PAC2013 - List of Authors (Myers, M.)

Paper	Title	Page
THPHO07	Novel Mechanical Design for RHIC Transverse Stochastic Cooling Kicker	1313
	C.J. Liaw, S. Bellavia, J.M. Brennan, K. Mernick, M. Myers, J.E. Tuozzolo BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Based on the beam emittance measurement from the pickup, the RHIC Stochastic Cooling kicker uses sixteen narrowband high Q cavities (from 5 to 8 GHz) to kick (or to cool) the bunched beam on each of the two transverse planes in the two rings. The cavities are integrated to two pairs of cavity plates and installed in two UHV chambers. The new kicker features scissor like driving mechanism, frictionless flexure joints, water cooled cavity plates, small frequency shift (less than 0.05%) during the operation and maintenance free. Novel mechanical designs, including cavity plate, vacuum, cooling, driving mechanism, and support structure design, are presented. Structural and thermal analyses, using ANSYS, were performed to confirm chamber structural stability and to calculate the cavity plate deformation due to thermal and mechanical load. Good agreement between the calculated cavity plate deflection and the expected plate deformation from the cavity frequency shift measurements has been achieved. Three assemblies utilizing this design (1 for the vertical and 2 for the horizontal plane) were completed for the FY2012 run. Successful performance has been reported.

THPHO08	Robust Mechanical Design for RHIC Transverse Stochastic Cooling Pickup	1316
	C.J. Liaw, J.M. Brennan, V. De Monte, K. Mernick, M. Myers, J.E. Tuozzolo BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The RHIC transverse Stochastic Cooling Pickup uses a pair of high resolution 4-8 GHz frequency band planar loop arrays to measure the Schottky signals from the bunched beams in the two transverse planes of the two rings. Precision alignment between the two 381 mm long array boards was achieved by surveying two specially designed target fixtures outside the vacuum chamber and using a pair of high resolution, motor controlled, and force balanced actuators. Robust mechanical design was achieved by excluding wearable mechanical joints and fragile electronics inside the vacuum chamber. Both mechanical designs and structural analysis results, for the vacuum chamber and for the array board supports, are presented. Two horizontal and two vertical plane pickups have been fabricated and installed in RHIC for the FY2012 run. Successful performance has been reported.

Paper

Title

Page

Novel Mechanical Design for RHIC Transverse Stochastic Cooling Kicker

1313

C.J. Liaw, S. Bellavia, J.M. Brennan, K. Mernick, M. Myers, J.E. Tuozzolo
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Based on the beam emittance measurement from the pickup, the RHIC Stochastic Cooling kicker uses sixteen narrowband high Q cavities (from 5 to 8 GHz) to kick (or to cool) the bunched beam on each of the two transverse planes in the two rings. The cavities are integrated to two pairs of cavity plates and installed in two UHV chambers. The new kicker features scissor like driving mechanism, frictionless flexure joints, water cooled cavity plates, small frequency shift (less than 0.05%) during the operation and maintenance free. Novel mechanical designs, including cavity plate, vacuum, cooling, driving mechanism, and support structure design, are presented. Structural and thermal analyses, using ANSYS, were performed to confirm chamber structural stability and to calculate the cavity plate deformation due to thermal and mechanical load. Good agreement between the calculated cavity plate deflection and the expected plate deformation from the cavity frequency shift measurements has been achieved. Three assemblies utilizing this design (1 for the vertical and 2 for the horizontal plane) were completed for the FY2012 run. Successful performance has been reported.

THPHO08

Robust Mechanical Design for RHIC Transverse Stochastic Cooling Pickup

1316

C.J. Liaw, J.M. Brennan, V. De Monte, K. Mernick, M. Myers, J.E. Tuozzolo
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The RHIC transverse Stochastic Cooling Pickup uses a pair of high resolution 4-8 GHz frequency band planar loop arrays to measure the Schottky signals from the bunched beams in the two transverse planes of the two rings. Precision alignment between the two 381 mm long array boards was achieved by surveying two specially designed target fixtures outside the vacuum chamber and using a pair of high resolution, motor controlled, and force balanced actuators. Robust mechanical design was achieved by excluding wearable mechanical joints and fragile electronics inside the vacuum chamber. Both mechanical designs and structural analysis results, for the vacuum chamber and for the array board supports, are presented. Two horizontal and two vertical plane pickups have been fabricated and installed in RHIC for the FY2012 run. Successful performance has been reported.