1. 19/06/20081 CNGS Operation Part 1 : CNGS beam operation. Protons on their way to the target. CNGS specialties. Part 2 : Extraction Interlock System. Detailed description. J. Wenninger Acknowledgments : Edda, Verena, Konrad … for figures, photos and numbers.

2. CNGS ‘Facility’ 19/06/20082 A dedicated primary beam line (TT41), a target chamber (target T40), a decay tube & a muon detection infrastructure. ‘Attached’ to the LSS4/East extraction channel.

3. CNGS Tunnels 19/06/20083

4. 4

5. Our Goals 19/06/20085 Send 4.8x10 13 protons to target in every CNGC cycle  Tune, tune, tune … Keep the beam within +- 0.5 mm of the target axis to prevent damage !  Interlocks, interlocks, interlocks…

6. 19/06/20086 CNGS Magnetic Cycle The CNGS beam magnetic cycle is almost identical to the FT beam: the only difference is the much shorter 400 GeV flat top – only 90 ms: 2 fast extractions are programmed 20 ms and 70 ms from the start of the flat top. Time (ms) P (GeV/c) Injections at 0 and 1200 ms. Ramp from 1260 to 4200 ms. Flat top from 4200 to 4290 ms. Extractions at 4220 and 4270 ms. Cycle length 6 s – 5 BPs. Same optics and tunes than FT beam: Q = (~26.62,~26.58)

7. 19/06/20087 CNGS Beam Longitudinal: 2 batches of ~10.5  s (5/11 of SPS). 2 gaps of ~ 1  s (kickers !). Bunch spacing 5 ns. Bunch length at 400 GeV ~ 2 ns. Transverse: Normalized emittance  *  8-10  m. Beam sizes at 400 GeV (10  m): -Wire scanner 51995  H/V  1.4/0.8 mm -Target T40  H/V  0.5/0.4 mm CNGS beam = FT beam with more intensity, up to 4.8x10 13 p. LHC FBCT Batch 1Batch 2 Kicker gaps

8. LSS4 Extraction Channel 19/06/20088

9. LSS4 Fast Extraction Channel 19/06/20089 5 extraction kicker magnets (MKE) operated at 50 kV. 6 septum magnets (MSE), installed on a movable girder. 4 horizontal and 4 vertical bumper magnets: - Horizontal extraction bump of 31.1 mm @ monitor BPCE.418 TPSG protection element for the MSE.

10. Extraction Kicker MKE 19/06/200810 Key constraint for the fast extraction : < 0.1% beam loss during extraction !  Radiation in ECX4 + activation of extraction channel This means that : Beam gaps must be VERY clean. MKE settings (delays, kick length) are critical. Beam Kicker Waveform Preliminary settings

11. MKE4 Kick Alignment 19/06/200811 OASIS global to observe beam and kick. Note that the BEST tuning parameter are the losses in LSS4 : Minimize on first extraction. Adjust second extraction to have no losses : the first batch is gone – there is space !!!

12. MKE is the heart of the extraction 12 MKE Extraction Interlock System Beam Energy Tracking System Slow Timing Extraction Pre-pulse Beam kicked into septum gap Both SW and HW interlock systems act on the MKE and on the (timing) beams with destination CNGS (for SIS), but not on the beam dump and not on the SPS ring HW interlock system.  There is NO coupling with LHC or FT beams !!! 19/06/2008

13. One of the worst failures of the extraction system is to : Kick with too little/high voltage at 400 GeV. Nominal kick significantly below 400 GeV. To protect the extraction channel and line against such failures, the MKE has an internal Beam Energy Tracking System (BETS) that ensures that: The measured energy for CNGS is within ~0.5% of 400 GeV. The momentum aperture of the line is > +- 0.6%. The energy measurement is based on the current of the main dipoles. The measured kicker voltage must be 50 +- 2 kV.  Inhibits the extraction (no kicker fault !) if not OK ! Beam Energy Tracking 19/06/200813 !! The BETS does not take into account the energy change due to a radial position offset – please do not trim the radial position for Q’ etc measurements on the flat top – or stop the extraction first !!

