Preliminary Analysis of Preliminary Analysis of HF SPE'sHF SPE's

Kadri Ozdemir (CU) ,

Kerem Cankocak (Iowa)

In the past we tookl good SPE runs, but they were almost all at HV=1250 V

For each Calibration Unit (each Quadrant) we used a different LED intensity:

ledCfgDBtag="HF_LED_SPE" HFM:Q1--> 60 AmpQ2--> 45 AmpQ3--> 45 AmpQ4--> 70 Amp

HFP:Q1--> 80 AmpQ2--> 70 AmpQ3--> 57 AmpQ4--> 79 Amp

HV @ 1250 V

HV @ 1150 V

We need lower LED amplitudes for lower HV's

Low intensity LED runs for SPE's

We need more runs with proper LED amplitude settings for 1350 V and 1150 V

Eta-Phi distribution of NPE's @ 1250 V

Avaliable HF_LED_SPE runs during 2008 for 1250 V

65046, 65052, 65053, 65055, 65056, 65332, 69079, 69081,69083

Following HF_LED_SPE runs were used in 1250V;

69079 is ref. Run

69081, 69083, 65332, 65056, 65055

As first step i obtained Number of photons and SPE

Then i calculated ratio of HF_LED_SPE ( Ratio = NPE / NPERef)

for different values of amplitude.

And try to find problematic channels for each runs.

Run 69079

1250 V

Amp. 50

1K Run 69081

1250 V

Amp. 75

1K

Run 69079

1250 V

Amp. 50

1K Run 69083

1250 V

Amp. 100

1K

Run 69079

1250 V

Amp. 50

1K Run 65322

1250 V

Amp.

HFM Q1 –>60

Q2 –>45

Q3 –>45

HFM Q1 –>80

Q2 –>70

Q3 –>57

1K

Run 69079

1250 V

Amp. 50

1K Run 69056

1250 V -1K-0.4T

Amp.HFM Q1 –>60

Q2 –>45

Q3 –>45

Q3 –>70

HFM Q1 –>80

Q2 –>70

Q3 –>57

Q4 –>79

Run 69079

1250 V

Amp. 50

1K Run 69055

1250 V -1K- 0.6T

Amp.HFM Q1 –>60

Q2 –>45

Q3 –>45

Q4 –>70

HFM Q1 –>80

Q2 –>70

Q3 –>57

Q4 –>79

todo

Analyze all the runs already taken Take more runs @1150 V and @1350 V

with optimum LED intensity for SPE's Investigate the problematic channels