FPD

FPD STATUSFPD STATUS

JORGE MOLINA

CBPF

February 2002

FPDCurrent FPD GroupCurrent FPD Group•UTA

–Andrew BrandtAndrew Brandt (faculty)–Mike Strang (grad student)–Pierrick Hanlet (post-doc) –Christophe Royon (Saclay faculty) –Victor Bodyagin (Moscow State faculty) –Jia Li (engineer/physicist)–Tom Lytle (grad student)

•Brazil –Alberto Santoro (faculty) Alberto Santoro (faculty) –Sergio Novaes (faculty)–Jorge Molina (grad student)–Gilvan Alves (faculty) –Helio da Motta (faculty)–Newton Oliveira (engineer)–Eduardo Gregores (post-doc)–Mario Vaz (engineer)–Jorge Barreto (faculty)–Vitor Oguri (faculty)–Carley Martens (faculty)–Marcia Begalli (faculty)–Andre Sznajder (post-doc)–Wagner Carvalho (post-doc)

•Other –Mike Martens (FNAL)–Vladimir Sirotenko (FNAL)–Carlos Avila (Bogata)– S. Ahmed (Nijmegen)–Brian Cox (Manchester)

(based at FNAL)

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.

DD

Quadrupole castle A2 installed in the beam line.

Castles StatusCastles Status

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 (subject to funding for PMT’s).

Z(m)

D2

P2Q

Q4 SQ2Q2Q3 Q3Q4S

A1UA2U

A1DA2D

P1U

2333 3323057

P2U

P1D P2DD1

Detector InstallationDetector Installation

FPDDetector SetupDetector SetupDetector SetupDetector Setup

4 fiber bundlefits well thepixel size ofH6568 16 Ch.MAPMT

7 PMT’s/detector

16 250 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

FPD

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

Detector AsemblyDetector Asembly

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.

FPDDetector CartridgesDetector CartridgesDetector CartridgesDetector Cartridges

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 cookies

FPD

The cookies containing the other end of the fibers is attached to the cartridge

bottom.

Detectors in CartridgesDetectors in Cartridges

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

the pot.

FPDInstalled CartridgeInstalled CartridgeInstalled CartridgeInstalled Cartridge

A2 station with cartridges mounted in the vertical plane

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

• 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

Cartridges StatusCartridges StatusCartridges StatusCartridges Status

FPD

In the October shutdown four veto counters each of which cover 4.2 < || < 5.9 were installed between DØ and the quadrupoles, about 6 m from the interaction point.

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

VETO COUNTERSVETO COUNTERS

FPD

POT MOTIONPOT MOTION

Pot motion is performed 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.

LVDT’s connected to the castle measure the actual pot displacement and return values giving the distance from the “Home” positionof each pot.

FPD

Calibration of the LVDT versus encoder values

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).

FPDLumberjack PlotsLumberjack Plots

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

FPDFP

D B

LOC

K R

EA

DO

UT A

ND

TR

IGG

ER

CH

AIN

SFP

D B

LOC

K R

EA

DO

UT A

ND

TR

IGG

ER

CH

AIN

S

FPD

DAQDAQ

•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

In parallel, work continues 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

Elastic Trigger Logic

FPD

The L0 PMT's were plateau using elastic eventa 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 …

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).

•****Need new narrow pedestal plot here from victor

and Solutions

FPDSOFTWARE UPDATESOFTWARE UPDATE Unpacking

•Data unpacking utilities ready and released.

•Mapping from detector to AFE channel ready.

•Need calibration package for a final release

Tracking•Single track reconstruction implemented

•MC ξ- and t-distributions obtained

•Acceptance studies completed

•Multi-track studies near completion

•“Final “version in next release

FPDSingle Interaction Tool

•Vetoes on multiple event vertices reconstructed in silicon•Maximum calorimeter energy cut included•Waiting for Luminosity Monitor information

•Monte Carlo tests underway

Database

•Pot positions and alarms in Oracle databases. Need to add the beam parameters to calculate beam positions, and expected pot positions from Python program.

FPDAlignment

•MC to study elastic events with FPD has been implemented

•MC studies for alignment to investigate uncertainty on beam position

•MC studies fro mmeasurements of total cross section using Tevatron injection lattice

•Next steps:

•Algorithm for Online alignment of the FPD detector

•Procedure for total cross section and luminosity measurements

Gap Tool

•Ready to include rapidity gap cuts at Level 2 of trigger

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

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

FPD

Pot Motion TestsPot Motion Tests

Initially pot motion tests restricted to end of stores, so progresss slowEventually gained confidence of BD, allowed to insert pots anytime

FPDConclusions

• 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!