Status of the LANL Activities in the Field of RF Superconductivity. Page: 1 of 5
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
The 10th Workshop on RF Superconductivity, Tsukuba, Japan, September 6-11, 2001.
STATUS OF THE LANL ACTIVITIES IN THE FIELD OF RF
SUPERCONDUCTIVITY*
T. Tajimat, K. C. D. Chan, R. L. Edwards, R. C. Gentzlinger, W. B. Haynes, J. P. Kelley,
F. L. Krawczyk, J. E. Ledford, M. A. Madrid, D. I. Montoya, P. L. Roybal, E. N. Schmierer,
D. L. Schrage, A. H. Shapiro, LANL, Los Alamos, NM 87545, USAAbstract
Since the last workshop we have tested six j=0.64, 700
MHz, 5-cell elliptical superconducting cavities in
collaboration with JLAB in vertical cryostats. All the
cavities exceeded the requirements for Accelerator
Production of Tritium (APT) (Qo = 5 x 109 at F-,, = 5
MV/m) with ample margin. The lo w-field Qo at 2 K was
2-3 x 1010 and the maximum accelerating field reached 12
MV/m, which corresponds to peak electric and magnetic
fields of 41 MV/m and 835 Oe, respectively. Power
couplers have also been tested in a test bench up to over 1
MW. Since the APT project has transitioned to Advanced
Accelerator Applications (AAA) project, a new type of
superconducting accelerating structure called spoke cavity
emerged as an excellent candidate for the low energy
sections between the RFQ and the elliptical cavities. We
tested a j=0.29, 340 MHz, 2-gap spoke cavity on loan
from Argonne National Laboratory. The results showed
Qo = 2 x 109 at low fields and a maximum accelerating
field Ia,, = 12.5 MV/m at 4 K. At 5 MV/m, the Qo was
1.5 x 109. Encouraged by these results, we started
fabricating some spoke cavities and are planning to test
one of them in the beamline of LEDA (Low Energy
Demonstration Accelerator) in the future.
1 INTRODUCTION
Facilities for preparation and testing of superconducting
cavities at LANL were upgraded by the time of last
workshop to test the j = 0.64, 700 MHz, 5-cell cavities
prototyped for APT project [1].
Using these new facilities at LANL and the facilities
used for CEBAF at JLAB, six 5-cell cavities have been
tested [2-4]. The APT couplers also continued to be tested
after we reported the achievement of 1 MW CW traveling
wave in the last workshop [5-7].
In addition, we started studies on spoke cavities for
low-energy sections of the accelerator being planned for
the new AAA project (see next section) [8-11]. Since
details of each work have been reported elsewhere, we
summarize our activities briefly in this report.
2 AAA PROGRAM
* Work supported by the US Department of Energy
t tajima@lanl.govAdvanced Accelerator Applications (AAA) is a new
LANL-led multi-laboratory project that started in FY01
[12, 13].
The Accelerator Production of Tritium (APT) project
has transitioned to this new project since it was decided
that an accelerator would be a back up to light water
reactors for tritiumproduction.
The main objective of this new project is to demonstrate
the practicality of accelerator transmutation of nuclear
waste. The centerpiece of this program is Accelerator-
Driven Test Facility (ADTF), which will be a high-power
CW proton linac of >20 MW [14].
Although not decided yet, its energy and current will be
- 600 MeV and - 33 mA, respectively. If it will be
expanded for APT capability, the current will be 100 mA.
3 SUPERCONDUCTING RFACTIVITIES
3.1 Elliptical Cavities for High-Energy Sections
We started testing the j = 0.64, 5-cell APT cavities in
early 2000 at both LANL and JLAB. Figure 1 shows one
of the six cavities set on the cryostat insert before testingat liquid helium temperature.
_ 4C
91;
P firqFigure 1: APT 5-cell cavity set on the cryostat insert.
Details of the tests are described in [2-4].LA-UR-01-4988
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Tajima, T. (Tsuyoshi); Roybal, P. L. (Phillip L.); Chan, K. D. (Kwok-Chi D.); Schmierer, E. N. (Eric N.); Edwards, R. L. (Randall L.); Schrage, D. L. (Dale L.) et al. Status of the LANL Activities in the Field of RF Superconductivity., article, January 1, 2001; United States. (https://digital.library.unt.edu/ark:/67531/metadc928408/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.