Log entry time 21:28:56 on October 21, 2008

Entry number 244296

keyword=Notes on EDTM Setup for E06-010

Here are the numbers for the EDTM timing setup for Transversity.

Some of these numbers were copied from Halog entry 237880.

"Measured" time from BB EDTM Master Front to BB Frontend


Time (ns)         Description
----------------------------------
122           Internal EDTM delay
 10           Lemo to patch panel
256           RG58 to Frontend
  8           Internal FI/FO delay
  8           Lemo to Summing modules
----
404 ns

"Measured" time from BB EDTM Master Back to LHRS Scintillator input


  8       Lemo to patch panel
260       RG58 to LHRS hut
  3       Lemo to FI/FO
  8       Internal FI/FO delay
 16       Lemo to EDTM Slave
226       Internal EDTM delay (measured indirectly... need direct verify).
----
521 ns

Time difference between EDTM pulses without adjustment:

  L-B = 521 - 404 = 117
ns

---------------------------------------------------------------------------------------------------------------

Times to get from target to point at which EDTM is injected

Proton or Pion into HRS


    0.620    1.235     2.400  GeV
   ------------------------------
   Proton   Proton     Pion
    157      109        87     TOF
     60       60        60     Signal cable from PMT
    ---      ---       ---
    217      169       147

Electron into BB


 14       TOF
 60       Signal cable from PMT
 15       Internal Amplifier delay
  8       Lemo to summing module
---
 97 ns

Time difference between proton/pion and electron signals to EDTM injection point:


      0.620    1.235     2.400  GeV
      ------------------------------
L-B = 120       72        50

EDTM script to set this up:

   ~atrig/edtm/edtmsetup [LHRS_DELAY] [BB_DELAY]

To set this up with the edtm script, need to account for the fact that the BB EDTM is set in units of 2.2ns, and the LHRS is in units of 1.0ns. So... for simulating a 0.620 GeV proton in coincidence with a BB electron:

    edtmsetup 120 53

A copy of this log entry has been emailed to: kalyan@jlab.org,moffit@jlab.org,rom@jlab.org

User name V. Sulkosky

Log entry time 21:28:56 on October 21, 2008

Entry number 244296