---++ Detectors

• cryostat run 20101025
• POLARBEAR wafer KT7 is used
• Reconfigured in x8 (comb A, B, G and H is split in x8 as C and F were configured in x16, though not seen in netanal)

Goals

• Verify performance of bolos from last run in x8

Results

• KT7_x16_x3_netanal.pdf : Network analysis with the correct 22 uH inductors assumed
• PB_KT7_x16_x3_boloIV.pdf: Nulled IV curves.

• x8_vs_x16.pdf: Comparison between Gbar in x16 and x8 configurations

• For noise :
  • Demodulated current increased by 13% for non-idealities
  • Vb and resistance lowered by 15% to account for nuller leakage in bolos.

• Comparison of average thermal conductance on 2 different runs

Bolometer		2010/08/22			2010/08/22
Bolometer	SqCh	Ch	Gbar	SqCh	Ch	Gbar
Ah	SqCh2	Ch1	131	SqCh1	Ch1	136
Ag	SqCh2	Ch9	135	SqCh1	Ch5	139
Af	SqCh2	Ch5	121	SqCh1	Ch3	127
Ae	SqCh2	Ch13	131	SqCh1	Ch7	135
Ad	SqCh2	Ch3	111	SqCh1	Ch2	118
Ac	SqCh2	Ch11	124	SqCh1	Ch6	129
Ab	SqCh2	Ch7	117	SqCh1	Ch4	120
Aa	SqCh2	----		SqCh1	----
Bh	SqCh2	Ch2	160	SqCh2	Ch1	161
Bg	SqCh2	Ch10	152	SqCh2	Ch5	164
Bf	SqCh2	Ch6	121	SqCh2	Ch3	133
Be	SqCh2	Ch14	159	SqCh2	Ch7	165
Bd	SqCh2	Ch4	134	SqCh2	Ch2	147
Bc	SqCh2	Ch12	160	SqCh2	Ch6	169
Bb	SqCh2	Ch8	149	SqCh2	Ch4	160
Ba	SqCh2	Ch16	167	SqCh2	Ch8	175
Ch	SqCh3	Ch1	125	SqCh3	Ch1
Cg	SqCh3	Ch2	114	SqCh3	Ch8
Cf	SqCh3	Ch3	118	SqCh3	Ch5
Ce	SqCh3	Ch4	142	SqCh3	Ch11
Cd	SqCh3	Ch5	139	SqCh3	Ch3
Cc	SqCh3	Ch6	----	SqCh3	Ch9
Cb	SqCh3	Ch7	----	SqCh3	Ch7
Ca	SqCh3	Ch8	115	SqCh3	Ch13
Fh	SqCh6	Ch1	115	SqCh3	Ch2
Fg	SqCh6	Ch2		SqCh3	Ch10
Ff	SqCh6	Ch3	150	SqCh3	Ch6
Fe	SqCh6	Ch4	125	SqCh3	Ch12
Fd	SqCh6	Ch5	130	SqCh3	Ch4
Fc	SqCh6	Ch6		SqCh3	----
Fb	SqCh6	Ch7		SqCh3	----
Fa	SqCh6	Ch8		SqCh3	Ch14
Gh	SqCh8	----		SqCh7	----
Gg	SqCh8	----		SqCh7	----
Gf	SqCh8	Ch3	147	SqCh7	Ch3	159
Ge	SqCh8	----		SqCh7	----
Gd	SqCh8	----		SqCh7	----
Gc	SqCh8	Ch5	154	SqCh7	Ch4	155
Gb	SqCh8	Ch11	170	SqCh7	Ch8	182
Ga	SqCh8	Ch2	153	SqCh7	Ch2	166
Hh	SqCh8	----		SqCh8	----
Hg	SqCh8	Ch8	130	SqCh8	Ch5	138
Hf	SqCh8	Ch6	132	SqCh8	Ch2	143
He	SqCh8	Ch10	146	SqCh8	Ch7	160
Hd	SqCh8	Ch4	131	SqCh8	Ch1	144
Hc	SqCh8	Ch9	154	SqCh8	Ch6	152
Hb	SqCh8	Ch7	139	SqCh8	Ch4	151
Ha	SqCh8	Ch12	152	SqCh8	Ch8	160

• Bolometer noise from 2010/11/09

state	b153-w0 (x7)	b153-w1 (x8)	b154-w2 (x5)	b154-w3 (x7)	pdf
SQUID noise 10K					PB_KT7_x16_20101109-M1.pdf
overbiased (Tbath>Tc)					PB_KT7_x16_20101109-M2.pdf
overbiased (Tbath<Tc)					PB_KT7_x16_20101109-M2.pdf
transition (90%)					PB_KT7_x16_20101109-M4.pdf
transition (80%)					PB_KT7_x16_20101109-M5.pdf
transition (70%)					PB_KT7_x16_20101109-M6.pdf

• Responsitivity * Vb vs position in transition
  • Shows that there is a correlation between measured responsitivity and the position in transition.
  • It means we need to be careful when comparing different results so we correct for the same positions.
  • 

• tau_etf vs position in transition
  • Shows that there is a correlation between measured tau_etf and the position in transition.
  • It means we need to be careful when comparing different results so we correct for the same positions.
  • 

• Sanity check between x8 and x16 configuration for responsitivity and electro-thermal feedback
  • x8 and x18 tau_etf and Si are strongly correlated. Since the correction is crude, the error is expected to be big.
  • 

• tau_etf vs Responsitivity * Vb
  • Responsitivity corrected to the deepnes in transition of the tau_etf measurement,
  • Strong correlation between the two. Expected from the tau_etf and Si*Vb vs position in transition plots.
  • 

• Responsitivity * Vb distribution :
  • Each Si is corrected to be at 80% of R turnaround.
  • Expect 1 for Si if responsitivity is 1/Vb
  • get (1.38 +- 0.05 ) (note, the sqrt(2) factor Hannes has in his thesis is corrected for here, loop gain not accounted in equation)
  • 

• tau_etf vs noise ratio of 70% in transition (2010/09/09) :
  • The time constant has been corrected to be at the same fraction of R turnaround as when the noise measurement was made.
  • No correlation.
  • 

• Responsitivity * Vb vs noise ratio of 70% in transition (2010/09/09) :
  • The responsitivity * Vb has been corrected to be at the same fraction of R turnaround as when the noise measurement was made.
  • No correlation.
  • 

• Responsitivity * Vb & tau_etf vs bias frequency
  • All values corrected to 80% of R turnaround
  • No correlation.
  • 

-- FrancoisAubin - 10 Nov 2010

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This topic: BolometerTesting > WebHome > PolarBear > 2009_PB_BoloKT7_x16_3 Topic revision: r10 - 2011-01-19 - FrancoisAubin

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