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CRYOGENIC SPECTROMETER PROTOTYPE. Rationale: - PowerPoint PPT Presentation
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XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Rationale:• Development and demonstration of technical readiness for future opportunities, like DIOS (JAXA, 2009) and NEXT (JAXA, 2012), XEUS/CON-X (ESA/NASA/JAXA, > 2015), ESTREMO (ASI, 2012) and small scale ground-based or balloon-borne opportunities in the Sub-mm
• Creation of a roadmap with a clearly specified near-term goal as a tool to create focus, enable useful participation of partners, and improve the strategic position of Europe (and SRON) in the field of cryogenic instrumentation
• Enabling an integrated performance tests at an X-ray radiation source facility
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Prototype elements:
• ADR cooler with radiation entrance window• X-ray transmission and IR – UV blocking filters for entrance window • ≥ 5 x 5 prototype sensor array• FDM read-out electronics representative for a space mission• Instrument control unit with control and data acquisition software• Data analysis software• Extensive system testing at suitable X-ray beams• Executed in 2005 – 2007 (3 years) in collaboration with suitable
partners• Parallel development and verification of key issues (research on
energy resolution and pixel size)
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Description of elements
1. ADR COOLER with ENTRANCE WINDOW
Could either be purchased from JANIS or CSP (Very Cold) or delivered by a partner (MSSL?)
Questions/requirements:
• Helium cooled or mechanically cooled system?
• Magnetic field shielding
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Description of elements
2. Sensor head design
Packaging of sensor array, LC-filters and SQUIDs on coldfinger
3. Magnetic field generation and shielding (inside ADR)
4. X-ray entrance filters and IR – UV blocking filters
5. Harness and adequate EMI shielding/blocking
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Description of elements
6. Sensor Array
5 x 5 arrays are at present under development by SRON/MESA under an ESA TRP contract. Larger arrays might become available later as well
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Description of elements
7. Frequency Division Multiplexed read-out
Baseline at this moment is Base band Feedback. Is expected to be developed by SRON/VTT in a forthcoming ESA TRP contract
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Sub-elements of FDM are:
8. AC-bias sources have to be developed
The frequency range considered is 0.5 – 10 MHz and should be software tunable in frequency and amplitude Quality has to be 138 dBc. (SRON/Partner)
9. LC–filters operate cold and are made in thin film technology
Baseline is to have one bias frequency per row (option B). This will require tuning of the capacitors after measurement of the resonance frequency. The capacitors require high Q (660 – 4000)
(SRON/VTT/Partner)
10. SQUID-amplifier and base-band feedback loop (VTT)
• SQUID current amplifier with large dynamic range• Warm low-noise amplifier• SQUID-to-warm amplifier coupling (transformer, array SQUID, cold amplifier)• DEMUX and MUX with small delay. Trade-off between a digital DEMUX and MUX that can meet the required small delay and a fully analogue system is required
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Description of elements
Sub-elements of FDM are:
11. Demultiplexer of signal from baseband-feedback loop
Baseline is to down convert certain frequency bands of the data stream so that they can be digitized without loss of information. Subsequently the signals can become retrieved from the data-stream by digital multiplication with the carriers and subsequent filtering. (Partner)
XEUS cryogenic instrument 26 - 27 October 2004
CRYOGENIC SPECTROMETER PROTOTYPE
Description of elementsA. System requirements, design, and interfaces definitions. Integration
and testing (SRON)B. Data analysis
This part contains the optimized filtering algorithms for retrieval of the most accurate energy for each event and software for display and
handling of spectra, I – V curves, etc (Partner)C. Instrument Control
This combination of hardware and software is required to control the instrument, set bias voltages for sensors and SQUIDs, set modes,
etc. (SRON/partner)D. Project planning
XEUS cryogenic instrument 26 - 27 October 2004
Cryogenic Spectrometer PrototypeSummary table of links with existing efforts
Item Description Status
ADR Delivery by ESA/MSSL in CIS-contract
Now expected 2nd Q 2005
sensor mounting/harness
Leicester responsible in CIS-contract
On hold
5 x 5 detector arrays Under production in present CIS-contract
Fully wired arrays by 1stQ 2005
SQUIDs Will be produced in the forthcoming X-10 contract
Partly available already
Data acquisition unit Leicester will deliver that within CIS-contract
Not really started
Low level effort
XEUS cryogenic instrument 26 - 27 October 2004
Cryogenic Spectrometer PrototypeElements of the plan• Design derived from a design for a 32 x 32 array• Requirement goal are the XEUS requirements used so far or the XEUS
low-energy spectrometer specifications (TBD)• Count rate for the overall system < 500 c/s• System set-up should aim for a reasonable amount of modularity without
that becoming a cost driver• Readout of a > 5 x 5 array by a 4 x 8 or 2 x 16 FDM system• Default frequencies between 1 – 10 MHz. Frequency separation such
that low and high frequencies are present and close packing is tested• Harness should meet the thermal requirements for a mission like XEUS
and should allow for about twice the number of channels as defined above
• The system should be software controlled, have log files and an adequate amount of housekeeping information
• The design should be robust against EMI• The work should enable a serious participation of external partners• Period about 3 years
XEUS cryogenic instrument 26 - 27 October 2004
Cryogenic Spectrometer Prototype
Project flow• Specification of requirements
• System study for XEUS-type instrument in order to define the baseline system and sub-systems
• Definition of prototype system and sub-system elements, estimation of project size (manpower, cost, schedule) and division of work among partners
• Definition of interfaces, and sub-system requirements
• Design, fabrication, and tests of sub-units
• Integration of sub-units and performance tests on integrated systems
• Integrated science tests at X-ray radiation source
• Data analysis and reporting
XEUS cryogenic instrument 26 - 27 October 2004
Cryogenic Spectrometer Prototype