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MECO Requirements & Parameters

MECO Requirements & Parameters. NSF RSVP Baseline Review Brookhaven National Lab April 20, 2005 Michael Hebert. MECO Beam Requirements. Beam momentum = 7.5 GeV/c Two bunches in the AGS at 180  (  = 1.35  s) with 20 Tp each

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MECO Requirements & Parameters

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  1. MECO Requirements & Parameters NSF RSVP Baseline Review Brookhaven National Lab April 20, 2005 Michael Hebert

  2. MECO Beam Requirements • Beam momentum = 7.5 GeV/c • Two bunches in the AGS at 180 ( = 1.35 s) with 20 Tp each • Beam slow extracted over 0.5 s in < 50 ns wide bunches with a 1.0 s cycle time • Inter-bunch extinction ratio, 1:109 or better • Narrow focus (sradius1 mm) beam on a small cross-section target with minimal material around it • Flexibility in the steering to allow for beam on target with MECO solenoids in either polarity • At a minimum 4 ×1020 protons delivered, reaching design sensitivity could require 50% more Michael Hebert NSF RSVP Baseline Review

  3. 1.3.1 Extinction • Requirements • < 10-9 overall extinction from the combined effort of AGS Internal (in AGS WBS) and RF Modulated Magnet inter-bunch cleaning efforts. • RFMM Design Parameters • Six 1 m long modules • 740kHz operating frequency (2 modules) + two harmonics (2 modules each) • 12 MeV total kick for filled buckets with respect to unfilled (2 mrad for 8 GeV p) • 75 Gauss peak field • 6 kW total power consumption • Extinction Monitors – one near RFMM, other in p beamstop • Two 1 cm aperture spectrometers sampling a 10% momentum range of protons scattering out of beam from a flag or the production target • Small fixed field magnets out of existing inventory • TOF counters with 100 ps resolution, equivalent to 20% momentum resolution • Small scintillator-based calorimeter with 35% resolution • Detects extinction > 10-9 in 100 s of integration • For additional details see Reference Design Doc (MECO-EXT-05-001) Michael Hebert NSF RSVP Baseline Review

  4. 1.3.2 Target & Shield • Production Target (MECO-TGT-03-001) • Requirements • Minimum material around target to maximize p flux • Handle 5 kW average power (10 kW peak) heat load • 16 cm long, 6 mm dia. Au target rod, surrounded by 0.3 mm thick water layer and 0.5 mm titanium water jacket • MECO Detector costs are for design and prototyping only • Heat Shield (MECO-TGT-02-001) • Requirements – Limit heat and radiation load on PS coils • 55 metric tons of copper, 21 tons of tungsten, supported by PS cryostat • Water cooled at the OD, 16 kW average heat load to extract • Expected performance • Heat load on PS cold mass = 91 W • Maximum 21 W/g local energy deposition in superconductor • 32 Mrad integrated dose to PS coils Michael Hebert NSF RSVP Baseline Review

  5. 1.3.3 Muon Beamline • Vacuum System (MECO-MUB-03-003) • 10-4 Torr in each of two separate systems, one for PS and TSu, one for TSd and DS • 3 cryopumps, 2 turbopumps, gate valves, roughing pumps • Control system to limit Dp across pbar window to 8 psi during pumpdown • Collimators and TS Shielding (MECO-MUB-03-002) • Four collimators, 3 copper @ ~1000 kg, 1 polyethylene in TS to filter m beam • Additional copper shielding in TSu to protect cold mass from rad load • Pbar Absorbing Window (MECO-MUB-03-001) • 0.58 mm thick, 50 cm dia. Kapton window • Replaceable module in warm gap between TSu and TSd cryostats • Neutron Absorbers (MECO-MUB-03-005, MECO-MUB-05-003) • Several tons of polyethylene in and around the DS to limit neutron rates • Muon Beam Stop (MECO-MUB-03-004) • 3 tons of polyethylene, lead, and stainless steel to absorb muons that do not stop in the target foils Michael Hebert NSF RSVP Baseline Review

  6. 1.3.4 Tracker • Requirements • 900 keV FWHM energy resolution and no high E tails • Minimum material to limit multiple scattering • Operation in vacuum • High rate handling capability • Design • 13000 5 mm dia. straws arranged in 54 modules • 15 or 25 mm straw wall thickness • Single ended readout, 13000 channels • Digitizer is reworked BaBar Elefant ASIC providing TDC and ADC information, 8 channels per chip • Additional Details in MECO-TRK-05-001 Michael Hebert NSF RSVP Baseline Review

  7. 1.3.5 Calorimeter • Requirements • 7 MeV energy resolution • 1.5 cm shower impact position • Design • 1024 (3.75×3.75×12.0 cm) PbWO4 crystals arranged in four vanes of 256 crystals each • Carbon composite support structure • Each crystal is equipped with two large area Avalanche Photo-Diodes, 2048 total channels • Both the front end electronics and the crystals are cooled to -24 C • Readout electronics is in DAQ WBS • Additional Details in MECO-CAL-05-001 Michael Hebert NSF RSVP Baseline Review

  8. Requirements Single layer inefficiency of 1% Three scintillator layers to reject neutron interactions Design Profile similar to MINOS, 10cm wide, 4.6m long slats 3120 scintillator slats total, 14 km of scintillator 3 WLS fibers per slat, 44 km of WLS total 104 multi-anode PMTs, 1560 total channels Readout electronics is included in Trigger and DAQ Additional details in MECO-CRS-05-001 1.3.6 Cosmic Ray Shield Michael Hebert NSF RSVP Baseline Review

  9. 1.3.7 Trigger and DAQ • Requirements • Digitize the Calorimeter and Cosmic Ray Shield signals • Provide level 1 trigger from Calorimeter tower energies • Provide higher level processing • Handle status monitoring and slow control for all MECO Detectors • Design • 80 custom Calorimeter Digitizer Modules (CDMs) • 75 custom Cosmic Ray Shield Digitizer Modules, possibly the same as the CDMs with different firmware • Custom Event Builders • Clock Distribution System • 11 Custom Backplanes • 4 to 8 Data Servers • 56 processor CPU farm • Additional details in MECO-DAQ-05-001 Michael Hebert NSF RSVP Baseline Review

  10. 1.3.8 Simulation and Offline • Requirements • Provide detailed simulation of the detector and beamline • Handle reconstruction of event data (200 Hz L3 rate) with fast turnaround time • < 1 year to reconstruct entire dataset of 2*109 triggers • Provide higher-level monitoring of detector systems in real time through “prompt” reconstruction • Design • Hardware • Multi-CPU farm for event processing • Data storage in tape silo (e.g. PDSF @ NERSC) • Disk arrays enough to hold 25% of raw data and full DST set • Most of hardware in operating budget; MRE supports CPUs, disk, and tape for simulations, equivalent to ~1 year of operations • Software • Flexible C++ based framework based on BaBar/CDF/E158 code • Multi-level simulation, including physics processes, background mixing, detector hits and digitization, trigger acceptance • Modular reconstruction Michael Hebert NSF RSVP Baseline Review

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