Status update on the new PS wire scanners

Status update on the new PS wire scanners LIU-PS Working Group meeting 7 August 2018 Jonathan Emery for the BWS team

Content • LIU wire-scanner system & prototypes • What we have already learned from the PS prototype • Tests plan for the remaining run 2018 & Electronics and software status LIU-PS Working Group meeting - BWS status - 06. 08. 2018

LIU Wire scanner system Control & monitoring part Position (electrical) Power Particle beam Position (Optical) Losses Scintillator PMT LIU-PS Working Group meeting - BWS status - 06. 08. 2018 C P U C T R V V F C 1 V F C 2 H V Acquisition & supervision part

LIU BWS prototyping in the machines SPS prototype (2015 -2016) - 1 st iteration design mechanics & electronics - Acquisition sensors tests (Diamond) & PMT based ‘Standard’ PSB prototype (2017) - 2 nd iteration design mechanics & 1 st iteration electronics (new FW) - 1 st iteration multi-PMT PS prototype (2018) - 2 nd iteration design mechanics plan: - 2 nd iteration electronics - 2 nd iteration multi-PMT & VME based acquisition LIU-PS Working Group meeting - BWS status - 06. 08. 2018

BWS PS prototype • YETS 2016: Cables • YETS 2017: Scanner and tank, multi-PMT prototype • TS 1 2018: Noise reduction investigation for the Multi-PMT system PSB resolver installed next to the PS one for noise comparison Resolver instabilities fix tests • Challenges of this prototype: - First prototype having long cables (185 m, PSB 70 m, SPS 90 m) - New angular sensor with higher performance - First Multi-PMT over long copper cables (Bandwidth limitation, SNR) LIU-PS Working Group meeting - BWS status - 06. 08. 2018

What we have learned since YETS 2017 (Details) • 2 issues stopping the operation of the prototype: Angular position errors Fixed by Hardware & Firmware modification Motor cable power loss Fixed by Hardware & Firmware modification • Then (preliminary): Multi-PMT acquisition can operated without filters wheel CK 50 provides sufficient bandwidth for bunch by bunch Time of flight jitter to hit the beam ~0. 5 ms LIU-PS Working Group meeting - BWS status - 06. 08. 2018

PS Machine development run 2018 Date Nbr scans Beam types comment First outcome Analysis 2018/06/07 176 LHCPROBE, ZERO No beam available Glass disk fixation OK motion stability completed 2018/06/08 206 LHCINDIV Go through the cycle with static PMT settings Possible to measure beams with 2 Multi. PMT configuration completed 2018/06/11 249 LHCINDIV, LHCPROBE, TOF Static PMT settings & operational scanners comparison Different PMT are giving same beam size On-going 2018/06/13 51 LHC 25_BCMS Nominal beam intensity, static PMT settings Expected first bunch by bunch processing to do total 682 LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Angular position by the resolver PS MD offline processing of ~500 scans 3. 14 rad IN ANGULAR POSITION OUT ANGULAR POSITION 110 rad/s IN SPEED OUT SPEED Acquired by the ‘Dspace’ motion control prototyping platform LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Incremental optical position sensor (IOPS) MD offline processing of ~700 scans Crossing Speed ~ 15 ms-1 No Signs of disk drift! LIU-PS Working Group meeting - BWS status - 06. 08. 2018 Crossing Speed ~ 15 ms-1 No Signs of disk drift! Acquired by the oscilloscope based acquisition system

MD application LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Beam profile processing example (2018/06/11 - LHCINDIV). 3% . 9% 1 9± 2. 8 = σ 4 1. 6 = σ 3 1. 0 = σ 7 10 um 2. 8 σ= % . 2 ± 2 1 5± % . 1 ± 4 σ . 84 =0 . 7% 1 0± 1. 8 = σ % 5. 1. 2% % ± 8 1. 6 8 0 ± ±. 4 1 4 0. 8 = 0. 8 σ= = σ σ ± % 3. 8 s? ? itie bil ta m Ins u 88 m u 93 m u 40 No drift on beam centroids! LIU-PS Working Group meeting - BWS status - 06. 08. 2018 2 10 um 4 13 um um m 47 50 u

