The DESY II Test Beam Facility will resume operations mid February 2018. The current status and p... more The DESY II Test Beam Facility will resume operations mid February 2018. The current status and possibilities for future improvements and extensions of the facility will be presented.
This document is motivated by the need of clarification of possible interference between the oper... more This document is motivated by the need of clarification of possible interference between the operation of PETRA III and the DESY test beam. The document is intended to describe shortly the DESY test beam performance and the expected conditions after the start-up of PETRA III. We evaluate the possible impact of PE-TRA III on the availability, the intensity, and the energy of the electrons/positrons provided to the test beam lines at DESY II. In the interest of a very large com-munity of test beam users we intend to identify, and eventually resolve, possible conflicts between the two main programs of the DESY II machine, namely the filling of PETRA III and DORIS and the beam delivery to test beam facilities.
This document is motivated by the need of clarification of possible interference between the oper... more This document is motivated by the need of clarification of possible interference between the operation of PETRA III and the DESY test beam. The document is intended to describe shortly the DESY test beam performance and the expected conditions after the start-up of PETRA III. We evaluate the possible impact of PETRA III on the availability, the intensity, and the energy of the electrons/positrons provided to the test beam lines at DESY II. In the interest of a very large community of test beam users we intend to identify, and eventually resolve, possible conflicts between the two main programs of the DESY II machine, namely the filling of PETRA III and DORIS and the beam delivery to test beam facilities. ∗DESY, Hamburg, Germany
This document is motivated by the need of clarification of possible interference between the oper... more This document is motivated by the need of clarification of possible interference between the operation of PETRA III and the DESY test beam. The document is intended to describe shortly the DESY test beam performance and the expected conditions after the start-up of PETRA III. We evaluate the possible impact of PETRA III on the availability, the intensity, and the energy of the electrons/positrons provided to the test beam lines at DESY II. In the interest of a very large community of test beam users we intend to identify, and eventually resolve, possible conflicts between the two main programs of the DESY II machine, namely the filling of PETRA III and DORIS and the beam delivery to test beam facilities.
On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in ... more On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in Hamburg. Fifty participants from different user communities, ranging from LHC (ALICE, ATLAS, CMS, LHCb) to FAIR (CBM, PANDA), DUNE, Belle-II, future linear colliders (ILC, CLIC) and generic detector R&D presented their experiences with the DESY II Test Beam Facility, their concrete plans for the upcoming years and a first estimate of their needs for beam time in the long-term future beyond 2025. A special focus was also on additional improvements to the facility beyond its current capabilities.
On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in ... more On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in Hamburg. Fifty participants from different user communities, ranging from LHC (ALICE, ATLAS, CMS, LHCb) to FAIR (CBM, PANDA), DUNE, Belle-II, future linear colliders (ILC, CLIC) and generic detector R&D presented their experiences with the DESY II Test Beam Facility, their concrete plans for the upcoming years and a first estimate of their needs for beam time in the long-term future beyond 2025. A special focus was also on additional improvements to the facility beyond its current capabilities.
Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, de... more Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, describes the detectors which will record and measure the charged and neutral particles produced in the ILC's high energy e+ e-collisions. The physics of the ILC, and the environment of the machine-detector interface, pose new challenges for detector design. Several conceptual designs for the detector promise the needed performance, and ongoing detector R&D is addressing the outstanding technological issues. Two such detectors, ...
The transverse polarization at HERA has been measured so far with a statistical error of 2% to 4%... more The transverse polarization at HERA has been measured so far with a statistical error of 2% to 4% and a systematic error of approximately 5%. An additional polarimeter to measure the longitudinal beam polarization near the HERMES detector is currently being commissioned. After careful calibration it will provide an independent measurement of the polarization which is expected to increase the reliability of the data and reduce the overall systematic uncertainty. First results will be presented.
Exclusive coherent and incoherent electroproduction of the rho(0) meson from H-1 and N-14 targets... more Exclusive coherent and incoherent electroproduction of the rho(0) meson from H-1 and N-14 targets has been studied at the HERMES experiment as a function of coherence length (l(c)), corresponding to the lifetime of hadronic fluctuations of the virtual photon, and squared four-momentum of the virtual photon (-Q(2)). The ratio of N-14 to H-1 cross sections per nucleon, called nuclear transparency, was found to increase (decrease) with increasing l(c) for coherent (incoherent) rho(0) electroproduction. For fixed l(c), a rise of nuclear transparency with Q(2) is observed for both coherent and incoherent rho(0) production, which is in agreement with theoretical calculations of color transparency.
In 1996 HERA is expected to deliver polarized positron beam routinely for the HERMES experiment. ... more In 1996 HERA is expected to deliver polarized positron beam routinely for the HERMES experiment. The transverse beam polarization is measured with a Compton polarimeter. A pair of spin rotators provides longitudinal spin polarization at the experiment. In 1995, the value of the polarization during HERMES data taking varied between 45% and 70%, with typical values near 53%. The beam
The DESY II Test Beam Facility will resume operations mid February 2018. The current status and p... more The DESY II Test Beam Facility will resume operations mid February 2018. The current status and possibilities for future improvements and extensions of the facility will be presented.
