1. MDT and analog FEE mass production:
PANDA Meeting, GSI/Darmstadt, December 11, 2012 G.Alexeev (for Dubna muon group) Status report and plans. Preliminary results of the prototype beam test
MDT and analog FEE mass production:
- MDT mass production workshop -> design of
reconstruction is ready
- MDT and FEE components -> contacts with
main suppliers are reestablished (we are again
welcome!)
Beam test of RSP :
- Run 2012 was successful (both , technically and scientifically)
- Data demonstrate high pattern recognition abilities of Muon System
Plans:
- Start MDT preproduction -> 2013/14 (funding ?!)
- Continue tests of prototypes at CERN - > 2013/14 (cosmic)
? (beams at CERN)

2. Preliminary results of the RS prototype beam test
Assembly of RSP (mechanics and frontend electronics)
Test/debugging with cosmic:
- DAQ -> 688 R/O channels (16%) out of 4286 total
- event samples
Beam tests at T9/PS/CERN:
- RSP mounting
- beam/trigger conditions and collected data
- event samples (0.5 – 10 GeV/c)
- preliminary plots on: wire-strip signal correlations (strip efficiency and time), timing
Plans for :
- Range System Prototype and Full Size Prototype
- Possible/desirable modifications to T9 beam line

3. Assembly of RSP Mounting of ALU support structure for FEE and cables

4. Assembly of RSP Mounting of MDT FEE (A2DB-32 cards)

5. Assembly of RSP Mounting of one fully assembled detector layer package (12 MDTs, strip board, shielding, FEE); plane # 3
Plane#3
ADB-32 cards for strip R/O

6. Assembly of RSP Cabling of digital and analog wire R/O channels (A2DB-32 and Asum-96 cards)

7. Assembly of RSP Debugging and adjustment of DAQ on cosmic; RSP is fully equipped with A2DB-32, ADB-32 , Asum-96 and QTC cards
VME/6U crate, MWDB cards
VME/9U DAQ crate
NIM/trigger crate

8. Assembly of RSP Restricted set (32 wires x 20 planes) of wire R/O is left for final DAQ configuration
Restricted set of wire R/O (32 wires x 20 planes)

9. COSMIC MUONS Trigger: S3 (20x20cm2) & S4 (60x20 cm2) on top of RSP

10. COSMIC MUONS Trigger: S3 (20x20cm2) on top & S4 (60x20 cm2) on bottom of RSP
Barrel
FRS
EC+MF

11. MDT plane efficiency vs plane # (wire threshold = 1 μA)

12. Moving of the RSP to the “turn-table”

13. RSP rotation from vertical (cosmic) to horizontal (on beam) position

14. Placement of the RSP in T9 beam zone

15. Table of conditions for written events
P[Gev/c]
Trigger
Composition
N of events
file # , Comments
Spectrum
S3*S4
cosmic
635
f39, S3 & S4 on RSP top
8375
f41,S3 on top & S4 on bottom
0.5
S1*S2
- (e,μ,π)
6575
f85, strips on
+ (e,μ,π,p)
27374
f83, strips on 1
3087
f65
S1*S2*vetoC1
+ (μ,π,p)
90 000
f68 2
3161
f80, strips on
S1*S2+Pb
1087
f81, 2.5 cm Pb brick in beam, strips on 3
11766
f77
S1*S2*C2
+ (e,μ)
3283
f78
S1*S2*C2+Pb
+ (μ)
299
f79, 2.5 cm Pb brick in beam, strips on 5
9702
f56
S1*S2*C1*C2
+ (e)
2181
f57
1217
f58
f59
6407
f69, strips on
3201
f70, strips on
13266
f71, strips on 7
11940
f75, strips on
3492
f76, strips on 10
9899
f72, strips on
1213
f73, strips on
7405
f74, beam + halo, strips on

16. BEAM: e,µ,π,p 0,5 GeV/c, trigger: S1 (Ø 11,5 cm) & S2 (Ø 3,5 cm) (here and below fired wires are given in green and strips – in blue, strip board is turned by 90 deg.) ? ? ?

