SRF2011 - List of Authors (Kushnick, P.)

Paper	Title	Page
MOPO070	Preliminary Test Results from 650 MHz Single Cell Medium Beta Cavities for Project X	271
	P. Kneisel, A. Burrill, P. Kushnick, F. Marhauser, R.A. Rimmer JLAB, Newport News, Virginia, USA
	Funding: This manuscript has been authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. We have fabricated two single cell 650 MHz cavities of a JLab design [1], for possible project X application. Both cavities were manufactured at Jlab from RRR>250 niobium sheet of 4 mm thickness using standard techniques such as deep drawing, EBW, BCP , hydrogen degassing heat treatment, high pressure ultrapure water rinsing and clean room assembly. A detailed description of the design and fabrication procedures is forthcoming [2]. Initially cavity #1 was – after final surface treatment by bcp – measured without any provisions for stiffening . As expected, the pressure sensitivity and the Lorentz Force detuning coefficients were quite high; however, the RF performance was very encouraging: the cavity exhibited a Q-value > 10¹¹ at 1.6K, corresponding to a residual resistance of < 1.5 nOhm The initial gradient was limited to Eacc ~ 18 MV/m, limited by field emission. In a subsequent test, we are re-rinsing the cavity and are making provisions for stiffening up the cavity. By the time of this writing, this test is in progress; the results will be reported at this conference as well as results from the second cavity. [1] F. Marhauser, JLab-TN-10-043 [2] F. Marhauser et al; IPAC 2011 to be published

TUPO028	Qualification of the Second Batch Production 9-Cell Cavities Manufactured by AES and Validation of the First US Industrial Cavity Vendor for ILC	433
	R.L. Geng, D. Forehand, B.A. Golden, P. Kushnick, R.B. Overton JLAB, Newport News, Virginia, USA M. Calderaro, E. Peterson, J. Rathke AES, Medford, NY, USA M.S. Champion, J. Follkie Fermilab, Batavia, USA A.C. Crawford CLASSE, Ithaca, New York, USA
	Funding: This work was authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 One of the major goals of ILC SRF cavity R&D is to develop industrial capabilities of cavity manufacture and processing in all three regions. In the past several years, Jefferson Lab, in collaboration with Fermi National Accelerator Laboratory, has processed and tested all the 9-cell cavities of the first batch (4 cavities) and second batch (6 cavities) production cavities manufactured by Advanced Energy Systems Inc. (AES). Over the course, close information feedback was maintained, resulting in changes in fabrication and processing procedures. A light buffered chemical polishing was introduced, removing the weld splatters that could not be effectively removed by heavy EP alone. An 800 Celsius 2 hour vacuum furnace heat treatment procedure replaced the original 600 Celsius 10 hour procedure. Four out of the six 9-cell cavities of the second production bath achieved a gradient of 36-41 MV/m at a Q0 of more than 8·10⁹ at 35 MV/m. This result validated AES as the first “ILC certified” industrial vendor in the US for ILC cavity manufacture.

Paper

Title

Page

Preliminary Test Results from 650 MHz Single Cell Medium Beta Cavities for Project X

271

P. Kneisel, A. Burrill, P. Kushnick, F. Marhauser, R.A. Rimmer
JLAB, Newport News, Virginia, USA

Funding: This manuscript has been authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
We have fabricated two single cell 650 MHz cavities of a JLab design [1], for possible project X application. Both cavities were manufactured at Jlab from RRR>250 niobium sheet of 4 mm thickness using standard techniques such as deep drawing, EBW, BCP , hydrogen degassing heat treatment, high pressure ultrapure water rinsing and clean room assembly. A detailed description of the design and fabrication procedures is forthcoming [2]. Initially cavity #1 was – after final surface treatment by bcp – measured without any provisions for stiffening . As expected, the pressure sensitivity and the Lorentz Force detuning coefficients were quite high; however, the RF performance was very encouraging: the cavity exhibited a Q-value > 10¹¹ at 1.6K, corresponding to a residual resistance of < 1.5 nOhm The initial gradient was limited to Eacc ~ 18 MV/m, limited by field emission. In a subsequent test, we are re-rinsing the cavity and are making provisions for stiffening up the cavity. By the time of this writing, this test is in progress; the results will be reported at this conference as well as results from the second cavity.
[1] F. Marhauser, JLab-TN-10-043
[2] F. Marhauser et al; IPAC 2011 to be published

TUPO028

Qualification of the Second Batch Production 9-Cell Cavities Manufactured by AES and Validation of the First US Industrial Cavity Vendor for ILC

433

R.L. Geng, D. Forehand, B.A. Golden, P. Kushnick, R.B. Overton
JLAB, Newport News, Virginia, USA
M. Calderaro, E. Peterson, J. Rathke
AES, Medford, NY, USA
M.S. Champion, J. Follkie
Fermilab, Batavia, USA
A.C. Crawford
CLASSE, Ithaca, New York, USA

Funding: This work was authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
One of the major goals of ILC SRF cavity R&D is to develop industrial capabilities of cavity manufacture and processing in all three regions. In the past several years, Jefferson Lab, in collaboration with Fermi National Accelerator Laboratory, has processed and tested all the 9-cell cavities of the first batch (4 cavities) and second batch (6 cavities) production cavities manufactured by Advanced Energy Systems Inc. (AES). Over the course, close information feedback was maintained, resulting in changes in fabrication and processing procedures. A light buffered chemical polishing was introduced, removing the weld splatters that could not be effectively removed by heavy EP alone. An 800 Celsius 2 hour vacuum furnace heat treatment procedure replaced the original 600 Celsius 10 hour procedure. Four out of the six 9-cell cavities of the second production bath achieved a gradient of 36-41 MV/m at a Q0 of more than 8·10⁹ at 35 MV/m. This result validated AES as the first “ILC certified” industrial vendor in the US for ILC cavity manufacture.