CNRAD dosimetry and Summary of the TS Summary

CNRAD dosimetry and Summary of the TS • Summary of the Technical Stop • Installation have been performed the 11 th of May. • CNGS third slot - beam started on the 12 th of May at 11: 15 am • Next access will be between the 20 th and 24 th of June (to be defined) Power converters • IGBT setup has been removed (ΦHEH = 1. 33 E 12 cm-2) → very low xsections; Measurement of Ileak → Higher voltage test not necessary as 670 V is already a max. → Max. LHC tunnel dose and Φeq already reached • XP-Power AC-DC converter failed at a ΦHEH = 7. 4 E 9 cm-2 All the values are given with a factor of 2 of uncertainty • Another XP-Power AC-DC have been placed • During the 3 rd Slot it already failed at ΦHEH = 3. 1 E 8 cm-2 Deriv. FIP • Replacement of the regulator on the board supplying the Deriv. FIP module • There is a shift of the regulator on the Deriv. FIP module from 2. 5 V to 1. 9 V -> to be followed up • Observation of 1 event at 7. 34 E 11 cm-2 J. MEKKI 18/05/11 – Rad. WG meeting (1/3)

CNRAD dosimetry and Summary of the TS Next access between 20 th and 24 th of June BLM detectors Station 1: 3 CB 50 for high voltages 2 optical fibers 1 CB 50 for Remote Reset Cryo (Fip based) ? Station 2: 1 NE 48 Station 3: World. FIP PCI 1 MHz LED warning signs Station 3: Deriv. FIP Station 2: 1 NE 48 Station 4: 1 Profibus used as a FIP 1 Ethernet connection for Webcam 1 CB 50 for remote reset of the webcam Camera located below Station 4 where the radiation field should be low enough to avoid radiation damage Position to be discussed for the next slot Station 3: 1 NE 48 QPS ? Station 4: 1 NE 48 World. FIP PCI 1 MHz J. MEKKI 18/05/11 – Rad. WG meeting TE/EPC Station 1: 1 NE 48 (2/3)

CNRAD dosimetry and Summary of the TS Position of the Rad. MONs during the 2 nd Slot (01/04 19: 34 – 09/05 8: 00) Number of POTs: 1. 19× 1019 RM 8 box (5 V) Facing TSG 45 (90°) 1000 nm Close to the camera PMI 406 RM 10 dep 400 nm + 100 nm Dose: >3 k. Gy (100 nm measur. ) Saturation of the 400 nm (due to electronics) → replaced 1 -Me. V fluence: Saturation (due to electonics) at 2. 9× 1013 cm-2 Before saturation Φeq: 1. 14× 1013 cm-2 during slot 2. Dose : 1. 13 Gy (measur. ) HEH fluence: 9. 9× 108 cm-2 RM 7 dep BLM position Facing TSG 45 400 nm + 100 nm Dose: 337. 2 Gy 1 -Me. V fluence: 3. 33× 1012 cm-2 RM 8 dep LED position 400 nm Value to be checked at the end of Slot 3 Dose: 38. 9 Gy 1 -Me. V fluence: 3× 1011 cm-2 HEH fluence: 2. 35× 1012 cm-2 Value to be checked at the end of Slot 3 PMI 407 HEH fluence: 2. 1× 1011 cm-2 RM 7 box (5 V) Facing TSG 45 (90°) 1000 nm in short circuit To be read at the end of each slot Dose : 1. 65 Gy (measur. ) HEH fluence: 6. 1× 108 cm-2 (measur. ) : measurement value Otherwise Dragon tool value J. MEKKI Around 10 cm towards TSG 45 455 -bis RM 10 box (3 V) To calibrate the position Facing TSG 45 (45°) 455 : Dose: 16. 4 Gy HEH fluence: 8. 9× 1010 cm-2 455 -bis: HEH fluence: : 1. 3× 1011 cm-2 (measur. ) RM 9 box (5 V) Not possible to set 3 V Below Deriv. FIP module Facing TSG 45 400 nm + 100 nm (problem on the 15/04 08: 03 -> Stopped measuring POT: 3. 9 E 18) Total during Slot from Dragon tool: Dose: 149. 5 Gy 1 -Me. V fluence: 1. 5× 1012 cm-2 HEH fluence: 1. 1× 1012 cm-2 RM 11 box (3 V) RM 11 dep Facing TSG 45 400 nm + 100 nm (problem on the 06/04 16: 05 ->Stopped measuring (POT: 1. 2 E 18) Total during Slot from calibration table: Dose: 89. 2 Gy 1 -Me. V fluence: 1× 1012 cm-2 HEH fluence: 6. 7× 1011 cm-2 18/05/11 – Rad. WG meeting (3/3)

CNRAD dosimetry and Summary of the TS New positions RM 8 box (5 V) 1000 nm From Station 4 to position 463 RM 7 box (5 V) From Station 2 to position 456 J. MEKKI 18/05/11 – Rad. WG meeting (4/3)