title: An in situ trap capacitance measurement and ion-trapping detection scheme for a Penning ion trap facility.
abstract: This paper presents the design and implementation of an in situ measurement setup for the capacitance of a five electrode Penning ion trap (PIT) facility at room temperature. For implementing a high Q resonant circuit for the detection of trapped electrons/ions in a PIT, the value of the capacitance of the trap assembly is of prime importance. A tunable Colpitts oscillator followed by a unity gain buffer and a low pass filter is designed and successfully implemented for a two-fold purpose: in situ measurement of the trap capacitance when the electric and magnetic fields are turned off and also providing RF power at the desired frequency to the PIT for exciting the trapped ions and subsequent detection. The setup is tested for the in situ measurement of trap capacitance at room temperature and the results are found to comply with those obtained from measurements using a high Q parallel resonant circuit setup driven by a standard RF signal generator. The Colpitts oscillator is also tested successfully for supplying RF power to the high Q resonant circuit, which is required for the detection of trapped electrons/ions.
authors.affiliation: Variable Energy Cyclotron Centre, HBNI, 1/AF Bidhannagar, Kolkata 700064, India.
authors.forename: Ashif
authors.initials: A
authors.lastname: Reza
authors.affiliation: Jadavpur University, Sector III, Salt Lake City, Kolkata 700098, India.
authors.forename: Kumardeb
authors.identifier: 0000000329722085
authors.initials: K
authors.lastname: Banerjee
authors.affiliation: Variable Energy Cyclotron Centre, HBNI, 1/AF Bidhannagar, Kolkata 700064, India.
authors.forename: Parnika
authors.initials: P
authors.lastname: Das
authors.affiliation: Jadavpur University, Sector III, Salt Lake City, Kolkata 700098, India.
authors.forename: Kalyankumar
authors.initials: K
authors.lastname: Ray
authors.affiliation: Jadavpur University, Sector III, Salt Lake City, Kolkata 700098, India.
authors.forename: Subhankar
authors.initials: S
authors.lastname: Bandyopadhyay
authors.affiliation: Jadavpur University, Sector III, Salt Lake City, Kolkata 700098, India.
authors.forename: Bivas
authors.initials: B
authors.lastname: Dam