The high power beam dump (HPBD) thermometer is not working 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)
The high power beam dump (HPBD) thermometer is not working 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)
I brought the circuit to Mozumi. I will check.
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.
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.
Now we can use the temperature of HPBD IFI.
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.
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.
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.