Successful acceleration of a 125 mA deuteron beam @5 MeV in LIPAc!!!
24 July 2019
The deuteron (D+) beam commissioning has been ongoing since two months, and we achieved a 125 mA beam acceleration by the Radio Frequency Quadrupole (RFQ), and transported to the Low Power Beam Dump (LPBD) on the 24th of July, 2019. The data was obtained in pulsed mode operation of ion plasma source with 1 ms length and 1 Hz repetition rate.
The beam current range was varying from 50 to 140 mA at the entrance of RFQ, and 90% transmission through the RFQ was measured for a maximum current of 125 mA (measurement taken at the end of the beam pulse shape) and for a rated RFQ cavity voltage of 132 kV.
The detail of the accelerated beam characteristics is under investigation and the commissioning phase is still ongoing.
This significant outcome demonstrates that all the components of the LIPAc accelerator in the phase B configuration meet the design requirements. This achievement gives us confidence for the future and the next step toward continuous wave operation at 5 MeV with its high energy beam transport line.
Status Proton Beam Commissioning @2.5 MeV (Phase B1)
25 May 2019
The proton characterization at 2.5 MeV was completed on April 30, 2019 (Phase B1). During this phase, with an extracted current of 88 mA and 300 µs maximum pulse length from the injector, a maximum current of 57 mA was accelerated in the Radio Frequency Quadrupole (RFQ) with a transmission of 93 % through RFQ and beam transport line up to the Low Power Beam Dump (LPBD).
The RFQ was conditioned for proton level operation, which requires a field of about 70 kV to accelerate the protons. In the case of the deuteron operation (next phase B2, and nominal condition of the machine), the cavity needs to be conditioned to reach a maximum field of 142 kV. The conditioning is still on-going to reach that field level with pulses up to 300 µs.
The Beam Instrumentation has also demonstrated to be operational. Further improvements are ongoing which should ease beam operation and allow data analysis with comparison to beam dynamics models.
As an example, the above figure on the left shows the measurement of beam profiles, providing the shape of the beam. On the right, the beam position in space is monitored.
Project Committee #23
18 & 19 March 2019
The 23nd Project Committee (PC#23) was held at Rokkasho IFERC Site on March 18th and 19th, during which an update of the project status was presented as well as the outlook from 2019 onward.
The main topics discussed were the progress since the last PC#22 with the achievement of the annual maintenance campaign, the completion the HEBT and Beam Dump installation in the accelerator line and the resumption of the Beam Operation with proton beam and the first deuteron injection into the RFQ. The preparatory work for the assembly of the Cryomodule in the clean room at Rokkasho was also presented.
The PC members in the LIPAc Control Room participating to the beam operation
3 weeks after resuming the operation….
The maintenance period was completed early 2019 and the acceleration of proton beams up to 2.5 MeV was resumed on 20 February. A transmission of 95% through the RFQ was achieved with an input beam current of 7 mA and 0.3 ms pulse length. By using such a beam, the phase tuning of the two bunchers installed in the MEBT was performed successfully. The basic beam diagnostics, beam current monitors (ACCT) and beam position monitors (BPM), were used regularly for beam commissioning, and the beam profile measurement was started by using a non-interceptive device (Fluorescence Profile Monitors) and an interceptive one (Secondary electron emission grid monitors). The latter one is also used to measure the beam emittance with a slit insertion.
IFMIF/EVEDA – Engineering and validation of equipment in progress
First LIPAc Commissioning and Beam Operation Workshop at Rokkasho!!!
After completing the first beam operation stage, and while profiting ofthe stop of the machine for the scheduled maintenance, the first LIPAcCommissioning and Beam Operation workshop was organized at Rokkasho site. [read more]
Visit of the French Ambassador at Rokkasho on 12/11/2018
On November 12th, 2018, we were honored by the visit of the French Ambassador, his excellency Laurent Pic, and his delegation at Rokkasho. We were given the chance to present the activities performed at the IFERC site [read more]
Project Committee #22
The 22nd Project Committee was held at Rokkasho IFERC Site on October 15th and 16th, during which an update of the project was presented as well as the outlook from 2019 onward [read more]
On October 16th, 2018 the transfer of ownership of Beam Instrumentation, Medium Energy Beam Transport and Radio Frequency Quadrupole [read more]
First proton beam injected into the RFQ on 13 June 2018!!!
As a major milestone towards the validation of the IFMIF accelerator design, the first beam has been injected into the RFQ at the LIPAc (Linear IFMIF Prototype Accelerator) at Rokkasho on 13 June 2018.
After some optimization, on Friday 15 June 2018 more than 80% of transmission in the RFQ was achieved.
This first campaign consisting of the full characterization of the proton beam at low duty cycle, followed by an increase of the beam current up to 65mA, will last almost 8 weeks, and will be followed by the deuteron beam operation. Besides this important milestone being reached, LIPAc project will have to face other important challenges before the start of the next phase with the assembly of the SRF Linac at Rokkasho site and the installation of the HEBT/BD required to reach the final targeted 9MeV.
Congratulations to the LIPAc Operation Team!!
Further check the dedicated newsline.