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The specific heat for an ideal Bose gas confined in semi-infinitemultifilament cables is analyzed. We start with a Bose gas inside asemi-infinite tube of impenetrable walls and finite rectangular cross section.The internal filament structure is created by applying to the gas two, mutuallyperpendicular, Kronig-Penney delta-potentials along the tube cross section,while particles are free to move perpendicular to the cross section. The energyspectrum accessible to the particles is obtained and introduced into the grandpotential to calculate the specific heat of the system as a function oftemperature for different values of the periodic structure parameters such as:the cross section area, the wall impenetrability and the number of filaments.The specific heat as a function of temperature shows at least two maxima andone minimum. The main difference with respect to the infinite case is that thepeak associated with the BE condensation becomes a smoothed maximum or in otherwords, there is not a jump in the specific heat derivative, whose temperatureno longer represents a critical point.

Finite size effect on the specific heat of a Bose gas in multifilament cables