IBIC2013 - List of Keywords (shielding)

Paper	Title	Other Keywords	Page
MOCL2	Design of a Novel Cherenkov Detector System for Machine Induced Background Monitoring in the CMS Cavern	background, LHC, simulation, radiation	33
	S. Orfanelli, A.E. Dabrowski, M. Giunta CERN, Geneva, Switzerland M.J. Ambrose, A. Finkel, R. Rusack University of Minnesota, Minneapolis, Minnesota, USA D.P. Stickland PU, Princeton, New Jersey, USA
	A novel detector system has been designed for an efficient online measurement of the machine induced background in the CMS experimental cavern. The suppression of the CMS cavern background originating from pp collision products and the 25 ns bunch spacing have set the requirements for the detector design. Each detector unit will be a radiation hard, cylindrical Cherenkov radiator optically coupled to an ultra-fast UV-sensitive photomultiplier tube, providing a prompt, directionally sensitive measurement. Simulation and test beam measurements have shown the achievability of the goals that have driven the baseline design. The system will consist of 20 azimuthally distributed detectors per end, installed at a radius of r ~ 180 cm and a distance 20.6 m away from the CMS interaction region. The detector units will enable a measurement of the transverse distribution of the bunch-by-bunch machine induced background flux. This will provide important feedback from the CMS on the beam conditions during the LHC machine setup and comparisons to expectations based on FLUKA simulations.
	Slides MOCL2 [14.094 MB]

MOPC32	Development Status of Optical Synchronization for the European XFEL	XFEL, laser, DESY, coupling	135
	C. Sydlo, M.K. Czwalinna, M. Felber, C. Gerth, T. Lamb, H. Schlarb, S. Schulz, F. Zummack DESY, Hamburg, Germany S. Jabłoński Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
	Precise timing synchronization on the femtosecond timescale is crucial for time resolved experiments at modern free-electron lasers (FELs) like FLASH and the upcoming European XFEL. The required precision can only be achieved by a laser-based synchronization system. The pulsed laser-based scheme at FLASH, based on the distribution of femtosecond laser pulses over actively stabilized optical fibers, has evolved over the years from a prototype setup to a mature and reliable system. At the same time, the present implementation serves as prototype for the synchronization infrastructure at the European XFEL. Due to a factor of ten increase of the length of the accelerator and an increased number of timing-critical subsystems, new challenges arise. This paper reports on the current development progress of the XFEL optical synchronization, discusses major complications and their solutions.

MOPF05	Operating Semiconductor Timepix Detector with Optical Readout in an Extremely Hostile Environment of Laser Plasma Acceleration Experiment	laser, vacuum, target, optics	208
	L. Pribyl Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic
	The laser plasma acceleration (LPA) experiments produce very intensive electromagnetic pulses (EMP) complicating operation of sensitive electronic detectors. We present our experience with new optical readout and EMP shielding for hybrid silicon pixel detector Timepix, which enabled its operation in an extremely hostile electromagnetic LPA environment. The Timepix detector provides a matrix of 256x256 spectroscopic channels with 55 μm pitch. An optical readout, battery powering and shielding against electromagnetic pulses (EMP) have been developed as part of the ELI Beamlines/IEAP project for the detector Timepix and it significantly improved its resistance to EMP with respect to previous setup using metallic cables for both data acquisition and powering. The new optical setup was successfully tested under vacuum at Prague Asterix Laser System (PALS) during experiments with laser pulses of energies up to 700 J and duration of 350 ps bombarding thin foil solid target. Electromagnetic field was measured both outside the vacuum chamber and inside. The recorded spectrometric data were analyzed and interpreted in a context of an independent experimental campaign run in parallel. X. Llopart et al.: Timepix, a 65k Programmable Pixel Readout Chip for Arrival Time, Energy and/or Photon Counting Measurements, Nucl. Instr. and Meth. in Phys. Res. A. Vol. 581 (2007), p485

MOPF25	Cryogenic Current Comparator as Low Intensity Beam Current Monitor in the CERN Antiproton Decelerators	antiproton, CERN, longitudinal, cryogenics	267
	M.F. Fernandes, J. Tan CERN, Geneva, Switzerland M.F. Fernandes, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom M.F. Fernandes, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: Work supported by the EU within the oPAC project under contract 289485. In the low-energy Antiproton Decelerator (AD) and the future Extra Low ENergy Antiproton (ELENA) rings at CERN, an absolute measurement of the beam intensity is essential to monitor any losses during the deceleration and cooling phases. However, existing DC current transformers can hardly reach the μA level, while at the AD and ELENA currents can be as low as 100 nA. A Cryogenic Current Comparator (CCC) based on a superconducting quantum interference device (SQUID) is currently being designed and shall be installed in the AD and ELENA machines. It should meet the following specifications: A current resolution smaller than 10 nA, a dynamic range covering currents between 100 nA and 1 mA, as well as a bandwidth from DC to 1 kHz. Different design options are being considered, including the use of low or high temperature superconductor materials, different CCC shapes and dimensions, different SQUID characteristics, as well as electromagnetic shielding requirements. In this contribution we present first results from a comparative analysis of different monitor options, taking into consideration the external electromagnetic sources at the foreseen device locations.
	Poster MOPF25 [1.059 MB]

