Difference between revisions of "Controls Meeting 21-Mar-2013"

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* Announcements
 
* Announcements
 
* Minutes from previous meeting [[Controls_Meeting_7-Mar-2013|7-Mar-2013]]
 
* Minutes from previous meeting [[Controls_Meeting_7-Mar-2013|7-Mar-2013]]
−
* <s>Requirements for BCAL/FCAL LED pulser calibration system - Elton</s>
+
* Requirements for BCAL/FCAL LED pulser calibration system - Elton
 
* Update on FCAL dark room - Dan, John, Manuel
 
* Update on FCAL dark room - Dan, John, Manuel
 
* Update on PLC test stand - Dave
 
* Update on PLC test stand - Dave
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=Minutes=
 
=Minutes=
 +
 +
Present:  Elliott W, Elton S, Dan B, Fernando B, John L, Yi Q, Scot S, Mark S, Dave B, Tara B, Alex S, Hovanes E.
 +
 +
 +
 +
'''BCAL/FCAL Pulser'''
 +
 +
Elton gave a thorough overview of the LED pulser calibration system:
 +
 +
* System needs to send trigger to TS and TTL pulses to LED flashers.
 +
* External power includes 5V and bias to set LED intensity, will use SiPM power supplies.
 +
* LED flashed via capacitor discharge.
 +
* Will have LED boards, distribution boards and external TTL pulsing system.
 +
* LED boards done, distribution boards and pulsing system to be designed.
 +
* For trigger timing all cables will be equal length, will get ~5ns jitter.
 +
* Need 50' LEMO cables from VME crates to distribution cards.
 +
* Cables from distribution boards about 12'.
 +
* 4 lines go to each LED board.
 +
* Will use three CAEN V1495 modules to generate TTL pulses, about $5k each incl. mezzanine boards.
 +
* Max 16 TTL channels per V1495.
 +
* Will likely use two VME crates, one for BCAL with two V1495's, one for FCAL with one V1495.
 +
* Not clear if crates need to be purchased, hope to find free slots in other crates.
 +
* Hope to not have to put V1495's in DAQ crates (discriminator crates are ok).
 +
* V1495 has many LVDS outputs suitable for input to TS.
 +
* FCAL has 10 LED boards per quadrant, 4 LED's per board, three colors.
 +
* FCAL does not use distribution board, TTL signals go directly to LED boards.
 +
* Ben will program V1495, 2 man-weeks allocated.
 +
* Need to program pulse width, trig-to-pulse delay, start, stop, #pulses, etc.
 +
* Once written and tested the FPGA code is not expected to need to change.
 +
* V1495 has programmable switches that could be used to implement local operational modes.
 +
* Will use EPICS to control V1495 operation.
 +
* EPICS driver needs to be written (Nerses or Hovanes).
 +
* Considering running pulsers all the time at low rate during data taking.
 +
* Max conceivable pulse rate 1 MHz, less ok.
 +
 +
 +
 +
'''FCAL Controls'''

Revision as of 13:19, 22 March 2013

Agenda

  • Announcements
  • Minutes from previous meeting 7-Mar-2013
  • Requirements for BCAL/FCAL LED pulser calibration system - Elton
  • Update on FCAL dark room - Dan, John, Manuel
  • Update on PLC test stand - Dave
  • Counting House status - Hovanes, Elliott
    • furniture, computers, networks, etc.
  • EPICS update - Hovanes
  • Solenoid update - Mark, Scot, Elliott
  • Progress on other controls applications - Dave
    • storing/retrieving PLC parameters
  • What is the role of the JInventory system - All
    • relation to DAQ, HV/LV control, cabling?
    • need to finalize conventions and get all equipment entered
    • need to purchase/print and install barcode labels
    • some software improvements and bug fixes remain
    • other halls interested, may provide programming manpower
  • Mantis task tracker
    • start using this again?
  • Midas elog


  • Experiment Control Supervisor - Elliott


Time/Location

9:30AM Thurs 21-Mar-2013 CC A110


Announcements

Next Meeting

9:30am Thurs 4-Apr-2013


Minutes

Present: Elliott W, Elton S, Dan B, Fernando B, John L, Yi Q, Scot S, Mark S, Dave B, Tara B, Alex S, Hovanes E.


BCAL/FCAL Pulser

Elton gave a thorough overview of the LED pulser calibration system:

  • System needs to send trigger to TS and TTL pulses to LED flashers.
  • External power includes 5V and bias to set LED intensity, will use SiPM power supplies.
  • LED flashed via capacitor discharge.
  • Will have LED boards, distribution boards and external TTL pulsing system.
  • LED boards done, distribution boards and pulsing system to be designed.
  • For trigger timing all cables will be equal length, will get ~5ns jitter.
  • Need 50' LEMO cables from VME crates to distribution cards.
  • Cables from distribution boards about 12'.
  • 4 lines go to each LED board.
  • Will use three CAEN V1495 modules to generate TTL pulses, about $5k each incl. mezzanine boards.
  • Max 16 TTL channels per V1495.
  • Will likely use two VME crates, one for BCAL with two V1495's, one for FCAL with one V1495.
  • Not clear if crates need to be purchased, hope to find free slots in other crates.
  • Hope to not have to put V1495's in DAQ crates (discriminator crates are ok).
  • V1495 has many LVDS outputs suitable for input to TS.
  • FCAL has 10 LED boards per quadrant, 4 LED's per board, three colors.
  • FCAL does not use distribution board, TTL signals go directly to LED boards.
  • Ben will program V1495, 2 man-weeks allocated.
  • Need to program pulse width, trig-to-pulse delay, start, stop, #pulses, etc.
  • Once written and tested the FPGA code is not expected to need to change.
  • V1495 has programmable switches that could be used to implement local operational modes.
  • Will use EPICS to control V1495 operation.
  • EPICS driver needs to be written (Nerses or Hovanes).
  • Considering running pulsers all the time at low rate during data taking.
  • Max conceivable pulse rate 1 MHz, less ok.


FCAL Controls

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