Abstract
The field emission electron currents from the main superconducting cavities (Cavities #3 and #4) of compact ERL at KEK, Japan, were estimated indirectly from photon dose rates measured around the cavities and on the roof of the compact ERL room. The field emission electron currents estimated from the photon dose rates measured around the cavities are in good agreement with those on the roof of the compact ERL room. The field emission electron currents increased steeply with the applied voltage. The field emission electron currents corresponding to the applied voltages were different between Cavity #3 and Cavity #4. We found that the field emission electron current exceeded 1 μA at 13.5 MV for Cavity #3 and at 15.5 MV for Cavity #4. This result was used in considering unexpected loss of field emission electrons.
Highlights
The compact Energy Recovery Linac— an electron accelerator with a maximum energy of 26 MeV—has been under development at the compact ERL room at KEK, Tsukuba, Japan [1]
Field emission electron current exceeding 1 μA was observed at 13.5 MV for Cavity #3 and at 15.5 MV for Cavity #4
The field emission electron currents from the main superconducting cavities of compact ERL at KEK were estimated indirectly from photon dose rates measured around the cavities and on the roof of the compact ERL room
Summary
The compact Energy Recovery Linac (compact ERL)— an electron accelerator with a maximum energy of 26 MeV—has been under development at the compact ERL room at KEK, Tsukuba, Japan [1]. The accelerated electrons are transferred to the recirculating loop and accelerated to a maximum energy of 26 MeV by a set of main superconducting cavities (Cavities #3 and #4) [2]. The 26 MeV electrons are transported round the recirculating loop until they reach the main superconducting cavities again. In the compact ERL, the main superconducting cavities play an important role for acceleration and deceleration of electrons. When a voltage is applied to the main superconducting cavities, field emission electrons are generated inside those cavities [3]. We indirectly measured the field emission electron current from each main superconducting cavity. The field emission electron currents were obtained through measurements and simulations of secondary radiation photons and subsequently compared. The secondary photons were produced by bombarding stainless steel (SUS) blind flanges, used for closing both ends of the superconducting cavities, with field emission electrons
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