1. DESY contributions to MAPS DESY testbeam
DESY Introduction
Ingrid-Maria Gregor, DESY
DESY contributions to MAPS
DESY testbeam
JRA1 Brainstorming Meeting
DESY, Hamburg
3.-4. November 2005

2. DESY contribution to MAPS
F1 group: mainly working on ZEUS, experienced in many aspects from readout to analysis
Device simulations (Uni Hamburg)
Chip tests: radioactive sources, beam-tests
Radiation studies
Power consumption and cooling studies: simulations and tests
Mechanical layout
Physics simulations: optimization of VXD design

3. Cooling and Mechanical Design
mechanical CAD design of detector
cooling test set-up with evaporative C3F8 with 600 mm capillaries
with dummy 30 mm glass plates with evaporated Al-resistors to simulate power detailed FE heat transfers simulations to understand the experimental results
need 1kW cooling for vertex detect. if no power cycling
pulsed powering test of MIMOSA- 5 (in preparation)
Ingrid-Maria Gregor, DESY Introduction

4. Beam Test Results reproducing Strasbourg results
bremsstrahlungs/conversion beam with Ee up to 6 GeV
reference telescope with 2mm resolution (multiple scattering is larger!)
cooling down to -15°C (needed for irradiated detectors)
Results: 20e noise - 790e signal (9pix)
Ingrid-Maria Gregor, DESY Introduction 20
790

5. Beam Test Results-2 Noise vs temperature:
Noise is proportional to (Ileak)1/2
20e
10e
Efficiency depends on cut on S/Nseed
and (due to multiple scattering) on
distance predicted - reconstructed
e > 99%
Charge sharing between pixels
agrees ~ with simulations
Spatial resolution << 10mm
multiple scattering !!!

6. DESY Testbeam Testbeam 24 -> 15:30
bremsstrahlungs/conversion beam with Ee up to 6 GeV
Can select beam momentum is chosen by magnet current
Rates depending on energy, metal, collimator setting and operation
Ingrid-Maria Gregor, DESY Introduction
Rates
Target
Energy
3mm Cu
1mm Cu
1 GeV
~330 Hz
~ 220Hz
2 GeV
~500 Hz
3 GeV
~1000 Hz
~660 Hz
5 GeV
6 GeV
~250 Hz
~160 Hz
Testbeam 24 -> 15:30

7. Summary We are experienced in
Ingrid-Maria Gregor, DESY Introduction
We are experienced in
Running MAPS detectors/pixel detectors
Setting up and operating testbeams/telescopes
Cooling and mechanical designs
We are interested in the integration of all the subcomponents to make a nice telescope !