Abstract
A significant part of the experimental program at Facility for Antiproton and Ion Research (FAIR) is dedicated to pbar physics requiring a high number of cooled pbars per hour. The primary proton beam has to be provided by a 70 MeV proton linac followed by two synchrotrons. The new FAIR proton linac will deliver a pulsed proton beam of up to 35 mA of $36\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ duration at a repetition rate of 4 Hz (maximum). The GSI heavy ion linac (UNILAC) is able to deliver world record uranium beam intensities for injection into the synchrotrons, but it is not suitable for FAIR relevant proton beam operation. In an advanced machine investigation program it could be shown that the UNILAC is able to provide for sufficient high intensities of ${\mathrm{CH}}_{3}$ beam, cracked (and stripped) in a supersonic nitrogen gas jet into protons and carbon ions. This advanced operational approach will result in up to 3 mA of proton intensity at a maximum beam energy of 20 MeV, $100\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ pulse duration and a repetition rate of up to 2.7 Hz delivered to the synchrotron SIS18. Recent linac beam measurements will be presented, showing that the UNILAC is able to serve as a proton FAIR injector for the first time, while the performance is limited to 25% of the FAIR requirements.
Highlights
Besides two ion source terminals and a low energy beam transport system (LEBT) the High Current Injector (HSI) [1] of the UNILAC (Fig. 1) comprises a 36 MHz combination of Interdigital H-structure and Radio Frequency Quadrupole (IH-RFQ) (2.2 keV=u up to 120 keV=u) and an Interdigital H-structure Drift Tube Linac (IH-DTL), comprised of two separate tanks, accelerating the beam up to the final HSI energy of 1.4 MeV=u
CH3 beam, cracked in a supersonic nitrogen gas jet into protons and carbon ions. This advanced operational approach will result in up to 3 mA of proton intensity at a maximum beam energy of 20 MeV, 100 μs pulse duration and a repetition rate of up to 2.7 Hz delivered to the synchrotron SIS18
Recent linac beam measurements will be presented, showing that the UNILAC is able to serve as a proton FAIR injector for the first time, while the performance is limited to 25% of the FAIR requirements
Summary
Besides two ion source terminals and a low energy beam transport system (LEBT) the High Current Injector (HSI) [1] of the UNILAC (Fig. 1) comprises a 36 MHz combination of Interdigital H-structure and Radio Frequency Quadrupole (IH-RFQ) (2.2 keV=u up to 120 keV=u) and an Interdigital H-structure Drift Tube Linac (IH-DTL), comprised of two separate tanks, accelerating the beam up to the final HSI energy of 1.4 MeV=u. The new FAIR proton linac [3] has to provide the high intensity primary proton beam for the production of antiprotons. It will deliver a 70 MeV beam to the SIS18 with a repetition rate of 4 Hz. The room temperature linac will be located north of the existing UNILAC complex.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
