February 8th, 2001

Status Report: SciFi for MICE

Edward McKigney

Imperial College London

February 8th, 2001

Overview

• Data Taking Cycle for MICE

• RF Background estimate for MICE

• MuScat Detectors

• Baseline MICE Tracking Detectors

February 8th, 2001

Data Taking Cycle

One Muon/Pulse• Governed by machine

and RF rep rate (max 50 Hz)

• Effectively about 15 Hz to eliminate occupancy problems

• 106 events in 18 hours• May be stability issues

Multiple Muons/Pulse• Same as One

Muon/pulse + RF flattop, detector response and DAQ buffering

• Should be able to gain at least a factor of 100 over One Muon/Pulse

February 8th, 2001

X-ray Background

100

1000

10000

100000

3 4 5 6 7[MV/m]

[counts

/100 c

ycle

s]

no plastic

1,75"

2,75"

no plastic, 1,25T

1,75", 1,25T

2,75", 1,25T

no plastic, 2,5T

1,75", 2,5T

2,75", 2,5T

no plastic, 0,625T

1,75", 0,625T

2,75", 0,625T

no plastic, 0,3125T

1,75", 0,3125T

2,75", 0,3125T

February 8th, 2001

Background Estimate for MICE

• The fiber data used a single 1 mm diameter round fiber 10 cm long

• MICE baseline is 0.5 mm diameter by 30 cm

• Rate is like diameter2

• Assume 1000 fibers per layer and a tolerance of 1 extra hit per layer in a 50 ns window. Tolerable noise rate is about 20 kHz per fiber

• Can tolerate roughly 4 MV/m, from our measurements

February 8th, 2001

The MuScat Experiment

February 8th, 2001

Scintillating Fiber Tracker

• Three planes of 1 mm diameter fibers (x and y)

• Position resolution of about 200 microns

• Efficiency greater than 95%

February 8th, 2001

MuScat Test Beam

• Data taken using the HEP test beam at RAL

• mixed pion and muon beam at 260 MeV/c

• Measured efficiency for one doublet layer was 93.6 0.5(stat.)%

• This was the first plane made, we expect improvement

February 8th, 2001

Photo-electron distribution

February 8th, 2001

MICE Detector Parameters

• 30 cm radius active area

• 0.4% X0 thickness

• High Efficiency• Position resolution of

better than 200 m• Capability to handle x-

ray background rates

• Capability to survive RF induced radiation damage

February 8th, 2001

Recent Developments

• C. Perry from Oxford has investigated building a simple front end to read out PMTs or HPDs for use with MICE

• Based on a simple comparator, time above threshold pulse height measurement and FPGA for buffering; USB for readout

• Dominant cost is for PMTs

February 8th, 2001

Conclusions• A burst type DAQ seems the best solution for

reading out the detectors• First indication is that backgrounds can be

controlled by keeping the accelerating gradient relatively low, but much more work is needed

• More work has gone into studying readout electronics and options, but efficiency and cost point to use of VLPCs