Beam profile processing example (2018/06/11 - LHCINDIV) IN + OUT SCANS 0 -101 @ 700 V IN scan OUT scan LIU-PS Working Group meeting - BWS status - 06. 08. 2018

PS LIU Wire scanner prototype today’s configuration Control & monitoring part Control development system “Dspace’’ 3 lver) (Reso n o i t i s Po Power Unit 1 st iteration electronics Power 2 Particle beam Position (Optical) Losses 1 optical -> analog Oscilloscopes Scintillator PMT LIU-PS Working Group meeting - BWS status - 06. 08. 2018 3 x CK 50 1 x CB 50 C P U LTIM synchro C T R V VME crate H V Acquisition & supervision part

PS LIU Wire scanner prototype final configuration to test Intelligent drive controller Position (Resolver) Power Particle beam C C T P R U V Position (Optical) Losses Multi-PMT LIU-PS Working Group meeting - BWS status - 06. 08. 2018 V F C 1 V F C 2 V F C 3 V F H C V 4 Acquisition & Supervision

Tests plan for the remaining run 2018 1. Multi-PMT 1 st complete assembly (tunnel) 2. VME based acquisition of the secondary shower and the incremental optical position sensor (surface) 3. 2 nd iteration of the control electronics (surface) 4. Link between the control electronics and the VME crate (surface) LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Tests plan for the remaining run 2018 1. Multi-PMT 1 st complete assembly Assembly with filters wheel - To be installed during TS 2 (similar configuration as today’s OP scanner) - To be qualified with beam: - Printed circuit board (PCB) PMT base with amplifiers - Removal of the mechanical filters wheel - direct connection scintillator/light guide to PMTs housing PMT R 9880 U similar type as today’s system LIU-PS Working Group meeting - BWS status - 06. 08. 2018 PSB scintillator configuration shown

Tests plan for the remaining run 2018 2. VME based acquisition PMT & IOPS For testing: Higher resolution digitalizes Analog inputs signal compatibility FESA based processing of the PMT and IOPS signal High speed digitalizes 3 x VFC-HD HW: VME, HV and TIMING already there 3 x VFC-HD and mezzanines to install SW: FESA class under construction (LTIM already being used) Based on existing python processing And later extended to experiment processing of the PMT and IOPS (turn by turn integration, bunch by bunch) LIU-PS Working Group meeting - BWS status - 06. 08. 2018 3 x C V V V C T F F F H P R C C C V U V 1 2 3

Tests plan for the remaining run 2018 3. 2 nd iteration of the control electronics based on BI common FPGA platform (VFC-HD) - We will use a stand-alone software to configure the motion - Then use LTIM pulse synchro for the motion - Large work on the FW at the moment (motion feedback) BWS mezzanine LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Tests plan for the remaining run 2018 3. 2 nd iteration of the control electronics Motor bench Development software directly connected to the motion control system Intelligent drive 2. 5 rad @ 80 rad/s 4. 7 rad @ 80 rad/s LIU-PS Working Group meeting - BWS status - 06. 08. 2018 VFC-based motion controller Selected result from the 2 nd iteration electronics and motor bench Nominal parameters PS scanner: 3. 14 rad @ 110 rad/s

Tests plan for the remaining run 2018 4. Link control electronics <->VME - Will be used to configure motion parameters from a FESA class Scan trigger transmitted using this link Custom optical link based on GBT low level layers FESA class not yet started (waiting for final memory mapping) C V V V C T F F F H P R C C C V U V 1 2 3 Motion settings + triggers + motion data/IOPS LIU-PS Working Group meeting - BWS status - 06. 08. 2018

