Hi Rad Mat shielding Comparisons of Simulations with

Hi. Rad. Mat shielding – Comparisons of Simulations with Measurements R. Garcia Alia [EN-EA] & N. Charitonidis [EN-EA-LE] (acknowledgements: S. Danzeca [EN-STI-ECE] and A. Fabich [EN-EA-LE]) 07/11/2016

Outline • Introduction • HRDMT-27 measurements vs simulations: • • Near target TT 61 shielded area TJ 7 bunker TJ 7 outside bunker and TT 61 door • Summary, conclusions and outlook 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 2

Outline • Introduction • HRDMT-27 measurements vs simulations: • • Near target TT 61 shielded area TJ 7 bunker TJ 7 outside bunker and TT 61 door • Summary, conclusions and outlook 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 3

Introduction • Hi. Rad. Mat is a unique facility for high-intensity high-energy single pulse experiments • 440 Ge. V/c beam, up to 288 bunches of 1. 2 E 11 p/bunch • 23 experiments completed, 1 ongoing and 2 approved for 2017 • High prompt radiation in the experimental zone and in the neighbouring tunnels • Harsh environment for electronics / instrumentation • Careful choice of the equipment to be used and the position to be placed in the EA • The validation of FLUKA simulations with measurements is of critical importance in order to evaluate radiation levels as a function of target thickness and number of protons on target Rad. Mons + Batmons installed and measurements taken during 2015 and 2016 beam periods 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 4

Hi. Rad. Mat facility layout – FLUKA model m SPS 440 Ge. V/c beam fro TNC FLUKA model TT 61 TJ 7 TNC FLUKA model TA 7 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 5

Hi. Rad. Mat shielding 2015 situation 2015 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 6

Position of Bat. Mons for 2015 measurements 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 7

Targets and POT for HRDMT-27 • Input from Claudo Torregrosa (EN-STI-TCD) • Average target length: 1. 6λ • Measurement period: 2/11/2015 – 17/11/2015 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 8

Position of v 6 Rad. Mons for 2016 measurements 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 9

Comments related to measurement analysis • In most cases, measurement uncertainty is dominated by low count statistics • Therefore, when less than 10 SEUs are accumulated in the 5 V Rad. Mon, the analysis focuses on the 2 -sigma upper limit for the HEH fluence • The analysis of the 2016 runs is currently ongoing, with a focus on the April experiment 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 10

Outline • Introduction • HRDMT-27 measurements vs simulations: • • Near target TT 61 shielded area TJ 7 bunker TJ 7 outside bunker and TT 61 door • Summary, conclusions and outlook 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 11

TNC area (near target) theq fluence near target Measured values Rad. Mon Voltage SEUs STD 0032 5 V 7257 STD 0071 3 V 117323 FLUKA values HEHeq (cm-2) theq (cm-2) 5. 3 e 9 1. 8 e 10 8. 0 e 9 2. 0 e 10 • Good agreement between FLUKA and measurement • Within factor 1. 5, considered satisfactory provided the target geometry is not fully reproduced in FLUKA (objective is to represent it in a generic way as a function of λ) 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 12

Outline • Introduction • HRDMT-27 measurements vs simulations: • • Near target TT 61 shielded area TJ 7 bunker TJ 7 outside bunker and TT 61 door • Summary, conclusions and outlook 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 13

TT 61 shielded area Rad. Mon Voltage SEUs HEHeq (cm-2) STD 0075 5 V 2 STD 0067 3 V 9 STD 0076 5 V 4 STD 0066 3 V 55 STD 0072 5 V 4 <4. 0 e-6 STD 0073 5 V 3 <3. 0 e-6 <7. 3 e-6 <9. 6 e 6 • Radiation levels in feedthrough Rad. Mons similar to those in Rad. Mons behind shielding • Large gradient expected in FLUKA, therefore hypothesis is that the Rad. Mons were not actually fully aligned with the shielding openings • FLUKA values for region behind L-shielding (~5 e+5 cm-2) compatible with measured upper limit 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 14