14. MKE Trigger Logic 19/06/200814 1.Extraction – 13 ms : the PFNs (Pulse Forming Networks) are charged provided the extraction interlock system gives the green light. 2.Extraction + 0.4 ms : the MKEs are triggered when the RF pre-pulse arrives provided that : i.The extraction interlock systems gives the green light. ii.The BETS system gives the green light. Extraction interlock permit CNGS BETS LHC BETS PFN voltage -13 ms ~+0.4 ms NB: the +0.4 ms delay wrt ‘nominal’ extraction time is due to delays in the RF prepulse generation & CTRVs

15. MKE : Missing Triggers 19/06/200815 If for one reason or another the MKE PFN’s are charged, but not triggered normally (last ‘minute’ interlock, no pre-pulse) the PFNs will be discharged in the clipper switches. Such abnormal discharges should not be repeated for many cycles, therefore the MKE will go to FAULTY state when this happens more than 4 times over a certain time interval: If it happens, switch the kicker back on and try again. If the problem occurs again after a few cycles, check or call some experts…

16. Extraction Septum 19/06/200816 ElementL mag (m) B (T)Kick/mag (mrad) I nom (A)Septum Thickness (mm) Gap Height (mm) MSE2.24~1.52.1~2000017.220 MSE Extraction channel 16

17. LSS4 Extraction BLMs 17 TPSG Septum magnets BLM1BLM2BLM3BLM4BLM5BLM6BLM7BLM8 Beam loss due to a large vertical size or tails appear here, at exit of septum (largest V size). Loss distibution is due to residual beam in the abort gap. ~ 2x10 13 p The LSS4 BLMs are connected to the ring BIS system (and to the dump) because losses can come from the extracted or circulating beam. The interlocks is latched after 3 cycles by SIS! 19/06/2008

18. RF & Kickers Tuning for clean gaps! 19/06/200818 Constant Voltage 0.9MVThe voltage is ramped up to ~1.3-1.4 MV after injection to minimize beam in the gaps !

19. MKP for CNGS 19/06/200819 An alternative method to clean the gap is to advance the second kick of the injection kicker a bit. Necessary if it does not work with the RF. Used regularly in 2007… ROBUST !!

20. TT40/TT41 Transfer Lines 19/06/200820

21. TT41 Transfer Line 19/06/200821 ~720 m long, 837 m if TT40 is included (from MSE). A string of 8 dipoles (MBSG, RBI.410010) is used to bend the beam towards CNGS. For LHC operation the MBSG is at 0 current. The lattice is basically the same as for the SPS (betatron & dispersion functions). Final focus at the end to reduce beam size on target. Aperture for the beam : > +- 20 mm in H/V.

22. Main Bends (RBI.816) powering 19/06/200822 Interlock DCCTs MUGEF for ‘standard’ surveillance The TT41 and TI8 main dipoles are powered by a single converter, with switches (mechanical and electronic) to send the current into the correct magnet string. The mechanical switches are interlocked with the access chains. To run CNGS when TI8 is in access (like now !), the TI8 (load) switch must be to Earth. If that is not the case, there will be an access interlock on the PC & an alarm for the LHC access system! To control the switches – use the PC expert (Labview) program ! To ensure that the switch position is correct, there are 2 ‘dummy’ ROCS channels that have only an interlock DCCT but no converter. The names of the ROCS are DCCT_TI8 and DCCT_CNGS (also accessible from equipstate). The 2 DCCTs are used to identify which branch is powered, and their current is interlocked like any other converter. Mechanical swicthes

23. RBI.816 Settings - nominal 19/06/200823 For a SC with interleaved CNGS & LHC, the PC must normally switch load according to the cycle. RBI.816 has settings for CNGS & LHC. The switching will be implement with LTIMs that will be activated either by USER or from the DESTINATION information: o Not tested yet – JULY ? o For the moment the automatic switching is deactivated. CNGS LHC

24. RBI.816 in CNGS only mode 19/06/200824 To run CNGS alone with LHC access veto on TI8, the switching is deactivated and the IREF function of RBI.816 must be zeroed MANUALLY in the trim editor !! If the function for LHC is not zeroed, the CNGS dipoles will pulse at the equaivalent energy of ~ 520 GeV: o Not a problem for the magnets themselves (D. Smekens dixit). o Could perturb steering and optics due to the change of remanent field ! >> watch out when creating new super cycles!!!! CNGS LHC

