FPD FPD 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 P 2Q Q4Q4 S Q2Q2 Q2Q2 Q3Q3 Q3Q3 Q4Q4 S A1U A2U A1D A2D P1U P2U P1DP2D D1 Detector 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 Quadrupole castle A2 installed in the beam line. Castle Status

FPD 4 fiber bundle fits well the pixel size of H Ch. MAPMT (Multi- Anode Photomultiplier Tube) 7 PMT’s/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 Detector Setup

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

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 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 Cartridges

FPD The plastic frames containing the other end of the fibers are 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 A2 station with cartridges mounted in the vertical plane Installed 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 were grouped according to their characteristics In February the installation of the remaining four detectors of Phase I will be completed Cartridge 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 COUNTERS

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

FPD 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.

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 location

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 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 FPD BLOCK READOUT AND TRIGGER CHAINS

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 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 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).

FPD View of the Small Control Room used for the Standalone 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 …

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 Solutions

FPDRESULTS Spectra for plane U in the detector P2D with Pedestal subtraction and TDC cuts Elastic ADC Distribution

FPD Hit distribution for detector 1 plane by plane

FPD Multiplicity distributions per each plane in both detectors

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

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

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 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! CONCLUSIONS

FPD 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)