MICE Tracker Electronics Update

Progress towards a tracker test at KEK

Status: VLPC System

The VLPC system is complete and operating to spec

Can easily control to the 9K spec.

With heaters off T=5.3K

Uses a Sumitomo SRDK-415D Cryo-cooler.

This is the unit we plan to use throughout MICE

Status: Cryo System

Full Commissioning done – Performance To Spec!!!

Operating period #1March 30

#2April 11

#3April 22

#4April 28

Design Values

Stage 1 lowest 55 K 47 K 41 K 47 K 45 Kelvin

Stage 1 heat load 50 Watts 45 Watts 38 Watts 55 W 50 Watts

Stage 2 lowest 14 K 7.9 K 7.2 K 5.3 K 5.5 Kelvin

Stage 2 heat load 22 Watts 10 Watts 7 Watts 3 to 4 W 3 Watts

Slot 1, Cass#105 ? 20.7 K 16.8 K 7.5 K 8 Kelvin

Slot 2, Cass#111 ? 20 K 23.7 7.1 K 8 Kelvin

Cryo Gas System

Status: Cryo System

However, we did have problems with the thermal links in the cryostat as you know.

Thermal contact was unreliable

Gaps lead to vacuum space and, of course, provided VERY GOOD insulation

This was corrected with the addition of In wire compressed between the Invar box and the clamps

Status: Cryo System

We have updated the design (Russ Rucinski and Michael Sarychev

Provides positive clamping!

Status: Cryo System

Status: Cryo System

So our plan is to do a full interation of the cryostat design and be ready for production of the second system late Fall

Thermal clamp redesign Address top-plate flatness

Top plate was not quite as flat as we would like. VLPC cassette seal leaked slightly and non-standard gaskets had to be used. Sealed well, but not overly elegant

Simplify G-10 backing plates Increase can diameter by 2 cm

Status:Electronics

The system will use 4 AFE II boards from D0. These are now working

512 chADCDiscrim.TDC in nextversion

Status Electronics

6 AFE II boards have now been fully tested and are available to MICE

All Channels tested Temperature and bias control operation LVDS readout functional

Still need to run the boards through the temperature and bias control calibration test stands

Things still to do

Test readout of 4 boards through VSLB to VME Calibrate the two VLPC cassettes with LED pulser

Noise Gain Dead channel count

Implement replacement board for sequencer control (readout controller)

This will allow for much more efficient asynchronous triggering

Test trigger Cosmic ray test with tracker at Fermilab

THE TRACKER HAS ARRIVED AT FERMILAB!

Timescale

Next two weeks Get 4 board readout working Get sequencer controller replacement working

July 18-22 Calibrate VLPC Cassettes

July 25-29 Cosmic Ray Test

August 1 Pack and Ship to KEK

August 8-12 Preliminary setup and shakeout at KEK

At least operate VLPC cryo

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