To be tested after run 2018 • Control electronics final hardware (3 rd iteration): -> 3 PCB boards ready for prototype (Design office done) -> Very close to the 2 nd iteration that will be tested with beam Lots of changes done ‘by hand’ on the PCB boards -> We believe that the laser calibration bench will asses correctly the future performance of the motion • Acquisition hardware: -> if we change the digitalizers mezzanines -> PMT analog signal conditioning LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Summary • PS wire-scanner prototype gave us already lots of useful information • Majors issues due to long cablings were solved for this prototype and for the future series • The tests plan presented today should provide additional confidence for the motion control as well as for the acquisition of the secondary shower LIU-PS Working Group meeting - BWS status - 06. 08. 2018

ADDITIONAL SLIDES LIU-PS Working Group meeting - BWS status - 06. 08. 2018

What we have learned since YETS 2017 (Details) • Angular position errors Due to the vacuum membrane + long cables Fixed by control electronics hardware modification + FPGA firmware Now system capable of being adapted to any configuration of membrane / cable length (details available on additional slides) • Motor cable power loss Due to cable capacitance and powering technics used on the power inverter Fix on ‘Dspace system’ by doubling the ‘DC-bus’ supply Fix for the final electronics: Scanner supply only just before a scan (no continuous regulation of the position during seconds) • MD results (preliminary) Multi-PMT acquisition seems a viable solution to suppress the filters wheel Installed high speed cables are providing sufficient bandwidth for bunch by bunch Time of flight jitter to hit the beam ~0. 5 ms (DSpace control system) LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Admotec Precision AG report PSB type resolver LIU-PS Working Group meeting - BWS status - 06. 08. 2018 PS type resolver

Resolver phase alignment principle using FPGA RDC stimulation (blue) Reconstructed stimulation with defined phase ~ +111 deg Phase introduced by the resolver & cable Primary (blue) Secondary (red) Phase +52 deg Primary to secondary phase seen by the RDC: -24 deg LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Measures in the PS with the resolver WITHOUT PHASE ALIGNMENT WITH PHASE ALIGNMENT 20 k values (~every 2. 5 ms) 35750 – 35430 = 320 => 80 values (14 bits resolution) Effective resolution: ~8 bits 200 k values (~every 2. 5 ms) Systematic small shit at defined USER (sychro with the machine) 2720 -2688=32 (16 bits) => 8 bits shift (14 bits) Effective resolution (long term) 14 -3 = 11 bits! (short term is 14 bits) LIU-PS Working Group meeting - BWS status - 06. 08. 2018 Transition between values (small shit) to be recorded with Firmware update

4 Q 15 1 Q 16 2 Q 16 3 Q 16 1 Q 17 4 Q 16 2 Q 17 Thermal Simulation in Ltspice of one of the IGBT in the inverter protype. PWM = 16 k. Hz, Duty cycle 50%. 100 ms PWM seq. per sec. Filter 300 Vdc LIU-PS Working Group meeting - BWS status - 06. 08. 2018 250 m Cable Motor

Secondary shower sensing Up to ~230 m FPGA & On-board memory Analog – digital board Shielding PMT 1 Single Scintillator PMT n Copper cable conditioning Digitalization Channel compensation Local storage conditioning Digitalization Combination / selection Channel compensation Similar sensor as today: Scintillator + PMT Moving filters replaced by fixed filter and 4 PMTs Signal digitalization at the surface using direct digitalization on VFC Channel compensation, sensors combination and data reduction to be developed this year using field measurement (starting with scopes) • Take advantage of the FBCT experience with similar architecture • • LIU-PS Working Group meeting - BWS status - 06. 08. 2018 Network storage (Logging)

Secondary shower sensing Scintillator Optical filters Photomultiplier 3 2 amplifier Secondary particules detector LIU-PS Working Group meeting - BWS status - 06. 08. 2018 1