17. BEAM: e,µ,π,p 1 GeV/c, trigger: S1 (Ø 11,5 cm) & S2 (Ø 3,5 cm)

18. BEAM: e,µ,π,p 3 GeV/c, trigger: S1 (Ø 11,5 cm) & S2 (Ø 3,5 cm)h h

19. BEAM: e,µ,π,p 5 GeV/c, trigger: S1 (Ø 11,5 cm) & S2 (Ø 3,5 cm)h h

20. BEAM: e,µ,π,p 7 GeV/c, trigger: S1 (Ø 11,5 cm) & S2 (Ø 3,5 cm)h h? e?

21. BEAM: e,µ,π,p 10 GeV/c, trigger: S3 & S4 (beam + halo)
halo h
halo µ ? h
halo µ
halo h

22. depending on events selection criteria:
Correlation of fired wires & strips for plane # 3 (peak corresponds to beam position)
Strip eff. = %
depending on events selection criteria:
Strip threshold = 0.4μA

23. Wire-to-strip correlation in time (for plane # 3)
STRIP time, ns ns
“Diagonal events” demonstrate full correlation of measured times for fired wires and strips. So, with fast (non-integrating) FEE for strips it is possible to assign fired strip to proper wire, thus helping to avoid “mirror” hits in plane (in help to “zero” bi-layer)

24. Correlation of fired wires & strips for plane # 3 (for ‘diagonal’ events /Δt wire/strip < 10 ns / peak corresponds to beam position practically without noise)

25. MDT drift time spectrum for perpendicular beam (main part correposnding to full efficiency takes ~ 120 nsec)

26. Minimal drift time distribution (per each event) for configuration of Forward Range System
Parameters of distribution:
<t> ~ Δt ~ 27 ns
define the minimal frequency (clock) for DAQ ~ 40 – 80 MHz

27. Minimal drift time distribution (per each event) for configuration of Barrel (=< 13 fired MDT planes per track)
Parameters of distribution:
<t> ~ Δt ~ 33 ns
define the minimal frequency (clock) for DAQ ~ 40 – 80 MHz

28. 10 GeV BEAM run F74, event #164 full event beam muon Δt ~ 1000ns
Example of two superimposed muon tracks disentangled with timing information
run F74, event #164
full event
beam muon Δt ~ 1000ns
halo muon
DAQ R/O gate ~ 1.3 µs

29. 10 GeV BEAM beam hadron Δt ~300ns halo hadron
Example of two superimposed hadrons disentangled with timing information
run F74, event #272
full event
beam hadron Δt ~300ns
halo hadron
DAQ R/O gate ~ 1.3 µs

30. 10 GeV BEAM beam muon Δt ~ 1050ns halo particle(s) ?
Example of few superimposed particles disentangled with timing information
run F74, event #560
full event
beam muon Δt ~ 1050ns
halo particle(s) ?
DAQ R/O gate ~ 1.3 µs

31. Happy end for 2012 RSP beam test !

32. R&D plans for 2013-14: * Range System Prototype:
- Tests of different screening/grounding schemes for strip R/O
- Full equipment of RSP up to 4286 total channels (+24 analog R/O)
- Tests of RSP performance on cosmic with different configurations of R/O
- Mounting of RSP back at T9 beam line
* Full Size Prototype:
- Apply results of RSP screening/grounding schemes for FSP
- Prepare FSP for running at COMPASS beam halo since 2014
* Possible/desirable modifications to T9 beam line:
- Upgrade of beam diagnostics equipment (time-of-flight, Cerenkov counters)
- Magnetic analysis of muon momenta to +/- 1% (magnet exists at PS/CERN)

33. Assumed upgrades to T9 beam line for π/μ separation < 1-2 GeV/c: S1,S2 time-of-flight scintillator counters based at ~ 20 m to each other, pressurized Cherenkov counter C3, magnetic analysis of incoming muon momenta with ~ +/- 1% accuracy

34. T9 beam particles ID C1,C2,C3 - Cherenkov gas threshold counters with
variable pressure up to 2, 3.5 and 60 bar (CO2) .
TOF time of flight plastic scintillator system (L=21.4m)
with resolution ~ 100ps (scintillator - BC408,
PMT - Hamamatsu R5946).
P[Gev/c]
0.5
1.0
1.5
2.0
2.5
3.0
≥3.5 C1 e
e+µ C2
e+µ+π C3
TOF
e,µ,π,p p