# Presentation: 498730

## ICD Status

** ****ADC to GeV Conversion**
** ****cal_examine Plots**
** ****Mapping**
** ****Other issues**

**Alan L. Stone**
**Louisiana Tech University**
**D****Ø Collaboration Meeting**

***Based on investigations by Alan Stone, Andy White,***
***Leo Chan, Dean Schamberger, Lee Sawyer, Vishnu***
***Zutshi and Bob Kehoe***

## ICD Cosmic Ray Test Stand Results

**Convert Test Stand ADCs to DØ Calorimeter ADCs**
**Used CAL  instead of ICD type preamps**
**Better separation between pedestal and MIP peak**
**Test stand signal boost by factor of 8.7**
**Least count of test stand ADC was 1 mV & for Calorimeter it is 0.1 mV **

**Average MIP Peak (368 channels)**
**from  data taken in Spring 2001**
**was 135.7 ADC Counts.**

## ADC to GeV Conversion

**Average MIP peak in Calorimeter ADCs**
**[135.7×(1.0/0.1)]/[(22.5/5.5)×8.7] = 38.13 ADC counts**
**dE/dx****min**** = 2.02 MeV/cm   ****(*****PVT Scintillator)***
**Energy deposition in ICD tile**
**[(CAL ADC counts)/38.13]×(2.02 MeV/cm)×1.27 cm**
**(CAL ADC counts)×(0.0000673) ******** [Energy in GeV]**
**Correct for flipped resistors *****(factor of 32/23)***
**(CAL ADC counts)×(0.0000936) ******** [Energy in GeV]**
**Current factor in plt_latest.rcp is:**
**(1/20000)×(32/23) =  0.0000694**
**Change would increase the ICD energy reconstructed by 35%!**
**Current Reco version on farms is p10.15.01**
***caltables*****:  plt_latest.rcp ******** tag p10-15-01**

## What do we see in cal_examine for ICD?

**Average pedestal is 600 ADC counts**
**Vertical axis is E****T**** in GeV.**

**North**

**South**

**Current version is t02.08.00**
**Took zero bias run, in normal, unsuppressed mode.**

## What do we see in cal_examine for MG?

**North**

**Average pedestal is 600 ADC counts**
**Vertical axis is E****T**** in GeV.**

## And neighboring CAL layers...

**North**

**Average pedestal is 600 ADC counts**
**Vertical axis is E****T**** in GeV.**

## Address Changes in Software

***caladdress*****:  CalChan.cpp ******** tag p11-05-00**
**Correction to ICD fiber backplane miscabling not tagged for production release**
**Eta is swapped (12********14) for the NE & SW quadrants**
**Code fix made between 8-18 March 2002**
**However, we wanted to do test online with cal_examine *****(online version t02.08.00)***
**4 March:  Call for release requests for t02.08.00**
**No **_**caladdress **_**in builds 1-4 **
**11 March:  Call for release requests for t02.09.00**
_**caladdress**_** went from v00-03-06 to v00-03-07**
**18 March: Call for release requests for t02.10.00**
_**caladdress**_** went from v00-03-07 to v00-03-08**
**This is the last tagged version by Bob Kehoe**

**?**

## New Address Feature

**New problem was found a few weeks ago**
**We looked at sets of 3 ICD channels from each CAL crate in which the ICD is readout**
**Crates 40,41,44,45,46,47,4A,4B **
**Turned off all HV except for these 24 channels**
**Took “snapshot” of output in ADC counts & transverse energy in GeV**
**Then lowered HV for 1 in each 3 channels by 50 V **
**All channels in West appear phi swapped in output of cal_examine *****(but not in cal_elec)***
**Sent email to Bob Kehoe – not sure if this is a bug in caladdress, or if the problem is internal to the online version of cal_examine**

## After

- Before

**Turned on ICD LED pulser. Turned off all HV except for channels shown.**
**Reduced  by 50V for a single channel in each group of three (each Calorimeter readout crate in which the ICD resides). Referenced ICD channel map. cal_elec is correct.**

## cal_examine gives 

**Before**

**After**

**cal_examine gives **
**incorrectly ******** = 26**
**Should be 25.**

**CAL crate 1 (ICD NW12) & **
**CAL crate 11 (ICD NE16)**

**cal_examine gives **
**correctly ******** = 15.**

## Other Issues That Need Attention

**Isolated muons tracked through ICD**
**Verify MIP response in ADC counts**
**Channel to channel correction**
**SCA non-linearity effects**
**Small contributions from ICD tiles to jets**
**Calorimeter geometry**
**ICDmodule.hpp/cpp last modified 9 Aug 2000**
** ****Has anyone independently checked on this?**
**D0scan – different color scheme for ICD**
**George Alverson is currently working on this**

## Summary

**ICD electronic output is working well**
**cal_elec addressing is as expected**
**Verified with LED pulser **
**Only a handful of weak or dead channels**
**New PMTs are on hand & being tested**
**New motherboards are also at D0**
**We need to wait for major shutdown to get time & access to the East/West platforms**
**ICD response is at the mercy of the software**
**We need to get into p11 right away:**
**Corrected addressing**
**Corrected ADC to GeV conversion **

**All but**
**one **
**in the **
**North**