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Your search keyword '"Harms, E. R."' showing total 9 results
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9 results on '"Harms, E. R."'

1. Commissioning and Operation of FAST Electron Linac at Fermilab

Author

Romanov, A., Baffes, C., Broemmelsiek, D. R., Carlson, K., Crawford, D. J., Eddy, N., Edstrom Jr., D., Harms, E. R., Hurd, J., Kucera, M., Leibfritz, J., Rakhno, I., Reid, J., Ruan, J., Santucci, J., Shiltsev, V., Stancari, G., Thurman-Keup, R., Valishev, A., and Warner, A.

Subjects
Physics - Accelerator Physics
Abstract

We report results of the beam commissioning and first operation of the 1.3 GHz superconducting RF electron linear accelerator at Fermilab Accelerator Science and Technology (FAST) facility. Construction of the linac was completed and the machine was commissioned with beam in 2017. The maximum total beam energy of about 300 MeV was achieved with the record energy gain of 250 MeV in the ILC-type SRF cryomodule. The photoinjector was tuned to produce trains of 200 pC bunches with a frequency of 3 MHz at a repetition rate of 1 Hz. This report describes the aspects of machine commissioning such as tuning of the SRF cryomodule and beam optics optimization. We also present highlights of an experimental program carried out parasitically during the two-month run, including studies of wake-fields, and advanced beam phase space manipulation., Comment: 4 pp

Published
2018

2. Commissioning And First Results From The Fermilab Cryomodule Test Stand

Author

Harms, E. R., Awida, M., Baffes, C., Carlson, K., Chandrasekaran, S., Chase, B., Cullerton, E., Edelen, J., Einstein-Curtis, J., Ginsburg, C., Grassellino, A., Hansen, B., Holzbauer, J., Kazakov, S., Khabiboulline, T., Kucera, M., Leibfritz, J., Lunin, A., McDowell, D., McGee, M., Nicklaus, D., Orris, D., Ozelis, J., Patrick, J., Petersen, T., Pischalnikov, Y., Prieto, P., Prokofiev, O., Reid, J., Schappert, W., Sergatskov, D., Solyak, N., Stanek, R., Sun, D., White, M., Worel, C., and Wu, G.

Subjects
Physics - Accelerator Physics
Abstract

A new test stand dedicated to Superconducting Radiofrequency (SRF) cryomodule testing, CMTS1, has been commissioned and is now in operation at Fermilab. The first device to be cooled down and powered in this facility is the prototype 1.3 GHz cryomodule assembled at Fermilab for LCLS-II. We describe the demonstrated capabilities of CMTS1, report on steps taken during commissioning, provide an overview of first test results, and survey future plans., Comment: 4 pp. Proceedings of LINAC2016, East Lansing, MI, USA

Published
2018

3. Initial experimental results of a machine learning-based temperature control system for an RF gun

Author

Edelen, A. L., Biedron, S. G., Milton, S. V., Chase, B. E., Crawford, D. J., Eddy, N., Edstrom Jr., D., Harms, E. R., Ruan, J., Santucci, J. K., and Stabile, P.

Subjects
Physics - Accelerator Physics
Abstract

Colorado State University (CSU) and Fermi National Accelerator Laboratory (Fermilab) have been developing a control system to regulate the resonant frequency of an RF electron gun. As part of this effort, we present initial test results for a benchmark temperature controller that combines a machine learning-based model and a predictive control algorithm. This is part of an on-going effort to develop adaptive, machine learning-based tools specifically to address control challenges found in particle accelerator systems., Comment: 3 pp

Published
2015

4. Status and Plans for a Superconducting RF Accelerator Test Facility at Fermilab

Author

Leibfritz, J., Andrews, R., Baffes, C. M., Carlson, K., Chase, B., Church, M. D., Harms, E. R., Klebaner, A. L., Kucera, M., Martinez, A., Nagaitsev, S., Nobrega, L. E., Piot, P., Reid, J., Wendt, M., and Wesseln, S. J.

Subjects
Physics - Accelerator Physics
Abstract

The Advanced Superconducting Test Acccelerator (ASTA) is being constructed at Fermilab. The existing New Muon Lab (NML) building is being converted for this facility. The accelerator will consist of an electron gun, injector, beam acceleration section consisting of 3 TTF-type or ILC-type cryomodules, multiple downstream beamlines for testing diagnostics and conducting various beam tests, and a high power beam dump. When completed, it is envisioned that this facility will initially be capable of generating a 750-MeV electron beam with ILC beam intensity. An expansion of this facility was recently completed that will provide the capability to upgrade the accelerator to a total beam energy of 1.5-GeV. Two new buildings were also constructed adjacent to the ASTA facility to house a new cryogenic plant and multiple superconducting RF (SRF) cryomodule test stands. In addition to testing accelerator components, this facility will be used to test RF power systems, instrumentation, and control systems for future SRF accelerators such as the ILC and Project-X. This paper describes the current status and overall plans for this facility., Comment: 4 pp. 3rd International Particle Accelerator Conference (IPAC 2012) 20-25 May 2012, New Orleans, Louisiana

Published
2013

5. Preparation of the 3.9 GHz System for the European XFEL Injector Commissioning

Author

Pierini, P., Bertucci, M., Sertore, D., Albrecht, C., Baboi, N., Barbanotti, S., Branlard, J., Buettner, Th., Delfs, T., Hintz, H., Hoffmann, F., Hüning, M., Bonezzi, M., Jensch, K., Jonas, R., Klos, R., Kostin, D., Lilje, L., Maiano, C. G., Maschmann, W., Matheisen, A., Mavrič, U., Möller, W.-D., Bosotti, A., Müller, C., Prenting, J., Rothenburg, J., Sawlanski, O., Schmökel, M., Sulimov, Alexey, Vogel, E., Harms, E. R., Montiel, C. R., Chen, J. F., Pagani, Carlo, Schlossman, Mark, Butkowski, Lukasz, Chiodini, M., Michelato, P., Monaco, L., Moretti, M., and Paparella, R.

