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MERIT (ntof11) experiment: Diagnostics

MERIT (ntof11) experiment: Diagnostics. A.Fabich CERN AB-ATB http://cern.ch/proj-hiptarget July 2005. Installation on beam line. Proof-of-principle test of a liquid mercury jet target for multi-MW proton beams. Target chamber. Beam attenuator. Solenoid. Mercury loop. proton beam.

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MERIT (ntof11) experiment: Diagnostics

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  1. MERIT (ntof11) experiment: Diagnostics A.Fabich CERN AB-ATB http://cern.ch/proj-hiptarget July 2005 A.Fabich, CERN AB-ATB

  2. Installation on beam line Proof-of-principle test of a liquid mercury jet target for multi-MW proton beams Target chamber Beam attenuator Solenoid Mercury loop proton beam A.Fabich, CERN AB-ATB

  3. Target chamber side view Cut view A.Fabich, CERN AB-ATB

  4. Sight Glass Primary Containment Sight Glass Cover Hg Jet Hg Supply Reflector Optics Secondary Containment OD=6.18" (157mm) Magnet Bore ID = 6.38" (162mm) Primary Containment Cross Section ~9 cm A.Fabich, CERN AB-ATB

  5. Optical Diagnostics • Shadow photography to visually observe mercury jet behaviour • tight environment • high radiation area • high magnetic field: 15 Tesla pulsed • non-serviceable area • passive components • optics only (no active electronics) • back illuminated with a single fiber laser - pulsed laser X • transmit image through flexible fiber bundle A.Fabich, CERN AB-ATB

  6. Optical Diagnostics retroreflected illumination Spherical mirror laser illumination image collection cm scale A.Fabich, CERN AB-ATB Works OK in this tight environment test target

  7. Almost all parts sufficiently radiation hard BUT the fiber: 0% transmission after exposure to MERIT equivalent Search for fiber replacement is ongoing, but alternatives to present scheme have to be investigated … Radiation hardness A.Fabich, CERN AB-ATB

  8. “Pixel detector” • What kind of pixel detectors are there? • ATLAS, CMS enviroment: radiation, B-field, … • Can we adapt such a system for our needs? A.Fabich, CERN AB-ATB

  9. B-field Solenoid temperature Proton intensity Operation Scenario • Single pulse experiment • About 150 extractions (integrated intensity < 3 1015 protons) • One extraction of up to 3*1013 protons @ 24 GeV every ~30 minutes • Proton beam properties change from pulse to pulse and repeat A.Fabich, CERN AB-ATB

  10. High Field Pulsed Solenoid • collecting device for mesons • 80 K Operation to optimize for costs • Not superconducting! • 15 T with 4.5 MW Pulsed Power • 15 cm warm bore (L=1m) • 4.5 ton Peter Titus, MIT • power cycle 15 seconds • Cooling cycle of solenoid limits to a minimum repetition time of 30 minutes between two pulses! A.Fabich, CERN AB-ATB

  11. Radiation environment Simulated neutron flux at r = 0.6 m • Radially: 10-3 n/cm2/p.o.t. • Forward: 1.2 x 10-3 n/cm2/p.o.t. • Backwards: 1.6 x 10-3 n/cm2/p.o.t. Diagnostics are located at r = 0.03 cm → 400x A test in ISOLDE (1.4 GeV) with a total of 4*1015 p.o.t. resulted in 3 kGy. At MERIT we expect more like 50-100 kGy. A.Fabich, CERN AB-ATB

  12. Diagnostic specifications • Area of “view”: 4 x 8 cm x 8 cm = 250 cm2 • Spatial resolution: ~ 0.2 mm • Shutter time: ~1 micro-second • Frame rate: 10 kHz to 1 MHz • Record time: up to 1 second • Radiation hard • Exposable to 15-Tesla field, < 50 T/m A.Fabich, CERN AB-ATB

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