FPD STATUS

FPD

FPD STATUSFPD STATUS

JORGE MOLINA

CBPF

February 2002

FPD

10 detector cartridges have been installed: 8 in the vertical plane, 2 at Dipole locations

We expect to install the remaining 8 in the July 2002 shutdown

Z(m)

D2

P2Q

Q4 SQ2Q2Q3 Q3Q4S

A1UA2U

A1DA2D

P1U

2333 3323057

P2U

P1D P2DD1

Detector InstallationDetector Installation

FPD

• 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.

Castle StatusCastle Status

FPD

4 fiber bundlefits well thepixel size ofH6568 16 Ch.MAPMT (Multi-Anode Photomultiplier Tube)7 PMT’s/detector16 250 m fibers each PMT

UU’

Six planes(u,u’,x,x’,v,v’)of 800 m scintillatingfibers (’) planesoffset by 2/3fiber

20 channels/plane(U,V)(’)16 channels/plane(X,X’)112 channels/detector18 detectors2016 total channels4 fibers/channel8064 fibers1 250 m LMB

fiber/channel8 LMB fibers / bundle252 LMB bundles80 m theoretical

resolution

Detector SetupDetector Setup

FPD

At the University of Texas, Arlington (UTA), scintillating and optical fibers were spliced and inserted into the detector frames.

Detector AssemblyDetector Assembly

FPDDetector MappingDetector MappingAfter 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.

FPD

The two-part cartridge houses the detector and 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

Detector CartridgesDetector Cartridges

FPD

The plastic frames containing the other end of the fibers are attached to the

cartridge bottom.

Detectors in Detectors in CartridgesCartridges

The cartridge bottom is installed in the tunneland the detector is pushed to the bottom of

the pot.

FPD

A2 station with cartridges mounted in the vertical plane

Installed CartridgeInstalled Cartridge

FPD

All 18 cartridges are assembled. Ten cartridges are installed:

• 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 weregrouped according to their characteristics

In February the installation of the remaining four detectors of Phase I will be completed

Cartridge StatusCartridge Status

FPD

In the October shutdown four veto counters each of which cover 5.2 < || < 5.9 were installed between DØ and the quadrupoles, about 6 m from the interaction point.

VETO COUNTERSVETO COUNTERS

FPD

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

FPD

POT MOTIONPOT 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.

FPD

LVDT (Linear Voltage Displacement Transducer)connected to the castle measure the actual pot displacement and return values giving the distance from the “Home” position of each pot.

Detector locationDetector location

FPD

Pot Motion SafeguardsPot 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 ofemergency (tested but not used).

FPDPot Insertion MonitorPot 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

FPDFPD BLOCK READOUT AND TRIGGER FPD BLOCK READOUT AND TRIGGER

CHAINSCHAINS

FPD

We are working on commissioning the standard Run II DAQ. The most recent progress was the construction and installation of the Transition Patch Panel and combs.

Standard DAQStandard DAQ

We are working on the DFE FPGA logic and awaiting our complement of AFE boards,integration with DØ is scheduled over the next3 months.

FPD

STAND-ALONE DAQSTAND-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).

FPD

View of the Small Control Room used for theStandalone DAQ

FPD

Elastic Trigger Logic

FPD

The Trigger Scintillators were plateau using elastic events in a three fold/four fold basis:

Plateau Curves

FPD

A problem we had in the tunnel was due to noise caused by the (WWII surplus) low voltage power supplies used for the amplifier boards. They induced a current in the cables that added an extra peak in pedestal distribution.

Problems …Problems …

FPD

•The problem were solved by adding a new rack at each pot station in the tunnel with new high quality LVPS and isolation transformers (this configuration also isolates Tevatron and DØ noise sources).

and Solutionsand Solutions

FPDRESULTSRESULTS

Spectra for plane U in the detector P2D withPedestal subtraction and TDC cuts

Elastic ADC Distribution

FPD

Hit distribution for detector 1 plane by plane

FPDMultiplicity distributions per each plane in both detectors

FPDTotal multiplicity both detectors and event Selection that satisfies the requirements ofHaving at least 3 hits per detector

FPD

Hit ReconstructionHit Reconstruction

This event (from Engineering Run data) represents a hit in our detector at the

location:xd = 5.6 mmyd = 3.8 mm

FPDSOFTWARE UPDATESOFTWARE UPDATE

The principals advances in Software development were made in:

•Unpacking

•Tracking

•Single Interaction Tool

•Alignment

•Gap Tool

•Database

FPDPlans and MilestonesPlans 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

FPD

•Tremendous progress in installation and commissioning

•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!

CONCLUSIONSCONCLUSIONS

FPDCurrent FPD GroupCurrent FPD Group–Alberto Santoro (co-leader, UERJ) Alberto Santoro (co-leader, UERJ) –Andrew Brandt (co-leader, UTA)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)