abstract

A recently proposed method of studying the long-range correlations in multiparticle production is described. It is explained how it can be used in practice to uncover the mechanisms of particle production in high energy collisions.

abstract

The Large Area Picosecond Photodetectors described in this contribution incorporate a photocathode and a borosilicate glass capillary Micro-Channel Plate (MCP) pair functionalised by atomic layer deposition (ALD) of separate resistive and secondary emission materials. Initial testing with matched pairs of small glass capillary test disks has demonstrated gains of the order of \(10^5\)–\(10^6\). Compared to other fast imaging devices, these photodetectors are expected to provide timing resolutions in the 10–100 ps range, and two-dimension position in the sub-millimeter range. If daisy chained, large detectors read at both ends with fast digitising integrated electronics providing zero-suppressed calibrated data should be produced at relatively low cost in large quantities.

abstract

In this paper, the gas Cherenkov detector with radiofrequency phototube is considered as a fast-timing detector for FP420 project. The detector serves for precise Time-of-Flight measurements of forward going protons, capable of accurate vertex reconstruction and background rejection at high luminosities. The proposed technique is a high resolution (\(\sim \) 5 ps FWHM for a single proton), high rate (\(\sim \) MHz) and highly stable (less than 1 ps) timing technique capable to detect up to several tens events in a short (\(\sim \) 1 ns) time interval.

abstract

We describe here the outlines of research undertaken by Fermilab into timing characteristics of photodetectors. We describe our experimental method and give benchtop results on the timing resolution of micro-channel plate photomultipliers (MCP-PMT) and silicon photomultipliers (SiPM). In addition, we describe results of various configurations of these detectors, along with quartz radiators, in particle test beams at Fermilab. Results for timing of scintillator light using the DRS4 high speed digitizer are also presented.

abstract

In the context of the Large Area Picosecond Photodetector (LAPPD) project the motivation to measure time-of-flight at the picosecond resolution has pushed towards a faster signal rise-time (below 100 ps) and a higher bandwidth output (higher than 1 GHz) detector, thus, leading to a new signal development and integrity studies of Micro-Channel Plates (MCP) photo-detectors. Similarly, the signal path, is being simulated and characterized, from the anodes to the input of the readout electronics, to minimise losses. Furthermore, to acquire the detector fast pulses a new 10 Gs/s high input bandwidth, 130 nm CMOS sampling chip is being developed.

abstract

A prototype transceiver ASIC for fast serial data transmission in luminosity detector (LumiCal) at the future International Linear Collider (ILC) was designed and fabricated in the AMS \(0.35~\mu \)m technology. The purpose of the design was to develop a transceiver allowing serial readout of LumiCal detector data up to a highest possible frequency and working in a wide frequency range. The designed ASIC comprises both the transmitter and the receiver circuits. Preliminary measurements showed that both circuits are fully functional and reach the data transmission rates up to about 1 Gb/s. This work presents the transceiver design and the results of preliminary measurements.

abstract

In future linear colliders like CLIC, where the period between the bunch crossings is in a sub-nanoseconds range (\(\sim 500\) ps), an appropriate detection technique with triggerless signal processing is needed. In this work we discuss a technique, based on deconvolution algorithm, suitable for time and amplitude reconstruction of an event. In the implemented method the output of a relatively slow shaper (many bunch crossing periods) is sampled and digitalised in an ADC and then the deconvolution procedure is applied to digital data. The time of an event can be found with a precision of few percent of sampling time. The signal to noise ratio is only slightly decreased after passing through the deconvolution filter. The performed theoretical and Monte Carlo studies are confirmed by the results of preliminary measurements obtained with the dedicated system comprising of radiation source, silicon sensor, front–end electronics, ADC and further digital processing implemented on a PC computer.

abstract

The results of the study of time resolution of scintillation detectors based on LSO crystal coupled to photomultipliers and silicon photomultipliers are reviewed. The aim of the paper is to understand an influence of different parameters of crystals and photodetectors on time resolution.

abstract

I discuss the development of high precision timing detectors for high momentum protons at the LHC, and their application in studying exclusive Higgs boson production.

abstract

Precise TOF counters are employed by AFP to reduce pile-up background in the forward proton spectrometers. It is expected that at the highest LHC luminosity up to \(\sim 35\) interactions occur at the same bunch crossing in ATLAS. A precision of the order of few mm (\(\sim 10\) ps) or better is required to adequately distinguish the vertex of interest — from which the unbroken scattered protons originate — from other pile-up vertices, with good efficiency. The development and testing of the QUARTIC precision TOF detector and its readout is described. This detector utilizes fused-silica radiators readout by Micro-Channel Plates Photomultipliers. The front-end readout electronics is based on the High Precision Time to Digital Converter (HPTDC).

abstract

Fast timing detectors are used in muon cooling experiments to improve measurements of the muon momentum for determination of emittance reduction properties of muon cooling channels that are a necessary element of muon colliders and neutrino factories. Examples of their use are presented.

abstract

After defining briefly the diffractive processes, we describe the two main physics motivation of the ATLAS Forward Physics Project, namely the diffractive Higgs production and the anomalous couplings between \(\gamma \) and \(W\) or \(Z\) at the LHC. We finish the report by describing the project itself.

abstract

The DIRC-like FTOF detector is a ring imaging Cherenkov counter which uses Time-of-Flight to identify charged particles. A prototype of such device was constructed and installed in the SLAC Cosmic Ray Telescope for timing measurement. A time resolution of about 90 ps/channel was obtained, in agreement with simulation. To estimate the different contributions to the single channel time resolution, a precise simulation of the whole system (detector + MCP-PMT) was written. For this experiment we use the new 10 ps 16-channel USB wave catcher electronics developed by LAL (CNRS/IN2P3) and CEA/IRFU. In this paper, preliminary results of the test ongoing at SLAC are presented. This work is done in collaboration with N. Arnaud, D. Breton, J. Maalmi, V. Puill, A. Stocchi from LAL and D. Aston, J. Va’vra from SLAC.

abstract

Development of a new type RICH counter named “TOP counter” for Belle II experiment is reported. The device is based on the MCP-PMT. Progress on the square-shape MCP-PMT used to expand the sensitive region is described. A study of the QE stability of this new MCP-PMT is reported and the ways how to improve its lifetime are explained. New device reaches the lifetime of 2.5 C/cm\(^2\) for the 80% of original QE with the \(2.0 \times 106\) gain.

abstract

In this paper \(\gamma \)-detector, based on the radiofrequency (RF) phototube and recently developed fast and ultrafast scintillators, is considered for Time-of-Flight positron emission tomography applications. Timing characteristics of such a device has been investigated by means of a dedicated Monte Carlo code based on the single photon counting concept. Bi-exponential timing model for scintillators have been used. The calculations have shown that such a timing model is in a good agreement with recently measured data. The timing resolution of \(\gamma \)-detectors can be significantly improved by using the RF phototube.