Low-Energy Demonstration Accelerator (Leda) Radio-Frequency Quadrupole (Rfq) Results

Young, L.M.; Bolme, G.O.; Gilpatrick, J.D.; Johnson, K.F.; Lysenko, W. P.; McGehee, P.; Nath, S.; Rees, D.; Regan, A.; Rybarcyk, L.; Schneider, J.D.; Schulze, Martin; Sherman, J.D.; Schrage, D.; Smith, H. Vernon

doi:10.1142/9789812792181_0033

Cited by 2 publications

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“…With output energy of 6.7 MeV the LEDA RFQ [1,8] is the highest energy and highest power RFQ in the world [3,5,[9][10][11]. The beam power is 670 kW when operated with the design-value 100-mA CW proton beam, making it the second-most powerful operating linear accelerator (after the LANSCE 800-MeV linac).…”

Section: Design Featuresmentioning

confidence: 99%

“…The RFQ [1][2][3][4][5] receives a continuous stream of 75-keV protons from the H + injector, [6,7] forms it into bunches with a high capture efficiency (~ 94%), and then accelerates these bunches to an energy of 6.7 MeV. The RFQ consists of an 8-m-long cylindrical resonant cavity excited in the TE21 mode, inside which four scalloped vanes are mounted in an orthogonal array about the axis.…”

Section: Rfq Descriptionmentioning

confidence: 99%

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Operations of the LEDA resonantly coupled RFQ

Young

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The LEDA RFQ is a 350-MHz continuous-wave (CW) radio-frequency quadrupole linac. LEDA is the low energy demonstration accelerator, a full power front-end prototype for the accelerator production of tritium (APT) linac. This machine has accelerated a 100-mA CW proton beam from 75 keV to 6.7 MeV. The 8-m-long RFQ accepts a dc, 75-keV, ~110-mA H + beam from the LEDA injector, bunches the beam, and accelerates it to full energy with ~94% transmission. Output beam power is 670 kW. This RFQ consists of four 2-meter-long RFQs joined with resonant coupling to form an 8-meter-long RFQ. The resonant coupling improves the stability of both the longitudinal and transverse RF-field distribution in this long RFQ. RFQ DESCRIPTIONThe RFQ [1-5] receives a continuous stream of 75-keV protons from the H + injector, [6,7] forms it into bunches with a high capture efficiency (~ 94%), and then accelerates these bunches to an energy of 6.7 MeV. The RFQ consists of an 8-m-long cylindrical resonant cavity excited in the TE21 mode, inside which four scalloped vanes are mounted in an orthogonal array about the axis. These vanes provide the necessary transverse and longitudinal RF electric fields to simultaneously accelerate and focus the beam. The cavity is constructed in four resonantly coupled, 2-m-long copper sections that are water cooled by multiple internal channels to remove RF heating and provide frequency control. Figure 1 shows the coupled RFQ structure mounted in the tuning laboratory. Figure 2 shows the RFQ structure configuration including tapered RF power feeds, vacuumport placement, and section nomenclature. Figure 3 shows a photograph of the completed RFQ assembly in the LEDA tunnel with the injector pulled back. The array of vacuum manifolds, water-cooling manifolds, and RF waveguide almost completely hides the accelerating structure. Design featuresWith output energy of 6.7 MeV the LEDA RFQ [1,8] is the highest energy and highest power RFQ in the world [3,5,[9][10][11]. The beam power is 670 kW when operated with the design-value 100-mA CW proton beam, making it the second-most powerful operating linear accelerator (after the LANSCE 800-MeV linac). Some of its unique design features are as follows:• It is the longest 4-vane RFQ in the world. (8 meters)• It employs resonant coupling [12,13] between the four 2-m-long segments, providing high RF field stability throughout the entire structure length.• It has a significantly larger aperture and gap voltage in the accelerating section than previously designed RFQs at this frequency.• Transverse focusing strength at the RFQ entrance is reduced for easier beam injection. This allows placement of the final focusing solenoid in the low energy beam transport (LEBT) at the optimum distance from the RFQ for input matching.• Transverse focusing at the RFQ exit is reduced to match the focusing strength in the next accelerating structure, the CCDTL [14].• RF power from three 1-MW klystrons is coupled to the RFQ through six waveguide irises. The structure itself combines the RF ...

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Section: Design Featuresmentioning

confidence: 99%

Section: Rfq Descriptionmentioning

confidence: 99%

Operations of the LEDA resonantly coupled RFQ

Young

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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“…This section summarizes the RFQ commissioning results given in [1][2][3][4] and [8][9][10][11][12][13][14][15]. …”

Section: Rfq Commissioningmentioning

confidence: 99%

“…1. Major subsystems are the injector [6], RFQ [1,2,5,10], high-energy beam transport (HEBT) [16], and the beamstop [17]. The injector (Fig.…”

Section: Rfq Configurationmentioning

confidence: 99%

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Low-Energy Demonstration Accelerator (LEDA) test results and plans

Smith

Schneider

Sheffield

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The LEDA 75-keV injector and 6.7-MeV RFQ have been tested with pulsed and cw proton beam currents up to 100 mA. Several LINAC2000 papers give the results of those measurements. A follow-on experiment, to intentionally introduce and measure beam halo on the RFQ output beam, is reported in several papers at this conference (PAC2001). In this paper we summarize the LEDA RFQ commissioning results and the beam-halo measurements and we discuss future test plans for this high-current, high-average-power rf structures test bed.

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Low-Energy Demonstration Accelerator (Leda) Radio-Frequency Quadrupole (Rfq) Results

Cited by 2 publications

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Operations of the LEDA resonantly coupled RFQ

Operations of the LEDA resonantly coupled RFQ

Low-Energy Demonstration Accelerator (LEDA) test results and plans

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