TT 61 HEHEQ Fluence Target: 2 lambda (20 cm solid W) • Radiation level dominated by the concrete shielding and therefore large gradient appearing around shielding openings 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 15

Vertical cut just behind the shielding – 2 Lambda target case Equipment 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding The HEHEQ dose behind the bunker is dominated by the shielding and not from the feed- through openings. 16

Outline • Introduction • HRDMT-27 measurements vs simulations: • • Near target TT 61 shielded area TJ 7 bunker TJ 7 outside bunker and TT 61 door • Summary, conclusions and outlook 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 17

HEQ Fluence - Target: 2 lambda – TJ 7 bunker The bunker approximately reduces the flux by a factor x 7. Rad. Mon Voltage SEUs STD 0069 5 V 1 STD 0065 3 V 56 HEHeq (cm-2) <4. 8 e 6 • Upper measurement limit compatible with FLUKA simulation for bunker area 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 18

Outline • Introduction • HRDMT-27 measurements vs simulations: • • Near target TT 61 shielded area TJ 7 bunker TJ 7 outside bunker and TT 61 door • Summary, conclusions and outlook 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 19

Outside TJ 7 bunker and TT 61 door Rad. Mon Voltage SEUs STD 0070 5 V 19 STD 0064 3 V 189 STD 0074 5 V 1 STD 0068 3 V 4 14/12/2021 HEHeq (cm-2) 8. 34 e 6 – 2. 71 e 7 • Good agreement for TJ 7 Rad. Mon outside bunker (upper limit factor ~2 below FLUKA value) and TT 61 <5. 7 e 6 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 20

Outline • Introduction • HRDMT-27 measurements vs simulations: • • Near target TT 61 shielded area TJ 7 bunker TJ 7 outside bunker and TT 61 door • Summary, conclusions and outlook 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 21

HEHeq fluence – Target: 2 lambda (summary) Device Location Radmon Measurement Fluka STD 071 & STD 032 Experimental zone 5. 31 E+09 8. 00 E+09 OK STD 072 Feedthrough <3. 97 e 6 2. 00 E+08 Not at peak STD 073 Feedthrough <2. 98 e 6 2. 00 E+08 Not at peak STD 066 / STD 076 TT 61 equipment table <9. 55 e 6 5. 00 E+05 Behind bunker (left) STD 0067 / STD 0075 TT 61 equipment table <7. 30 e 6 5. 00 E+05 Behind bunker (left) STD 0074/STD 0068 TT 61 door <5. 74 e 6 5. 00 E+04 OK – Low statistics STD 0070/STD 0064 TT 61 door 8. 34 e 6 – 2. 71 e 7 5. 00 E+07 OK STD 0069 / STD 0065 TJ 7 bunker <4. 78 e 6 1. 00 E+06 OK 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding Notes 22

Current TT 61 shielding 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 23

Summary – Next steps • The FLUKA simulations of the facility’s model have been validated with RADMON/BATMON measurements A satisfactory agreement has been found between the FLUKA simulations & the measurements, bound to uncertainties in the positions of the monitors & the large fluctuations of the dose close to the shielding • The new shielding configuration will be implemented in FLUKA and the new measurements (taken in 2016) will be compared with the simulations. The FLUKA model of the facility can be trusted in order to assess the radiation levels for future experiments along with the permanent RADMON installations. 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 24

Backup 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 25

High Energy Hadron Equivalent Fluence Target: 1 lambda (10 cm of solid W) • Dose dominated by the concrete shielding and big differences appear in very close positions 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 26

HEQ Fluence Target: 3 lambda (30 cm solid W) • Dose dominated by the concrete shielding and big differences appear in very close positions 14/12/2021 N. Charitonidis & R. Alia-Garcia - Hi. Rad. Mat Shielding 27