Extra transmittance term

I think there is an additional issue with the sensitivity and integration time equations, having an extra np.exp(self.tau_atm) term. The corresponding lines are reported below.

AtLAST_sensitivity_calculator/atlast_sc/calculator.py

Lines 275 to 279 in f2128fa

    
           sensitivity = \ 
        
               (self.sefd / 
        
                   (self.eta_s * np.sqrt(self.n_pol * self.bandwidth * t_int)) 
        
                * np.exp(self.tau_atm) 
        
                )

AtLAST_sensitivity_calculator/atlast_sc/calculator.py

Lines 310 to 312 in f2128fa

    
           t_int = ((self.sefd * np.exp(self.tau_atm)) 
        
                    / (sensitivity * self.eta_s)) ** 2 \ 
        
               / (self.n_pol * self.bandwidth)

Respectively, these should be

sensitivity = self.sefd / self.eta_s / np.sqrt(self.n_pol * self.bandwidth * t_int)

and

t_int = ((self.sefd / sensitivity / self.eta_s) ** 2) / self.n_pol / self.bandwidth

That's interesting. I'm wondering if there was maybe an earlier version of the calcuations that didn't include the transmission term in the T_sys calculation. I've removed the term from each calculation (it's in the wrong place in the t_int calculation anyway).

The transmittance term has now been removed from the integration time and sensitivty calculations.

	sensitivity = \
	(self.sefd /
	(self.eta_s * np.sqrt(self.n_pol * self.bandwidth * t_int))
	* np.exp(self.tau_atm)
	)

	t_int = ((self.sefd * np.exp(self.tau_atm))
	/ (sensitivity * self.eta_s)) ** 2 \
	/ (self.n_pol * self.bandwidth)