MERcury Intense Target (MERIT) Experiment Installation Issues Outline Cryogenics Cryogenics Cryogenics

MERcury Intense Target (MERIT) Experiment Installation Issues Outline Cryogenics Cryogenics Cryogenics www.phwiki.com

MERcury Intense Target (MERIT) Experiment Installation Issues Outline Cryogenics Cryogenics Cryogenics

Besing, Chris, General Manager has reference to this Academic Journal, PHwiki organized this Journal MERcury Intense Target (MERIT) Experiment Installation Issues I. Efthymiopoulos ( as long as the CERN team) Thanks to: A.Fabich, H.Hasseroth, F.Haug, J.Lettry, in addition to the colleagues from the service groups at CERN Outline The experimental layout See talk by A.Fabich The cryogenics system DVB box tendering N2 exhaust line to TT10 Solenoid power supply Safety issues Access in addition to interlocks Solenoid in addition to cryogenics review Transport in addition to installation Budget See talk by A.Fabich Control room See talk by A.Fabich Schedule See talk by A.Fabich in addition to a short update on Beam parameters – pulse list Instrumentation Cryogenics Aim: Provide LN2 to cool the solenoid at 80K Readout in addition to control according to CERN st in addition to ards Guarantee safety of operations Collaboration between RAL & CERN Project engineer: F.Haug/CERN Status: System design completed including instrumentation in addition to safety valves Gas N2 exhaust line to TT10 installed

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Cryogenics F.Haug – CERN Cryogenics Specification document as long as DVB available Tendering ongoing at RAL Item on the critical path!! Procurement of other components in parallel Valves, control equipment Schedule: Test at CERN (surface) in Autumn 2006 Installation in the tunnel to follow Solenoid Power Supply Aim: Provide power as long as the solenoid: “pulsed” mode, 7kA / 30 min, 5MW Recuperate the power supply used as long as the SPS extraction to the West Area Work done by CERN/AB-PO group Status: Power supply installed in bat.193 Refurbishment started – will be completed by October 2006 AC trans as long as mer installed Associated AC circuitry refurbishment to be done as long as the 18kV cell Cabling: DC cabling {power supply – solenoid} installed 6 400 mm2 Al cables – air cooled AC cabling partially done

Solenoid power supply G.LeGedoc – AB/PO AC Trans as long as mer Power Supply in 193 building Power Supply in 193 building Safety issues New round of safety discussions in the last months MERIT Presentations in: AB Installation Committee – interface with PS/SPS AB Safety Committee ISIEC as long as m as long as the experiment Identify safety structure in addition to define safety issues Initiated reviews of all system components Started with Solenoid in addition to Cryogenics system Others have to follow Safety ISIEC Initial Safety In as long as mation as long as Experiments at CERN CERN is in as long as med about all safety particularities of MERIT MERIT Safety structure: H.Kirk & K.McDonald overall responsible as spokespersons A.Fabich as GLIMOS General Liaison in Matters of Safety In as long as mation on safety issues as long as the experiment under CERN/EDMS structure Also available from the experiment web pages: http://cern.ch/merit

Safety issues Solenoid in addition to Cryogenics Review Review held in February 2006 Review panel from CERN safety in addition to cryogenic system experts Report available http://edms.cern.ch/document/710659 Safety issues Solenoid in addition to Cryogenics Review Major remarks – to my judgment: Provide documentation as long as solenoid fabrication Including x-ray validation of the welds Proof that ASME st in addition to ards are respected And corresponding vessel validation is made Important to keep good record of the tests made in addition to findings during the MIT tests Safety valves in addition to operating pressure as long as solenoid to be defined Process flow diagram as long as the cryogenics operation should be defined Safety issues Solenoid in addition to Cryogenics Review Next steps: Provide answers to all the points raised in the report by end of May 2006 A.Fabich as GLIMOS of the experiment to collect all the in as long as mation Next reviews to schedule: Hg-loop system Transport in addition to installation in addition to inspections in-situ upon final installation

Safety issues Access in addition to interlock Access in TT2/TT2A tunnels possible when PS/SPS in operation Important to allow installation throughout summer Limited access as in other exp. areas Card reader as long as personnel access Interlock conditions defined: Access interlock: no beam magnet off ODH detection Magnet power supply interlock cryogenics system Installation issues in addition to cabling under discussion Transport & Installation Detailed look at the transport of solenoid started Passage around TT2/TT2A junction always critical Solenoid & Hg loop Beam request – pulse list Based on pulse list July 2005 http://proj-hiptarget.web.cern.ch/proj-hiptarget/default/Documents/subsystems/ProtonBeam/pulselist.xls Total dose limited to 31015 protons on target. Beam parameters: Nominal momentum 24 GeV/c Intensity/bunch – baseline: harmonic 16 (i.e. 16 buckets in PS, Dt=125ns) 2-2.51012 protons / bunch total maximum > 321012 protons/pulse Pulse length up to 20 ms possible (beyond 2 ms switch to 14 GeV/c) To be done: Define priority list MD time in 2006 assigned Set-up time in 2007 may be required to achieve the highest intensities

Beam setup as long as Cavitation Studies h16 beam operates in bunch pairs Bunch pairs located in bucket n in addition to n+1 dnexperiment = 0,2,4,6,8, 16,18,20,22,24, 32,40, 48,56, Inhomogeneous intensity distribution causes intensity limits MD dates scheduled towards the end of 2006 – profit from development of CNGS beams with similar (high) intensities PUMP: 6 bunches = 151012 protons Possible Chosen n=1 Beam profile measurement 3 Monitor types considered Based on beam properties to be measured MTV screens “almost” readily available Minor ef as long as t Minimum budget SEM-grid None available – needs new construction Costly: >50 kChF Manpower these days very little at CERN Wire scanner “Slow” measurement Baseline: MTV screens Transverse beam parameters Position & spot size MTV screens Direction 2 MTV screens & collimator Divergence not a direct measurement Rely on beam simulations Estimate from spot size monitors Longitudinal beam parameters Measured by pick-ups in the PS & TT2 line upstream of MERIT Log values in addition to make available the in as long as mation as long as the MERIT collaboration Parameters measured: Bunch length Bunch spacing Pulse length Intensity

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