1. Requirements for the Interlock System of the Phase1 beam line Janet Schmidt on behalf of CP3

2. 2 Functional scheme of main laser lines 2 LSSP1, LSSP2, LSSE1, LSSE2 – Laser Safety Shutters for proton and electron beam lines LBDP1, LBDP2, LBDP3 – Laser Beam Dumps for proton beam line MP1- MP5 – Mirrors for proton beam lines (IN VACUUM) ME1- ME4 – Mirrors for electron beam line VP1 – VP5, VE1 – Vacuum vessels for proton and electron lines Photoinjector LSSE2 VE1 LSSE1 ME1ME2 ME3 ME4 THG Delay line CERN Naming of shutters and dumps LSSP1 = TOSWB – in air LSSP2 = TOSWA in vac LSSE1 = TOSWB – in air LSSE2 = TOSWB – in air LBDP1 = TODWA in vac LBDP2 = TODWB in vac LBDP3 = TODWC in vac

3. BTVs F LSSP2 LBDP1 LBDP2 B2 B1 B4 B3 F = Movable Filter with end switch Laser dumps LBDP3 Layout of Beam Lines

4. TRUTH Table For LASER LASER TO LINELSSP2OUT V LOW POWER (default)FIN DiagnosticsLBDP1INOUTINOUT LBDP2OUT IN B1IN/OUT B2IN/OUT B3IN/OUT B4IN/OUT FULL POWER (by request)FOUT DiagnosticsLBDP1INOUTINOUT LBDP2OUT IN B1IN/OUTOUTIN/OUTOUT B2IN/OUTOUTIN/OUT B3IN/OUTOUTIN/OUT B4IN/OUTOUTIN/OUT TypeName F Filter / Indicator for Laser Power (tbd) To be defined LSSP2Laser ShutterTOSWA.420255 LBDP1Laser Dump upstream plasmaTODWA.412322 LBDP2Laser Dump downstream plasmaTODWB.412424 LBDP3Laser Dump downstream plasmaTODWC.412443 VValves (CERN + MPP) VVGS.420306, VVGS.412354, VVGS.412424, 6x MPP B12 Screens upstream plasmaBTV.412350, BTV.412353 B21 Screen downstream plasmaBTV.412426 B3Diagnostic MPP B41 Screen (SMI diagnostic CERN)BTV.412442 Local System B2 LBDP2 B4 Plasma LBDP1 LSSP2 LBDP3

5. Commissioning and Operational Modes For LASER ModeLaser PowerLaser ShutterLaser DumpScreens Set up only laserLow/HighLSSP2 IN LBDP1, LBDP2, LBDP3 IN/OUTB1, B2, B3, B4IN/OUT Set up laser beam in TT41 LowLSSP2 OUT LBDP1, LBDP2 LBDP3 IN/OUT IN B1, B2, B3, B4 IN/OUT HighLSSP2 OUT LBDP1 LBDP2,LBDP3 IN IN/OUT B1, B2, B3, B4IN/OUT Set up protons and laser LowLSSP2 OUT LBDP1 LBDP2 LBDP3 OUT IN/OUT IN B1, B2 B3, B4 IN IN/OUT Operation Phase 1HighLSSP2 OUT LBDP1 LBDP2 LBDP3 OUT IN OUT B1, B2 B3, B4 OUT IN/OUT IN Operation Phase 2HighLSSP2 OUT LBDP1 LBDP2 LBDP3 OUT IN B1, B2 B3, B4 Electron spectrometer OUT IN Local System B2 LBDP2 B4 Plasma LBDP1 LSSP2 LBDP3

6. TRUTH Table For Protons Permit this SPS extraction statusname Valves (8)outCERN: VVGS.412354, VVGS.412424 outMPP valves/plunger: 6 Laser dump LBDP1 (1)outTOSWA.420255 SPS BIC Permit next SPS extraction statusname BPMs around laser mergingOKBPM.412311, BPM.412319 BPMs before plasma cellOKBPM.412339, BPM.412352 BLM at laser mergingOKBLM.412356 BLM around plasma cellOKBLM.412356, BLM.412424 4x valve

7. Summary The laser interlock system should be a local system, checking the status of screens and valves according to the laser power and shutter status. The required interlocks for the proton line are defined, including BMPs, BLMs and valves. For the electron transfer line, only the valve needs to be interlocked. Requirements of the source will be defined on a later stage.