FPD FPD STATUS JORGE MOLINA CBPF February 2002

FPD Current FPD Group UTA –Andrew Brandt –Andrew 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) –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 Quadrupole castle A2 installed in the beam line. Castles 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 PMTs). Z(m) D2 P 2Q Q4Q4 S Q2Q2 Q2Q2 Q3Q3 Q3Q3 Q4Q4 S A1U A2U A1D A2D P1U P2U P1DP2D D1 Detector Installation

FPD Detector Setup 4 fiber bundle fits well the pixel size of H Ch. MAPMT 7 PMTs/detector 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 m LMB fiber/channel 8 LMB fibers / bundle 252 LMB bundles 80 m theoretical resolution

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

FPD 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.

FPD Detector Cartridges The two-part cartridge houses the detector and phototubes and allows for easy access to PMTs. 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 Cartridges The cartridge bottom is installed in the tunnel and the detector is pushed to the bottom of the pot.

FPD Installed 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 MAPMTs and L0 detectors were grouped according to their characteristics In February the installation of the remaining four detectors of Phase I will be completed Cartridges 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 COUNTERS

FPD POT 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. LVDTs connected to the castle measure the actual pot displacement and return values giving the distance from the Home position of each pot.

FPD Calibration of the LVDT versus encoder values

FPD 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).

FPD Lumberjack 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

FPD FPD BLOCK READOUT AND TRIGGER CHAINS

FPD 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 PMTs, 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 MAPMTs. 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 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.

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

FPD SOFTWARE 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

FPD Single 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.

FPD Alignment 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

FPD 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

FPD

Hit Reconstruction This event (from Engineering Run data) represents a hit in our detector at the location: x d = 5.6 mm y d = 3.8 mm

FPD Pot Motion Tests Initially pot motion tests restricted to end of stores, so progresss slow Eventually gained confidence of BD, allowed to insert pots anytime

FPD Conclusions 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!