Revision as of 17:58, 4 November 2013

file dir

https://www.dropbox.com/sh/365le2o93vpn14e/yM3akCdLSK/readout

signal estimation for preshower

• assumption
  • 105 photoelectrons from a MIP with 15% QE, according to Fig 3.2 of http://lhcb-calo.web.cern.ch/lhcb-calo/html/TDR/calo_tdr/node14.html . Our 2cm preshower scintilator is 33% thicker than 1.5cm in LHCb PS, so 140 photoelectrons for SoLID PS MIP
  • in SoLID preshower, one MIP is 6MeV, max signal is 200MeV, (refer to plot in writeup), let plan to cover 6MeV to 240MeV which is 1 MIP to 40 MIP, then photoelectrons from PS range from 140 - 5600
  • pulse full width 20ns, according to scope picture from Simona's test (slide 26 of talk). Simplify it as a triangle shape, then pulse height is about 2 times pulse area
  • 50 ohm matching
  • at 1000V, MAPMT H10966 has gain 3e5 (comparing to MAPMT H8500C has gain 1.5e6)
  • both MAPMT H10966 and H8500C has anode uniformity (=gain*photocathode sensitivity) 1:3 in its spec sheet (Simona's test confirms it) and this leads to a factor 9. H7546 has 1:5 according its spec and leads to a factor 25

• result without uniformity problem
  • pulse height min 140*3e5/20e-9*1.6e-19*50*2=0.0336V
  • pulse height max 5600*3e5/20e-9*1.6e-19*50*2=1.344V
  • dynamic range 40=1.344/0.0336

• result with 1:3 uniformity problem
  • pulse height min 140*3e5/20e-9*1.6e-19*50*2/3=0.0112V
  • pulse height max 5600*3e5/20e-9*1.6e-19*50*2*3=4.032V
  • dynamic range 360=4.032/0.0112

• conclusion
  • we need a gain about 1.5e5 (850V for H10966 or 750V for H8500C) to make pulse height max < flashADC limit 2V
  • 12 bit ADC with 4096 channel like the Jlab flasADC can cover the dynamic range required about 400 if a MIP is at channel 10

• note
  • LHCb structure before ECAL is 1.5cm SPD + 2.5X Lead + 1.5cm PS, MAPMT H7546 with special front end electronic for readout, 10bit ADC for PS, 1bit for SPD

MAPMT

general info

MAPMT assembly from hamamatsu http://www.hamamatsu.com/jp/en/product/category/3100/3002/index.html

A quick summary of files under the dropbox directory "MAPMT/":
new MAPMT from Hamamatsu with batter efficiency (New MA-PMT from Hamamatsu.pdf)
CLAS12 RICH H8500C test, including  crossstalk result (Hoek_H8500_Characterization.pdf)
CLAS12 RICH frontend (130626_RICH_Tech_Rev_FrontEnd.pdf)
CLAS12 RICH DAQ (HallB_RICH_DAQ_June2013.pdf)
CLAS12 RICH review report (Rich_Tech_Review_report.pdf)
SBS coordinate director, similar to SoLID EC SPD (CDet-talk-SBS-MeetingJune2013-Sarty.pptx)
W&M report on LHCb MAPMT (MAPMT_gain_match_report.pdf)

Here is a note about LHCb SPD/PS prototype http://lhcb-calo.web.cern.ch/lhcb-calo/internal/TDR/notes/031/bt.ps It has a lot info about fiber embedding and MAPMT H7546 test

Here is another short note of LHCb H7456 test. https://www.dropbox.com/sh/365le2o93vpn14e/XTO79_pZFd/readout/MAPMT/study/democrite-00013700.pdf

H7546 spec is here https://www.dropbox.com/sh/365le2o93vpn14e/qNmztVpj9k/readout/MAPMT/Hamamatsu/H7546A_H7546B_TPMH1240E12.pdf It is a package name and has R7600-M64 inside. But LHCb docs mentioned their H7546 has R5900-00-M64 PMT. Maybe the package has evolved.

CLAS12 RICH has some H7546 test done also https://www.dropbox.com/sh/365le2o93vpn14e/cO2xnFVA-z/readout/MAPMT/study/Montgomery_NPESeminar_150911.pdf

Hamamatsu related

• The new MA-PMT, H12700, is still under development. We hope to be able to release it by the end of this year
• H8500's uniformity map in Figure 3 on page 2 of its datasheet (http://www.hamamatsu.com/resources/pdf/etd/H8500_H10966_TPMH1327E02.pdf). By standard spec, the non-uniformity has to be less than 1:3. It reflects variation in anode sensitivity, which is gain x photocathode sensitivity. The 1:3 means that we record the relative output of all anodes: the lowest output must be larger than 1/3 of the highest one.