1 / 13

Integration meeting

Integration meeting. Electronics PMT Rock background Calibration system. Electronics(Dr. Oh). FADC(NOTICE) vs QADC(SK). Throughput for QADC 250Hz X 200 hits / 500 channels = 100 hits / sec / channel. 100 Hz ( signal ) + 5kHz (dark) : = ~ 0.04 MB/s per channel

tameka
Download Presentation

Integration meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Integration meeting • Electronics • PMT • Rock background • Calibration system

  2. Electronics(Dr. Oh) • FADC(NOTICE) vs QADC(SK)

  3. Throughput for QADC • 250Hz X 200 hits / 500 channels = 100 hits / sec / channel 100 Hz ( signal ) + 5kHz (dark) : = ~ 0.04 MB/s per channel = ~0.96 MB/s per board = 20MB/s for 500 channels (Without any trigger) • Throughput for FADC • 250Hz X 200 hits / 500 channels = 100 hits / sec / channel 100 Hz ( signal ) : = ~ 0.02 KB/s per channel = ~ 0.16 MB/s per board = 10MB/s for 500 channels (Hardware trigger applied)

  4. DAQ Configuration • - Data transfer rate of SATA HDD : ~78MB/s • Data throughput of one Q-bee board(24channel) = 0.04MB/s*24 = 0.94MB/s - 1 DAQ PC’s HDD is under writing (data keeping) and reading(trigger & reconstruction) So, ~30MB/s for writing is enough. 1 DAQ PC can accept 30 Q-bee boards(24*30 = 720 channels) In real configuration , 2 DAQ PCs are enough . -- 1 PC for 250 channels ( = 11 Q-bee boards ) * 500 GB HDD can store ~13.8 hour’s raw data of 250 channels / 1 PC *

  5. PMT tests (Dr. Ma) • Gain vs Temp. • Gain increases slightly as temp down. • Dark current vs Temp. • Dark current depends strongly on the temp. if dark-state keeping time is short and mildly on temp after long time in dark-state. • Afterpulse measurement. • Afterpulse occurs mainly at 2 & 7 microsecond for all 8 & 10 inch pmts. • Afterpulse vs temp.

  6. Comparison between pmts

  7. How to decide. • We have data for only one pmt for each model. • Need to get price.

  8. Rock radioactivity(W. Kang) • Rock samples can be accurately measured by HPGe detector. • Normal ICP-MS measurement is compared.  ICP-MS is not reliable in absolute value. • Results • U: 0.5-0.8 ppm, Th: 1.5-4ppm • Need reestimation of background rate. Chongpyung underground sample (ICP-MS) 4.8 +/-1.8 ppm(U), 6.0+/-2.2 ppm(Th) 4.0ppm(K40)

  9. Light Calibration(Dr. Stepanyan) • Need to have a light source in main detector • Purpose • Gain monitoring (?). • Light transparancy monitoring. • Deadtime monitoring at pmt level. • System • LED • Laser • Xe flash light

  10. Integration meeting will be in new detector group meeting from Oct 07. • Preliminary plan tomorrow.

  11. Time Table for Commissioning • Key jobs • MC • neutrons from muon simulation urgent !! • Internal background (U,Th) urgent !! • Prototype • PMT selection (still we hope to use identical PMTs for proto-type II) • R&D on Calibration methods • LS • Should develop a robust method to measure internal radioactivity. • Long-term stability check should begin asap. • Electronics • Need to fix a basic scheme to use Proto-type II

  12. Requirements for RENO electronics • ~ 500 pmts for each detector(near & far) • PMT signals • Should record single p.e. for each pmt • PMT gain = 107 • Dynamic range of each PMT = 1-1000 p.e. • Single photoelectron resolution ~ channel 10 •  ~ 12 or 14 bit is preferrable. • Use low frequency FADC with shaping signals. • Timing resolution = 1-1.5 ns (?) • Need separate TDC for each channels. Dynamic range of RENO as 1000pe was for 30 MeV event occurring near the edge of gamma catcher. For muons, it would be 10 times higher.

  13. Requirements for RENO electronics • Trigger • Redundancy with both trigger • Multiplicity trigger(from ~ 500 pmts) • Should be able to set the multiplicity remotely. • Sum_E trigger(from ~ 500 pmts) • How can we sum the linear signal of 500 pmts ? • Muon system Trigger can be added as OR. • LED trigger + Pulse trigger as OR • DAQ rate • ????

More Related