# Item

ITEM ACTIONSEXPORT

Released

Thesis

#### Temperature stabilization of the ultra-stable voltage source StaReP for the Alphatrap experiment

##### External Resource

No external resources are shared

##### Fulltext (restricted access)

There are currently no full texts shared for your IP range.

##### Fulltext (public)

Bc_Hübner.pdf

(Any fulltext), 2MB

##### Supplementary Material (public)

There is no public supplementary material available

##### Citation

Hübner, M. (2019). Temperature stabilization of the ultra-stable voltage source StaReP for the Alphatrap experiment. Bachelor Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-0004-F447-9

##### Abstract

The goal of this bachelor thesis is setting up a temperature stabilization of

the ultra-stable voltage source StaReP - Stable Reference for Penning Trap

Experiments - for the Alphatrap experiment. The Alphatrap experiment

is located at the Max Planck Institute for Nuclear Physics in Heidelberg and

aims to determine the g-factor of bound electrons with high precision to test

quantum electrodynamics in very strong fields. A crucial point for the highprecision

measurements is the determination of the ions’ axial frequency,

for the reason that the axial frequency is necessary to determine one of the

frequencies needed to calculate the g-factor. The axial frequency stability in

turn depends on the stability of the voltage for the Penning-trap electrodes,

which are supplied by the StaReP. To avoid that the temperature stability

of the StaReP is limiting the achievable precision, a temperature stability

better than 10 mK on a time scale of one measurement cycle - in order of

10 minutes - is desirable. Besides that the temperature stabilization should

enable a rapid temperature stabilization, due to the required refilling of the

cryostats. For the fillings the room has to be entered every three to four

days, which causes large temperature fluctuations. A desirable time scale

for the stabilization is given by the time the cryostates need to get into a

steady state due to mechanical expansion and shrinking of the frame. This is

observed to be in the range of one to two hours, the design and comissioning of

this stabilization with a PI-regulator is presented in the following bachelor’s

thesis.

the ultra-stable voltage source StaReP - Stable Reference for Penning Trap

Experiments - for the Alphatrap experiment. The Alphatrap experiment

is located at the Max Planck Institute for Nuclear Physics in Heidelberg and

aims to determine the g-factor of bound electrons with high precision to test

quantum electrodynamics in very strong fields. A crucial point for the highprecision

measurements is the determination of the ions’ axial frequency,

for the reason that the axial frequency is necessary to determine one of the

frequencies needed to calculate the g-factor. The axial frequency stability in

turn depends on the stability of the voltage for the Penning-trap electrodes,

which are supplied by the StaReP. To avoid that the temperature stability

of the StaReP is limiting the achievable precision, a temperature stability

better than 10 mK on a time scale of one measurement cycle - in order of

10 minutes - is desirable. Besides that the temperature stabilization should

enable a rapid temperature stabilization, due to the required refilling of the

cryostats. For the fillings the room has to be entered every three to four

days, which causes large temperature fluctuations. A desirable time scale

for the stabilization is given by the time the cryostates need to get into a

steady state due to mechanical expansion and shrinking of the frame. This is

observed to be in the range of one to two hours, the design and comissioning of

this stabilization with a PI-regulator is presented in the following bachelor’s

thesis.