1 HF CRAFT and at 4 Tesla Kerem Cankocak Ferhat Ozok, Sercan Sen HCAL DPG Meeting 17 Nov. 2008.

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Presentation transcript:

1 HF CRAFT and at 4 Tesla Kerem Cankocak Ferhat Ozok, Sercan Sen HCAL DPG Meeting 17 Nov. 2008

2 LED signals from Short fibers run (4 Tesla) / (0 Tesla)‏ RMS ratio Mean ratio ~ 20 Channels with low LED signal

3 LED signals from Long fibers ratio of the channels: run (4 T esla) / (0 Tesla)‏ Mean ratio RMS ratio

4 Run > 3.8 Tesla Run > 0 Tesla Run > 2.4 Tesla Run > 3.0 Tesla Run > 1.3 Tesla Run > 1.3 Tesla HF Raddam Channels at 3.8 Tesla Ratio S 1 /S 2 (vs phase) per Raddam Channel S1S1 S2S2 Ratio S 1 /S 2 vs phase

5 Run > 3.8 Tesla Run > 0 Tesla Run > 2.4 Tesla Run > 3.0 Tesla Run > 1.3 Tesla Run > 1.3 Tesla Run > 3.8 Tesla Run > 3.2 T Run > 0 Tesla Stability of RADDAM(B)/RADDAM(0) (≈ 1)‏

Conclusions: Fringe field at HF ROBoxes in excess to 100 Gauss Stability of LED(B)/LED(0) (≈ 1) → PMT shielding GOOD Stability of RADDAM(B)/RADDAM(0) (≈ 1) → RADDAM Fibers not damaged through B field ramp-up/down (despite alarming noises)‏ [hopefully all other HF Fibers OK also; need source data to confirm!]

Performance of HF at CRAFT Lights OFF in the cavern Lights ON in the cavern Not a clear indication of a possible Light leak; investigations continues continue

Hot channel is fixed (after CRAFT)‏ (ieta=-32, iPhi=45, depth=2). A pin inside the black signal cable between RBX's and QIE's were damaged (at the RBX's side).

Run Run CDAQ comment: FED starts to output data fragments ~4 times bigger then all others FEDs A typical HF Rechit distributionNot muons...or light leaks.. GeV

HB iEta HB iPhi DT iEta DT iPhi  Search for possible Correlation with CSC  Search for a correlation between muons and HF Rechits We have good correlation between DT and HB (or HO) but not so easy for HF

A few high energetic events are from LYSO crystals GeV 

An example of the “Crystal event” “Crystal events” are at the order of 10^ -5; mainly at LYSO crystals

Typical signals from Crystal PMT's Crystal events GeV

- HF PMT's behave well under 3.8 Tesla - Not a clear indication of light leaks in HF - few Crystal events in HF (possibly due to muons hitting PMTS) ~ 10^-5 - investigations of Muons in HF continue Conclusions