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AOS (Baffles & Beam dumps)
keiko.kokeyama - 19:33 Thursday 28 November 2019 (11823) Print this report
HPBD Thermometer is broken

The high power beam dump (HPBD) thermometer is not working cryingcrying I think either the circuit (handmade) or the 18V power supply is broken. 

I connected to the local sensor for now. (Data is logged locally)

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Comments to this report:
kouseki.miyo - 14:30 Tuesday 03 March 2020 (13296) Print this report

I brought the circuit to Mozumi. I will check.

kouseki.miyo - 11:45 Wednesday 01 April 2020 (13924) Print this report

Today, I connected the circuit, but it sparked when i connect the power cable. So I quit to install the circuit. 
After this accident, I asked miyoki-san to check the status of IMC. It was fine, according to the lock monitor display in the control room.

kouseki.miyo - 18:07 Wednesday 01 July 2020 (14658) Print this report

I and Uchiyama-san tried to install this circuit again.

After replacing bad power cabling (klog#14651), we can read temperature at HPBD in IFI.

I changed filterband of AOS_HPBD_IFI_TEMPERATURE according to the caliblation equation in PEM wiki.

Equation is here;

temp = (count*c2v/A + B)/C,

where c2V=40/2**16 [V/count], A=-78*0.001, B=-100,C=0.388.

In the case of the filterbank, these factors should be converted to the Offset ang Gain. These filterband factors are below;

Gain = A*B = 12779.52

Offset = 1/(A*C/c2V) = -0.02017.

After changing the filterbank, I update these changes of VISTS SDF in the case of safe.snap.

Now we can use the temperature of HPBD IFI.smiley

keiko.kokeyama - 11:29 Thursday 02 July 2020 (14666) Print this report

We are testing if the thermometer responds to the beam or not.

Please do not move PRM for 30 mins or so.

IMC TRANS is adjusted to 10W.

keiko.kokeyama - 12:41 Thursday 02 July 2020 (14669) Print this report

The thermoneter doesn't seem to work.

The PRM misalined angle was adjusted by lookg at the IFI camera. By moving BF YAW OFFSET from left to right, shining was confirmed on the both sides. BF YAW OFS was decided to be 14000 whereas IM OPTIC ALIGN was 0 where the IFI camera was darker.

I let them there for more than 20 mins and no temperature change was observed. See the attachments.


 

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keiko.kokeyama - 12:43 Thursday 02 July 2020 (14670) Print this report
Done.
keiko.kokeyama - 19:27 Thursday 02 July 2020 (14678) Print this report

We disconnected the hand made circuit and connected to Chino's commertial circuit.

With this monitor, the temperature never changed with the misaligned PRM. The reflected beam may not be hitting the beam dump properly.

Miyo-kun will investigate more tomorrow morning.

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