25. Beam Position Monitors TT40/41 19/06/200825 23 H+V position monitors are installed in TT40 & TT41: o 18 button monitors (TT41). o 5 couplers: 4 in TT40, 1 in front of T40 (on the target table). Self-triggered electronics: o No gain, but a variable integration window (0.4 or 8  s). Default integration window for regular operation is 8  s. o At low intensity there can be triggering problems…

26. Steering TT40/TT41 19/06/200826 Steering in TT40/41 is rather easy and reliable (MICADO 1-3 correctors). The line is very stable and requires very little steering : ~ once per 1-2 weeks ! The positions are interlocked, always steer towards the REFERENCE trajectory (beam-target alignment) ! The interlock margin on correctors is +- 15  rad, +- 20  rad for the last 4. +- 4 mm +- 2 mm +- 0.5 mm Tolerances : (changes are possible) Those offsets are ‘normal’ : TL-target (mis) alignment !! !! 2007 reference !! >> will be updated !!

27. TT40/TT41 BLMs 19/06/200827 In 2007 we had NO losses in the transfer lines  very low thresholds. The TT41 thresholds are 5 mGray (compare to 50-200 mGray in ring). BLMs around the TED and at the collimator in front of T40 have higher thresholds to avoid false interlocks when the beam is dumped on the TED. TT40 TT40 TED TT41 Collimator in front of T40 TI8 – not relevant… After target, not interlocked !! ~ 2.5x10 13 p

28. Timing 19/06/200828

29. Extraction Timing / I 19/06/2008 29 CTIMs The timing must be identical on ALL CNGS users ! Please do not change it - it has consequences on interlocks, logging… Legacy CTIMs The extraction window open delay must be 18 ms – very critical – if it is different the MKE will not trigger. RF extraction pre-pulses (RF2)

30. MKE Trigger Timing 19/06/200830 The fast extraction pre-pulses are generated by the SPS RF system (in the Faraday cage in BA3) and distributed over the SPS. A local timing module (CTRV) filters the pre-pulses and distributes them to the SPS kickers (also valid for MKP) – via an LTIM. For MKE4/MKE6 the pre-pulse distribution is filtered on beam DESTINATION (also valid for the extraction warning event): CNGS pre-pulses are only distributed when the beam destination is CNGS. LHC pre-pulses are only distributed to MKE4 when the DYNAMIC DESTINATION is TI8_DUMP or LHC2_TI8. LHC pre-pulses are only distributed to MKE6 when the DYNAMIC DESTINATION is TI2_DUMP or LHC1_TI2. >> If the beams go to spare – kickers do not charge and do not kick ! --> no testing possible without beam !!!!!!!!!!!!!!! >> For LHC the beams must be declared ‘TO_LHC’ in the sequence.

31. For Info : MKE Extraction LTIMs 31 MKE6 kicker MKE4 kicker Normally this should not be touched !! 19/06/2008

32. Multiple CNGS cycles 19/06/200832 When we run with 3 CNGS cycles mapped to different USERs (CNGS1-6), the ring & TT10 settings may be different for the 3 cycles/USERs. In any case all PC settings will be independent for all cycles/users. The settings for East Extraction (bumpers, septa), CNGS Transfer (TT40 + TT41), Interlocks … must be identical on all cycles. A trim must be propagated to all cycles ! The following page has recommendations & rules for settings copy : http://jwenning.home.cern.ch/jwenning/SPS_Settings.html

33. Secondary Beam 19/06/200833

34. 19/06/200834 CNGS Secondary Beam 43.4m 100m 1095m18m5m 67m 2.7m TBID / 2 Ionization Chambers Muon Detectors TBID: Target Beam Instrumentation Downstream p + C  (interactions)   , K   (decay in flight)     

35. Extraction Interlocking 19/06/200835 Target Horn

36. 19/06/200836 13 carbon target rods  5 & 4 mm total length 2 m

37. CNGS Muon Monitors 19/06/200837  

38. 19/06/200838 270cm 11.25cm Muon Detectors

39. Muons Profiles 19/06/200839 A fixed display for muon profiles and status of target/horn/reflector/shutter is available. It includes multiplicities and a status word (color) on the quality ! Good Medium Ugly

40. Secondary Beam Control 19/06/200840 The target is not under our control. Horn and reflector are controlled through the working sets. Important : The brilliant SW of the horn/reflector only allows control when a CNGS user is active. Without CNGS user in the SC, one cannot even switch the horn/reflector ON and OFF !!!!!

