# Presentation: 328284

## FPD STATUS

- Carlos Avila
- Uniandes/UTA

-  FPD overview
-  Roman pot and detector status
-  FPD readout integration status
-  Software status
-  Stand-alone DAQ

## DØ Forward Proton Detector

- 18 Roman Pots with scintillating fiber detectors:
- 1 Dipole spectrometer
- 8 Quadrupole spectrometers.

**DØ Forward Proton Detector**

- Carlos Avila, Uniandes/UTA

**FPD provides the capability of tracking the P or      scattered in a diffractive collision.**

## VETO COUNTERS

- VETO COUNTERS  5.2<<5.9
- LM      COUNTERS  2.5< < 4.4
- Used for triggering on rapidity gaps.

## DIFFRACTION THESIS TOPICS

## THE DETECTOR

** ****Six planes of fibers:**
**(U,U’,V,V’) ******** 20 channels; (X,X’) ******** 16 channels**
**(’) planes offset by 2/3 fiber**
** ****Total channels per detector = 112;  4 fibers (800 ********m)/channel**
** ****one LMB fiber (250 ********m) per channel**
** ****80 ********m theoretical resolution**
** ****7 MAPMT’s (H6568)  to readout one detector**

## DETECTOR ASSEMBLY

**DETECTOR ASSEMBLY**

- 1 MAPMT PER FIBER PLANE

- DETECTOR CARTRIDGES

## ROMAN POTS AND DETECTOR  STATUS

-  **17 Roman pots are installed**. A2U roman pot: removed to fix vacuum leak, will be re-installed in Jan. 2003 shutdown.
-  **9 Scintillating Fiber detectors and 3 Pseudo detectors already installed. **
**PHASE I** = 10 sci. fi. Detectors. (essentially complete by end of October)
**PHASE II** = Install remaining 8 sci. fi. Detectors  still need $80k for MAPMT’s

## POT INSERTION AND MONITORING

**Pot motion commands**

**Insertion steps**

**Monitoring through Acnet**

** ****Pot motion system has been tested extensively and shown to be reliable. All pots with detectors are routinely inserted.**
** ****Working towards automatic pot insertion****.**

**STATUS**

## TRIGGER ELECTRONICS

**Trigger electronics requirements**

-  3 AFE boards to read out vertical spectrometers and dipoles
-  2 AFE boards to read out horizontal spectrometers
-  1 Sequencer , 1 VRB, 3 DFE’s

##  Transition Patch Panel (TPP): Interface to AFE.

- - **Decouples tunnel and Platform grounds. **
**– ****Shapes FPD signals to operate within dynamic range of AFE.   **
-  **FPD SEQUENCER** :
**FPD signals delayed by long TOF and cables. FPD sequencer delays AFE controls.**
**Sequencer can handle only two delays. Third delay will be produced in AFE firmware.**

| Detector | Cable delay | TOF | Total Delay |
| --- | --- | --- | --- |
| A1,P1 | 236 ns |  77 ns |  313 ns |
| A2, P2 | 471 ns |  103 ns |  574 ns |
| D1,D2 | 444 ns |  190 ns | 634 ns |

## FPD INTEGRATION STATUS

- Dipole detectors have been connected through AFE readout chain. Final issues with database are being addressed. Commissioning  of our first AFE board will proceed during October 2002.
-  Unpacking of FPD signals through AFE has been implemented. Working on FPD examine.
-  2 more AFE’s expected to be installed in November 2002 to complete FPD Phase I readout integration.
-  DFE firmware has been implemented and is being tested. DFE boards are being stuffed.
- Trigger manager commissioning will proceed in parallel with DFE commissioning
- LM TDC boards are needed to include our trigger scintillators in the trigger manager. Important issue for FPD

## SOFTWARE STATUS

-  **MCPP diffractive event generator and FPD detector simulation complete. Trigger simulation starting.**
**Unpacking complete for one AFE board. Working on data base for geometry, calibration, trigger electronics.**
** ****Track reconstruction program for single track events complete and  being tested with stand alone DAQ.**
** ****Need to include FPD information into DST and thumbnail.**
** ****FPD analyze is being implemented and tested with stand-alone DAQ.**
** ****Significant amount of FPD software included in P13.**

## Stand Alone DAQ

-  This is a backup DAQ while integration to DØ is being completed.
-  Capability for reading out only two fiber detectors.
-  Elastic and Diffractive triggers implemented.

## FIBER ADC DISTRIBUTIONS

## ELASTIC TRIGGER DATA

- X,Y detector correlations

- X resolution

-  Distribution

-  t Distribution

## TRIGGER SCINTILLATORS TDCs

**From TDCS :**
- 18ns = (396ns – L1/c) – L1/c
-  4ns = (396ns – L2/c) – L2/c
-  **L1 = 56.7 m; L2 = 58.8 m**

**Tevatron Lattice:**
**L1 = 56.5m; L2 = 58.7m**

## FPD OPERATIONS

-  We have had CAL/FPD combined shifts during September for day and evening shifts. We are starting now 24 hours with Cal shifters. FPD expert on call.
-  We have had delays fixing problems in our hardware in the tunnel because tunnel accesses are not being granted very often (t = 3 to 4 weeks).
-  We are planning to install an air compressor system to blow fresh air to our detectors in order to reduce High He levels.
-  Information of TLD badges installed at our detector locations indicates that radiation levels  at our detectors are not an issue for a long operations period.
-  Some stores have high halo rates which limit pot insertion (Under study).

## CONCLUSIONS

- FPD phase I is nearly completed.  Completion of Phase II  depends on funding.
-  We have made a lot of progress towards integration into DØ. Commissioning of dipole detectors through AFE during October. Other 2 TPP and AFE boards to be installed during November. Expected completion of readout integration during the next two months.
-  We need TDC vertex boards soon to be able to incorporate LM and VC signals into FPD trigger manager.
-  Stand-alone DAQ has been very useful for understanding our detectors. We will keep taking data with it until we are fully integrated into DØ. We expect to have Elastic + diffractive dN/dt and  distributions by the end of 2002.
-  If you are interested in contributing to one of our physics topics, talk to the QCD conveners.