Engineering topics
Israelsson, Ulf
Publications and source records attributed to Israelsson, Ulf.
Atomic Test Mass and Atom Interferometry for Inertial Sensing and Gravity Measurements in Space
UNKNOWN
NASA Fundamental Physics Workshop 2016, Session 9: International Collaborations Forum
No abstract available
OBPR Free Flyer draft roadmap overview
OBPR Free Flyer Roadmap Purpose is to describe the OBPR research which is enabled by a free flying spacecraft capability To illustrate how research performed on free flying spacecrafts complement current and planned OBPR ISS activities.
Proceedings of the 2004 NASA/JPL Workshop on Physics for Planetary Exploration
The conference was held April 20-22, 2004, the NASA/JPL Workshop on Physics for Planetary Exploration focused on NASA's new concentration on sending crewed missions to the Moon by 2020 and then to Mars and beyond. However, our ground-based physics experiments are continuing to be funded, and it will be possible to compete for $80-90 million in new money from the NASA exploration programs. Papers presented at the workshop related how physics research can help NASA to prepare for and accomplish this grand scheme of exploration. From sensors for water on the Moon and Mars, to fundamental research on those bodies, and to aids for navigating precisely to landing sites on distant planets, diverse topics were addressed by the Workshop speakers.
Fundamental Physics Changes in Response to Evolving NASA Needs
Change continues in the NASA environment. The need for access to space for physicists is growing if we are to fruitfully address today s challenging questions. A new Roadmap is required to demonstrate the importance of our program to stakeholders. Our investigators must continue to advocate the benefits of our program: a) To NASA and Congress; b) To the scientific community; c) To students; d) To the general public. Our investigators must seek ways to use their advanced technology to support a human presence in space and to develop improved Earth applications.
OBPR Product Lines, Human Research Initiative, and Physics Roadmap for Exploration
The pace of change has increased at NASA. OBPR s focus is now on the Human interface as it relates to the new Exploration vision. The fundamental physics community must demonstrate how we can contribute. Many opportunities exist for physicists to participate in addressing NASA's cross-disciplinary exploration challenges: a) Physicists can contribute to elucidating basic operating principles for complex biological systems; b) Physics technologies can contribute to developing miniature sensors and systems required for manned missions to Mars. NASA Codes other than OBPR may be viable sources of funding for physics research.
Splinter session instructions
Explore the source record for details and available documents.
The Potential OBPR Free Flyer Platform and Fundamental Physics
Contents include the following: Overview of the Free Flyer augmentation request. Importance from a fundamental physics perspective. Summary. Group Discussion.
Fundamental Physics Changes in Response to Evolving NASA Needs
To continue growing as a discipline, we need to establish a new vision of where we are going that is consistent with today s physics, NASA s strategic plan, and the new OBPR direction. 1998 Roadmap focused exclusively on Physics, and did not worry about boundaries between OBPR and OSS. Updated Roadmap: Must incorporate some strategic research activities to be fully responsive to the current OBPR direction. Must capture the imagination of OBPR leadership, OMB, and Congress. Must delineate OBPR from the "beyond Einstein" program in OSS. Must address relevancy to Society explicitly. Status of the Roadmap development will be discussed after lunch today. Seeking community inputs and endorsement. Draft update targeted for June, final in August.
Research Opportunities on the Low Temperature Microgravity Physics Facility (LTMPF) on the International Space Station
The Low Temperature Microgravity Physics Facility (LTMPF) is a state-of-the-art facility for long duration science Investigations whose objectives can only be achieved in microgravity and at low temperature. LTMPF consists of two reusable, cryogenic facilities with self-contained electronics, software and communication capabilities. The Facility will be first launched by Japanese HIIA Rocket in 2003 and retrieved by the Space Shuttle, and will have at least five months cryogen lifetime on the Japanese Experiment Module Exposed Facility (JEM EF) of the International Space Station. A number of high precision sensors of temperature, pressure and capacitance will be available, which can be further tailored to accommodate a wide variety of low temperature experiments. This paper will describe the LTMPF and its goals and design requirements. Currently there are six candidate experiments in the flight definition phase to fly on LTMPF. Future candidate experiments will be selected through the NASA Research Announcement process. Opportunities for utilization and collaboration with international partners will also be discussed. This work is being carried out by the Jet Propulsion Laboratory, California Institute of Technology under contract to the National Aeronautics and Space Administration. The work was funded by NASA Microgravity Research Division.
Helium-4 Experiments near T-lambda in a Low-Gravity Simulator
We report our studies of gravity cancellation in a liquid helium sample cell along the lambda-line using a low-gravity simulator facility. The simulator consists of a superconducting magnet capable of producing B(delta-B/delta-z) = 22squareT)/cm. We have verified experimentally that the simulator can cancel gravity to about 0.01g in a cylindrical sample volume of 0.5 cm in diameter and 0.5 cm in height. This allows us to approach more closely the superfluid transition without entering the normal-superfluid two phase region induced by gravity. We also present the measurements of T-c(Q,P): depression of the superfluid transition temperature by a heat current(Q) along the lambda-line (P). The results are consistent with the Renormalization-group theory calculation. Measurements of thermal expansion coefficient in a heat current will also be discussed. The work has been carried out by JPL, California Institute of Technology under contract to NASA.
Measurements of Tc (Q,P): Depression of the Superfluid Transition Temperature by a Heat Current Along the Lambda Line
We report experimental measurements of Tc (Q,P) for heat currents (Q) between I1and 100 micro W/sq cm and pressure (P) between SVP and 15 bar. The measurements were performed in a normal gravity environment, using the low-gravity simulator facility at JPL without the magnet being energized. The sample pressure was controlled to 0.1 micro bar using a hot volume, and a Straty-Adams capacitive pressure gauge. The total volume of helium in the sample cell and the hot volume was held constant using a pneumatic low temperature valve. A melting curve thermometer (MCT) measured the transition temperature (Tc) with a resolution of about 10 nK through a sidewall probe of the thermal conductivity sample cell. We employed the same measurement technique and procedure described by DAS. Preliminary results indicate that Tc (Q,P) depends very little on the pressure in the pressure range between SVP and 15 bar with a variation in the amplitude of Tc(Q,P) of less than about 5% observable in this pressure range. According to the Renormalization-group theory calculation by Haussmann and Dohm, the amplitude of Tc (Q,P) has a leading pressure-dependence term proportional to xi(sub 0) (sup (1/nu)), where xi(sub 0) is the correlation-length amplitude and nu is the correlation-length exponent. Thus, a small pressure dependence of the amplitude of Tc (Q,P) is expected since xi(sub 0) is very weakly dependent on pressure between SVP and 15 bar, consistent with our measurements.