Belle VXD Environmental Monitors and Interlock Lorenzo Vitale Univ. & INFN Trieste On behalf of VXD monitoring crew BPAC focused VXD review KEK, October 17, 2017 17/10/17 VXD Monitoring & Interlock - VXD PAC 1
Outline Belle Belle Belle Belle • Radiation: sCVD Diamond sensors • Temperature: NTC and FOS • Humidity: Dew Point “sniffers” • VXD Local Hardwired Interlock (VLHI): PLC Prototypes have already been operated in Phase 1 or VXD Beam Tests • here shortly mention phase 1 • more on installation status and schedule → both Phase 2 and Phase 3 sometimes overlapping 17/10/17 VXD Monitoring & Interlock - VXD PAC 2
Belle Environmental monitoring summary Belle Belle Belle Subsystem Phase 1/Beam Test Phase 2 Phase 3 Sensors Sensors Sensors Time span Feb-Jun 2016/Mar Feb-Jun 2018 Dec 2018 → 2016 + Mar 2017 Diamonds 4 8 20 NTC 26 26 56+12 FOS 1 fiber 4+2 fibers 38+2 8 sensors 26 sensors 232 sensors Dew Point 1 1+3 1+3 17/10/17 VXD Monitoring & Interlock - VXD PAC 3
Belle RADIATION: SCVD DIAMONDS 17/10/17 VXD Monitoring & Interlock - VXD PAC 4
sCVD Radiation Sensors: Phases 2 and 3 Belle Belle Belle Belle 4 + 4 sensors 6 + 6 sensors PXD-beam pipe close to SVD L3 support rings Now: Phase 2 : 8 “PXD” sCVD sensors Installing Phase 3 : 8 “PXD”+ 12 “SVD” Assembling + test, → calibration 1-2 weeks/sensor 17/10/17 VXD Monitoring & Interlock - VXD PAC 5
Phase 1 results Belle Belle Belle Belle Integrated dose Belle Belle Belle integrated dose [krad] 120 FW_180 position FW_0 position 100 BW_180 position BW_0 position 80 60 40 20 0 01/07/16 01/25/16 02/12/16 02/29/16 03/18/16 04/05/16 04/23/16 05/10/16 05/28/16 06/15/16 07/03/16 date [m/d/y] integrated dose measured FW_180 in the four position on the BW_180 beam pipe BW_0 FW_0 13 KEK, 05-02-2017 BEAST-II phase 1 - diamond sensors 17/10/17 VXD Monitoring & Interlock - VXD PAC 6
Belle Phase 1 diamonds– aborts, refilling Belle Belle Belle Dia2 Dia0 HER current, pressure HER 3 LER Dia1 Dia3 LER current, pressure Abort Aborts 17/10/17 VXD Monitoring & Interlock - VXD PAC 7
Correlations with LER, HER Belle Belle Belle Belle FW_180, BW_0: very sensitive to LER, not to HER Dia2 Dia0 HER current, pressure FW_0, BW_180: same sensitivity for both Dia1 Dia3 LER current, pressure 17/10/17 VXD Monitoring & Interlock - VXD PAC 8
sCVD sensors: assembly, tests, calibration Belle Belle Belle Belle • Package preparation: HV test, sensor gluing, cables soldering/gluing, I-V in the dark • Transient Current Test (TCT) with alpha source fast amplifier + fast oscilloscope sCVD crystal quality, electrons/holes transport parameters • Beta source (3 MBq): Priming/pumping to fill-in traps Stability tests at “high” current (about 1 nA) Calibrations: current vs particle flux (realized by changing the source distance), comparison with Fluka simulation and film dosimeters 17/10/17 VXD Monitoring & Interlock - VXD PAC 9
Example from 17 tested sensors Belle Belle Belle Belle Calibrations : extracted from the sCVD current vs source distance, at different HV value and polarity, compared with FLUKA simulations New : also radiochromic film dosimeters, collaboration with Naples 100 V 1.4 200 V 300 V 1.2 current [nA] 1 0.8 Dose range: 3 kGy- 100 kGy 0.6 0.4 0.2 0 0 10 20 30 40 50 Source distance [mm] 17/10/17 VXD Monitoring & Interlock - VXD PAC 10
Film positioning in Phase 2 Belle Belle Belle Belle Diamonds Several on FANGS, in particular 3 strips along z SVD Outer Cover and Cartridge walls Thin strips on Moreover PLUME & ECL detectors, DOCKS Beam Pipe So far 4000 cm 2 , aiming to reach 7000 cm 2 SVD Layer 3 “fingers” 17/10/17 VXD Monitoring & Interlock - VXD PAC 11
Phase 3: Diamond installation Belle Belle Belle Belle 6 final diamond sensors mounted in June 2017 on the first 2 SVD half-cones (BW and FW) 17/10/17 VXD Monitoring & Interlock - VXD PAC 12
Phase 2: Diamonds installation Belle Belle Belle Belle • All 8 diamonds for phase 2 installed on the beam pipe on Sept 18-19 • Functionally tested with a 90 Sr beta source • Two radiochromic films were attached on their inner surface • Moreover two thin strips on BP 17/10/17 VXD Monitoring & Interlock - VXD PAC 13