TUPF32	A Cryogenic Current Comparator for FAIR with Improved Resolution	pick-up, cryogenics, DESY, longitudinal	590
	R. Geithner, W. Vodel HIJ, Jena, Germany R. Geithner, R. Neubert, P. Seidel FSU Jena, Jena, Germany F. Kurian, H. Reeg, M. Schwickert GSI, Darmstadt, Germany
	A Cryogenic Current Comparator is a highly sensitive tool for the non-destructive online monitoring of continuous as well as bunched beams of very low intensities. The noise-limited current resolution of such a device depends on the ferromagnetic material embedded in the pickup coil of the CCC. Therefore, the main focus of research was on the low temperature properties of ferromagnetic core materials. In this contribution we present first results of the completed Cryogenic Current Comparator for FAIR working in a laboratory environment, regarding the improvements in resolution due to the use of suitable ferromagnetic core materials.
	Poster TUPF32 [3.868 MB]

WEPF35	Current Status of the Schottky Cavity Sensor for the CR at FAIR	coupling, dipole, vacuum, simulation	907
	M. Hansli, R. Jakoby, A. Penirschke TU Darmstadt, Darmstadt, Germany P. Hülsmann, W. Kaufmann GSI, Darmstadt, Germany
	Funding: This work was supported by the GSI. The author would like to thank the CST AG for providing CST Studio Suite. In this paper the current status of the Schottky Cavity Sensor development for the Collector Ring at FAIR, a dedicated storage ring for secondary particles, rare isotopes, and antiprotons, is presented. Designed for longitudinal and transversal Schottky signals, the Sensor features a pillbox cavity with attached waveguide filters utilizing the Monopole mode at 200 MHz for longitudinal and the Dipole mode at around 330 MHz for transversal Schottky measurements. Separated coupling structures allow for mode-selective coupling to measure the different Schottky planes independently. A ceramic vacuum shielding inside the pillbox is implemented to enable non-hermetic adjustable coupling, tuning devices and waveguide structures. Simulations of the structure with focus on the impact of the coupling structures and the ceramic vacuum shielding on the R-over-Q values and the coupling are presented as well as measurements of a scaled demonstrator including comparisons with the simulations.

Paper

Title

Other Keywords

Page

MOCL2

Design of a Novel Cherenkov Detector System for Machine Induced Background Monitoring in the CMS Cavern

background, LHC, simulation, radiation

33

S. Orfanelli, A.E. Dabrowski, M. Giunta
CERN, Geneva, Switzerland
M.J. Ambrose, A. Finkel, R. Rusack
University of Minnesota, Minneapolis, Minnesota, USA
D.P. Stickland
PU, Princeton, New Jersey, USA

A novel detector system has been designed for an efficient online measurement of the machine induced background in the CMS experimental cavern. The suppression of the CMS cavern background originating from pp collision products and the 25 ns bunch spacing have set the requirements for the detector design. Each detector unit will be a radiation hard, cylindrical Cherenkov radiator optically coupled to an ultra-fast UV-sensitive photomultiplier tube, providing a prompt, directionally sensitive measurement. Simulation and test beam measurements have shown the achievability of the goals that have driven the baseline design. The system will consist of 20 azimuthally distributed detectors per end, installed at a radius of r ~ 180 cm and a distance 20.6 m away from the CMS interaction region. The detector units will enable a measurement of the transverse distribution of the bunch-by-bunch machine induced background flux. This will provide important feedback from the CMS on the beam conditions during the LHC machine setup and comparisons to expectations based on FLUKA simulations.

Slides MOCL2 [14.094 MB]

MOPC32

Development Status of Optical Synchronization for the European XFEL

XFEL, laser, DESY, coupling

135

C. Sydlo, M.K. Czwalinna, M. Felber, C. Gerth, T. Lamb, H. Schlarb, S. Schulz, F. Zummack
DESY, Hamburg, Germany
S. Jabłoński
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland

Precise timing synchronization on the femtosecond timescale is crucial for time resolved experiments at modern free-electron lasers (FELs) like FLASH and the upcoming European XFEL. The required precision can only be achieved by a laser-based synchronization system. The pulsed laser-based scheme at FLASH, based on the distribution of femtosecond laser pulses over actively stabilized optical fibers, has evolved over the years from a prototype setup to a mature and reliable system. At the same time, the present implementation serves as prototype for the synchronization infrastructure at the European XFEL. Due to a factor of ten increase of the length of the accelerator and an increased number of timing-critical subsystems, new challenges arise. This paper reports on the current development progress of the XFEL optical synchronization, discusses major complications and their solutions.

