# Presentation: 018449

## DØ Calorimeter Status

**Z**

**y**

**x**

****

- 

**p**

- Liquid argon sampling
- Stable, uniform response, rad. hard, fine spatial seg.
- LAr purity important
- Uranium absorber (Cu or Steel for coarse hadronic)
- Compensating e/  1, dense  compact
- Uniform, hermetic with full coverage
- ****< 4.2, int ****total)

**L. Ar in gap**
**   ****2.3 mm**

**Ur absorber**
**3, 4 or 6 mm**

**Cu pad readout on 4.6 mm**
** ****G10 with resistive coat epoxy**

**p**

**_**

- Energy Resolution
- e: E / E = 15% /E+ 0.3% (e.g.  3.7% @ 20 GeV)
- :  E / E = 45% /E +  4%   (e.g. 14%   @ 20 GeV)

**ICD**

## Run II Calorimeter Electronics

** ****55K readout channels**
**Replace signal cables from cryostat to preamps (110******** ******** 30********)**
**Replacement of preamps, shapers, baseline subtraction circuitry (BLS)**
**Addition of analog storage: 48-element deep Switched Capacitor Array – SCA**
**New Timing and Control**
**New calibration pulser + current cables**

**Preamp/**
**Driver**

**Trig. sum**

**Filter/**
**Shaper**

**x1**

**x8**

**SCA (48 deep)**

**SCA (48 deep)**

**SCA (48 deep)**

**SCA (48 deep)**

**BLS**

**Output**
**Buffer**

**Bank 0**

**Bank 1**

**Replace cables**
**for impedance**
**match**

**new low noise **
**preamp & driver**

**Shorter **
**shaping**
**~400ns**

**SCA analog storage**
**> 4********sec, alternate**

**Additional**
**buffering for L2 & L3**

**SCA**

**new calibrated**
**pulse injection**

- BLS Card

**DETECTOR**

## Calorimeter Electronics Status

**Preamp**
**All tested and installed (1152 motherboards x 48 preamps = 55k)**
**ECS recabled after being off platform**
**All 24 + 1 ICD power supplies installed**
**All calibration pulsers installed, cabled, tested and commissioned**
**Commission preamps and readout chain**
**Fix known broken cables in shutdown**
**BLS**
**36/36 PS installed + 3 spares; 12 BLS fanouts installed **
**>10/12 quadrants populated (964/1152). **
**Need 200 more (~100 for high eta – MG, ICD)**
**Final board assembly/modifications/testing at SUNY-SB (> 20/week).**
**Commission**
**ADC Readout and Timing & Control**
**Run I ADC’s working fine and being readout as part of data taking**
**12 Timing and Control cards being used **
**need T&C controller (1-2 week layout, 2-4 week production)**
**PIB control working and being readout into data**

## Calorimeter Electronics Status

## Intercryostat Detector (ICD) Installation

**Intercryostat Detector (ICD) Installation**

**ICD Tiles and Electronics**
**Readout through Calorimeter BLS system with slightly different preamps**
**1.5 tiles installed and instrumented on ECS-SW for 36 x 36**
**PMT box, HV + LV power, electronics pulser installed**
**Calibration, fiber characterization and PMT matching for signal optimization ongoing in cosmic ray test-stand**
**Final install in May shutdown on ECS.  ECN might depend on FPS cabling issues**

## Calorimeter Commissioning Shifts

**Calorimeter Commissioning prior March 1 startup. **
**Got most of CC done (<0.5% bad channels)**
**Shifts ongoing 2-3/day.  Thanks to all who contributed**
**U. Bassler, F. Beaudette, G. Bernardi, M. Bhattacharjee,     V. Bhatnagar, L. Duflot, T. Eltzroth, S. Fu, M. Gao,               R. Hauser, M. Hohlfeld,  B. Kehoe, N. Parua, M. Ridel,         D. Schamberger, M. Tuts, V. Zutshi**
**Will finish up ECS and most of ECN in May shutdown**

## Calorimeter LAr, HV

**LAr and HV**
**All cryostats filled with LAr – no leaks!!!**
**All HV has been turned on to 2kV on all channels – stable over the last few weeks**
**LAr purity tested  (< 0.4 ppm O****2**** equiv.)**
**LAr temp. and purity being monitored**

