Tracker technology for MICE

Report of a referee … one year later

Gh. Grégoire

RAL, October 28, 2004

• Comments on the TPG

• Comments on the SciFi

• Recommendation

• Conclusion

About the TPG

The performances and quality are really impressive despite the fact that there was no special tuning (gain equalization, calibration, …)

For example • Quality of the hexaboard

Full size prototype covering the whole bore of the solenoid

• U, V, W correlations as a tool for tracking

• Tracking capabilities and potential resolution

Still a lot of space for improvements (electronics, signal conditioning,…) !

Quality of the hexaboard

E. Radicioni

U-V-W correlations

E. Radicioni

Tracking

E. Radicioni

U+V vs. W resolution

~40µm

About the SciFi

Fully designed prototype including most construction details:

Scintillator (concentration of dopant,…)

Construction of the stations (CF supports, optical connectors,…)

Measurement of light yield

No operational assembly yet

Very impressive software and simulation work performed

Predictions of the various resolutions and 4D emittance

RF background, beam simulation, reconstruction,…

« Everything » summarized in the performance table !

Performance summary

 

9.23t’ (x10-3)

4.59Y’ (mrad)

4.39X’ (mrad)

9.40PZ (MeV/c)

6.11PT (MeV/c)

0.69Y (mm)

0.81X (mm)

% RMS/RMS (with RF) 4D Emittance (with RF)

Bias = - 0.0014

= 6 x 10-2 %

M. Ellis et al

But obtained at a very large emittance !

Recommendations

2. « The TPG is still a potential backup/upgrade solution. It remains an important R&D activity of MICE and it must be brought to full completion. »

(Referee’s report 2003)

The TPG is certainly a potential backup solution and is probably near to become an upgrade solution.

It remains an important R&D activity of MICE and it must be brought to full completion.

1. I see no point in changing the present SciFi baseline option.

But there is a lot of debate about obtaining the specified resolutions on pT and pZ in all conditions of operation and at the equilibrium emittance.

Many aspects • Unanimously agreed definition of emittance

• Understanding the bias in the predicted transverse emittance

• Resolution of the longitudinal emittance

Consequences ?

• Predict resolution at equilibrium emittance

Conclusion

« 3. Independently of our recommendation, the work presently going on for both options should be completed. It should fully address the questions and issues raised in the reference document and during this meeting. » (Referee’s report 2003)

More than ever