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All documents listed below are in the Portable Document Format (PDF).
Viewing the documents requires Acrobat Reader version 3 or later, available
for free from www.adobe.com.
microDXP - Product Brochure
(PDF format, 192KB, August 2002)
microDXP RS-232
Development Kit Manual v2.3.1
(PDF format, 1.4MB, 7/2/2008)
Contains instructions for getting started with the microDXP using the
development kit interface and microManager software
microDXP
Technical Reference Manual v1.0.7
(PDF format, 1.9MB, 7/7/2008)
Covers the microDXP x-ray processor in greater detail for advanced users.
microDXP
RS-232 Communications Specification
(PDF format, 89KB, 3/52008) -
Specifies the standard RS-232 command set
Handel/microDXP Quick Start Guide
(ZIP archive, 30KB, 2/3/2004)
A brief introduction to using Handel with the microDXP. The zip archive includes the guide in PDF format,
with sample source code and initialization file.
Handel Specification
(PDF format, 192KB, updated 7/1/2002)
Specification for the Handel hardware description layer for XIA digital pulse processors
XerXes: Host Software
Specification: hardware layer for all XIA digital pulse processors
(PDF format, 907KB, Feb 2002)
Handel SCA application note
(PDF format, 132KB, 12/18/2003)
Describes for Handel users how SCAs are implemented in the DXP, and is provided
with sample code (ZIP archive,
2KB, 12/18/2003) to help getting started using SCAs. SCAs are only supported
Handel release 0.4.1 and firmware release 1.08 and later. Please first download
and install the latest firmware release
appropriate to your DXP product and detector/preamplifier.
Pileup Inspection and Deadtime in the
DXP-4C
(PDF format, 208KB, 11/24/1997)
Abstract:This Note answers some commonly asked question about how the
pileup inspection in the DXP-4C works, and how should the deadtime corrections
be implemented by experimenters using this and similar instruments from
XIA.
Answers to Common Questions about the
DXP-4C
(PDF format, 16KB, 11/24/97)
Abstract: This Note answers many general commonly asked question about
the DXP-4C and similar instruments from XIA.
Please visit the MicroDXP Software
page for brief descriptions and screen shots or use links below to download
files directly. Right-click and select "Save Target As..."
to download the archived files:
microManager v2.2.15
(ZIP archive, 6.7MB, 8/1/2008)
This software release contains many improvements and bug fixes to the previous
microManager software (v2.2.10). See the changelog
for details. Note that the most recent manuals are included (located in the
folder "C:\Program Files\xia\microManager 2.2\docs")
Handel DLLs - microDXP Only
(ZIP archive, 1.0MB, updated 9/22/2004)
This distribution contains only the DLLs required to use Handel with the microDXP hardware.
If you use Handel with other XIA products, in addition to the microDXP hardware, you need
to download the release that contains all of the DLLs. Please refer to the
source installation guide
(PDF format, 83KB, 9/24/2004) for help. See the change log
(text file, 24KB, 9/24/2004) for help. See the for a list of changes implemented in this release.
Handel DLLs - All Products
(ZIP archive, 3.5MB, updated 9/22/2004).
This distribution contains all of the DLLs required to run Handel on Windows. If you
are not sure which version of Handel you need (on Windows), download this version.
Please refer to the installation guide
(PDF format, 83KB, 9/24/2004) for help. See the
change log
(text file, 24KB, 9/24/2004) for a list of changes implemented in this release.
Handel - Source Only
(ZIP archive, 578KB, updated 9/22/2004).
This distribution contains only the Handel source and is targeted at users running
on an OS other then Windows, such as Linux. Please refer to the source
installation guide (PDF format, 83KB, 9/24/2004) for help. See the change
log (text file, 24KB, 9/24/2004) for help. See the for a list of changes
implemented in this release.
Please contact the MicroDXP team at 
for the most recent firmware.
