D. Attié, P. Colas, K. Fujii,T. Matsuda, M. Riallot, A. Sugiyama, W. Wang Thanks to

D. Attié, P. Colas, K. Fujii,T. Matsuda,

M. Riallot, A. Sugiyama, W. WangThanks to

M. Dixit, Yun-Ha Shin, S. Turnbull,Yulan Li

Construction and tests of a Micromegas TPC endplate

prototype for the LC

1

Large prototype TPCNeed to make a large prototype to:

Study gases and detector design (both GEM and Micromegas)

Assess technical issues : integration, operability, stability,… at a realistic scale

Since December 2008 we test Micromegas+ resistive foil and GEM modules at the EUDET facility. PCMAG improvement in AIDA.

Theoretical understanding of the point resolution. Present step : study of gain fluctuations.

Electronics developmentsIntegrationPower pulsing

Software developmentsJune 15, 2010 P. Colas, K. Fujii - D-RD2 2

June 15, 2010 P. Colas, K. Fujii - D-RD2 3

Large TPC Prototype for ILC

French-Canadian team : one module was installed in the centre of the large TPC each time. Read out by T2K electronics

Asian+Lund team : 3 GEM modules readout by ALTRO electronics


Large TPC Prototype for ILC

ALTRO readout electronics

Cooling duct

Micromegas GEM


Resistive ink~2(?) MΩ/□

Resistive Kapton~5 MΩ/□ Standard

2 Resistive Kapton~3 MΩ/□

GEM

Detector Modules

GEM

Beijing, 30/03/2010 P. Colas - FJPPL-FCPPL-LCTPC Analysis meeting

6


Preliminary Data Analysis Results ( B=1T )

PRF(Pad Response Functions) for GEMs, z ~ 20 cm

20cm drift



PRF(Pad Response Functions) fits, z ~ 5 cm

B=1T data : comparison of resistive ink and Carbon-loaded Kapton

Γ ~ 4 mmδ ~ 14 mm

Γ ~ 2.6 mmδ ~ 10 mm



Position residuals xrow-xtrack


Z=5cm

Z=35cm

Z=50cm

Mean Residual vs Row Number

Z-independent distortions

Distortions up to 50 microns for resistive paint (blue points)

Rms 7 microns for CLK film (red points)



Preliminary Data Analysis Results ( B=1T )R

esol

utio

n at

z=

5cm

(µ

m)

Vmesh (V)

Dependence of resolution with data taking conditions


Drift velocity measurements ( B=0T )

Vdrift = 7.698 +- 0.040 cm/µs

at E=230 V/cm

(Magboltz : 7.583+-0.025(gas comp.))

The difference is 1.5+-0.6 %


Drift velocity measurements ( B=0T )

Drift Velocity in Ar/CF4/Iso butane : 95/3/2 compared with Magboltz simulations for - P=1035 hPa, - T=19°C - 35 ppm H20


Data Analysis Results (B=0T)

Module_4 Module_5

Resolution as a function of drift distance. Modules 4 and 5 are identical, except the routing and PCB technique

eff

d

N

zC

220

/ NDOF = 10.6 /10 / NDOF = 13.9 /10

2% uncertainty on Cd : ±1.4 on Neff


eff

d

N

zC

220


Module_INKModule_CLK

Resolution as a function of drift distance

/ NDOF = 29.1 /11 / NDOF = 38.5 /10


Uncertainties :Use CD=94.2 ±1.8 at B=1Tand B field (± 0.02 T) ->±1.6

Resistive ink very non-uniform. All Carbon-loaded kapton very consistent : average them

Neff = 38 ± 2

Expected : Neff = 47.7 * <G>2 / <G2>

This implies rather low gain fluctuations.

Small pads (1 x 4 mm) for high double-track separation and high resolution: Thin endplate for PFA (15% radiation length + low voltage power cables)

Light mechanical structure of TPC endplate (Cornel/Saclay/DESY) High density readout electronics S-ALTRO for MPGD detectors

(CERN/Saclay/Lund/TPC Japan)

ALICE TPC (LHC) LC (ILD) TPC

(a) Development of S-ALTRO:A 64ch analog-digital mixed chip

mount directly on the backside of pad plane of MPGD detector.

