Test beam 2001 Results Test beam 2001 Results

M.C. Fouz

Muon Week, CERN Nov 01

Few comments about T0´s

Results with CAEN TDCs and with the final ROB

Drift velocity Resolution Efficiency

A first look at the 25ns LHC beam-like data

All results are preliminary

SL1 C27

SL2 C26

SL C20

336ns

335ns 335ns

335ns333.3ns

335.8ns 335ns

335ns336.9ns

338.8ns343.8ns

342.5ns

In SL : Differences of ~6ns between L1,L3 and L2,L4??

SL1 C27

SL C20

The 6ns T0r difference for SL between L1,L3 and L2,L4 is not “real”. It must be related with the TP system. (1 TP connector for L2,L4 the other one for L1,L3) A global T0 per Layer required

SL Vd (m/ns) 55.1 54.9 55.0Resol (m) 219 243 209

SL Vd (m/ns) 55.3 55.4 55.1Resol (m) 217 254 219

ROB

1 2

SL’s 1 and 2 :

All < MT > values inside of + 1ns

SL :

<MT1> ~ < MT2> < MT > difference of ~5ns between left and right

Resolution (left or right) = ~200 m

Global shift between L1,L3 and L2,L4 ~ 140 m

40.75 + ( 235.5 x 0.0067) = 42.3 mm

Nominal Value: 42 mm

Shift respect to nominal ~ 300 m (inside tolerances)

Eff=4L/(3L+4L) (For the central part of the cell)

L1 L2 L3 L4

99.7 99.6 99.8 99.7

99.7 99.7 99.7 99.7

99.6 99.7 99.7 99.7

L1 L2 L3 L4

99.5 99.6 99.7 99.6

99.7 99.7 99.5 99.7

99.7 99.7 99.6 99.8

ROROBB

Efficiency > 99.5 %

Selection of events with good track (4L) on and And looking for track (3 or 4 L) on .

Beam postion on :

Eff= 97 %Eff= 92 %

There is about 5 % of events lost on CAEN data

L1 L2 L3 L4

99.5 99.5 99.6 99.6

99.6 99.7 99.5 99.7

99.7 99.7 99.6 99.7

’’s ABS:10)s ABS:10)

Efficiency :

Resolution: not 217 m (217 m) 258 m (254 m) 229 m (217 m)

Not degradation on resolution

25ns LHC beam-like)25ns LHC beam-like)

In a first look the values of

resolution, drift velocity and efficiency resolution, drift velocity and efficiency

(computed as L4/(L4+L3))

Are compatibles with the previous one.

Time

Hits Trig2

Trig 1 Trig 2

Overlaping of events:Overlaping of events:

The TDC is recording hits all the time.

Trigger time is recorded in an dedicate TDC channel

When a trigger arrives a window is open looking for hits.

Time window is bigger than the maximum drift velocity and thereforebigger than the time between triggers.

For each muon trigger given by the scintillators, we will have ALL the hits associated to this muon, and perhaps SEVERAL hits associated to the Previous/next muon

Hits Trig1

25ns LHC beam-like)25ns LHC beam-like)

25ns)25ns)Event N:

Trigger chan: 2 hits found:

Time1=280ns Time2=430

Hits Found:

Cell Time Tim- Time- -T0G

RAW TC40L1 -Ttrigger C40L1 264.1 0 122.4 C40L3 275.8 11.8 134.1 C40L4 383.6 119.5 241.8 C40L2 388.2 124.2 246.6 C42L4 454.7 190.6 313.0 C42L2 450 185.9 308.3 C41L3 525.9 261.7 384.1 C41L1 508.6 244.5 366.9

Trigger chan: 2 hits found:

Time1=130ns Time2=280

Hits Found:

Cell Time Tim- Time- -T0G

RAW TC40L1 -Ttrigger C40L1 114.1 0 -27.6 C40L3 125.8 11.8 -15.9 C40L4 233.6 119.5 91.0 C40L2 238.2 124.2 96.6 C42L4 304.7 190.6 163.0 C42L2 300.0 185.9 158.3 C41L3 375.9 261.7 234.1 C41L1 358.6 244.5 216.9 C42L4 625.0 510.9 483.3

Event N+1:

(T1+T2+T3+T4)/2 = 373(T1+T2+T3+T4)/2 = 686 (T1+T2+T3+T4)/2 = 72

(T1+T2+T3+T4)/2 = 386

passing through Cells 40 must correspond to the event N passing through Cells 41-42 must correspond to the event N+1The additional hit on C42L4 appears on the event N+2 correspond tothe next trigger

Chan Chan

Chan

(1/0

.2)H

z

(1/0

.2)H

z(1

/0.2

)Hz

NO ABS100

ABS5

RPC OFF

No : 50Hz 0.05 Hz/cm2

(~2xISR value)

ABS100: 2.5 Hz/cm2

ABS5 : 45 Hz/cm2

Preliminary results from the analysis of the testbeam data shows a good performance of the MB2chamber at GIF.

ROB electronics has been tested and validated