Diamonds readout electronics Belle Belle Belle Belle Prototype 4-channel module: • HV, currents digitization and averaging, beam abort logics successfully tested in Phase 1 (no abort) Final engineered version in delivery • now the FINAL re-engineered hardware parts of the radiation monitoring electronics (FPGA board, analog front-end board, HV modules, Ethernet interfaces) are READY AND TESTED The mechanical assembly of 2 modules for 8 diamonds are ongoing for Phase 2 3 additional modules + 1 spare will be ready for Phase 3 (ordering now) Development in collaboration • Elettra Sincrotrone Trieste SCpa (Electronics Division G.Cautero et al.) 17/10/17 VXD Monitoring & Interlock - VXD PAC 14
Belle TEMPERATURE: NTC AND FOS 17/10/17 VXD Monitoring & Interlock - VXD PAC 15
SVD Temperature Belle Belle Belle Belle • Requirements: Temperature monitoring & interlocks: 0.1 o C precision, 1 o C accuracy Monitoring points: - close to SVD FE chips (heat sources) - Inlets and outlets of CO 2 cooling pipes & half rings (possible indication of cooling failure) • Design: - FBG (Fiber Bragg Grating) sensors on optical fibers (FOS), embedded in SVD ladders (Airex) - NTC thermistors, with hardware interlock capability, on cooling pipes and half-rings 17/10/17 VXD Monitoring & Interlock - VXD PAC 16
Belle NTC final configuration for Phase 3 Belle Belle Belle BACKWARD FORWARD CO2.5 CO2.7 6 6 LEFT in 5 in 5 3 3 HALF RINGS LEFT LEFT ORIGAMI CO2.11 L.6 in HALF out out out in L.5 CO2.9 L.4 out CO2.6 CO2.8 6 6 in 5 5 in RIGHT 3 3 HALF RINGS RIGHT CO2.12 RIGHT ORIGAMI L.6 in HALF out out out in CO2.10 out + FOS.1-8 + CO2.9-12 + CO2.1-8 17/10/17 VXD Monitoring & Interlock - VXD PAC 17
NTC read out for Phase 3 (&2) Belle Belle Belle Belle sensors docks Box in Electronics Hut twisted 4 interlock signals BW 4 interlocks ≈ 3÷4 m pairs (32) to PLC Current ELMB sources 0A 2 x 16 twisted + interlocks pairs 4 interlocks FW Current ELMB sources 0C + interlocks 4 interlocks BW Current ELMB sources NTC Readout 0E + interlocks PC CANbus Power supply EPICS 17/10/17 VXD Monitoring & Interlock - VXD PAC 18
Belle NTC temperature sensors: installation Belle Belle Belle • Phase 3 In June the read out system and all the sensors were shipped to KEK, and re-tested: they have be mounted (1/2) at the end of July and (1/2) in December for the Ladder Mount of the two SVD halfs • Phase 2 In July the back-up read out system and the sensors used for the DESY beam tests were dis-assembled and shipped from DESY to KEK. It has re-assembled in September with small modifications for Phase 2 17/10/17 VXD Monitoring & Interlock - VXD PAC 19
Temperature FOS sensors: first half 2017 Belle Belle Belle Belle Calibrations of 55 fibers completed • Cutting fiber excess & glueing clamps • System test with splitters and first • prototype of EPICS software Mechanical tests in May at KEK: • insertions on all ladders interference with Layer 6 logistics in B1 glueing on the SVD Outer Cover 17/10/17 VXD Monitoring & Interlock - VXD PAC 20
FOS Schedule Belle Belle Belle Belle Schedule: • 2 Fibers for phase 2 outer cover installed on May • 2 Fibers for phase 3 outer cover → installed in September • 3 Fibers for phase 2 cartridge → installed in September • 19 fibers SVD Ladder Mount +X half → first 2 installed on Layer 4 Sep-Oct • 19 fibers SVD Ladder Mount -X half → to be installed starting from January 2018 Present status: • 2 readout “interrogators” are available at KEK • All fibers are available at KEK 17/10/17 VXD Monitoring & Interlock - VXD PAC 21
Belle HUMIDITY: DEW POINT SNIFFERS 17/10/17 VXD Monitoring & Interlock - VXD PAC 22
Dew Point Sniffers: overview Belle Belle Belle Belle • Based on Dew Point Sniffers Humidity Sniffer • Reduced system (1 line) Successfully operated in in two Beam Tests at DESY • Full system: completely defined 4 Vaisala Dew Point Transmitters Pressure sensors Bronkhorst flow meter Calibration system (DewGen, DewMaster) 2 pumps 17/10/17 VXD Monitoring & Interlock - VXD PAC 23
Dew Point Sniffers: status Belle Belle Belle Belle Mechanics: Crate hosting Vaisala sensors, • pressure sensors, flowmeters and electronics CAD design completed • Mechanical components available • Mechanical assembly: started in October • Sensors, electronics: • All components available • Readout interfaces and drivers: ready • Linux software developed & tested for all • sensors/actuators Next: • Completion of mechanical assembly and tests before • shipping to KEK in November EPICS interface in October • “DESY prototype” to be delivered at KEK as back-up • 17/10/17 VXD Monitoring & Interlock - VXD PAC 24
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