41. Secondary Beam ‘Steering’ 19/06/200841 To steer the beam in the muon chambers, use orthogonal steering at target T40 (Steering, Machine Specials menu – similar to T2, T, T6): Sensitivity : 1 mm @ pit 2  0.1 mm parallel steering (angle = 0)

42. Extraction Interlocks 19/06/200842

43. SIS for TT40 19/06/2008 43 Target BICs Timing inhibit that stops beams with destinations passing through TT40 : CNGS, TI8_DUMP, LHC2_TI8 One SIS interlock tree is dedicated to TT40. As usual SIS acts on the BICs and one the timing system. The tree contains the usual stuff (PCs, BTVs, …) but also a surveillance of BLM thresholds (not too high !) and other parameters related to the HW interlock system

44. SIS for TT41 19/06/2008 44 Target BICs Timing inhibit that stops beams with destination CNGS One SIS interlock tree is dedicated to TT41. The tree contains the usual stuff (PCs, BTVs, …) but also a surveillance of BLM and BPM thresholds and other parameters related to the HW interlock system

45. MTG Inhibits 19/06/200845 The SIS signals in the sequence manager (External Conditions)

46. HW Interlock System 19/06/200846 The EAST extraction HW interlock system consists of 7 BIC modules. The hardware is identical to the SPS ring beam interlock system: There 6 ‘standard’ BICs for TT40 (TT40A& TT40B), TT41 (TT41A& TT41B) and TI8 (TI8U & TI8D). Each BIC sends its output to the master BIC. There is one EXTRACTION MASTER BIC (‘EXT2’). The master BIC applies a complicated logic to handle CNGS and LHC consistently without the need to manually mask channels. This module is the most complicated component of the beam interlock system hardware. The output signal (‘permit’) of the master BIC is send to the MKE to enable/disable extraction

47. (Un-)maskable Interlocks & Safe Beam Flag 19/06/200847 The HW interlocks may be either UNMASKABLE or MASKABLE. MASKABLE interlocks may be masked when the beam is ‘Safe’. A dedicate signal, the Safe Beam Flag (SBF) is distributed by a timing telegram to the BICs. If the SBF is TRUE, a mask is applied, when it is FALSE the masks are ignored. The SBF is: TRUE if the SPS beam intensity is < 10 12 protons FALSE if the SPS beam intensity is > 10 12 protons SBF generation: The intensity is measured by the standard SPS hadron BCT one second before the fast extraction (only when fast extraction timing is enabled !). The intensity is send to the SMP (Safe Machine Parameter) system to generate the SBF. After a maximum of 3 seconds, the SBF is reset to FALSE by the SMP.

48. Extraction Master BIC 19/06/200848 BIC module with a special logic to cope with TEDs, CNGS & LHC beams. TRUE if SPS energy 400 +- 5 GeV TRUE if SPS energy 450 +- 5 GeV TRUE if TT40 TED in beam TRUE if TI8 TED in beam TT40-A, TT40-B, TT41-A, TT41-B, TI8 Upstream, TI8 Downstream >> output of the corresponding ‘standard’ BIC modules ‘Beam flags for and from the LHC, only for LHC injection. Only active when ‘TED-in TI8’ = FALSE

49. Master Logic (for CNGS) 19/06/200849 TT40 TED IN BEAM : Only E_400, E_450, TT40A,TT40B are taken into account by the master for the interlock logic. All other inputs to the master are ignored. Either E_400 or E_450 flag must be TRUE. Extraction OK if TT40A and TT40B are TRUE, and either E_400 or E_450 is TRUE. >> Extraction of LHC/CNGS beam to TT40 TED TT40 TED OUT OF BEAM – CNGS case : E_400 is TRUE. TT40A,TT40B, TT41A,TT41B are taken into account for the interlock logic. All other inputs to the master are ignored. Extraction OK if TT40A, TT40B, TT41A and TT41B are TRUE. >> Extraction of CNGS beam to T40 >> There is a similar, but more complicated logic for the LHC beam when E_450 is TRUE.

