# Presentation: 211315

## Near Detector Electronics

- Hardware Status
- Schedule for Production Sign-off
- CALDET Run in Progress

## Hardware Overview

- 16 MENUS per MINDER
- 9248 Total

- MENU-
- Support card for QIE (1 pixel)

- MASTERS
- VME Readout Boards
- 8 Minders Each

- MTM – timing for crate

- M64

- 80 MASTERs
- Up to 12 per VME crate
- 8 VME crates

- 44 Front End Crates

- VME Processor

-  VME Timing Module

## Hardware Status

- QIE
- All Chips in hand.  Packaging and Testing in progress
- MENU
- Most numerous component
- 1 minor modification forseen
- MINDERS
- 1 more Prototype cycle (Version 3)

**Notes:**
Check numbers of each type – need design parameter book

## Hardware Status, cont.

- KEEPERs
- V3 layout (cleanup) in progress
- MASTERs
- Update firmware for V2
- Timing Modules
- Master Clock – “ready to go”
- VTM – 1 more iteration possible
- MTM – Set for production

**Notes:**
Check descriptions such as “vme interface board”

## Hardware Status, cont.

- Front End Crates
- Custom J2 Backplane for voltages and analogue signals
- Specs almost complete
- Power Supplies
- 3U Switchers
- Model from Wiener in hand
- Looking to reduce cost

## Schedule for Production Sign-off

- Remaining system tests at Argonne:
- E.g., data transfer noise, firmware for V2 MASTER, Flasher Trigger on KEEPER, long term stability tests
- Internal review of performance
- Aim for production decision by Nov. 1
- By 11/15 Lehman review, all parts should have been purchased (but not necessarily assembly services)
- 1600 channels by Spring
- Power supplies and crate procurement will be close

## CALDET

-     150 Channels of Near Detector
- 6 planes out of 60 on one side
- Moved into T11 enclosure on Sep. 4, first beam on Sep. 7

- Time of Flight

- Cerenkov

*(not to scale)*

## External Triggering

- External Trigger Timing
- Use unsparsified channel to see arrival of LED or scint. light

- Fraction of charge per RF bucket

- Bucket with max charge

- LI

- TOF

## “Features” Found in CALDET

- Special environment
- High rate dynode trigger running
- External triggering
- Timing issues between ND and FD electronics
- Events in deadtime
- Master input FIFO filling at high rates
- “ADC=FFFF” – real physics issue

## MENU Buffer

- “CAPID error”
- Master Input FIFO would fill up – occasionally saw new data without intervening header
- 500 ns extension to trigger inhibit on MINDER
- Deadtime now 5.5s
- Never would have been seen nominal, baseline running
- Only visible in sustained, high rate dynode triggering

## Hits in Deadtime

- All 3 ND PMT Dynode Triggers ORd for CALDET
- Supposed to have simultaneous deadtime for all MINDERS of 5.5 s
- Observed violation of deadtime – 1 RF tick ambiguity among MINDERS allowed dephasing at high rates
- Only a “problem” for synchronous deadtime
- Fixed in KEEPER

- Hits in deadtime

- Time Between Hits

## “FFFF” Issue - Undershoots

- Some level of apparent near-saturation ADC values
- Tracked to negative numbers (in linearized DAC counts)
- Undershoots have been observed in different teststands
- Masked out, but phsyics needs to be understood

## Does it Work?

- Focus of this afternoon’s talks
- Correlations seen in individual strips well before beam turned on
- Correlation of Electron response is encouraging
- Need thorough offline analysis
- Stability...

## Stability – Pedestal Example

- Dave Reyna:
-     Pedestal variation over 36 hours

## ND Group at Caldet

- Argonne
- Gary Drake, Dave Reyna, Rich Talaga, Jonathan Thron
- IIT
- Bill Luebke, Chris White, Pierrick Hanlet
- Fermilab
- Charlie Neslon, Tom Fitzpatrick, PS
- Oxford  (PMTs, Timing)
- Alfons Weber, Anatael Cabrera, Nathaniel Tagg

## Valuable help and feedback from non-ND people
Ryan Nichol, Tricia Vahle, Mike Kordosky, Chris Smith, Phil Adamson, David Petyt, and others
Dave Reyna
 (not talking today) – solid DAQ and system control code
Nathaniel Tagg – see this afternoon’s talk

- Ryan Nichol, Tricia Vahle, Mike Kordosky, Chris Smith, Phil Adamson, David Petyt, and others
- Dave Reyna
-  (not talking today) – solid DAQ and system control code
- Nathaniel Tagg – see this afternoon’s talk

## Summary

- Near Detector Front End Electronics is at mature stage
- Problems for CALDET running have been dealt with
- No direct impact on nominal running
- Good data in the can for ND/FD comparisons
- See this afternoon’s talks
- Production sign-off foreseen for early November