beam test of bgo crystal yunlong zhang 2009.12.8

Beam Test of BGO Crystal

Yunlong Zhang 2009.12.8

CSR

RIBLL

Test counter here

The configuration of beam elements and test counter

beam

TofT2-Si BGO counter

In order to extend the dynamic range of readout, we use multi-readout from the dynodes.

10k 10k10k 10k

300k 300k 300k 300k

Dy8 Dy9 Dy10 A

1R=300K, I=0.256mA at HV=1000V; 0.256W power dissipation

Readout of PMT

Data collection

Ady10Dy9dy8

Enengy signals

Time signals ACFD GG

A

dy8

Peak ADC

22Na gamma calibration:

CAEN568LC

Philip7164

The spectrum of 22Na under -1100V.

1000V Na22

1100V Na22

Fit function:

proton kinetic enengies(MeV)

(Bρ)D3=(Bρ)D4 Tm

expected

(Bρ)D3=(Bρ)D4 Tm

experiment sets

10 0.4399 0.4399

12 0.5043 0.5044

14 0.5450 0.5452

16 0.5829 0.5827

18 0.61858 0.6186

20 0.6524 0.6526

24 0.7154 0.7156

28 0.7735 0.7738

32 0.8278 0.8283

mixtue beam 1.6232 1.6625

Beam particles selection

Test with proton beam

Ady10Dy9dy8

Enengy signals

Time signals ACFD GG

A

dy8

Peak ADC

T2-SI

ORT142

ORT450

CAEN568LC

ORTlogic

enengy signals to Peak ADC

Philip744

Philip7164

Delta E vs E

Tp=14MeV

Without Si-∆E correction

T2-Si 280μm

7μm-Al foil

TOF

10μm

T2-Si 280μm

7μm-Al foil

With T2-Si ∆E correction

We have to understand why the ratio between the -odes is energydependence?

T2-Si 280μm

7μm-Al foil

TOF

10μm

Fit function:Fit function:

L = a+b*x

Saturation of fluorescence?

Thanks