50. HW Interlock ‘Types’ 19/06/200850 For the CNGS fast extractions there are 3 types of interlocks based on : Continuous surveillance of parameters, like (end-)switches. The associated signals change their state rather ‘rarely’. Vacuum, TEDs, target… Pre-extraction surveillance where the interlock signals are evaluated a short time BEFORE extraction. The signal is FALSE by default and switches to TRUE for a short time interval around extraction if all conditions are correct. Surveillance of the beam position around extraction point and of the PC currents. Post-extraction surveillance where the interlock signals are evaluated AFTER extraction. This type of surveillance concerns beam instrumentation. The signal is switched to TRUE for a short time around extraction. The interlock signal is latched (FALSE) at the level of the client if a measured beam parameter is out of tolerance. Beam losses and beam positions in the transfer lines. Both Pre- and Post-extraction surveillance tasks are triggered by timing events coupled to the main extraction event.

51. ‘Obstacles’ Interlocks 19/06/200851 Beam ‘obstacles’ that provide inputs to the HW interlock system: Vacuum valves: must be open. TBSE (personnel protection stopper): must be OUT of beam. TED (dump): must be IN-BEAM or OUT of beam (interlock if moving).. Decay tunnel shutter: must be open. Target: must be at a valid position. BTVs: (maskable) Positions : Al, C (OTR), Ti (OTR), Out. Should be Out by default. Only the Carbon OTR screen is allowed in beam. Al or Ti  interlock ! Interlock when moving. Last screen in front of T40 is locked in beam (C). Comment for TI2 & TT60 & TI8 : for those lines there are no C OTRs. The Ti screens are allowed in beam !

52. Misceleanous Inputs 19/06/200852 There are some rather unusual inputs to the Extraction Interlock System: TCC4 Ventilation: interlock is generated if the ventilation system of TCC4 (T40 target chamber) is in ‘Access Mode’. Hadron stop cooling: interlock is generated if the hadron stop (after muons monitors) is not cooled. Fire alarm: A fire detector for TCC4 is also in the chain… …and there is of course the BIG RED INHIBIT BUTTON, in the rack next to the MTG inhibit buttons.

53. Magnets Inputs 19/06/200853 Interlocks related to magnet surveillance: WIC (Warm magnet Interlock Control): magnet temperature surveillance interlock for TT40 and TT41 magnets (one input per TL). The WIC PVSS supervision is available from the SPS console manager (SPS Control  Equipment Control). MSE girder: this interlock signal combines the following MSE surveillance MSE cooling & temperature. MSE girder : must be in beam, not moving and within +- 2 mm of nominal position. Note that there is NO girder optimization needed for the LSS4 fast extraction. MSE PC must be ON.

54. Powering Failures 54 Powering ‘failures’ are among the most likely and most critical failures : Wrong converted setting  surveillance of the current VALUE. Converter failure  FAST surveillance of the current CHANGE/STATE. TT41 Main Bends Tol. Tolerance Examples of simulated powering failures Tolerance Reaction time ~ 2 ms Reaction time ~ 5 ms 19/06/2008

55. PC Current Surveillance 19/06/200855 The ROCS system provides a pre-extraction surveillance, the so-called FEI (Fast Extraction Interlock). The current of selected converters has to match a reference within a pre-defined tolerance. The surveillance is performed at the last possible moment ~ 2 milliseconds before extraction. This system provides in total 6 inputs to the BICs for CNGS, all inputs are MASKABLE: LSS4 bumper converters (H+V) TT41 converters TT40 converters MBI main bend converter MSE.418 converter Interlock DCCTs for shared main converter Operational current tolerances : RBIH.4100107, RBIH.400309 0.2%(dipole strings) RBI.410147/RBI.81607 0.1%(main dipole string) Interlock DCCTs1.0% RBI.410010 0.1%(switching dipole TT41-TI8) Septum MSE4180.1% Main quad strings (D/F)0.2% Matching quads0.5% Corrector magnets15  rad (20  rad for last elements) Extraction bumpers1  rad

56. PC Surveillance : Structure 19/06/200856 A selection of PCs of one crate are grouped together and associated to one input of a selected BIC: Each PC of the group has a fixed reference and a tolerance. Checking of a group is triggered by the timing events associated to the extraction. The group and its settings are identical for ALL CNGS cycles or for ALL LHC cycles: no distinction between CNGS1, CNGS2 etc users. >> simplifies the settings organization and ensures that the settings are consistent for all beams of the same type. The interlock settings are not persistent in the ROCS FECs, i.e. after a reboot the settings must be reloaded with the application !!