## Calorimeter Downloads & Controls

**Downloads/controls**
**Final download system (COMICS) not in place yet but tested with prototype**
**Pedestal/limits files will be read from pickle file in Comics and downloaded to ADC**
**Working on pulser  and   T&C communication**
**Control GUIs (via EPICS) for LV and HV work**
**General alarm monitoring of all systems via SES needs to be fully implemented**
**General “health” GUI for shifters needed**

## Calorimeter Calibration

**Calibration**
**Pedestal calibration data sent to and processed in L3 scriptrunner node**
**Data sent to CalibManager and then to Online Oracle dB.  Need to extend for gain calibrations and to send to offline.**
**Python tools extract data to ***pickle*** files**
**Working on handling dual gain pedestals and gain runs with pulser**
**Need automatic setup, validation and extraction tools**

## L1/L2 Calorimeter Trigger

**L1/L2 Cal trigger uses EM and FH layers (no CH)**
**Trigger Hardware – BLS boards**
**Layer weights determined for CC and EC**
**Trigger drivers/summers 94% installed for CC (****|********| < 1.2)**
**Remaining summers being repaired**
**Triggers drivers here for EC (1.8 < |********| < 3.8).  Summers here in ~ 1 wk**
**New for Run II – trigger on MG and ICD at L2.   **
**Recovers jet response and resolution in ICR region**
**Sampling weights have been determined and in the process of ordering parts to make the high eta summers and drivers.  **
**Trigger summers – first pass.  Final tuning done with beam**
**Trigger Hardware – MCH1**
**L1 CTFE boards – use Run I electronic resistor network for CC –0.8 < ******** < 0.8**
**Run II variable gain mezzanine cards out for production soon**
**For start of run expect 16 trigger terms available**** **
**CEM(1or 2,rs****i****), CJT(1 or 2,rs****i****)**
**4 reference sets: EM: 2, 5, 7, 10, Total: 2, 3, 5, 7 GeV. **
**Uncertainty in energy scale about 30%**
**Full readout to L2 + L3 needs some coding and equipment ~ 1 month**
**Can readout via monitoring path for 36x36 **
**Final timing of trigger to the signal and beam crossing needs to be done**

## Hot off the Press!!!

**Hot off the Press!!!**

**Data taken around 00:00 today!**

**        ****Date Created: Friday, April 27, 2001 12:18:00 AM CDT**
**              ****Date Saved: Friday, April 27, 2001 12:38:28 AM CDT**
**              ****Category - Topic - sequence number: CAPTAIN_Shift/Log - General_Log - 3016**
**              ****Operator(s): Horst Wahl**
**              ****Keyword(s): :CAPTAIN:**
**              ****0:15 experts around: Dean Schamberger, Mike Tuts, Dan Edmunds, Michael Begel **
**              ******** first calorimeter trigger run taken *** **
**              ****run # 119575, CAL only, trigger: 1 em tower > 7 GeV **
**              ****36x0 store in the Tevatron **

## Pulser Timing Studies

**Variation of pulse delay to study signal shape and to determine timing for maximal response for different preamp type and calorimeter capacitance**
**Variation of pulse height to determine linearity and gain calibration factors**

**Automatic ramp mechanism will allow for detailed studies of timing and linearity**
**Offline unpacking and analysis software needed**

## Pulser Delay Curves

**EM   – 4 parameter fit**
**HAD – 6 parameter fit**

**Extract timing parameters and gain calibration coefficients**
**Correction factors due to difference between pulser and physics signal**

## Calorimeter Status and PlansApr-May 2001

**Status**
**Almost all infrastructure in place **
**All crates reading out.  Few need some internal timing for readout. **
**T&C controller still ~6 weeks**
**>10/12 quadrants instrumented.   **
**200 BLS boards to go, 100 for high eta, > 20/week**
**CC mostly debugged (0.5% level), work on ECS + ECN in May**
**Trigger summers/drivers **
**CC essentially done (94%)**
**EC summers should be here for May shutdown – test and install**
**Ordering parts for high eta (MG, ICD)**
**Run Plan for 36 x 36**
**Think we are timed in relative to TFW using pulser and trigger pickoffs to within one bunch crossing (132 ns)**
**Use triple digitized readout to get this exact**
**Compare L1 trigger energy and precision readout (gains are off a bit as Run 1 hardware at first)**
**Take steady data for online/offline calibrations, ********-intercalibration, timing + response studies, energy-scale determination etc., etc.**