2D Beam Profile Monitors at CPHS of Tsinghua University

International audienceBeam profile is a key parameter for high current proton linac. Compact Pulsed Hadron Source(CPHS) has two type of detectors to monitor beam 2D beam profile: scintillator screen and rotatable multi-wire scanner. A retractable chromium-doped alumina (Chromox) screen is used as scintillator, emitted lights when impacted by proton are captured by a 12 bit CCD camera. Nineteen carbon fibre wires with a diameter of 30 'm, 3 mm separated from each other, are used to measure beam 1D distribution. Projection can be measured at different direction by rotating the multi-wire scanner about beam direction. 2D beam distribution is reconstructed from multiple projections with the help of CT. Different CT algorithms, Algebra Reconstruct Technique (ART) and Maximum Entropy algorithm (MENT), are applied to achieve accurate or quick reconstruction. The preliminary experimental results show the two profile monitors working consistently with each other

Primary Design of DTL for CPHS

The Compact Pulsed Hadron Source (CPHS) has launched at Tsinghua University to develop a neutron source based on a 13-MeV, 50-mA proton linac, consisting of an ECR ion source, LEBT, RFQ, and DTL. The primary design of the DTL for the CPHS is presented in this paper, which includes the dynamics calculation, RF field optimization, and error analysis. This DTL accelerates a 50-mA proton beam from 3 MeV to 13 MeV with 1.2 MW of RF power. The DTL directly follows the RFQ with no Medium-Energy Beam-Transport line (MEBT). Transverse focusing is provided by PMQs housed in the drift tubes. The focusing lattice is designed to continue the transverse phase advance of the RFQ to preserve current independence while avoiding mismatches and parametric resonance

Practice and innovation in the operation and maintenance of HI-13 tandem accelerator for 35 years

The HI-13 tandem accelerator, located at the Beijing Tandem Accelerator National Laboratory, has been in operation for 35 years. To ensure the continued performance of the accelerator, the operation and maintenance team has prioritized focus on various aspects. The operation team conducted research that involved developing key components, cultivating a high-quality operational team, improving the machine time efficiency, and increasing the participation of users outside the China Institute of Atomic Energy (CIAE). The primary emphasis has been on developing key components and upgrading subsystems. These efforts have successfully maintained and improved the accelerator's performance, ensuring its safe and stable operation. Finally, the paper alse discusses the challenges faced by tandem accelerators and presents future development plans

The Compact Pulsed Hadron Source Construction Status

This paper reports the design and construction status, technical challenges, and future perspectives of the proton-linac based Compact Pulsed Hadron Source (CPHS) at the Tsinghua University, Beijing, Chin