Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 1

Beam Characterization with the TOFs

Mark Rayner

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 2

Saturday 13th December Shiftrun # 850 - 854 855 856 - 858 860 865 - 871

pions protons positrons

D2 MeV/c 431 490 130 200 various?

TOF0 MeV/c 420 417 100 150

current Q1 91.8 101.2 25.5 37.4 various?

A Q2 168 185.1 46.5 68.2

Q3 102.8 113 28.3 41.6

D1 345.6 390.4 89.7 130

D2 158.5 171.1 43.6 63.5

Q4 283.7 299.9 72.6 107.8

Q5 380 398.4 96.2 143

Q6 252.1 262.1 63 93.9

Q7 263.4 0 38.4 63.1

Q8 398.8 0 57.7 95.1

Q9 340.9 0 48.8 80.6

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 3

Pions from 13th December

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 4

Positrons from 13th December

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 5

Cable Length Calibration (0,1)

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 6

Cable Length Calibration (0,0)

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 7

Cable Length Calibration (1,0)

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 8

Cable Length Calibration (1,1)

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 9

TOF0—TOF1

Time of flight (ns)

calibration…Mean=8m/30cm ns – t

various p, >200, =1 150ps resolutionneed timewalk correction (and more data!)

e+

‘420MeV/c +’

Transverse momentum (MeV/c)

p=30MeV/c

mainly muonsamplitude 15.2sigma 157ps

mainly pionsamplitude 50.0sigma 196ps

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 10

TOF & Momentum

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 11

Pion trace space fits before amplitude cuts

TOF0 x (mm)

TOF1 x (mm) TOF1 y (mm)

TOF0 y (mm)T

OF

0 dx

/dz

TO

F1

dx/d

z

TO

F1

dy/d

zT

OF

0 dy

/dz

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 12

TOF0 x (mm)

TOF1 x (mm) TOF1 y (mm)

TOF0 y (mm)

TO

F0

dx/

dzT

OF

1 d

x/dz

TO

F1

dy/

dzT

OF

0 d

y/dz

Muon trace space

Analysis Meeting 27 Jan 09 Beam Characterization with TOFs 13

Work in Progress● Apply amplitude cut on calculation of , , , ● Repeat process for muons● Attempt to narrow and time of flight peaks

■ Try to use both TOF0 planes

■ Add time-walk calibration

● Error analysis● Monte Carlo to check decay kinematics● Take into account emittance growth in the Cherenkov