# Presentation: 573995

## FPD STATUS	

**JORGE MOLINA**
**CBPF**
**February 2002**

## Detector Installation

-     8 in the vertical plane, 2 at Dipole locations
-  We expect to install the remaining 8 in the
-   July 2002 shutdown

**  ****Z(m)**

**  **

**  **

** **

## Castle Status

-  All 6 castles with 18 Roman pots comprising the  FPD were constructed in Brazil and have been installed in the Tevatron in fall of 2000.

- Quadrupole castle A2 installed in the beam line.

## Detector Setup

- 4 fiber bundle
- fits well the
- pixel size of
- H6568 16 Ch.
- MAPMT (Multi-
- Anode Photomultiplier Tube)
- 7 PMT’s/detector
- 16 250 m fibers
-   each PMT

**U**

**U’**

- Six planes
- (u,u’,x,x’,v,v’)
- of 800 m
- scintillating
- fibers
- (’) planes
- offset by 2/3
- fiber

- 20 channels/plane(U,V)(’)
- 16 channels/plane(X,X’)
- 112 channels/detector
- 18 detectors
- 2016 total channels
- 4 fibers/channel
- 8064 fibers
- 1 250 m LMB
- 	fiber/channel
- 8 LMB fibers / bundle
- 252 LMB bundles
- 80 m theoretical
- 	resolution

## Detector Assembly

- scintillating and optical fibers were spliced and inserted into the detector frames.

## Detector Mapping

- After the detectors were assembled and polished, an optical scanner was used to map the exact location and width of the fibers in the  frames to improved detector calibration.

## Detector Cartridges

- phototubes  and allows for easy access to PMT’s.

- The Cartridge top fits over the bottom
- and is secured down causing good contact
- between the tubes and frames

## Detectors in Cartridges

- The plastic frames containing the other end of the fibers are attached to the cartridge bottom.

- The cartridge bottom is installed in the tunnel
- and the detector is pushed to the bottom of
- the pot.

## Installed Cartridge

- A2 station with cartridges mounted in the vertical plane

**Notes:**
This is the way the cartridges looks when they 
are mounted in the castles

## Cartridge Status

-  6 of them are in their final configuration:
- P1D, P2D, A1D,A2D,D1 and D2
-  2 of them contain prototype detectors: P1U
-    and P2U. Prototype detectors are the first
-    detectors produced and not of high quality
-    as later ones (we will keep them as spares)
-  2 of them are pseudodetectors (trigger
-   scintillators only): A1U and A2U
- All the MAPMT’s and L0 detectors were
- grouped according to their characteristics
- In February the installation of the remaining four detectors of Phase I will be completed

## VETO COUNTERS

## The counters, two each on the outgoing 

- The counters, two each on the outgoing
- proton and anti-proton arms, can be used to trigger on rapidity gaps.

## POT MOTION

- Pot motion is controlled by an FPD shifter in the DØ Control Room via a Python
- program that uses the DØ online system to send commands to the step motors in the tunnel.

## Detector location

- connected to the castle measure the actual pot
- displacement and return values giving the
- distance from the “Home” position of each pot.

**Notes:**
Here we point out the fact that the values read (LVDT’s) are proportional to the dewsired values (# of turns)

## Pot Motion Safeguards

- The software is reliable and has been tested extensively. It has many safeguards to protect against accidental insertion of the pots into the beam.
-  The drivers are disabled with a switch in   the Control Room when the pots are not being moved.
- The pots are hooked to an emergency line    which bypasses the software to send the   pots back to the home position in case of
- emergency (tested but not used).

## Pot Insertion Monitor

- Effect of the pot motion over the proton and antiproton losses at D0 and CDF

- We should not affect the losses more than
- 20% under the risk of make the beam unstable

## FPD BLOCK READOUT AND TRIGGER CHAINS

## Standard DAQ

- We are working on the DFE FPGA logic and awaiting our complement of AFE boards,
- integration with DØ is scheduled over the next
- 3 months.

## STAND-ALONE DAQ

- Due to delays in DØ trigger electronics,
- we have maintained  our standalone DAQ first used in the fall 2000 engineering  run.
- We build the trigger with NIM logic
- using signals given by our trigger PMT’s,
- veto counters, DØ clock, and the luminosity
- monitor.
- If the event satisfies the trigger  requirements, the CAMAC module will
- process the signal given by the MAPMT’s.
- With this configuration we can read the information of only two detectors (currently PD spectrometer is read out).

## View of the Small Control Room used for the

- Standalone DAQ

**Notes:**
Here we can see the NIM crate where the trigger logic is build and also the CAMAC crate that get the MAPMT’s signals.
We can see also the computer that runs the DAQ program through the power PC

## Elastic Trigger Logic

## Plateau Curves  

- Plateau Curves

## Problems ...  

- supplies used for the amplifier boards.
- They induced a current in the cables that added an extra peak in pedestal distribution.

- Problems ...

## and Solutions  

- and Solutions

## RESULTS

- Spectra for plane U in the detector P2D with
- Pedestal subtraction and TDC cuts

- Elastic ADC Distribution

## Hit distribution for detector 1 

- Hit distribution for detector 1
- plane by plane

## Multiplicity distributions per each plane 

- Multiplicity distributions per each plane
- in both detectors

## Total multiplicity both detectors and event 

- Total multiplicity both detectors and event
- Selection that satisfies the requirements of
- Having at least 3 hits per detector

## Hit Reconstruction

- This event (from Engineering Run data)
- represents a hit in our detector at the location:
- 	xd = 5.6 mm
- 	yd = 3.8 mm

## SOFTWARE UPDATE

- The principals advances in Software development were made in:
**Unpacking**
**Tracking**
**Single ****Interaction Tool**
**Alignment**
**Gap Tool**
**Database**

## Plans and Milestones

- Take more data with Stand Alone DAQ with
- this configuration, then switch detectors to readouts (still for elastic events)
- Take diffractive data.
- TM operational 1/31/02
- AFE installed 3/1/02
- Firmware and Trigger development
- FPD data with 10 pot system 4/1/02
- Prepare for the July shutdown: installation of the horizontal plane

## CONCLUSIONS

- Entering a new FPD era: Installation of Phase   I complete
-  Emphasis shifts to software, operations,      and data analysis
- Trigger hardware and firmware still a major
- concern
- Starting to think about physics a little!

## Current FPD Group

**Alberto Santoro (co-leader, UERJ) **
**Andrew Brandt (co-leader, UTA)**
- Mike Strang (UTA)*
- Pierrick Hanlet (UTA)*
- Christophe Royon (Saclay)*
- Victor Bodyagin (Moscow State)*
- Mike Martens (FNAL)*
- Sergio Novaes (IFT/UNESP)*
- Jorge Molina (CBPF)*
- Gilvan Alves (CBPF)
- Helio da Motta (CBPF)
- Newton Oliveira (UFBA)
- Eduardo Gregores (IFT/UNESP)
- Mario Vaz (CBPF)
- Jorge Barreto (UFRJ)
- Vitor Oguri (UERJ)
- Carley Martens (UERJ)
- Marcia Begalli (UERJ)
- Andre Sznajder (UERJ)
- Wagner Carvalho (UERJ)
- Vladimir Sirotenko (FNAL)
- Carlos Avila (UNIANDES)
-  Jia Li (UTA)
- Tom Lytle (UTA)
- S. Ahmed (Nijmegen)
- Brian Cox (Manchester)*
- * Based at Fermilab

**(based at FNAL)**