minos near detector
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MINOS NEAR DETECTOR
• Status
• Plans for Installation and Commissioning
P. ShanahanFNALAlExp 11/17/03
MINOS Detectors
• 1” Fe/1cm plastic scintillator
• 4.1 cm transverse segmentation
• WLS fiber readout into multi-anode PMTs
Near Detector readout single ended
Near Detector• Smaller than Far Detector• 282 planes (153 scintillator), partial
instrumentation• 980t, 4.8m x 3.8m x 16.6m
• 1.2T magnetic fieldEvery 5th plane throughout detector is fully instrumented
Near Detector Function
First 120 planes: each plane instrumented
Last 162 planes: multiplexed spectrometer region
cm
cm
cmcm
Vetoregion
Targetregion
Calorimeterregion
SpectrometerRegion:4x multiplexing,4/5 planes not instrumented
MC
Readout Electronics
• High Rate Neutrino Experiment– >30 interactions/10s spill
• QIE based system– Multiranging, Deadtimeless 19ns
sampling over entire spill
• Electronics Assembly nearly complete
• Checkout >50% complete
Component Count (not counting ~10% spares):
9328 MENUS
583 MINDERS
81 MASTERS
Readout Boards(MASTER)
MINDERCrate
Trigger/Keeper
Front End Mother Boards(MINDERs)
Control
Read-Out Channel 0
Read-Out Channel 1
Read-Out Channel 2
Read-Out Channel 3
Read-Out Channel 4
Read-Out Channel 5
Read-Out Channel 6
Read-Out Channel 7
1818181818181818
MASTER MODULEVME Read-Out Board
Front End Crate
KEEP
ER
68
Rea
d-O
ut B
uffe
r
VME Computer
Located Near MUX BoxEach Crate Hosts 16 MINDERs
Located in Front End VME Crate
VMEBackplane
Located in Front End VME Crate
Trig
ger
VM
E In
terfa
ce
Each MINDER Module supports16 Channels, or 1/4 PMT
Each MASTER supports8 MINDERs, or 2 PMTs
VME Clock Fanout
RF ClockNUMI Interface
Tim
ing
MIN
DER
MIN
DER
MIN
DER
MIN
DER
MIN
DER
MIN
DER
MIN
DER
MIN
DER
GRD991101
To Other Crates
ReadoutCrate
QIE Daughter Board(MENU)
Near Detector Status• All ND planes ready for installation
– Staging at New Muon
– Rack assembly in progress
– Beneficial Occupancy: Jan. 31, 2004
• Integration tests: 8 spectrometer planes– Prior to B.O., test integration of planes,
fiber cables, PMTs, electronics, Light Injection
– Possibly readout with DAQ, schedule permitting
Installation
• Installation expected to start ~ 6-8 weeks after Beneficial Occupancy
• Aim for 2 planes/day– Stage from NMS to MINOS Surface
Building
– Expect O(30) weeks to complete
Practicing plane manipulation with strongback
Commissioning
• Aim to commission planes as they go in– Light leaks
– basic functioning, operational parameters of scintillator, PMT, electronics, Light Injection system
• Great experience gained at Calibration Detector at CERN
• Hope to demonstrate interactions in 1st few minutes of neutrino beam.
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