The post-accelerator for the ISAC radioactive beam facility combines a 35.4 MHz RFQ and a variable energy 106 MHz DTL. The ISAC DTL is designed to accelerate ions with 3 /spl les/ A/q /spl les/ 6 to energies fully variable from 0.153 to 1.53 MeV/u. The unique separated function design allows efficient room-temperature acceleration and full energy variability with no degradation in beam quality. The first stable beams were accelerated in the DTL in Dec. 2000 with full commissioning in the first months of 2001. Test results with stable beams will be reported and compared with beam simulation results. In addition the initial operating experience with stable beam delivery is reported.

/pdf/beam-commissioning-and-first-operation-of-the-isac-dtl-at-3u668cm0b2.pdf

Beam commissioning and first operation of the ISAC DTL at TRIUMF

The post-accelerator for ISAC includes a 35.4 MHz RF quadrupole (RFQ) to accelerate beams of A/q /spl les/ 30 from 2 keV/u to 153keV/u and a post-stripper, 106MHz variable energy drift tube linac (DTL) to accelerate ions of 3 /spl les/ A/q /spl les/ 6 to a final energy from 0.153 to 1.53 MeV/u. Most recently the DTL has been installed with first acceleration to full energy achieved in Dec. 2000. The design concept, present status and early operating experience of the ISAC linear accelerator complex is summarized. TRIUMF has also received funding through to 2005 to proceed with an extension to the ISAC facility, ISAC-II, to permit acceleration of radioactive ion beams up to energies of at least 6.5 MeV/u for masses up to 150. The accelerator design and present status of the project is presented.

Completion and operations of ISAC-I and extension to ISAC-II

A separated function, variable energy, drift tube linac (DTL) operating in cw mode at 105 MHz is being built for the ISAC radioactive beam facility at TRIUMF. Included in the design are three buncher cavities installed in the first, second and third drift spaces between the five IH tanks. The main requirements of the bunchers are: cw mode, high effective voltage (up to 0.32 MV), large velocity acceptance (1.8-4.1%). The first DTL buncher has been developed at INR and is being tested at TRIUMF. It is a triple gap split-ring RF structure operating at 105 MHz. Signal level measurements give a Q-value of 4300 which is 74% of MAFIA simulation predictions and a resonant frequency within 0.6% of the calculated value. With cooling water flow of 20 l/min the mechanical vibrations were measured to be of the order of 1 /spl mu/m. Although the design parameters are 56 kV gap voltage and 8 kW nominal power, we demonstrated 85 kV and 16 kW respectively with stable operation.

High power test of the ISAC triple gap buncher operating in CW mode

A set of triple gap split-ring 106.08 MHz bunchers (bunch-rotator for MEBT and three DTL bunchers) was designed, fabricated and tested for the ISAC project at TRIUMF. These four devices operate at low /spl beta/ (1.8%, 2.3%, 2.7% and 3.3%) and deliver the peak effective voltages in cw mode of 0.07, 0.19, 0.26 and 0.32 MV respectively. The shape of drift tubes was optimized to have a maximum transit time factor with the fixed value of electric field at the surface (1.5 value of Kilpatrick's criterion). 3D simulations were done to adjust optimized drift tubes with split-rings to have an operating frequency and to unify dimensions of the cavities. The bunchers were fabricated in INR and successfully tested at full power in TRIUMF. Some features of the design and results of the tests are reported in this paper.

/pdf/development-fabrication-and-test-of-triple-gap-split-ring-2m0s68cvup.pdf

Development, fabrication and test of triple gap split-ring bunchers for the TRIUMF ISAC facility

Since 1998 the TRIUMF H ‐ cyclotron has been equipped with a new 500 MeV proton extraction beam line dedicated to the new ISAC facility (Isotope Separator and ACcelerator). Up to 40 μA have so far been delivered to the ISAC target system for routine radioactive beam production. 100 μA (the ISAC primary beam design intensity) were also delivered for a specific target test. Initial ISAC experiments were performed with singly charged radioactive ions at target/ion-source energies (E ≤ 60 keV/u). A cw linac based on a 35.4 MHz 8 m long RFQ (A/q ≤ 30) followed by a 106 MHz post-stripper DTL (3 ≤ A/q ≤ 6) has recently been commissioned and now delivers radioactive ion beams to experiments at energies between 0.153 and 1.53 MeV/u (A ≤ 30). Recently, TRIUMF was also funded to proceed with the construction of the ISAC-II expansion, which will accelerate beams of A ≤ 150 up to energies of at least 6.5 MeV/u, above the Coulomb barrier. Recent milestones, initial operational experience with ISAC-I and first results from ISAC-II prototyping are reported.

/pdf/completion-of-the-isac-i-accelerator-for-radioactive-ions-1hyqpw6x5y.pdf

Completion of the isac-i accelerator for radioactive ions and extension to isac-ii*

In the ISAC radioactive ion beam facility at TRIUMF, a variable energy drift tube linac: (DTL) is used to accelerate ions with a charge to mass ratio /spl ges/1/6 from 0.153 MeV/u to 1.53 MeV/u. The accelerating tanks are five independent interdigital H type rf structures with high shunt impedances. The three bunchers are triple gap split-ring resonators placed between the first four accelerating tanks. Each structure is equipped with fine tuners to compensate for frequency drift during operation. Coarse tuners are installed in the DTL cavities to bring their resonant frequencies within the tuning range of the fine tuners. Except for the loop size, the same rf power couplers have been used in all the structures. All these structures operate at 106.08 MHz and have been tested at power. Signal level measurements have been done to characterize their rf properties. Drift tube gap voltages were measured with x-ray field emissions and compared with voltages estimated from input power and shunt impedance. RF power losses in the DTL tank walls were higher than calculated and hence additional cooling was provided. The results of the signal and power measurements are summarized in this paper.

RF measurement summary of ISAC DLT tanks and DTL bunchers

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RF measurement summary of ISAC DLT tanks and DTL bunchers