57. PC Surveillance Timing 19/06/200857 For each extraction, the ROCS system provides two 2 ms long pulses when interlock = TRUE which sets a strong constraint on the event sequence (minimizes possible errors). The LEGACY events that trigger the ROCS are: OEX.FINT1-CTMat -13 ms OEX.FINT201-CTMat -1 ms(wrt extraction) 2 ms pulse

58. PC Interlocks Application / 1 19/06/200858 An application using RBAC to limit access to the interlock settings is now available (but still under development !). The interlock settings are stored in files (for the moment) with a digital signature. The application automatically loads the latest settings, and saves a new reference after every change. Three access roles for settings control: MCS-SPSOP : all people on SPS shift + coordinators Can change references & ‘active status’ for steering magnets. To update settings after steering if out of tolerance + disable for target scans. MCS-SPSEXPERT : for the moment only Jorg, Verena & Karel Can change all settings and tolerances, except the settings for the special DCCTs of the main bends. MCS-SPSGURU : for the moment only Jorg & Verena Can do everything, including reading a file with a ‘corrupt’ digital signature. >> 2007 experience showed that EXPERT and GURU access is only needed for setup & commissioning periods because the PCs are stable.

59. PC Interlocks Application / 2 19/06/200859 SPS Control  Beam Interlocks  Extraction PC Interlocks Reference & tolerance in A Reference & tolerance in bits Access : NORMAL EXPERT GURU BIC input RBAC log in Most useful button !! Send all settings

60. ROCS Interlocks Application / 3 19/06/200860 Select cycle & transfer (standard LSA selection) Compare with LSA settings DB and FEI reference, difference & tolerance Import settings for selected lines

61. FMCMs 19/06/200861 The FMCM (Fast Magnet Current Change Monitor) is a device developed at DESY for HERA to detect powering failures on PCs, in particular when the current decay is very fast. The principle of the FMCM is to detect the change in voltage  V when the current decreases rather than to measure directly the change in current  I, because  I/  t is more sensitive when  I and  t are small ! 5 circuits are monitored by FMCMs: L is the circuit inductance CircuitI Nominal (A)Measured  I/I (%) Threshold  I/I (%) Specification for CNGS MSE418200150.120.2 RBIH.4001 (MBHC)6740.030.5 RBIH.4003 (MBHA)8400.010.1 RBI.410010 (MBSG)30860.020.05 RBI.410147 (MBG)39680.010.1

62. FMCM Signal Timing 19/06/200862 Large voltage changes  inhibit Large voltage changes  inhibit FMCM interlock signal The FMCM removes its interlock when the current is stable on the PC flat top. During ramp up/down the large voltage changes  interlock. On the ‘flat bottoms’ the FMCM interlocks because I is too low.  Excellent protection against attempt to extract during the ramp !!!!!!!!!!!

63. Other PC Interlocks 19/06/200863 There are 2 additional PC interlock: Horn and reflector: PCs must be ON. MSE Fast internal ‘Sum Fault’: fast internal interlock of the MSE converter. Similar to the SPS MB and MQ interlocks (to BIS in BA3). Very fast signal, delay ~ 1-3 ms.

64. Beam Position in LSS4 19/06/200864 The position of the circulating beam is checked before extraction and interlocked if not within tolerance. It is NOT latched. The settings are controlled/monitored from the Steering Application (SPSRing), menu Machine Specials, BPM interlocks. Beware: The interlock is generated by MOPOS – changing the gain for the first turn may lead to interlocks if the signals are saturated at 400 GeV !!! When the gains are changed (intensity change…) it may be necessary to RECALIBRATE the MOPOS BPMs to get correct positions !! Interlocked BPM list. Out of tolerance BPMs are highlighted in RED! Interlock settings Corrected positions (BPM non-linearity) Measured positions

65. Beam Position in TT40/TT41 19/06/200865 The interlock on the beam position in TT40/TT41 is LATCHED when out of tolerance to stop further extractions. The CNGS beam position interlock settings are controlled from the Steering application (CNGS transfer), menu Machine Specials. The latch status & reset available in the panel. The interlock settings are identically for ALL USERs (not PPM). The settings are declared as critical settings (and stored) in LSA: protected by a digital signature and RBAC logging (role MCS- BPCNGS). Authorized settings editors (as of today): Verena, Edda, Jorg

66. Post-Mortem for Trajectory 19/06/200866 The Steering appl. provides a Post-mortem freeze that is activated by default for CNGS: o Freezes the display on the last acquisition and changes the DV frame to orange. o Stores (internally) the last acquisition with beam. It is possible to monitor ALL users and use the steering as fixed display with incorporated PM. In case the BPM interlock is latched, this provides a display of the last trajectory (background color to orange). To help taking a decision, i.e. reset and continue, or stop and think !

