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.