 | 13 | 15.5 | bottom part of led cylinder only (on the ground still) | much more peaks than in previous configuration as expected |
| 30199 | 450 | 1300 | 0 | 13 | 15.5 | only led cylinder, but placed on the table | higher signal then on the ground |
| 30200 | 450 | 1300 | 0 | 13 | 15.9 | led cylinder + one line of led bricks from sides and front | flux of radiation reduces |
| 30201 | 450 | 1300 | 0 | 13 | 16.1 | led cylinder + one line of led bricks from sides and front with small gap | greater flux of radiation then previous (as expected) |
| 30202 | 450 | 1300 | 0 | 13 | 15 | previous but without gap | almost negligible HXR signal |
| 30203 | 450 | 1300 | 0 | 13 | 15.9 | gap 4.1 mm | |
| 30204 | 450 | 1300 | 0 | 13 | 15.6 | gap 4.1 mm | |
| 30205 | 450 | 1300 | 0 | 13 | 19.3 | gap 7.5 mm | |
| 30206 | 450 | 1300 | 0 | 13 | 15.9 | gap 7.5 mm + bricks placed more closely to each other + additional small brick above gap | |
| 30207 | 450 | 1300 | 0 | 13 | 19.5 | same as previous | |
| 30208 | 450 | 1300 | 0 | 13 | 19.8 | same as previous | |
| 30209 | 450 | 1300 | 0 | 13 | 19.6 | gap 1.7 cm | |
| 30210 | 450 | 1300 | 0 | 13 | 18.9 | same as previous | |
| **30211** | **450** | **1300** | **0** | **13** | **20.5** | **same as previous** | **best shot of the day** |
| 30212 | 450 | 1300 | 0 | 13 | 19.7 | same as previous | |
| 30213 | 450 | 1300 | 0 | 13 | 19.7 | same as previous + brick above gap | |
| 30214 | 450 | 1300 | 0 | 13 | 20.1 | visible whole hole in cylinder | |
| 30215 | 450 | 1300 | 0 | 13 | 19.3 | same as previous | |
| 30216 | 450 | 1300 | 0 | 13 | 19.1 | gap closed | |
| 30217 | 450 | 1300 | 0 | 13 | 19.2 | gap closed | |
| 30218 | 450 | 1300 | 0 | 13 | 19.0 | | |
| 30219 | 450 | 1300 | 0 | 13 | 20.3 | | |
| 30220 | 450 | 1300 | 0 | 13 | 20.3 | | |
| 30221 | 450 | 1300 | 0 | 13 | 19.0 | | |
| 30222 | 450 | 1300 | 0 | 13 | 19.2 | | |
#**Short analysis**