(b) Issues of power switching, power delivery and cooling (2P-

CO2) (c) Issue of mechanical stability in high

magnetic field

( )a A 16ch S-ALTRO prototype in fall 2010 (CERN)

( )b A test board with ADC/FPGA in preparation

One of 12 sections of the test board (TPC

Japan/CERN)

(c) A test module (Bulk MicroMEGAS) in preparation

to be tested in DESY 5T magnet (Scalay)

Advanced TPC endplate (2010-2012)

June 15, 2010 17P. Colas, K. Fujii - D-RD2

Goal: Fully equip 7 modules with more integrated electronics, still based on the T2K AFTER chip: use naked Silicon, wire-bounded on small cards, ADC on the mezzanine, remove/optimize protections,…

First prototype basically ready, tests at fall 2010

Then production and characterization of 9 modules in 2011 at the CERN T2K clean room


NEW ELECTRONICS – FLAT ON THE BACK OF THE MODULE

Intermediate step : new T2K electronics


New T2K Electronics

♦ Backend ready. Gain of factors of 2 in evt rate and thruput

♦ 2 Mezzanine prototypes under test

♦ FECs : in the process of choosing between tenders. More complicated, but no show stopper

♦ Detector PCB ready to be ordered, process under study


Two packages being developed in the FJPPL activities

1) Topological track finding + kalman filter based track fitting 2) Combinatorial Kalman filter in which track finding and fitting proceed simultaneously

Current Status : test beam data with different readout modules have been analyzed with different tracking programs developed independently by different groups.

Desired Environment A common tracking framework (MarlinTPC) to compare different readout technologies on

the same software test bench. In order to realize this we need the implementation of

a) multi-module handling b) non-uniform B field The developed software is to be fed back to the LC-TPC tracking.

Common TrackingCommon Tracking

Hits

Hits

Tracks

Tracks

Set of Hits

Set of Hits

Set of Tracks

Set of Tracks

Set of Track Param. Vectors

Set of Track Param. Vectors

Tracking = Track Finding x Track FittingTracking = Track Finding x Track Fitting

• Multi-module handling: almost finished

• Non-uniform B field under development

Hit MakingHit Making

Set of Pulses

Set of Pulses

Read

ou

t Tech

nolo

gy

Dep

en

den

t H

it P

oin

t M

akin

g

Read

ou

t Tech

nolo

gy

Dep

en

den

t H

it P

oin

t M

akin

g

Track = subset of hits

Track = subset of hits


Tracking Software development

PCMAGOriginally built for a balloon experiment

Used in TPC small prototype beam tests at KEK/PS in 2004-2006.Being used for LC TPC Large Prototype beam test at DESY (LC TPC/EUDET).

Open solenoid of 1T.Thin coil and cryostat (20% radiation length).Require 1,000L Liq. He for an initial cooling and ～ 200L in a refilling for 6-7 days

Modified PCMAG with 4K GM refrigerators

PCMAG at DESY with GEM/ALTRO TPC Modification funded in AIDASafe/easy operation by TPC R&D groups.Portability to any beams lines in the worldSave Liquid He cost

Remove Liq. He reservoirAdd two 4KGM refrigeratorsSchedule: in 2011 (6

months)

(Thanks for full cooperation sof the KEK cryogenic

group and Toshiba)


SC solenoid modification


Conclusions and outlook

♦ Since 2005, common analysis work led to deep understanding of the resolution of a GEM or a Micromegas.

♦ Next steps: 7 Micromegas modules to fully equip the present endplate and work on improvement of the common testing facility, endplate, electronics and multi-module software.


Documents

D. Attié, P. Colas, K. Fujii,T. Matsuda, M. Riallot, A. Sugiyama, W. Wang Thanks to