Abstract

The 3.9 GHz cryomodule and RF system for the XFEL Injector is being assembled and delivered to the underground building in summer 2015, for the injector commissioning in Fall 2015. This contribution outlines the status of the activity and reports the preparation stages of the technical commissioning of the system.

Published
2015

6. Test and Commissioning of the Third Harmonic RF System for FLASH

Author

Vogel, E., Albrecht, C., Baboi, N., Behrens, C., Delfs, T., Edwards, H., Eschke, J., Gerth, C., Harms, E. R., Hocker, A., Hoffmann, M. G., Hoffmann, M., Hüning, M., Jonas, R., Kahl, J., Kostin, D., Kreps, G., Kuhn, M., Ludwig, F., Maschmann, W., Müller, C., Nommensen, P., Rothenburg, J., Schlarb, H., Schmidt, C., and Sekutowicz, J.

Subjects
Physics::Accelerator Physics
Published
2010

7. XFEL 3.9 GHz prototype cavities tests

Author

Pierini, P., Bertucci, M., Angelo Bosotti, Maiano, C., Michelato, P., Monaco, L., Paparella, R., Sertore, D., Vogel, E., Harms, E. R., and Pagani, C.

8. Status and Plans for a Superconducting RF Accelerator Test Facility at Fermilab

Author

Leibfritz, J., Andrews, R., Baffes, C. M., Carlson, K., Chase, B., Church, M. D., Harms, E. R., Klebaner, A. L., Kucera, M., Martinez, A., Nagaitsev, S., Nobrega, L. E., philippe piot, Reid, J., Wendt, M., and Wesseln, S. J.

Subjects
Accelerator Physics (physics.acc-ph), Physics::Instrumentation and Detectors, FOS: Physical sciences, Physics::Accelerator Physics, Physics - Accelerator Physics
Abstract

The Advanced Superconducting Test Acccelerator (ASTA) is being constructed at Fermilab. The existing New Muon Lab (NML) building is being converted for this facility. The accelerator will consist of an electron gun, injector, beam acceleration section consisting of 3 TTF-type or ILC-type cryomodules, multiple downstream beamlines for testing diagnostics and conducting various beam tests, and a high power beam dump. When completed, it is envisioned that this facility will initially be capable of generating a 750-MeV electron beam with ILC beam intensity. An expansion of this facility was recently completed that will provide the capability to upgrade the accelerator to a total beam energy of 1.5-GeV. Two new buildings were also constructed adjacent to the ASTA facility to house a new cryogenic plant and multiple superconducting RF (SRF) cryomodule test stands. In addition to testing accelerator components, this facility will be used to test RF power systems, instrumentation, and control systems for future SRF accelerators such as the ILC and Project-X. This paper describes the current status and overall plans for this facility., 4 pp. 3rd International Particle Accelerator Conference (IPAC 2012) 20-25 May 2012, New Orleans, Louisiana

9. Mucositis reduction by selective elimination of oral flora in irradiated cancers of the head and neck: a placebo-controlled double-blind randomized study.

Author

Wijers OB, Levendag PC, Harms ER, Gan-Teng AM, Schmitz PI, Hendriks WD, Wilims EB, van der Est H, and Visch LL

Subjects
Adult, Aged, Amphotericin B therapeutic use, Colistin therapeutic use, Double-Blind Method, Female, Gram-Negative Bacteria drug effects, Humans, Male, Middle Aged, Mouth Mucosa drug effects, Mouth Mucosa radiation effects, Placebos, Radiation Injuries etiology, Radiation Injuries microbiology, Salivary Glands radiation effects, Stomatitis etiology, Tobramycin therapeutic use, Drug Therapy, Combination therapeutic use, Head and Neck Neoplasms radiotherapy, Mouth Mucosa microbiology, Radiation Injuries prevention & control, Stomatitis microbiology, Stomatitis prevention & control
Abstract

Purpose: The aim of the study was to test the hypothesis that aerobic Gram-negative bacteria (AGNB) play a crucial role in the pathogenesis of radiation-induced mucositis; consequently, selective elimination of these bacteria from the oral flora should result in a reduction of the mucositis., Methods and Materials: Head-and-neck cancer patients, when scheduled for treatment by external beam radiation therapy (EBRT), were randomized for prophylactic treatment with an oral paste containing either a placebo or a combination of the antibiotics polymyxin E, tobramycin, and amphotericin B (PTA group). Weekly, the objective and subjective mucositis scores and microbiologic counts of the oral flora were noted. The primary study endpoint was the mucositis grade after 3 weeks of EBRT., Results: Seventy-seven patients were evaluable. No statistically significant difference for the objective and subjective mucositis scores was observed between the two study arms (p = 0.33). The percentage of patients with positive cultures of AGNB was significantly reduced in the PTA group (p = 0.01). However, complete eradication of AGNB was not achieved., Conclusions: Selective elimination of AGNB of the oral flora did not result in a reduction of radiation-induced mucositis and therefore does not support the hypothesis that these bacteria play a crucial role in the pathogenesis of mucositis.

Published
2001
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