This document is motivated by the need of clarification of possible interference between the oper... more This document is motivated by the need of clarification of possible interference between the operation of PETRA III and the DESY test beam. The document is intended to describe shortly the DESY test beam performance and the expected conditions after the start-up of PETRA III. We evaluate the possible impact of PE-TRA III on the availability, the intensity, and the energy of the electrons/positrons provided to the test beam lines at DESY II. In the interest of a very large com-munity of test beam users we intend to identify, and eventually resolve, possible conflicts between the two main programs of the DESY II machine, namely the filling of PETRA III and DORIS and the beam delivery to test beam facilities.
This document is motivated by the need of clarification of possible interference between the oper... more This document is motivated by the need of clarification of possible interference between the operation of PETRA III and the DESY test beam. The document is intended to describe shortly the DESY test beam performance and the expected conditions after the start-up of PETRA III. We evaluate the possible impact of PETRA III on the availability, the intensity, and the energy of the electrons/positrons provided to the test beam lines at DESY II. In the interest of a very large community of test beam users we intend to identify, and eventually resolve, possible conflicts between the two main programs of the DESY II machine, namely the filling of PETRA III and DORIS and the beam delivery to test beam facilities. ∗DESY, Hamburg, Germany
This document is motivated by the need of clarification of possible interference between the oper... more This document is motivated by the need of clarification of possible interference between the operation of PETRA III and the DESY test beam. The document is intended to describe shortly the DESY test beam performance and the expected conditions after the start-up of PETRA III. We evaluate the possible impact of PETRA III on the availability, the intensity, and the energy of the electrons/positrons provided to the test beam lines at DESY II. In the interest of a very large community of test beam users we intend to identify, and eventually resolve, possible conflicts between the two main programs of the DESY II machine, namely the filling of PETRA III and DORIS and the beam delivery to test beam facilities.
On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in ... more On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in Hamburg. Fifty participants from different user communities, ranging from LHC (ALICE, ATLAS, CMS, LHCb) to FAIR (CBM, PANDA), DUNE, Belle-II, future linear colliders (ILC, CLIC) and generic detector R&D presented their experiences with the DESY II Test Beam Facility, their concrete plans for the upcoming years and a first estimate of their needs for beam time in the long-term future beyond 2025. A special focus was also on additional improvements to the facility beyond its current capabilities.
On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in ... more On October 5/6, 2017, DESY hosted the first DESY Test Beam User Workshop [1] which took place in Hamburg. Fifty participants from different user communities, ranging from LHC (ALICE, ATLAS, CMS, LHCb) to FAIR (CBM, PANDA), DUNE, Belle-II, future linear colliders (ILC, CLIC) and generic detector R&D presented their experiences with the DESY II Test Beam Facility, their concrete plans for the upcoming years and a first estimate of their needs for beam time in the long-term future beyond 2025. A special focus was also on additional improvements to the facility beyond its current capabilities.
Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, de... more Abstract: This report, Volume IV of the International Linear Collider Reference Design Report, describes the detectors which will record and measure the charged and neutral particles produced in the ILC's high energy e+ e-collisions. The physics of the ILC, and the environment of the machine-detector interface, pose new challenges for detector design. Several conceptual designs for the detector promise the needed performance, and ongoing detector R&D is addressing the outstanding technological issues. Two such detectors, ...
The transverse polarization at HERA has been measured so far with a statistical error of 2% to 4%... more The transverse polarization at HERA has been measured so far with a statistical error of 2% to 4% and a systematic error of approximately 5%. An additional polarimeter to measure the longitudinal beam polarization near the HERMES detector is currently being commissioned. After careful calibration it will provide an independent measurement of the polarization which is expected to increase the reliability of the data and reduce the overall systematic uncertainty. First results will be presented.
Exclusive coherent and incoherent electroproduction of the rho(0) meson from H-1 and N-14 targets... more Exclusive coherent and incoherent electroproduction of the rho(0) meson from H-1 and N-14 targets has been studied at the HERMES experiment as a function of coherence length (l(c)), corresponding to the lifetime of hadronic fluctuations of the virtual photon, and squared four-momentum of the virtual photon (-Q(2)). The ratio of N-14 to H-1 cross sections per nucleon, called nuclear transparency, was found to increase (decrease) with increasing l(c) for coherent (incoherent) rho(0) electroproduction. For fixed l(c), a rise of nuclear transparency with Q(2) is observed for both coherent and incoherent rho(0) production, which is in agreement with theoretical calculations of color transparency.
In 1996 HERA is expected to deliver polarized positron beam routinely for the HERMES experiment. ... more In 1996 HERA is expected to deliver polarized positron beam routinely for the HERMES experiment. The transverse beam polarization is measured with a Compton polarimeter. A pair of spin rotators provides longitudinal spin polarization at the experiment. In 1995, the value of the polarization during HERMES data taking varied between 45% and 70%, with typical values near 53%. The beam
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