Multi-PMT LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Multi-PMT based acquisition noise investigation LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Multi-PMT based acquisition noise investigation LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Electronics hardware items EDA Designation Description Last revision Status Planning EDA-03592 BWSCPC BWS – Capacitor Power Charger V 3 ready Engineering check Start prod 09. 2018 EDA-03519 BWSMIB BWS – Motor Inverter Board V 2 ready Engineering check Start prod 09. 2018 EDA-03096 BWSAIF BWS – Analog Interface FMC V 3 ready Engineering check Start prod 09. 2018 EDA-03624 BWSFHE BWS – FMC Height Extender V 2 ready Engineering check Start prod 09. 2018 EDA-03698 BWSVPA BWS – VME Power Adapter V 1 ok EDA-03764 BWSPSA BWS – Particle Shower Acquisition V 1 prototyping To be installed in the 3 machines during TS 2 EDA-03634 BWSIDC BWS – Intelligent Drive Crate V 1 prototyping V 2 – 11. 2018 EDA-03697 BWSMCU BWS – Motion Control Unit V 1 prototyping V 2 – 11. 2018 LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Serial number assignment and reading from the surface • Hardware encoding of an unique serial number • Cabled on the scanner connector (9 bits of information) • Red from the surface electronics at any time • Could be red automatically during the calibration process • Calibration tables will have this number referenced in the files • Will be used to unsure to correct assignment of the calibration table • Remove any doubt over time • Can be used by the electronics to adapt its behavior in function of the machine BSM 19 -7 BSM 19 -15 LIU-PS Working Group meeting - BWS status - 06. 08. 2018 Machine (3 bits) 0. 1. 2. 3. 4. 5. 6. 7. LAB PS SPS LHC --free ISS Version (2 bits) 0. 1. 2. 3. Rev 0 Rev 1 Rev 2 Rev 3 Scanner number (4 bits) 0 - 15

Software C P U C T R V F C 1 V F C 2 H V VME boards configuration Machine Synchro triggers PMT acquisition • One crate should operate 4 scanners (8 VFC, CTR, 2 x HV). We needs test for: - Many use cases (data, repetition rate, processing) - Data size (PPM) and data transfer (VME and FESA) - Data fitting of large number of bunches - Potentially offline processing of the optical encoder (large data set) LIU-PS Working Group meeting - BWS status - 06. 08. 2018

Motion performance optimisation (2017 studies) • First motion strategy investigation this year (2017) • Next step, impact evaluation on the scanner precision (2018) PSB 133 [rad/s] => ~20 [m/s] PS-SPS Asymmetric motion strategies: First to second: Longer stoke and ~ acceleration / 2 First to third: Longer stroke ~ acceleration / 3 110 [rad/s] for SPS Motor design (nominal spec) Max ~160 [rad/s] => 29[m/s] tang. Angular speed during a measure cycle, ‘IN’ part

Motion performance optimisation • Study of different motion strategies: - Lower the stress on the scanner mechanics, while keeping the nominal speed. • - Evaluate the impact of suppressing the constant speed (to lower eventual wire vibration). • - Increase the nominal speed to unsure a high projected speed. A. Classical approach B. 2 crossing strategy: Time between crossing 1 & 2: 15 [ms] => Potentially useful for operation

BWS Connections to external systems General Machine Timing (GMT) Low jitter < 1 ns, Granularity: 1 ms Beam Synchronous timing (BST) Bunch synchronisation (25 ns accurate clock) Expert monitoring Revolution frequency synchro Triggers: scan start, post-mortem Granularity: 89 us (LHC), low jitter < 1 ns FESA class BST receiver Settings Control room (CCC) C P U T I M I N G Ethernet TCP/IP – RJ 45/SFP+ Optical link – SFP+ Trigger input INTELLIGENT DRIVE Logging storage Long term storage for offline analysis PHASE 2 ACQUISITION AND SUPERVISION LIU-PS Working Group meeting - BWS status - 06. 08. 2018 PHASE 1