Calibration of the calorimeter by punch-through muons

and cosmic muons

Doroshenko M.

E391 collaboration

Punch-through muon

0dneibourhooiE

pQBeam: muon

Punch-through muon

Crystal, ID

Crystal, ID

CsI crystall:

• 7x7x30 cm – 168 MeV

• 5x5x50 cm – 280 MeV

pQMeV /

Relative error

Gain

Cosmic muon

Cosmic trackand

guard region Azimuth angle, rad

Chi^2

Cosmic track

Charge, pQ Normalized reply,pQ/cm

Calculated path length, cm

Crystal 7x7 cm

Cosmic muon

Crystal, ID

Crystall,ID

pQMeV /

Relative error

Gain

5.63 MeV/cmGAIN= --------------- mean pQ/cm

Compare cosmic and punch-through data

Punch-throughmuongains

Cosmic gains

Timing

The delays:

• a – from PMT up to A/D card – by cosmic tracks

• b – from A/D card up to TDC – by pulser

Timing

ijji Aaa

min2

,

ji

ijji AaaS 0390 a

The signal time of a crystal in a track:

nc

dz

c

RbaTt iiiii

• T – trigger timing• R – length of the track• dz – distance from track up to PMT• c – speed of light• c/n – speed of light in CsI

+

idz

Timing

HV, volts

Time delay, ns

Conclusion

ADC calibration Good agreement between punch-through and

cosmic muon’s data

TDC calibration The cosmic muon tracking allows to estimate the

time delays between detectors The difference in the delays mainly come from the

HV settings

The E391a detector works well Calibration constants from cosmic data is a good

enough for first step study physics data calibration K0 study