CHELSI: A PORTABLE NEUTRON SPECTROMETER
FOR THE 20- 800 MEV REGION
T.D. McLean, R.H. Olsher, L.L. Romero, L.H. Miles, R.T.Devine, A. Fallu-Labruyere,
P. Grudberg
(PDF format, 491 KB in size)
ABSTRACT: CHELSI is a CsI-based portable spectrometer being developed at Los Alamos National Laboratory for use in highenergy
neutron fields. Based on the inherent pulse shape discrimination properties of CsI(Tl), the instrument flags
charged particle events produced via neutron-induced spallation events. Scintillation events are processed in real time
using digital signal processing and a conservative estimate of neutron dose rate is made based on the charged particle
energy distribution. A more accurate dose estimate can be made by unfolding the 2D charged particle versus pulse height
distribution to reveal the incident neutron spectrum from which dose is readily obtained. A prototype probe has been
assembled and data collected in quasi-monoenergetic fields at the The Svedberg Laboratory (TSL) in Uppsala as well as
at the Los Alamos Neutron Science Center (LANSCE). Preliminary efforts at deconvoluting the shape/energy data using
empirical response functions derived from time-of-flight measurements are described.
Towards Digital Gamma-Ray and Particle
Spectroscopy
W. Skulski, M.Momayezi, B.Hubbard-Nelson, P.Grudberg, J.Harris, W.Warburton
(PDF format, 237 KB, 10/4/1999)
Abstract: Digital spectroscopy is an experimental technique
for directly processing detector signals without analog signal shaping.
Digital spectrometers capture the detailed shape of preamplifier signals
with high speed ADCs, and then process captured waveforms in real
time with field--programmable gate arrays and digital signal processors,
that perform digitally all essential data processing functions, including
precise energy measurement and event timing, ballistic deficit correction,
pulse shape analysis, and time stamping the output data for offline
analysis. Applications of this novel technology include position sensitive
gamma-ray spectroscopy with arrays of Ge detectors and high-speed
particle emission spectroscopy. In both applications digital spectrometers
process signals from semiconductor detectors in order to measure the
interaction energy, time, and location within the detector volume.
Excellent energy resolution and essentially zero dead time can be
easily obtained with XIA digital spectrometer devices, even when time
separation between consecutive events in a decay chain is shorter
than 1 microsecond. These and other applications of digital spectroscopy
are at the frontier of experimental nuclear chemistry and nuclear
physics.
Digital Spectrometer For Automating
XAS Data Collection
W.K. Warburton, B. Hubbard & C. Zhou
(PDF format, 387 KB, 1999)
Abstract: Energy dispersive x-ray fluorescence is a well developed
experimental technique for studying both the atomic composition of
unknowns (fluorescence analysis) and the atomic structure of matter
at the atomic level (EXAFS). In order to assist researchers interested
in extending their capabilities with multi-element detectors, X-ray
Instrumentation Associates recently introduced the DXP- 4C which contains
4 complete channels - amplifier through MCA - of electronics in a
single width CAMAC module. Using these new electronics can improve
throughput considerably, compared to either an conventional analog
SCA system or a multiplexed MCA system, while also allowing complete
computer control of all parameters. This new module allows even detector
arrays with large numbers of elements to be instrumented very compactly.
The paper describes both the architecture of the DXP electronics and
its various applications.
Time Resolved XAS Data Collection
With an XIA DXP-4T Spectrometer
W.K. Warburton, B. Hubbard, C. Zhou & C. Booth
(PDF format, 82 KB, 1999)
Abstract: Time resolved experiments can be divided into two
categories: single shot experiments and cyclically repetitive experiments.
The former can only be carried out once per sample, the experiment
typically either destroys the sample or transforms it into a new state
from which it is difficult to return to the original. Chemical reactions
often fall into this category. Cyclically repetitive experiments,
on the other hand, are carried out on materials can be returned to
their starting state, allowing the experiment to be repeated as often
as necessary to collect data of interest. Many mechanical, electrical,
and phase equilibrium experiments fall into this category. Biological
systems may fall into either category. The DXP-4T, a recently introduced,
modified version of the DXP-4C Digital X-ray Spectrometer, can be
applied to XAS studies of either class of cyclically repetitive experiment.
The paper discusses time-resolved XAS research opportunities with
XIA's DXP-4T digital X-ray spectrometer.
Our publications and notes can be downloaded in
the Portable Document Format (PDF) from the XIA's Internet site www.xia.com.
In order to request printed copies, please send an e-mail to  ,
or please call the company directly. XIA's full contact information
can be found on the contact page www.xia.com/contact.html.
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