Test results of MKD/B1 UA63/67 radiation levels

Viliam SenajLIBD meeting 25/09/2013

Radiation measurements in UA63/67

Schematics of UA63

Schematics of UA67

Evaluation of TLDs installed in 2009

Rep. ZONE POSITION No. DOSIMETREDATE DE MISE

EN PLACE DATE DE MESURE MCP-7 MCP-N MTS-7 MTS-N

1 MKD 63 Rack Electronique-A 4316 26/08/2009 0.90 0.94 0.85 0.882 MKD 63 A 4317 26/08/2009 0.83 0.88 0.81 0.843 MKD 63 B 4318 26/08/2009 0.89 0.92 0.84 0.864 MKD 63 C 4319 26/08/2009 0.89 0.88 0.84 0.875 MKD 63 D 4320 26/08/2009 0.89 0.92 0.84 0.876 MKD 63 E 4321 26/08/2009 0.94 1.04 0.86 0.887 MKD 63 F 4322 26/08/2009 0.92 0.94 0.83 0.898 MKD 63 G 4323 26/08/2009 1.03 1.03 0.85 0.899 MKD 63 H 4324 26/08/2009 1.13 1.32 0.88 0.9310 MKD 63 I 4325 26/08/2009 0.96 0.99 0.85 0.8811 MKD 63 J 4326 26/08/2009 0.89 0.89 0.85 0.8812 MKD 63 K 4327 26/08/2009 0.94 0.89 0.85 0.8813 MKD 63 L 4328 26/08/2009 0.91 0.97 0.83 0.8714 MKD 63 M 4329 26/08/2009 1.00 1.04 0.86 0.9015 MKD 63 N 4330 26/08/2009 1.17 1.21 0.89 0.9116 MKD 63 O 4331 26/08/2009 1.13 1.16 0.86 0.9117 MKD 63 Rack Electronique-O 4332 26/08/2009 0.99 0.99 0.92 0.92

18 MKBH 63 A 4333 26/08/2009 0.98 0.97 0.93 0.9419 MKBH 63 D 4360 26/08/2009 0.93 0.95 0.93 0.9520 MKBV 63 F 4361 26/08/2009 0.92 0.95 0.90 0.92

1 MKD 67 Rack Electronique-A 4362 26/08/2009 0.86 0.88 0.86 0.862 MKD 67 A 4363 26/08/2009 0.81 0.86 0.81 0.843 MKD 67 B 4364 26/08/2009 0.84 0.83 0.81 0.844 MKD 67 C 4365 26/08/2009 0.86 0.87 0.83 0.845 MKD 67 D 4366 26/08/2009 0.86 0.92 0.84 0.866 MKD 67 E 4367 26/08/2009 0.86 0.89 0.84 0.877 MKD 67 F 4368 26/08/2009 0.89 0.89 0.86 0.898 MKD 67 G 4369 26/08/2009 0.92 0.95 0.85 0.889 MKD 67 H 4370 26/08/2009 1.14 1.13 0.86 0.8710 MKD 67 I 4371 26/08/2009 0.88 0.91 0.83 0.8811 MKD 67 J 4372 26/08/2009 0.82 0.83 1.07 0.8012 MKD 67 K 4373 26/08/2009 0.85 0.82 0.80 N/A13 MKD 67 L 4374 26/08/2009 0.84 0.83 0.81 0.8214 MKD 67 M 4375 26/08/2009 0.93 0.94 0.85 0.8715 MKD 67 N 4376 26/08/2009 1.14 1.16 0.85 0.8516 MKD 67 O 4377 26/08/2009 1.03 1.03 0.83 0.8317 MKD 67 Rack Electronique-O 4378 26/08/2009 0.94 0.95 0.88 0.91

18 MKBH 67 A 4379 26/08/2009 1.01 1.01 0.95 0.9819 MKBH 67 D 4380 26/08/2009 1.28 0.95 0.92 0.9520 MKBV 67 F 4381 26/08/2009 0.91 0.92 0.89 0.92

INSTALLATION DOSIMETRES EN UA 63/67

Apr-13

Dose [mGy]

To be learned from the radiation measurements

• Radmons - too insensitive (for doses at UA)• TLDs – clear effect of non-shielded ducts (in front of Gen. G/H

& N/O)• Visible effect of shielded duct in front of Gen.C – no increased

dose• To evaluate TLDs correctly we need to deduce background (x-

ray etc.) but we don't have reference measurement. Background estimated to 0.8 mSv. HEH = dose x 2.5e6 so max HEH fluences ~ 6e5 HEH/cm2 (if neglected 2009-2011)

• Average fluence probably close to estimated one (1e5 HEH/cm2.year)

• Shielding of residual large openings requested

T_delay comparison prior and after LS1 maintenance

T_rise comparison prior and after LS1 maintenance

I_ref100% comparison prior and after LS1 maintenance

R_end comparison prior and after LS1 maintenance

R_1 comparison prior and after LS1 maintenance

R_2 comparison prior and after LS1 maintenance

Corrected T_delay after LS1 maintenance

T_rise after LS1 maintenance

Target T_delay after LS1

I_ref/E after LS1 maintenance

T_rise after LS1 maintenance

R1 after LS1 maintenance

New settings

Comparison MKBs – I_max1

Comparison MKBs – I_min1

Comparison MKBs – R_max2

Comparison MKBs – T_zero1

Comparison MKBs – T_zero4

Comparison MKBs – Low_thr

Resonance between GTO stacks without and with damping ferrite tores

• Artificially induced resonant ringing between 2 stacks (1 nf in parallel with 1 GTO) – simulating effect of sparking; signal measured on retring pick-ups Cts2 a&b

• Resonance at ~ 2 MHz with low damping factor generally observed • Adding of a lossy ferrite in HV path of each GTO stack (tore cutted in two – no need

for dissasembly) – reducing resonant frequency to ~ 1 MHz; significant damping and saturation effect (increasing T_threshold and reducing T_rise)

Energy scan without and with FT

Increased T_thr without much influence to T_delay = reduced T_rise (~-30 ns)