MOPF05

Operating Semiconductor Timepix Detector with Optical Readout in an Extremely Hostile Environment of Laser Plasma Acceleration Experiment

laser, vacuum, target, optics

208

L. Pribyl
Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic

The laser plasma acceleration (LPA) experiments produce very intensive electromagnetic pulses (EMP) complicating operation of sensitive electronic detectors. We present our experience with new optical readout and EMP shielding for hybrid silicon pixel detector Timepix*, which enabled its operation in an extremely hostile electromagnetic LPA environment. The Timepix detector provides a matrix of 256x256 spectroscopic channels with 55 μm pitch. An optical readout, battery powering and shielding against electromagnetic pulses (EMP) have been developed as part of the ELI Beamlines/IEAP project for the detector Timepix and it significantly improved its resistance to EMP with respect to previous setup using metallic cables for both data acquisition and powering. The new optical setup was successfully tested under vacuum at Prague Asterix Laser System (PALS) during experiments with laser pulses of energies up to 700 J and duration of 350 ps bombarding thin foil solid target. Electromagnetic field was measured both outside the vacuum chamber and inside. The recorded spectrometric data were analyzed and interpreted in a context of an independent experimental campaign run in parallel.
* X. Llopart et al.: Timepix, a 65k Programmable Pixel Readout Chip for Arrival Time, Energy and/or Photon Counting Measurements, Nucl. Instr. and Meth. in Phys. Res. A. Vol. 581 (2007), p485

MOPF25

Cryogenic Current Comparator as Low Intensity Beam Current Monitor in the CERN Antiproton Decelerators

antiproton, CERN, longitudinal, cryogenics

267

M.F. Fernandes, J. Tan
CERN, Geneva, Switzerland
M.F. Fernandes, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
M.F. Fernandes, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: Work supported by the EU within the oPAC project under contract 289485.
In the low-energy Antiproton Decelerator (AD) and the future Extra Low ENergy Antiproton (ELENA) rings at CERN, an absolute measurement of the beam intensity is essential to monitor any losses during the deceleration and cooling phases. However, existing DC current transformers can hardly reach the μA level, while at the AD and ELENA currents can be as low as 100 nA. A Cryogenic Current Comparator (CCC) based on a superconducting quantum interference device (SQUID) is currently being designed and shall be installed in the AD and ELENA machines. It should meet the following specifications: A current resolution smaller than 10 nA, a dynamic range covering currents between 100 nA and 1 mA, as well as a bandwidth from DC to 1 kHz. Different design options are being considered, including the use of low or high temperature superconductor materials, different CCC shapes and dimensions, different SQUID characteristics, as well as electromagnetic shielding requirements. In this contribution we present first results from a comparative analysis of different monitor options, taking into consideration the external electromagnetic sources at the foreseen device locations.

Poster MOPF25 [1.059 MB]

TUPF32

A Cryogenic Current Comparator for FAIR with Improved Resolution

pick-up, cryogenics, DESY, longitudinal

590

R. Geithner, W. Vodel
HIJ, Jena, Germany
R. Geithner, R. Neubert, P. Seidel
FSU Jena, Jena, Germany
F. Kurian, H. Reeg, M. Schwickert
GSI, Darmstadt, Germany

A Cryogenic Current Comparator is a highly sensitive tool for the non-destructive online monitoring of continuous as well as bunched beams of very low intensities. The noise-limited current resolution of such a device depends on the ferromagnetic material embedded in the pickup coil of the CCC. Therefore, the main focus of research was on the low temperature properties of ferromagnetic core materials. In this contribution we present first results of the completed Cryogenic Current Comparator for FAIR working in a laboratory environment, regarding the improvements in resolution due to the use of suitable ferromagnetic core materials.

Poster TUPF32 [3.868 MB]

WEPF35

Current Status of the Schottky Cavity Sensor for the CR at FAIR

coupling, dipole, vacuum, simulation

907

M. Hansli, R. Jakoby, A. Penirschke
TU Darmstadt, Darmstadt, Germany
P. Hülsmann, W. Kaufmann
GSI, Darmstadt, Germany

Funding: This work was supported by the GSI. The author would like to thank the CST AG for providing CST Studio Suite.
In this paper the current status of the Schottky Cavity Sensor development for the Collector Ring at FAIR, a dedicated storage ring for secondary particles, rare isotopes, and antiprotons, is presented. Designed for longitudinal and transversal Schottky signals, the Sensor features a pillbox cavity with attached waveguide filters utilizing the Monopole mode at 200 MHz for longitudinal and the Dipole mode at around 330 MHz for transversal Schottky measurements. Separated coupling structures allow for mode-selective coupling to measure the different Schottky planes independently. A ceramic vacuum shielding inside the pillbox is implemented to enable non-hermetic adjustable coupling, tuning devices and waveguide structures. Simulations of the structure with focus on the impact of the coupling structures and the ceramic vacuum shielding on the R-over-Q values and the coupling are presented as well as measurements of a scaled demonstrator including comparisons with the simulations.