67. Beam Loss Interlocks 19/06/200867 The BLM thresholds are the same for ALL USERs. They are declared as critical settings (same as BPMs). Authorized to change settings : ~ all people on SPS shift + SPS supervisors. RBAC role is MCS-SPSOP. The TL BLMs latch their interlocks. To reset, click there.

68. BI Interlock Timings 19/06/200868 Transfer line BPMs and BLMs LSS4 BPM Latch

69. Interlock Monitoring 19/06/200869

70. Standard Supervision 19/06/200870 The usual BIC supervision application is also available for the East Extraction Interlock System. The application is identical to the SPS ring application, and provides the same functionality (masks, status, history buffer…). But there are many very short signals for extraction interlocking, and this application is not so easy to use. Therefore…

71. Time Evolution Display 19/06/200871 Under the ‘Show View’ menu of each BIC panel, the option ‘Permit Status Tracker’ opens a graphical display of the interlocks that is refreshed for each cycle. Overall ‘impression’, but difficult to make a precise diagnostics. Warning : does not work properly (yet) for the master BIC EXT2 !!

72. Extraction Interlock Monitor 72 To ease the diagnostics of the Extraction Interlock System, special application analyses the signals and produces a simple status, OK or NOT-OK for each cycle. Console manager : ‘SPS Control’  ‘Beam Interlocks’  ‘CNGS Extraction Monitor’. Exists also for TI8. and TI2. Main screen Index of first faulty channel Interlock signal to MKE, BIC EXT2

73. Extraction Interlock Monitor : details 19/06/200873 BIC detail Time evolution of the signal A tooltip with the channel description should appear is you pass the mouse over the pads.. If the console manager does not interfere ! The green/shadowed regions indicate where the signal must be = 1 (TRUE) to be OK (and to give status = green !

74. Masks 19/06/200874 Color coding : Input OK Input not OK Input masked and OK Input masked and not OK Status of the Safe Beam Flag, TRUE  masks are applied

75. MKE LTIMs 19/06/200875 The status/arrival of the timing for the MKE can be monitored from the LTIM menu, here example of MKE6 – for each destination.

76. MKE BETS 19/06/200876 The status of the BETS (energy & voltage) can be obtained from the BETS Details menu. There is presently a problem with the BETS data for the CNGS: the LHC data is displayed instead of the CNGS data ! Will be fixed…

77. MKE Scope 19/06/200877 A remote scope is available to monitor PFN charging, BTES and BICs ! Extraction interlock permit CNGS BETS LHC BETS PFN voltage

78. 2007 Experience 19/06/200878 It was much easier than I feared !! Line and beam were stable and required very few interventions/steering. The windows on the orbit corrector currents are sufficient to give margin for a few weeks of steering. There were no problems at all with the numerous PC interlocks (including ROCS). The LSS4 beam position interlock (from MOPOS) was the trouble maker: Fake interlocks in a few % of all cycles. Issues of position reproducibility when the intensity is changed : needs careful calibration.

79. (Interlock) Experts 19/06/200879 MSE/MST/MKE : E. Carlier, B. Balhan (BT) MKE BETS : E. Carlier, N. Voumard, N. Magnin (BT) ROCS : M. Jonker (CO) FMCM : M. Zerlauth (CO) WIC : P. Dahlen (CO) RBI.816 (main dipoles) : L. de Oliveira (PO) MOPOS : S. Jackson (BI) TT41 BPMs : T. Bogey, S. Bart-Pedersen (BI) BLMs : L. Jensen (BI) Target/shutter/TED/TBSE : M. Donze, A. Masi (ATB) BICs : B. Puccio, B. Todd (CO) Interlock logic, setup, debugging, help-line : Jorg & Verena

80. It’s all there… 19/06/200880 Detailed system description Test documents & system status Settings references Trouble-shooting Sample screen shots for important information OP programs and diagnostics … For use by the expert and by OP crews ! https://cern.ch/sps-mp-operation/