Pb shielding of NaITl detector - first attempt (2. 4. 2019)
#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