Difference between revisions of "Solid calorimeter readout"

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* assumption
 
* 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  
+
** 22 photoelectrons per MIP from LHCb test in 2005 [https://www.dropbox.com/sh/365le2o93vpn14e/AmWFi3VZDc/other_calorimeter/LHCb/1-s2.0-S0168900204020145-main.pdf], 105 photoelectrons per MIP from LHCb test around 2000 [http://lhcb-calo.web.cern.ch/lhcb-calo/html/TDR/calo_tdr/node14.html]. We take the later result as 22. Our 2cm preshower scintilator is 33% thicker than 1.5cm in LHCb PS, so we assume 30 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
+
** in SoLID preshower, one MIP is 6MeV, max signal is 200MeV, (refer to the plot in SoLID pCDR). If we plan to cover 6 - 240MeV which is 1 - 40 MIP, then photoelectrons from PS range is 30-1200
 
** pulse full width 20ns according to scope picture from Simona's test of H8500C (slide 26 of [http://hallaweb.jlab.org/12GeV/SoLID/meeting_coll/2012_02/scollaboration_feb3_4_2012_sp_malace.pdf talk]). According to LHCb study, pulse shape has many variation and 25ns only covers about 85% of pluses on average. We assume 30ns.
 
** pulse full width 20ns according to scope picture from Simona's test of H8500C (slide 26 of [http://hallaweb.jlab.org/12GeV/SoLID/meeting_coll/2012_02/scollaboration_feb3_4_2012_sp_malace.pdf talk]). According to LHCb study, pulse shape has many variation and 25ns only covers about 85% of pluses on average. We assume 30ns.
 
** Simplify pluse shape as a triangle shape, then pulse height is about 2 times pulse area
 
** Simplify pluse shape as a triangle shape, then pulse height is about 2 times pulse area
 
** 50 ohm matching
 
** 50 ohm matching
 
** at 1000V, MAPMT H10966 has gain 3e5 (comparing to MAPMT H8500C has gain 1.5e6)
 
** 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
+
** 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 1:3 according to LHCb tesr, but it has 1:5 according its spec. We assume 1:3
  
 
*result without uniformity problem
 
*result without uniformity problem
−
** pulse height min 140*3e5/30e-9*1.6e-19*50*2=0.0224V
+
** pulse height min 30*3e5/30e-9*1.6e-19*50*2=0.0048V
−
** pulse height max 5600*3e5/30e-9*1.6e-19*50*2=0.896V
+
** pulse height max 5600*3e5/30e-9*1.6e-19*50*2=0.192V
 
** dynamic range 40
 
** dynamic range 40
  
 
*result with 1:3 uniformity problem
 
*result with 1:3 uniformity problem
−
** pulse height min 140*3e5/30e-9*1.6e-19*50*2/3=0.0075V
+
** pulse height min 30*3e5/30e-9*1.6e-19*50*2/3=0.0016V
−
** pulse height max 5600*3e5/30e-9*1.6e-19*50*2*3=2.688V
+
** pulse height max 1200*3e5/30e-9*1.6e-19*50*2*3=0.576V
 
** dynamic range 360
 
** dynamic range 360
  
 
* conclusion
 
* conclusion
−
** we need a gain about 1.5e5 (850V for H10966 or 750V for H8500C) to make pulse height max < flashADC limit 2V  
+
** 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
 
** 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 =
 
= MAPMT =

Revision as of 13:45, 5 November 2013

file dir

on dropbox

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

signal estimation for preshower

  • assumption
    • 22 photoelectrons per MIP from LHCb test in 2005 [1], 105 photoelectrons per MIP from LHCb test around 2000 [2]. We take the later result as 22. Our 2cm preshower scintilator is 33% thicker than 1.5cm in LHCb PS, so we assume 30 photoelectrons for SoLID PS MIP
    • in SoLID preshower, one MIP is 6MeV, max signal is 200MeV, (refer to the plot in SoLID pCDR). If we plan to cover 6 - 240MeV which is 1 - 40 MIP, then photoelectrons from PS range is 30-1200
    • pulse full width 20ns according to scope picture from Simona's test of H8500C (slide 26 of talk). According to LHCb study, pulse shape has many variation and 25ns only covers about 85% of pluses on average. We assume 30ns.
    • Simplify pluse shape 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 1:3 according to LHCb tesr, but it has 1:5 according its spec. We assume 1:3
  • result without uniformity problem
    • pulse height min 30*3e5/30e-9*1.6e-19*50*2=0.0048V
    • pulse height max 5600*3e5/30e-9*1.6e-19*50*2=0.192V
    • dynamic range 40
  • result with 1:3 uniformity problem
    • pulse height min 30*3e5/30e-9*1.6e-19*50*2/3=0.0016V
    • pulse height max 1200*3e5/30e-9*1.6e-19*50*2*3=0.576V
    • dynamic range 360
  • conclusion
    • 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

MAPMT

W&M study https://www.dropbox.com/sh/365le2o93vpn14e/5W0btJ3NzY/readout/MAPMT/study/MAPMT_gain_match_report.pdf

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

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.

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