1. Read-out set-up and test results
P. Salabura
on behalf of Kraków crew

2. Read-out scheme Prototype I (july 2011) in tests TRB v2 128 channels
HPTDC
Evaluation board

3. ASIC interface ASIC setting for in-beam and radioactive
source tests in 2012/2013
selected:
rising time ~40 ns,pulse duration ~ 150 ns
stable operation with tubes (no oscilations)
Installed in Kraków, Juelich
Installed also at GSI with HADES MDC-
comparison to AD8 – on going
Fe signal

4. Examples of signal: Fe-source
Preamp- saturation
Typical signal
Asic setting: reduce Pramp gain (1.) to eliminate preamp-saturation

5. Event Display (new-since 2 weeks)

6. Plateau measurements ‘ 2013
Kraków straws
January 2013

7. TOT vs charge characteristics: Fe source
Q/Q~11%
Q/Q~9%
Total charge
~ few percent resolution below 1875 V: for higher HV resolution degradation
due to Preamp saturation
TOT vs charge dependence : typical shape for quasi-Gaussian pulses

8. TOT vs Tdrift -0.9 GeV protons
September’ 2012 Juelich
Simulation: Garfield + FEE transfer
1 GeV/c miuons
130 ns
TOT [ns]
Tdrift [ns]
as expected besides second leg structure in TDrift>130 ns !!! ?
pile-up due to micro bunch structure of the beam? – I doubt it – see next slides
secondary emission from tube walls?
electronic effects : cross talk (we could not find evidence for that)

9. TOT vs Tdrift vs HV (900 MeV/c protons)
1700 V V V
T~130 ns
time direction reversed
separation between 2 structures increases with HV

10. Sr90 vs in- beam measurement
same set-ups : 2 rows of straws aligned w.r.t beam
Trigger : and between 2 scint.
(in Krakow we use similar straws)

11. Spectra from one straw Juelich: p 900 MeV HV=1800 V
Kraków: Sr90 HV=1800 V
Tot [ns]
Tdrift [ns]
Tdrift [ns]
several (>8) straws fired
At least 5 straws fired + 2 scintil.
similar second leg structure visible in sr90 case
Sr90: can not be due to pile-up

12. Spectra from one straw when 2’d fired
Juelich: p 900 MeV
second straw in the same row
Kraków: sr90
second straw in the same row
second straw in the row below
second straw in the row below

13. Correlation plots Juelich: p 900 MeV second straw in the row below
Tdrift j+1
Kraków: Sr90 second straw in
the row below
Tdrift j
j j+2
j+1

14. Further source tests are needed to understand origing of delayed signals in straw
(Gas, mixtures, HV dependence, ASIC settings?)
will be continued in Kraków
Test at GSI with MDC . FEE + TRB installed . ASIC adopted to MDC signals (faster rising and larger gain)
TOT / Charge / position resolution from in-beam data– see Jacek talk