6 th April 2005 Malcolm Ellis, Imperial College London 1 Sci Fi Status & KEK Test

6th April 2005 Malcolm Ellis, Imperial College London 1

Sci Fi Status & KEK Test

Malcolm Ellis, Imperial College London 2

Outline

1. KEK beamline / BESS Magnet1. KEK beamline / BESS Magnet

2 PID (TOF and ACC)2 PID (TOF and ACC)

3.SciFi Stations and Support3.SciFi Stations and Support

4. Software4. Software

Malcolm Ellis, Imperial College London 3

Beamline / Magnet

• Test of 4 SciFi stations in a 1T magnet will be carried out at the KEK 2 beamline at the end of May (26/5/05 – 2/4/05).

• There are two thin solenoid magnets available at KEK.

• Both have a field of about 1T and were designed to operate in balloon experiments.

• We will use the “Super JACEE” magnet.

Malcolm Ellis, Imperial College London 4

KEK test

Malcolm Ellis, Imperial College London 5

PID (TOF and ACC)

• PID detectors are being built and tested in Japan.

• VME Read out system is being developed in the UK (RAL/Glasgow).

• TOF– 50 ps resolution in high magnetic field– Absolute momentum measurement at low momenta

• Aerogel Cherenkov Counter (ACC)– Separate / by threshold– Separate /e from light yield

• Tests have been performed (KEK-PS T577) to establish timing resolution and PID performance

Malcolm Ellis, Imperial College London 6

TOF / separation

•Assuming• upstream =50ps• s downstream =60ps

• TOF=sqrt(50^2+60^2)=78ps

3 separation @ 600MeV/c

•Momentum resolution• ~10MeV/c @ 350MeV/c

Malcolm Ellis, Imperial College London 7

Expected ACC Light Yield

Momentum: 0.5GeV/cRefractive index: 1.03

p.e.

Malcolm Ellis, Imperial College London 8

Time Resolution

⇒σ(ref)=42.03ps 　 σ(tof)=49.08ps

ref1)}/2(tof2σ　 　 　ref2)(TOFσ　 　 　

ref1)(TOF{σ(TOF)σ

2

2

2

2

Malcolm Ellis, Imperial College London 9

PID by TOF and ACC

e

0.5Gev/c0.5Gev/c 0.6Gev/c0.6Gev/c

AC

C p

ulse

hei

ght

Time of flight

~10%

Malcolm Ellis, Imperial College London 10

SciFi Stations and Support

• The fourth station has been completed and the carbon fibre support structures are ready for final assembly.

• The completed assembly will be measured on a CMM to determine precise alignment information.

• Station connectors have been polished.

• Patch panel connectors and waveguides are currently being prepared.

Malcolm Ellis, Imperial College London 11

Carbon Fibre Support

The carbon fibre items shown were produced in the Liverpool workshop and assembled using aluminium jigs at Imperial College.

Malcolm Ellis, Imperial College London 12

Assembly Area and CMM

The area has been prepared ready to assemble the prototype tracker. It has ‘yellow’ filters on the lighting system and the door will be made ‘light tight’. Using the CMM machine we can mark the ‘mean axis’ on the outside of the tracker casing to ensure the accurate alignment of the tracker structure in the beam line.

Malcolm Ellis, Imperial College London 13

Model of Prototype

Malcolm Ellis, Imperial College London 14

Installation in the Magnet

Malcolm Ellis, Imperial College London 15

Software

• UniDAQ system will be used for the DAQ and fast online monitoring at KEK.

• Additional monitoring, based on G4MICE, will provide track reconstruction, etc.

• Aim to provide an event display as well.• Analysis of the data taken (both online and

offline) will be made using a suitably extended version of G4MICE.

• KEK test is a kind of “mini-MICE” and will thus provide many valuable lessons.

Malcolm Ellis, Imperial College London 16

Schedule

Malcolm Ellis, Imperial College London 17

Conclusions

• Test beam will be a very important milestone on the road to the final MICE trackers.

• Tracker hardware is almost complete.

• PID detectors are in development and performance looks promising.

• DAQ system and online software still require work.

• Not much time to go...