Development of Rebunching Cavities at IAP

A focus of work at IAP has been the development and optimization of spiral loaded cavities since the 1970s [A. Schempp et al, NIM 135, 409 (1976)]. These cavities feature a high efficiency, a compact design and a big variety of possible fields of application. They find use both as bunchers and post accelerators to vary the final energy of the beam. In comparison to other available designs, the advantage of these structures lies in their small size. Furthermore they can easily be tuned to the required resonance frequency by varying the length of the spiral. Due to the small size of the cavities the required budget can also be kept low. Here, two slightly different types of spiral loaded cavities, which were built for the REX-ISOLDE project at CERN and the intensity upgrade program at GSI are being discussed.Comment: 4 pages, 9 figures PRST-AB special LINAC 2000 edition with additional information in comparison to the 3 pages LINAC paper physics/000708

Design of the 7 MeV/u, 217 MHz Injector Linac for the Proposed Ion Beam Facility for Cancer Therapy at the Clinic in Heidelberg

A dedicated clinical synchrotron facility for cancer therapy using energetic proton and ion beams (C, He and O) has been designed at GSI for the Radiologische Universitaetsklinik at Heidelberg, Germany. The design of the injector linac is presented. Suitable ion sources are discussed and results of ion source test measurements are reported. The LEBT allows for switching between two ion sources. A short RFQ accelerates the ions from 8 keV/u to 400 keV/u. It is followed by a very compact beam matching section and a 3.8 m long IH-type drift tube linac for the acceleration to 7 MeV/u. Both rf structures are designed for a resonance frequency of 216.816 MHz and for ion mass-to-charge ratios up to A/q = 3 (12C4+, (H_3)+, 3He+, 16O6+).Comment: Contribution to the LINAC2000 Proceedings, Paper ID: MOD1

SLIDES: Modifying Prior Appropriation: The Spectrum of Experiences

Presenter: Adam Schempp, Environmental Law Institute, Washington, DC 12 slide

A detected feature at the expected wavelength for the HD R5(0) line in Jupiter's and Uranus' atmospheres

A feature was detected at the expected wavelength for the HD R5(0) line in Jupiter's and Uranus' atmospheres. An upper limit for Neptune was also found. Added to the earlier detection of a similar feature for Saturn, it is proposed that all evidence from this type of measurement can be interpreted as arising from a D/H ratio of about .0004 for all the major planets. This value is not in agreement with measurements from CH3D transitions, and is at least fifty times the accepted interstellar medium value of 5 x .000001, implying deuterium enhancement in the solar system via fractionation in the proto-solar nebula

SLIDES: Modifying Prior Appropriation: The Spectrum of Experiences

Presenter: Adam Schempp, Environmental Law Institute, Washington, DC 12 slide

A Community Re-Integration Manual for Individuals with Amputations: Preparing for the Paralympics

Being an athlete with an injury is difficult, but an amputation poses even more challenges to one\u27s life dreams for sports competition. This scholarly project focused on advancing an athlete\u27s community re-integration, specifically back into the sporting community. Presently, there is a gap in existing occupational therapy services for persons with amputations between the completion of inpatient rehabilitation and the return to full community re-integration, particularly for the sports competitor. This scholarly project product is a manual of sequential therapeutic activities for athletes who have the goal of returning to the occupation of sports participation. This product is intended to guide occupational therapists in working with athletes who have amputation and wish to fully re-integrate into the community, including competition in sports challenges such as the Paralympics. The procedure included gathering of information through a review of the literature. This review included articles on amputation and relevant rehabilitation aspects, the Paralympics, and the occupational therapy rehabilitation process for persons post-amputation. The expansion of OT services for persons post-amputation who have the desire to return to a competitive sports participation role was developed for this scholarly project product. This scholarly project included the following findings. A team approach is recommended for an individual with an amputation to have the best recovery (Kent & Fife, 1999). An individual with an amputation can have a low balance confidence and may be afraid of falling. Knowledge of this allows clinicians a better understanding of the events an individual with an amputation may go through (Miller & Deathe, 2004). An individual\u27s level of participation in physical activity and sports may be affected by one\u27s body image. Clinicians that encourage sports participation as a part of rehabilitation may have increased sports participation in their clients (Wetterhan, Hanson, & Levy, 2002). An individual\u27s function with their wheelchair, their athletic discipline, and their capacity to train for hours explain and control the individual\u27s aerobic capacity (Woude, Bouten, Veeger, & Gwinn, 2002)

Fully non-contact, air-coupled generation and detection of ultrasound in concrete for nondestructive testing

It is well known that liquid coupling agents, which are commonly used in conventional ultrasonic testing to couple an ultrasonic transducer to a solid specimen, cause a number of problems including inconsistency in results and slowness of the inspection. This is especially true when the specimen surface is rough, such as those in field concrete structures; here the solution involves time-consuming surface preparation to polish every single point of inspection, making it impractical to inspect field structures with conventional, contact methods. To address this issue, this thesis proposes a new, fully non-contact, air-coupled measurement setup in the mid to high ultrasonic frequencies (50-150 kHz). This advanced setup and measurement technique is evaluated by calculating the signal to noise ratio for different numbers of signal averages. In addition, the effect of the lift-off distance of the transducer over the sample is also investigated. Ultrasonic waves are generated and detected in this frequency range with a sufficiently high signal to noise ratio (SNR), which enables performing a fast scan with a small number of signal averages. Using this setup, phase velocity and attenuation of Rayleigh surface waves in a concrete specimen are first measured. Then, the air coupled ultrasound technique is used to detect dicontinuities such as cracks at a concrete joint and reinforcement bars in a concrete block. Also, the capability of the proposed technique for measuring depths of surface-breaking cracks using air-coupled generated Rayleigh waves is demonstrated. Since this measurement setup directly generates Rayleigh waves, most of the disadvantages in the techniques based on the impact-echo method can be avoided and thus data processing is much simpler than that in the impact-echo based techniques. The results of the measurements show that this setup is highly promising and a big advancement towards the rapid ultrasonic nondestructive testing on large-scale field concrete structures.M.S