The merit experiment at the cern ps
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The MERIT experiment at the CERN PS. MOPC087 WEPP169 WEPP170. Leo Jenner. Overview. MERcury I ntense T arget Experiment Purpose of Experiment Experimental location and set-up Data Particle generation / detection Target stability Summary & Achievements.

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The MERIT experiment at the CERN PS

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The merit experiment at the cern ps

The MERIT experiment at the CERN PS

MOPC087

WEPP169

WEPP170

Leo Jenner


Overview

Overview

  • MERcuryIntense Target Experiment

  • Purpose of Experiment

  • Experimental location and set-up

  • Data

    • Particle generation / detection

    • Target stability

  • Summary & Achievements


The merit experiment at the cern ps

A proof-of-principle test of a target station suitable for a Neutrino Factory or Muon Collider source using a 24-GeV proton beam incident on a target consisting of a free mercury jet that is inside a 15-T capture solenoid magnet.

Proposal submitted to CERN – May 2004

Experiment approved as nTOF11

Participating Institutes

  • BNL, MIT, ORNL, Princeton University

  • CERN, RAL


The merit experiment at the cern ps

  • Study MHD effects on Hg-jet with normal target size and velocity

  • Study jet disruption by varying the PS spill structure

    MERIT: 180 J/g (+25°C)

    • [email protected] protons

    • 1cm diam. Hg-jet

    • 1.21.2 mm2 beam size rms


The merit experiment at the cern ps

Target

  • 1-cm diameter Hg jet, jet velocity  20m/s

  • Hg jet/proton beam configuration:

    • Hg-jet ↔ solenoid axis = 33 mrad

    • proton beam ↔ Hg-jet axis = 67 mrad

    • beam ↔ Hg-jet interaction length = ~30cm (2.1 lI)

      Proton beam

  • 24 (14) GeV/c extracted from PS

    • Max. intensity 3  1013 protons/pulse (30TP)

    • Beam spot r 1.2 mm rms

    • Variable pulse length 0.134  700 msec

    • ~100 high-intensity pulses

    • 3  1015 protons on target in total (radiation limit)


The merit experiment at the cern ps

Solenoid

Target chamber

Hg-jet hydraulic system

Hg container

Proton Beam

Viewports:

Left – 30cm – 15cm – magnetic centre – 15 cm - Right


The merit experiment at the cern ps

TT2/TT2A: MERIT

PS ring

Solenoid

Beam Dump


The merit experiment at the cern ps

IR is enclosed in solenoid to capture pions

15 T, liquid N2 cooled, copper

Interaction length optimised to reduce re-interaction

Cooling Stresses: 50MPa / 200MPa


The merit experiment at the cern ps

Simulation

Position

Hadrons

Neutrons


The merit experiment at the cern ps

Simulation: MARS

Particle Detection:

pCVD

PIN Diode

ACEM


The merit experiment at the cern ps

80 μsec/frame


The merit experiment at the cern ps

Disruption Length increases rapidly in no field

Disrupted material moves faster with no field


The merit experiment at the cern ps

14 GeV

24 GeV

  • Disruption length @ 24 GeV is about 20cm for 10-15T field

  • For a 20m/s jet, 28cm (2lI) can be renewed in 14ms

    • rep rate of 70 Hz possible

    • equivalent to 8 MW of beam power

    • neutrino factory baseline = 1 MW


The merit experiment at the cern ps

Summary

  • The break up of the Hg jet is influenced by the magnetic field.

    • The splash velocity increases as the beam intensity increases, however, magnetic field reduces the effect

    • The Hg jet disruption length is suppressed by magnetic field.

  • The 24 GeV proton beam tends to result in a longer disruption length than the 14 GeV proton beam.

  • The magnetic field stabilizes the Hg jet flow.

    • The fluctuations on the jet surface decreases as the magnetic field increases.

  • The field tends to keep the jet size constant as it moves downstream

  • The longitudinal Hg jet velocity was not affected by the magnetic field.


The merit experiment at the cern ps

  • The MERIT experiment took beam as scheduled for three weeks in autumn 2007 at CERN PS

  • All systems performed well, the run with beam was very smooth and the whole scientific program was completed

  • The experiment was dismantled in winter 2007 with its components put in temporary storage for cool-down at CERN waiting to be shipped back to US

  • The primary objective to conduct a successful and safe experiment at CERN was amply fulfilled

  • Important results validating the liquid metal target concept are already available, more to come as the analysis progresses

  • The MERIT experiment represents a big step forward in the targetry R&D for high power targets.


The merit experiment at the cern ps

References:

  • Neutrino Beams from Muon Storage Rings: Characteristics and Physics Potential, S. Geer, Fermilab-PUB-97/389

  • The MERIT High Intensity Liquid Mercury Target Experiment at the CERN PS, I.Efthymiopoulos et al, MOPC087, EPAC 08

  • The MERIT High-power Target Experiment at the CERN PS, H.G. Kirk et al, WEPP169, EPAC 08

  • A 15-T Pulsed Solenoid for a High-power Target Experiment, H.G. Kirk et al, WEPP170, EPAC 08

  • http://proj-hiptarget.web.cern.ch/proj-hiptarget/doc/ACEM_slides.ppt

  • Thesis: Development of a Beam Condition Monitor System for the Experimental Areas of the LHC Using CVD Diamond,

  • Juan Luis Fernández-Hernando

    • Chapter 9 - Simulation of the worst accident scenario with a test beam


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